root / lib / utils.py @ 682f7601
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1 | 2f31098c | Iustin Pop | #
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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | a8083063 | Iustin Pop | # Copyright (C) 2006, 2007 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | 58885d79 | Iustin Pop | """Ganeti utility module.
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23 | 58885d79 | Iustin Pop |
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24 | 58885d79 | Iustin Pop | This module holds functions that can be used in both daemons (all) and
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25 | 58885d79 | Iustin Pop | the command line scripts.
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26 | 899d2a81 | Michael Hanselmann |
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27 | a8083063 | Iustin Pop | """
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28 | a8083063 | Iustin Pop | |
29 | a8083063 | Iustin Pop | |
30 | a8083063 | Iustin Pop | import os |
31 | a8083063 | Iustin Pop | import time |
32 | 113b55aa | Iustin Pop | import subprocess |
33 | a8083063 | Iustin Pop | import re |
34 | a8083063 | Iustin Pop | import socket |
35 | a8083063 | Iustin Pop | import tempfile |
36 | a8083063 | Iustin Pop | import shutil |
37 | 4ca1b175 | Alexander Schreiber | import errno |
38 | 2f8b60b3 | Iustin Pop | import pwd |
39 | 78feb6fb | Guido Trotter | import itertools |
40 | 9c233417 | Iustin Pop | import select |
41 | 9c233417 | Iustin Pop | import fcntl |
42 | 8f765069 | Iustin Pop | import resource |
43 | bb698c1f | Iustin Pop | import logging |
44 | 551b6283 | Iustin Pop | import logging.handlers |
45 | de499029 | Michael Hanselmann | import signal |
46 | 27e46076 | Michael Hanselmann | import datetime |
47 | 27e46076 | Michael Hanselmann | import calendar |
48 | 339be5a8 | Michael Hanselmann | import collections |
49 | f93f2016 | Michael Hanselmann | import struct |
50 | f93f2016 | Michael Hanselmann | import IN |
51 | 9c233417 | Iustin Pop | |
52 | 9c233417 | Iustin Pop | from cStringIO import StringIO |
53 | a8083063 | Iustin Pop | |
54 | 7ffe8fba | Carlos Valiente | try:
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55 | 7ffe8fba | Carlos Valiente | from hashlib import sha1 |
56 | 7ffe8fba | Carlos Valiente | except ImportError: |
57 | 7ffe8fba | Carlos Valiente | import sha |
58 | 7ffe8fba | Carlos Valiente | sha1 = sha.new |
59 | 7ffe8fba | Carlos Valiente | |
60 | a8083063 | Iustin Pop | from ganeti import errors |
61 | 3aecd2c7 | Iustin Pop | from ganeti import constants |
62 | a8083063 | Iustin Pop | |
63 | 16abfbc2 | Alexander Schreiber | |
64 | a8083063 | Iustin Pop | _locksheld = [] |
65 | a8083063 | Iustin Pop | _re_shell_unquoted = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
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66 | a8083063 | Iustin Pop | |
67 | e67bd559 | Michael Hanselmann | debug_locks = False
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68 | 58885d79 | Iustin Pop | |
69 | 58885d79 | Iustin Pop | #: when set to True, L{RunCmd} is disabled
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70 | b74159ee | Iustin Pop | no_fork = False
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71 | f362096f | Iustin Pop | |
72 | 13998ef2 | Michael Hanselmann | _RANDOM_UUID_FILE = "/proc/sys/kernel/random/uuid"
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73 | 13998ef2 | Michael Hanselmann | |
74 | f93f2016 | Michael Hanselmann | # Structure definition for getsockopt(SOL_SOCKET, SO_PEERCRED, ...):
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75 | f93f2016 | Michael Hanselmann | # struct ucred { pid_t pid; uid_t uid; gid_t gid; };
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76 | f93f2016 | Michael Hanselmann | #
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77 | f93f2016 | Michael Hanselmann | # The GNU C Library defines gid_t and uid_t to be "unsigned int" and
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78 | f93f2016 | Michael Hanselmann | # pid_t to "int".
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79 | f93f2016 | Michael Hanselmann | #
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80 | f93f2016 | Michael Hanselmann | # IEEE Std 1003.1-2008:
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81 | f93f2016 | Michael Hanselmann | # "nlink_t, uid_t, gid_t, and id_t shall be integer types"
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82 | f93f2016 | Michael Hanselmann | # "blksize_t, pid_t, and ssize_t shall be signed integer types"
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83 | f93f2016 | Michael Hanselmann | _STRUCT_UCRED = "iII"
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84 | f93f2016 | Michael Hanselmann | _STRUCT_UCRED_SIZE = struct.calcsize(_STRUCT_UCRED) |
85 | f93f2016 | Michael Hanselmann | |
86 | 7c0d6283 | Michael Hanselmann | |
87 | a8083063 | Iustin Pop | class RunResult(object): |
88 | 58885d79 | Iustin Pop | """Holds the result of running external programs.
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89 | 58885d79 | Iustin Pop |
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90 | 58885d79 | Iustin Pop | @type exit_code: int
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91 | 58885d79 | Iustin Pop | @ivar exit_code: the exit code of the program, or None (if the program
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92 | 58885d79 | Iustin Pop | didn't exit())
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93 | 58885d79 | Iustin Pop | @type signal: int or None
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94 | 58885d79 | Iustin Pop | @ivar signal: the signal that caused the program to finish, or None
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95 | 58885d79 | Iustin Pop | (if the program wasn't terminated by a signal)
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96 | 58885d79 | Iustin Pop | @type stdout: str
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97 | 58885d79 | Iustin Pop | @ivar stdout: the standard output of the program
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98 | 58885d79 | Iustin Pop | @type stderr: str
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99 | 58885d79 | Iustin Pop | @ivar stderr: the standard error of the program
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100 | 58885d79 | Iustin Pop | @type failed: boolean
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101 | 58885d79 | Iustin Pop | @ivar failed: True in case the program was
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102 | 58885d79 | Iustin Pop | terminated by a signal or exited with a non-zero exit code
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103 | 58885d79 | Iustin Pop | @ivar fail_reason: a string detailing the termination reason
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104 | a8083063 | Iustin Pop |
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105 | a8083063 | Iustin Pop | """
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106 | a8083063 | Iustin Pop | __slots__ = ["exit_code", "signal", "stdout", "stderr", |
107 | a8083063 | Iustin Pop | "failed", "fail_reason", "cmd"] |
108 | a8083063 | Iustin Pop | |
109 | a8083063 | Iustin Pop | |
110 | 38206f3c | Iustin Pop | def __init__(self, exit_code, signal_, stdout, stderr, cmd): |
111 | a8083063 | Iustin Pop | self.cmd = cmd
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112 | a8083063 | Iustin Pop | self.exit_code = exit_code
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113 | 38206f3c | Iustin Pop | self.signal = signal_
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114 | a8083063 | Iustin Pop | self.stdout = stdout
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115 | a8083063 | Iustin Pop | self.stderr = stderr
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116 | 38206f3c | Iustin Pop | self.failed = (signal_ is not None or exit_code != 0) |
117 | a8083063 | Iustin Pop | |
118 | a8083063 | Iustin Pop | if self.signal is not None: |
119 | a8083063 | Iustin Pop | self.fail_reason = "terminated by signal %s" % self.signal |
120 | a8083063 | Iustin Pop | elif self.exit_code is not None: |
121 | a8083063 | Iustin Pop | self.fail_reason = "exited with exit code %s" % self.exit_code |
122 | a8083063 | Iustin Pop | else:
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123 | a8083063 | Iustin Pop | self.fail_reason = "unable to determine termination reason" |
124 | a8083063 | Iustin Pop | |
125 | bb698c1f | Iustin Pop | if self.failed: |
126 | bb698c1f | Iustin Pop | logging.debug("Command '%s' failed (%s); output: %s",
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127 | bb698c1f | Iustin Pop | self.cmd, self.fail_reason, self.output) |
128 | f362096f | Iustin Pop | |
129 | a8083063 | Iustin Pop | def _GetOutput(self): |
130 | a8083063 | Iustin Pop | """Returns the combined stdout and stderr for easier usage.
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131 | a8083063 | Iustin Pop |
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132 | a8083063 | Iustin Pop | """
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133 | a8083063 | Iustin Pop | return self.stdout + self.stderr |
134 | a8083063 | Iustin Pop | |
135 | a8083063 | Iustin Pop | output = property(_GetOutput, None, None, "Return full output") |
136 | a8083063 | Iustin Pop | |
137 | a8083063 | Iustin Pop | |
138 | bf4daac9 | Guido Trotter | def RunCmd(cmd, env=None, output=None, cwd='/', reset_env=False): |
139 | a8083063 | Iustin Pop | """Execute a (shell) command.
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140 | a8083063 | Iustin Pop |
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141 | a8083063 | Iustin Pop | The command should not read from its standard input, as it will be
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142 | a8083063 | Iustin Pop | closed.
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143 | a8083063 | Iustin Pop |
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144 | bf4daac9 | Guido Trotter | @type cmd: string or list
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145 | 36117c2b | Iustin Pop | @param cmd: Command to run
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146 | 2557ff82 | Guido Trotter | @type env: dict
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147 | 58885d79 | Iustin Pop | @param env: Additional environment
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148 | 36117c2b | Iustin Pop | @type output: str
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149 | 58885d79 | Iustin Pop | @param output: if desired, the output of the command can be
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150 | 36117c2b | Iustin Pop | saved in a file instead of the RunResult instance; this
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151 | 36117c2b | Iustin Pop | parameter denotes the file name (if not None)
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152 | 8797df43 | Iustin Pop | @type cwd: string
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153 | 8797df43 | Iustin Pop | @param cwd: if specified, will be used as the working
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154 | 8797df43 | Iustin Pop | directory for the command; the default will be /
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155 | bf4daac9 | Guido Trotter | @type reset_env: boolean
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156 | bf4daac9 | Guido Trotter | @param reset_env: whether to reset or keep the default os environment
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157 | 36117c2b | Iustin Pop | @rtype: L{RunResult}
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158 | 58885d79 | Iustin Pop | @return: RunResult instance
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159 | 5bbd3f7f | Michael Hanselmann | @raise errors.ProgrammerError: if we call this when forks are disabled
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160 | a8083063 | Iustin Pop |
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161 | a8083063 | Iustin Pop | """
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162 | b74159ee | Iustin Pop | if no_fork:
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163 | b74159ee | Iustin Pop | raise errors.ProgrammerError("utils.RunCmd() called with fork() disabled") |
164 | b74159ee | Iustin Pop | |
165 | a8083063 | Iustin Pop | if isinstance(cmd, list): |
166 | a8083063 | Iustin Pop | cmd = [str(val) for val in cmd] |
167 | 113b55aa | Iustin Pop | strcmd = " ".join(cmd)
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168 | 113b55aa | Iustin Pop | shell = False
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169 | 113b55aa | Iustin Pop | else:
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170 | 113b55aa | Iustin Pop | strcmd = cmd |
171 | 113b55aa | Iustin Pop | shell = True
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172 | bb698c1f | Iustin Pop | logging.debug("RunCmd '%s'", strcmd)
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173 | 2557ff82 | Guido Trotter | |
174 | bf4daac9 | Guido Trotter | if not reset_env: |
175 | bf4daac9 | Guido Trotter | cmd_env = os.environ.copy() |
176 | bf4daac9 | Guido Trotter | cmd_env["LC_ALL"] = "C" |
177 | bf4daac9 | Guido Trotter | else:
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178 | bf4daac9 | Guido Trotter | cmd_env = {} |
179 | bf4daac9 | Guido Trotter | |
180 | 2557ff82 | Guido Trotter | if env is not None: |
181 | 2557ff82 | Guido Trotter | cmd_env.update(env) |
182 | 2557ff82 | Guido Trotter | |
183 | c803b052 | Iustin Pop | try:
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184 | c803b052 | Iustin Pop | if output is None: |
185 | c803b052 | Iustin Pop | out, err, status = _RunCmdPipe(cmd, cmd_env, shell, cwd) |
186 | c803b052 | Iustin Pop | else:
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187 | c803b052 | Iustin Pop | status = _RunCmdFile(cmd, cmd_env, shell, output, cwd) |
188 | c803b052 | Iustin Pop | out = err = ""
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189 | c803b052 | Iustin Pop | except OSError, err: |
190 | c803b052 | Iustin Pop | if err.errno == errno.ENOENT:
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191 | c803b052 | Iustin Pop | raise errors.OpExecError("Can't execute '%s': not found (%s)" % |
192 | c803b052 | Iustin Pop | (strcmd, err)) |
193 | c803b052 | Iustin Pop | else:
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194 | c803b052 | Iustin Pop | raise
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195 | 36117c2b | Iustin Pop | |
196 | 36117c2b | Iustin Pop | if status >= 0: |
197 | 36117c2b | Iustin Pop | exitcode = status |
198 | 36117c2b | Iustin Pop | signal_ = None
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199 | 36117c2b | Iustin Pop | else:
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200 | 36117c2b | Iustin Pop | exitcode = None
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201 | 36117c2b | Iustin Pop | signal_ = -status |
202 | 36117c2b | Iustin Pop | |
203 | 36117c2b | Iustin Pop | return RunResult(exitcode, signal_, out, err, strcmd)
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204 | 36117c2b | Iustin Pop | |
205 | ae59efea | Michael Hanselmann | |
206 | 8797df43 | Iustin Pop | def _RunCmdPipe(cmd, env, via_shell, cwd): |
207 | 36117c2b | Iustin Pop | """Run a command and return its output.
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208 | 36117c2b | Iustin Pop |
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209 | 36117c2b | Iustin Pop | @type cmd: string or list
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210 | 36117c2b | Iustin Pop | @param cmd: Command to run
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211 | 36117c2b | Iustin Pop | @type env: dict
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212 | 36117c2b | Iustin Pop | @param env: The environment to use
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213 | 36117c2b | Iustin Pop | @type via_shell: bool
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214 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
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215 | 8797df43 | Iustin Pop | @type cwd: string
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216 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
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217 | 36117c2b | Iustin Pop | @rtype: tuple
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218 | 36117c2b | Iustin Pop | @return: (out, err, status)
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219 | 36117c2b | Iustin Pop |
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220 | 36117c2b | Iustin Pop | """
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221 | 9c233417 | Iustin Pop | poller = select.poll() |
222 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
223 | 113b55aa | Iustin Pop | stderr=subprocess.PIPE, |
224 | 113b55aa | Iustin Pop | stdout=subprocess.PIPE, |
225 | 113b55aa | Iustin Pop | stdin=subprocess.PIPE, |
226 | 8797df43 | Iustin Pop | close_fds=True, env=env,
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227 | 8797df43 | Iustin Pop | cwd=cwd) |
228 | 113b55aa | Iustin Pop | |
229 | 113b55aa | Iustin Pop | child.stdin.close() |
230 | 9c233417 | Iustin Pop | poller.register(child.stdout, select.POLLIN) |
231 | 9c233417 | Iustin Pop | poller.register(child.stderr, select.POLLIN) |
232 | 9c233417 | Iustin Pop | out = StringIO() |
233 | 9c233417 | Iustin Pop | err = StringIO() |
234 | 9c233417 | Iustin Pop | fdmap = { |
235 | 9c233417 | Iustin Pop | child.stdout.fileno(): (out, child.stdout), |
236 | 9c233417 | Iustin Pop | child.stderr.fileno(): (err, child.stderr), |
237 | 9c233417 | Iustin Pop | } |
238 | 9c233417 | Iustin Pop | for fd in fdmap: |
239 | 9c233417 | Iustin Pop | status = fcntl.fcntl(fd, fcntl.F_GETFL) |
240 | 9c233417 | Iustin Pop | fcntl.fcntl(fd, fcntl.F_SETFL, status | os.O_NONBLOCK) |
241 | 9c233417 | Iustin Pop | |
242 | 9c233417 | Iustin Pop | while fdmap:
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243 | bf988c29 | Guido Trotter | try:
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244 | bf988c29 | Guido Trotter | pollresult = poller.poll() |
245 | bf988c29 | Guido Trotter | except EnvironmentError, eerr: |
246 | bf988c29 | Guido Trotter | if eerr.errno == errno.EINTR:
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247 | bf988c29 | Guido Trotter | continue
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248 | bf988c29 | Guido Trotter | raise
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249 | bf988c29 | Guido Trotter | except select.error, serr:
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250 | bf988c29 | Guido Trotter | if serr[0] == errno.EINTR: |
251 | bf988c29 | Guido Trotter | continue
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252 | bf988c29 | Guido Trotter | raise
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253 | bf988c29 | Guido Trotter | |
254 | bf988c29 | Guido Trotter | for fd, event in pollresult: |
255 | 9c233417 | Iustin Pop | if event & select.POLLIN or event & select.POLLPRI: |
256 | 9c233417 | Iustin Pop | data = fdmap[fd][1].read()
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257 | 9c233417 | Iustin Pop | # no data from read signifies EOF (the same as POLLHUP)
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258 | 9c233417 | Iustin Pop | if not data: |
259 | 9c233417 | Iustin Pop | poller.unregister(fd) |
260 | 9c233417 | Iustin Pop | del fdmap[fd]
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261 | 9c233417 | Iustin Pop | continue
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262 | 9c233417 | Iustin Pop | fdmap[fd][0].write(data)
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263 | 9c233417 | Iustin Pop | if (event & select.POLLNVAL or event & select.POLLHUP or |
264 | 9c233417 | Iustin Pop | event & select.POLLERR): |
265 | 9c233417 | Iustin Pop | poller.unregister(fd) |
266 | 9c233417 | Iustin Pop | del fdmap[fd]
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267 | 9c233417 | Iustin Pop | |
268 | 9c233417 | Iustin Pop | out = out.getvalue() |
269 | 9c233417 | Iustin Pop | err = err.getvalue() |
270 | a8083063 | Iustin Pop | |
271 | a8083063 | Iustin Pop | status = child.wait() |
272 | 36117c2b | Iustin Pop | return out, err, status
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273 | a8083063 | Iustin Pop | |
274 | 36117c2b | Iustin Pop | |
275 | 8797df43 | Iustin Pop | def _RunCmdFile(cmd, env, via_shell, output, cwd): |
276 | 36117c2b | Iustin Pop | """Run a command and save its output to a file.
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277 | 36117c2b | Iustin Pop |
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278 | 36117c2b | Iustin Pop | @type cmd: string or list
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279 | 36117c2b | Iustin Pop | @param cmd: Command to run
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280 | 36117c2b | Iustin Pop | @type env: dict
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281 | 36117c2b | Iustin Pop | @param env: The environment to use
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282 | 36117c2b | Iustin Pop | @type via_shell: bool
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283 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
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284 | 36117c2b | Iustin Pop | @type output: str
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285 | 36117c2b | Iustin Pop | @param output: the filename in which to save the output
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286 | 8797df43 | Iustin Pop | @type cwd: string
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287 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
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288 | 36117c2b | Iustin Pop | @rtype: int
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289 | 36117c2b | Iustin Pop | @return: the exit status
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290 | 36117c2b | Iustin Pop |
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291 | 36117c2b | Iustin Pop | """
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292 | 36117c2b | Iustin Pop | fh = open(output, "a") |
293 | 36117c2b | Iustin Pop | try:
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294 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
295 | 36117c2b | Iustin Pop | stderr=subprocess.STDOUT, |
296 | 36117c2b | Iustin Pop | stdout=fh, |
297 | 36117c2b | Iustin Pop | stdin=subprocess.PIPE, |
298 | 8797df43 | Iustin Pop | close_fds=True, env=env,
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299 | 8797df43 | Iustin Pop | cwd=cwd) |
300 | 36117c2b | Iustin Pop | |
301 | 36117c2b | Iustin Pop | child.stdin.close() |
302 | 36117c2b | Iustin Pop | status = child.wait() |
303 | 36117c2b | Iustin Pop | finally:
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304 | 36117c2b | Iustin Pop | fh.close() |
305 | 36117c2b | Iustin Pop | return status
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306 | a8083063 | Iustin Pop | |
307 | a8083063 | Iustin Pop | |
308 | 6bb65e3a | Guido Trotter | def RunParts(dir_name, env=None, reset_env=False): |
309 | 6bb65e3a | Guido Trotter | """Run Scripts or programs in a directory
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310 | 6bb65e3a | Guido Trotter |
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311 | 6bb65e3a | Guido Trotter | @type dir_name: string
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312 | 6bb65e3a | Guido Trotter | @param dir_name: absolute path to a directory
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313 | 6bb65e3a | Guido Trotter | @type env: dict
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314 | 6bb65e3a | Guido Trotter | @param env: The environment to use
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315 | 6bb65e3a | Guido Trotter | @type reset_env: boolean
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316 | 6bb65e3a | Guido Trotter | @param reset_env: whether to reset or keep the default os environment
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317 | 6bb65e3a | Guido Trotter | @rtype: list of tuples
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318 | 6bb65e3a | Guido Trotter | @return: list of (name, (one of RUNDIR_STATUS), RunResult)
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319 | 6bb65e3a | Guido Trotter |
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320 | 6bb65e3a | Guido Trotter | """
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321 | 6bb65e3a | Guido Trotter | rr = [] |
322 | 6bb65e3a | Guido Trotter | |
323 | 6bb65e3a | Guido Trotter | try:
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324 | 6bb65e3a | Guido Trotter | dir_contents = ListVisibleFiles(dir_name) |
325 | 6bb65e3a | Guido Trotter | except OSError, err: |
326 | 6bb65e3a | Guido Trotter | logging.warning("RunParts: skipping %s (cannot list: %s)", dir_name, err)
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327 | 6bb65e3a | Guido Trotter | return rr
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328 | 6bb65e3a | Guido Trotter | |
329 | 6bb65e3a | Guido Trotter | for relname in sorted(dir_contents): |
330 | c4feafe8 | Iustin Pop | fname = PathJoin(dir_name, relname) |
331 | 6bb65e3a | Guido Trotter | if not (os.path.isfile(fname) and os.access(fname, os.X_OK) and |
332 | 6bb65e3a | Guido Trotter | constants.EXT_PLUGIN_MASK.match(relname) is not None): |
333 | 6bb65e3a | Guido Trotter | rr.append((relname, constants.RUNPARTS_SKIP, None))
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334 | 6bb65e3a | Guido Trotter | else:
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335 | 6bb65e3a | Guido Trotter | try:
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336 | 6bb65e3a | Guido Trotter | result = RunCmd([fname], env=env, reset_env=reset_env) |
337 | 6bb65e3a | Guido Trotter | except Exception, err: # pylint: disable-msg=W0703 |
338 | 6bb65e3a | Guido Trotter | rr.append((relname, constants.RUNPARTS_ERR, str(err)))
|
339 | 6bb65e3a | Guido Trotter | else:
|
340 | 6bb65e3a | Guido Trotter | rr.append((relname, constants.RUNPARTS_RUN, result)) |
341 | 6bb65e3a | Guido Trotter | |
342 | 6bb65e3a | Guido Trotter | return rr
|
343 | 6bb65e3a | Guido Trotter | |
344 | 6bb65e3a | Guido Trotter | |
345 | f93f2016 | Michael Hanselmann | def GetSocketCredentials(sock): |
346 | f93f2016 | Michael Hanselmann | """Returns the credentials of the foreign process connected to a socket.
|
347 | f93f2016 | Michael Hanselmann |
|
348 | f93f2016 | Michael Hanselmann | @param sock: Unix socket
|
349 | f93f2016 | Michael Hanselmann | @rtype: tuple; (number, number, number)
|
350 | f93f2016 | Michael Hanselmann | @return: The PID, UID and GID of the connected foreign process.
|
351 | f93f2016 | Michael Hanselmann |
|
352 | f93f2016 | Michael Hanselmann | """
|
353 | f93f2016 | Michael Hanselmann | peercred = sock.getsockopt(socket.SOL_SOCKET, IN.SO_PEERCRED, |
354 | f93f2016 | Michael Hanselmann | _STRUCT_UCRED_SIZE) |
355 | f93f2016 | Michael Hanselmann | return struct.unpack(_STRUCT_UCRED, peercred)
|
356 | f93f2016 | Michael Hanselmann | |
357 | f93f2016 | Michael Hanselmann | |
358 | a8083063 | Iustin Pop | def RemoveFile(filename): |
359 | a8083063 | Iustin Pop | """Remove a file ignoring some errors.
|
360 | a8083063 | Iustin Pop |
|
361 | a8083063 | Iustin Pop | Remove a file, ignoring non-existing ones or directories. Other
|
362 | a8083063 | Iustin Pop | errors are passed.
|
363 | a8083063 | Iustin Pop |
|
364 | 58885d79 | Iustin Pop | @type filename: str
|
365 | 58885d79 | Iustin Pop | @param filename: the file to be removed
|
366 | 58885d79 | Iustin Pop |
|
367 | a8083063 | Iustin Pop | """
|
368 | a8083063 | Iustin Pop | try:
|
369 | a8083063 | Iustin Pop | os.unlink(filename) |
370 | a8083063 | Iustin Pop | except OSError, err: |
371 | 4ca1b175 | Alexander Schreiber | if err.errno not in (errno.ENOENT, errno.EISDIR): |
372 | a8083063 | Iustin Pop | raise
|
373 | a8083063 | Iustin Pop | |
374 | a8083063 | Iustin Pop | |
375 | 6e797216 | Michael Hanselmann | def RenameFile(old, new, mkdir=False, mkdir_mode=0750): |
376 | 6e797216 | Michael Hanselmann | """Renames a file.
|
377 | 6e797216 | Michael Hanselmann |
|
378 | 6e797216 | Michael Hanselmann | @type old: string
|
379 | 6e797216 | Michael Hanselmann | @param old: Original path
|
380 | 6e797216 | Michael Hanselmann | @type new: string
|
381 | 6e797216 | Michael Hanselmann | @param new: New path
|
382 | 6e797216 | Michael Hanselmann | @type mkdir: bool
|
383 | 6e797216 | Michael Hanselmann | @param mkdir: Whether to create target directory if it doesn't exist
|
384 | 6e797216 | Michael Hanselmann | @type mkdir_mode: int
|
385 | 6e797216 | Michael Hanselmann | @param mkdir_mode: Mode for newly created directories
|
386 | 6e797216 | Michael Hanselmann |
|
387 | 6e797216 | Michael Hanselmann | """
|
388 | 6e797216 | Michael Hanselmann | try:
|
389 | 6e797216 | Michael Hanselmann | return os.rename(old, new)
|
390 | 6e797216 | Michael Hanselmann | except OSError, err: |
391 | 6e797216 | Michael Hanselmann | # In at least one use case of this function, the job queue, directory
|
392 | 6e797216 | Michael Hanselmann | # creation is very rare. Checking for the directory before renaming is not
|
393 | 6e797216 | Michael Hanselmann | # as efficient.
|
394 | 6e797216 | Michael Hanselmann | if mkdir and err.errno == errno.ENOENT: |
395 | 6e797216 | Michael Hanselmann | # Create directory and try again
|
396 | cc2f004d | Michael Hanselmann | Makedirs(os.path.dirname(new), mode=mkdir_mode) |
397 | a426508d | Michael Hanselmann | |
398 | 6e797216 | Michael Hanselmann | return os.rename(old, new)
|
399 | a426508d | Michael Hanselmann | |
400 | 6e797216 | Michael Hanselmann | raise
|
401 | 6e797216 | Michael Hanselmann | |
402 | 6e797216 | Michael Hanselmann | |
403 | 76e5f8b5 | Michael Hanselmann | def Makedirs(path, mode=0750): |
404 | 76e5f8b5 | Michael Hanselmann | """Super-mkdir; create a leaf directory and all intermediate ones.
|
405 | 76e5f8b5 | Michael Hanselmann |
|
406 | 76e5f8b5 | Michael Hanselmann | This is a wrapper around C{os.makedirs} adding error handling not implemented
|
407 | 76e5f8b5 | Michael Hanselmann | before Python 2.5.
|
408 | 76e5f8b5 | Michael Hanselmann |
|
409 | 76e5f8b5 | Michael Hanselmann | """
|
410 | 76e5f8b5 | Michael Hanselmann | try:
|
411 | 76e5f8b5 | Michael Hanselmann | os.makedirs(path, mode) |
412 | 76e5f8b5 | Michael Hanselmann | except OSError, err: |
413 | 76e5f8b5 | Michael Hanselmann | # Ignore EEXIST. This is only handled in os.makedirs as included in
|
414 | 76e5f8b5 | Michael Hanselmann | # Python 2.5 and above.
|
415 | 76e5f8b5 | Michael Hanselmann | if err.errno != errno.EEXIST or not os.path.exists(path): |
416 | 76e5f8b5 | Michael Hanselmann | raise
|
417 | 76e5f8b5 | Michael Hanselmann | |
418 | 76e5f8b5 | Michael Hanselmann | |
419 | 055f822b | Michael Hanselmann | def ResetTempfileModule(): |
420 | 055f822b | Michael Hanselmann | """Resets the random name generator of the tempfile module.
|
421 | 055f822b | Michael Hanselmann |
|
422 | 055f822b | Michael Hanselmann | This function should be called after C{os.fork} in the child process to
|
423 | 055f822b | Michael Hanselmann | ensure it creates a newly seeded random generator. Otherwise it would
|
424 | 055f822b | Michael Hanselmann | generate the same random parts as the parent process. If several processes
|
425 | 055f822b | Michael Hanselmann | race for the creation of a temporary file, this could lead to one not getting
|
426 | 055f822b | Michael Hanselmann | a temporary name.
|
427 | 055f822b | Michael Hanselmann |
|
428 | 055f822b | Michael Hanselmann | """
|
429 | 055f822b | Michael Hanselmann | # pylint: disable-msg=W0212
|
430 | 055f822b | Michael Hanselmann | if hasattr(tempfile, "_once_lock") and hasattr(tempfile, "_name_sequence"): |
431 | 055f822b | Michael Hanselmann | tempfile._once_lock.acquire() |
432 | 055f822b | Michael Hanselmann | try:
|
433 | 055f822b | Michael Hanselmann | # Reset random name generator
|
434 | 055f822b | Michael Hanselmann | tempfile._name_sequence = None
|
435 | 055f822b | Michael Hanselmann | finally:
|
436 | 055f822b | Michael Hanselmann | tempfile._once_lock.release() |
437 | 055f822b | Michael Hanselmann | else:
|
438 | 055f822b | Michael Hanselmann | logging.critical("The tempfile module misses at least one of the"
|
439 | 055f822b | Michael Hanselmann | " '_once_lock' and '_name_sequence' attributes")
|
440 | 055f822b | Michael Hanselmann | |
441 | 055f822b | Michael Hanselmann | |
442 | a8083063 | Iustin Pop | def _FingerprintFile(filename): |
443 | a8083063 | Iustin Pop | """Compute the fingerprint of a file.
|
444 | a8083063 | Iustin Pop |
|
445 | a8083063 | Iustin Pop | If the file does not exist, a None will be returned
|
446 | a8083063 | Iustin Pop | instead.
|
447 | a8083063 | Iustin Pop |
|
448 | 58885d79 | Iustin Pop | @type filename: str
|
449 | 58885d79 | Iustin Pop | @param filename: the filename to checksum
|
450 | 58885d79 | Iustin Pop | @rtype: str
|
451 | 58885d79 | Iustin Pop | @return: the hex digest of the sha checksum of the contents
|
452 | 58885d79 | Iustin Pop | of the file
|
453 | a8083063 | Iustin Pop |
|
454 | a8083063 | Iustin Pop | """
|
455 | a8083063 | Iustin Pop | if not (os.path.exists(filename) and os.path.isfile(filename)): |
456 | a8083063 | Iustin Pop | return None |
457 | a8083063 | Iustin Pop | |
458 | a8083063 | Iustin Pop | f = open(filename)
|
459 | a8083063 | Iustin Pop | |
460 | 7ffe8fba | Carlos Valiente | fp = sha1() |
461 | a8083063 | Iustin Pop | while True: |
462 | a8083063 | Iustin Pop | data = f.read(4096)
|
463 | a8083063 | Iustin Pop | if not data: |
464 | a8083063 | Iustin Pop | break
|
465 | a8083063 | Iustin Pop | |
466 | a8083063 | Iustin Pop | fp.update(data) |
467 | a8083063 | Iustin Pop | |
468 | a8083063 | Iustin Pop | return fp.hexdigest()
|
469 | a8083063 | Iustin Pop | |
470 | a8083063 | Iustin Pop | |
471 | a8083063 | Iustin Pop | def FingerprintFiles(files): |
472 | a8083063 | Iustin Pop | """Compute fingerprints for a list of files.
|
473 | a8083063 | Iustin Pop |
|
474 | 58885d79 | Iustin Pop | @type files: list
|
475 | 58885d79 | Iustin Pop | @param files: the list of filename to fingerprint
|
476 | 58885d79 | Iustin Pop | @rtype: dict
|
477 | 58885d79 | Iustin Pop | @return: a dictionary filename: fingerprint, holding only
|
478 | 58885d79 | Iustin Pop | existing files
|
479 | a8083063 | Iustin Pop |
|
480 | a8083063 | Iustin Pop | """
|
481 | a8083063 | Iustin Pop | ret = {} |
482 | a8083063 | Iustin Pop | |
483 | a8083063 | Iustin Pop | for filename in files: |
484 | a8083063 | Iustin Pop | cksum = _FingerprintFile(filename) |
485 | a8083063 | Iustin Pop | if cksum:
|
486 | a8083063 | Iustin Pop | ret[filename] = cksum |
487 | a8083063 | Iustin Pop | |
488 | a8083063 | Iustin Pop | return ret
|
489 | a8083063 | Iustin Pop | |
490 | a8083063 | Iustin Pop | |
491 | a5728081 | Guido Trotter | def ForceDictType(target, key_types, allowed_values=None): |
492 | a5728081 | Guido Trotter | """Force the values of a dict to have certain types.
|
493 | a5728081 | Guido Trotter |
|
494 | a5728081 | Guido Trotter | @type target: dict
|
495 | a5728081 | Guido Trotter | @param target: the dict to update
|
496 | a5728081 | Guido Trotter | @type key_types: dict
|
497 | a5728081 | Guido Trotter | @param key_types: dict mapping target dict keys to types
|
498 | a5728081 | Guido Trotter | in constants.ENFORCEABLE_TYPES
|
499 | a5728081 | Guido Trotter | @type allowed_values: list
|
500 | a5728081 | Guido Trotter | @keyword allowed_values: list of specially allowed values
|
501 | a5728081 | Guido Trotter |
|
502 | a5728081 | Guido Trotter | """
|
503 | a5728081 | Guido Trotter | if allowed_values is None: |
504 | a5728081 | Guido Trotter | allowed_values = [] |
505 | a5728081 | Guido Trotter | |
506 | 8b46606c | Guido Trotter | if not isinstance(target, dict): |
507 | 8b46606c | Guido Trotter | msg = "Expected dictionary, got '%s'" % target
|
508 | 8b46606c | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
509 | 8b46606c | Guido Trotter | |
510 | a5728081 | Guido Trotter | for key in target: |
511 | a5728081 | Guido Trotter | if key not in key_types: |
512 | a5728081 | Guido Trotter | msg = "Unknown key '%s'" % key
|
513 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
514 | a5728081 | Guido Trotter | |
515 | a5728081 | Guido Trotter | if target[key] in allowed_values: |
516 | a5728081 | Guido Trotter | continue
|
517 | a5728081 | Guido Trotter | |
518 | 29921401 | Iustin Pop | ktype = key_types[key] |
519 | 29921401 | Iustin Pop | if ktype not in constants.ENFORCEABLE_TYPES: |
520 | 29921401 | Iustin Pop | msg = "'%s' has non-enforceable type %s" % (key, ktype)
|
521 | a5728081 | Guido Trotter | raise errors.ProgrammerError(msg)
|
522 | a5728081 | Guido Trotter | |
523 | 29921401 | Iustin Pop | if ktype == constants.VTYPE_STRING:
|
524 | a5728081 | Guido Trotter | if not isinstance(target[key], basestring): |
525 | a5728081 | Guido Trotter | if isinstance(target[key], bool) and not target[key]: |
526 | a5728081 | Guido Trotter | target[key] = ''
|
527 | a5728081 | Guido Trotter | else:
|
528 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid string" % (key, target[key])
|
529 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
530 | 29921401 | Iustin Pop | elif ktype == constants.VTYPE_BOOL:
|
531 | a5728081 | Guido Trotter | if isinstance(target[key], basestring) and target[key]: |
532 | a5728081 | Guido Trotter | if target[key].lower() == constants.VALUE_FALSE:
|
533 | a5728081 | Guido Trotter | target[key] = False
|
534 | a5728081 | Guido Trotter | elif target[key].lower() == constants.VALUE_TRUE:
|
535 | a5728081 | Guido Trotter | target[key] = True
|
536 | a5728081 | Guido Trotter | else:
|
537 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid boolean" % (key, target[key])
|
538 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
539 | a5728081 | Guido Trotter | elif target[key]:
|
540 | a5728081 | Guido Trotter | target[key] = True
|
541 | a5728081 | Guido Trotter | else:
|
542 | a5728081 | Guido Trotter | target[key] = False
|
543 | 29921401 | Iustin Pop | elif ktype == constants.VTYPE_SIZE:
|
544 | a5728081 | Guido Trotter | try:
|
545 | a5728081 | Guido Trotter | target[key] = ParseUnit(target[key]) |
546 | a5728081 | Guido Trotter | except errors.UnitParseError, err:
|
547 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid size. error: %s" % \
|
548 | a5728081 | Guido Trotter | (key, target[key], err) |
549 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
550 | 29921401 | Iustin Pop | elif ktype == constants.VTYPE_INT:
|
551 | a5728081 | Guido Trotter | try:
|
552 | a5728081 | Guido Trotter | target[key] = int(target[key])
|
553 | a5728081 | Guido Trotter | except (ValueError, TypeError): |
554 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid integer" % (key, target[key])
|
555 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
556 | a5728081 | Guido Trotter | |
557 | a5728081 | Guido Trotter | |
558 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
559 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
|
560 | a8083063 | Iustin Pop |
|
561 | 44bf25ff | Iustin Pop | @note: zombie status is not handled, so zombie processes
|
562 | 44bf25ff | Iustin Pop | will be returned as alive
|
563 | 58885d79 | Iustin Pop | @type pid: int
|
564 | 58885d79 | Iustin Pop | @param pid: the process ID to check
|
565 | 58885d79 | Iustin Pop | @rtype: boolean
|
566 | 58885d79 | Iustin Pop | @return: True if the process exists
|
567 | a8083063 | Iustin Pop |
|
568 | a8083063 | Iustin Pop | """
|
569 | 5ef5ea45 | Guido Trotter | def _TryStat(name): |
570 | 5ef5ea45 | Guido Trotter | try:
|
571 | 5ef5ea45 | Guido Trotter | os.stat(name) |
572 | 5ef5ea45 | Guido Trotter | return True |
573 | 5ef5ea45 | Guido Trotter | except EnvironmentError, err: |
574 | 5ef5ea45 | Guido Trotter | if err.errno in (errno.ENOENT, errno.ENOTDIR): |
575 | 5ef5ea45 | Guido Trotter | return False |
576 | 5ef5ea45 | Guido Trotter | elif err.errno == errno.EINVAL:
|
577 | 5ef5ea45 | Guido Trotter | raise RetryAgain(err)
|
578 | 5ef5ea45 | Guido Trotter | raise
|
579 | 5ef5ea45 | Guido Trotter | |
580 | 5ef5ea45 | Guido Trotter | assert isinstance(pid, int), "pid must be an integer" |
581 | d9f311d7 | Iustin Pop | if pid <= 0: |
582 | d9f311d7 | Iustin Pop | return False |
583 | d9f311d7 | Iustin Pop | |
584 | 5ef5ea45 | Guido Trotter | proc_entry = "/proc/%d/status" % pid
|
585 | 5ef5ea45 | Guido Trotter | # /proc in a multiprocessor environment can have strange behaviors.
|
586 | 5ef5ea45 | Guido Trotter | # Retry the os.stat a few times until we get a good result.
|
587 | a8083063 | Iustin Pop | try:
|
588 | 5ef5ea45 | Guido Trotter | return Retry(_TryStat, (0.01, 1.5, 0.1), 0.5, args=[proc_entry]) |
589 | 5ef5ea45 | Guido Trotter | except RetryTimeout, err:
|
590 | 5ef5ea45 | Guido Trotter | err.RaiseInner() |
591 | a8083063 | Iustin Pop | |
592 | a8083063 | Iustin Pop | |
593 | d9f311d7 | Iustin Pop | def ReadPidFile(pidfile): |
594 | 58885d79 | Iustin Pop | """Read a pid from a file.
|
595 | fee80e90 | Guido Trotter |
|
596 | 58885d79 | Iustin Pop | @type pidfile: string
|
597 | 58885d79 | Iustin Pop | @param pidfile: path to the file containing the pid
|
598 | 58885d79 | Iustin Pop | @rtype: int
|
599 | 1de62f37 | Guido Trotter | @return: The process id, if the file exists and contains a valid PID,
|
600 | d9f311d7 | Iustin Pop | otherwise 0
|
601 | fee80e90 | Guido Trotter |
|
602 | fee80e90 | Guido Trotter | """
|
603 | fee80e90 | Guido Trotter | try:
|
604 | 682f7601 | Guido Trotter | raw_data = ReadOneLineFile(pidfile) |
605 | d9f311d7 | Iustin Pop | except EnvironmentError, err: |
606 | d9f311d7 | Iustin Pop | if err.errno != errno.ENOENT:
|
607 | 13998ef2 | Michael Hanselmann | logging.exception("Can't read pid file")
|
608 | d9f311d7 | Iustin Pop | return 0 |
609 | fee80e90 | Guido Trotter | |
610 | fee80e90 | Guido Trotter | try:
|
611 | 13998ef2 | Michael Hanselmann | pid = int(raw_data)
|
612 | 691744c4 | Iustin Pop | except (TypeError, ValueError), err: |
613 | 8161a646 | Iustin Pop | logging.info("Can't parse pid file contents", exc_info=True) |
614 | d9f311d7 | Iustin Pop | return 0 |
615 | fee80e90 | Guido Trotter | |
616 | d9f311d7 | Iustin Pop | return pid
|
617 | fee80e90 | Guido Trotter | |
618 | fee80e90 | Guido Trotter | |
619 | 256eb94b | Guido Trotter | def MatchNameComponent(key, name_list, case_sensitive=True): |
620 | a8083063 | Iustin Pop | """Try to match a name against a list.
|
621 | a8083063 | Iustin Pop |
|
622 | a8083063 | Iustin Pop | This function will try to match a name like test1 against a list
|
623 | 58885d79 | Iustin Pop | like C{['test1.example.com', 'test2.example.com', ...]}. Against
|
624 | 58885d79 | Iustin Pop | this list, I{'test1'} as well as I{'test1.example'} will match, but
|
625 | 58885d79 | Iustin Pop | not I{'test1.ex'}. A multiple match will be considered as no match
|
626 | 58885d79 | Iustin Pop | at all (e.g. I{'test1'} against C{['test1.example.com',
|
627 | 3a541d90 | Iustin Pop | 'test1.example.org']}), except when the key fully matches an entry
|
628 | 3a541d90 | Iustin Pop | (e.g. I{'test1'} against C{['test1', 'test1.example.com']}).
|
629 | a8083063 | Iustin Pop |
|
630 | 58885d79 | Iustin Pop | @type key: str
|
631 | 58885d79 | Iustin Pop | @param key: the name to be searched
|
632 | 58885d79 | Iustin Pop | @type name_list: list
|
633 | 58885d79 | Iustin Pop | @param name_list: the list of strings against which to search the key
|
634 | 256eb94b | Guido Trotter | @type case_sensitive: boolean
|
635 | 256eb94b | Guido Trotter | @param case_sensitive: whether to provide a case-sensitive match
|
636 | a8083063 | Iustin Pop |
|
637 | 58885d79 | Iustin Pop | @rtype: None or str
|
638 | 58885d79 | Iustin Pop | @return: None if there is no match I{or} if there are multiple matches,
|
639 | 58885d79 | Iustin Pop | otherwise the element from the list which matches
|
640 | a8083063 | Iustin Pop |
|
641 | a8083063 | Iustin Pop | """
|
642 | 3a541d90 | Iustin Pop | if key in name_list: |
643 | 3a541d90 | Iustin Pop | return key
|
644 | 256eb94b | Guido Trotter | |
645 | 256eb94b | Guido Trotter | re_flags = 0
|
646 | 256eb94b | Guido Trotter | if not case_sensitive: |
647 | 256eb94b | Guido Trotter | re_flags |= re.IGNORECASE |
648 | 099c52ad | Iustin Pop | key = key.upper() |
649 | 256eb94b | Guido Trotter | mo = re.compile("^%s(\..*)?$" % re.escape(key), re_flags)
|
650 | 256eb94b | Guido Trotter | names_filtered = [] |
651 | 256eb94b | Guido Trotter | string_matches = [] |
652 | 256eb94b | Guido Trotter | for name in name_list: |
653 | 256eb94b | Guido Trotter | if mo.match(name) is not None: |
654 | 256eb94b | Guido Trotter | names_filtered.append(name) |
655 | 099c52ad | Iustin Pop | if not case_sensitive and key == name.upper(): |
656 | 256eb94b | Guido Trotter | string_matches.append(name) |
657 | 256eb94b | Guido Trotter | |
658 | 256eb94b | Guido Trotter | if len(string_matches) == 1: |
659 | 256eb94b | Guido Trotter | return string_matches[0] |
660 | 256eb94b | Guido Trotter | if len(names_filtered) == 1: |
661 | 256eb94b | Guido Trotter | return names_filtered[0] |
662 | 256eb94b | Guido Trotter | return None |
663 | a8083063 | Iustin Pop | |
664 | a8083063 | Iustin Pop | |
665 | bcf043c9 | Iustin Pop | class HostInfo: |
666 | 89e1fc26 | Iustin Pop | """Class implementing resolver and hostname functionality
|
667 | bcf043c9 | Iustin Pop |
|
668 | bcf043c9 | Iustin Pop | """
|
669 | 26288e68 | Iustin Pop | _VALID_NAME_RE = re.compile("^[a-z0-9._-]{1,255}$")
|
670 | 26288e68 | Iustin Pop | |
671 | 89e1fc26 | Iustin Pop | def __init__(self, name=None): |
672 | bcf043c9 | Iustin Pop | """Initialize the host name object.
|
673 | bcf043c9 | Iustin Pop |
|
674 | 89e1fc26 | Iustin Pop | If the name argument is not passed, it will use this system's
|
675 | 89e1fc26 | Iustin Pop | name.
|
676 | bcf043c9 | Iustin Pop |
|
677 | bcf043c9 | Iustin Pop | """
|
678 | 89e1fc26 | Iustin Pop | if name is None: |
679 | 89e1fc26 | Iustin Pop | name = self.SysName()
|
680 | 89e1fc26 | Iustin Pop | |
681 | 89e1fc26 | Iustin Pop | self.query = name
|
682 | 89e1fc26 | Iustin Pop | self.name, self.aliases, self.ipaddrs = self.LookupHostname(name) |
683 | bcf043c9 | Iustin Pop | self.ip = self.ipaddrs[0] |
684 | bcf043c9 | Iustin Pop | |
685 | c8a0948f | Michael Hanselmann | def ShortName(self): |
686 | c8a0948f | Michael Hanselmann | """Returns the hostname without domain.
|
687 | c8a0948f | Michael Hanselmann |
|
688 | c8a0948f | Michael Hanselmann | """
|
689 | c8a0948f | Michael Hanselmann | return self.name.split('.')[0] |
690 | c8a0948f | Michael Hanselmann | |
691 | 89e1fc26 | Iustin Pop | @staticmethod
|
692 | 89e1fc26 | Iustin Pop | def SysName(): |
693 | 89e1fc26 | Iustin Pop | """Return the current system's name.
|
694 | bcf043c9 | Iustin Pop |
|
695 | 58885d79 | Iustin Pop | This is simply a wrapper over C{socket.gethostname()}.
|
696 | a8083063 | Iustin Pop |
|
697 | 89e1fc26 | Iustin Pop | """
|
698 | 89e1fc26 | Iustin Pop | return socket.gethostname()
|
699 | a8083063 | Iustin Pop | |
700 | 89e1fc26 | Iustin Pop | @staticmethod
|
701 | 89e1fc26 | Iustin Pop | def LookupHostname(hostname): |
702 | 89e1fc26 | Iustin Pop | """Look up hostname
|
703 | a8083063 | Iustin Pop |
|
704 | 58885d79 | Iustin Pop | @type hostname: str
|
705 | 58885d79 | Iustin Pop | @param hostname: hostname to look up
|
706 | 89e1fc26 | Iustin Pop |
|
707 | 58885d79 | Iustin Pop | @rtype: tuple
|
708 | 58885d79 | Iustin Pop | @return: a tuple (name, aliases, ipaddrs) as returned by
|
709 | 58885d79 | Iustin Pop | C{socket.gethostbyname_ex}
|
710 | 58885d79 | Iustin Pop | @raise errors.ResolverError: in case of errors in resolving
|
711 | 89e1fc26 | Iustin Pop |
|
712 | 89e1fc26 | Iustin Pop | """
|
713 | 89e1fc26 | Iustin Pop | try:
|
714 | 89e1fc26 | Iustin Pop | result = socket.gethostbyname_ex(hostname) |
715 | 89e1fc26 | Iustin Pop | except socket.gaierror, err:
|
716 | 89e1fc26 | Iustin Pop | # hostname not found in DNS
|
717 | 89e1fc26 | Iustin Pop | raise errors.ResolverError(hostname, err.args[0], err.args[1]) |
718 | a8083063 | Iustin Pop | |
719 | 89e1fc26 | Iustin Pop | return result
|
720 | a8083063 | Iustin Pop | |
721 | 26288e68 | Iustin Pop | @classmethod
|
722 | 26288e68 | Iustin Pop | def NormalizeName(cls, hostname): |
723 | 26288e68 | Iustin Pop | """Validate and normalize the given hostname.
|
724 | 26288e68 | Iustin Pop |
|
725 | 26288e68 | Iustin Pop | @attention: the validation is a bit more relaxed than the standards
|
726 | 26288e68 | Iustin Pop | require; most importantly, we allow underscores in names
|
727 | 26288e68 | Iustin Pop | @raise errors.OpPrereqError: when the name is not valid
|
728 | 26288e68 | Iustin Pop |
|
729 | 26288e68 | Iustin Pop | """
|
730 | 26288e68 | Iustin Pop | hostname = hostname.lower() |
731 | 26288e68 | Iustin Pop | if (not cls._VALID_NAME_RE.match(hostname) or |
732 | 26288e68 | Iustin Pop | # double-dots, meaning empty label
|
733 | 26288e68 | Iustin Pop | ".." in hostname or |
734 | 26288e68 | Iustin Pop | # empty initial label
|
735 | 26288e68 | Iustin Pop | hostname.startswith(".")):
|
736 | 26288e68 | Iustin Pop | raise errors.OpPrereqError("Invalid hostname '%s'" % hostname, |
737 | 26288e68 | Iustin Pop | errors.ECODE_INVAL) |
738 | 26288e68 | Iustin Pop | if hostname.endswith("."): |
739 | 26288e68 | Iustin Pop | hostname = hostname.rstrip(".")
|
740 | 26288e68 | Iustin Pop | return hostname
|
741 | 26288e68 | Iustin Pop | |
742 | a8083063 | Iustin Pop | |
743 | 104f4ca1 | Iustin Pop | def GetHostInfo(name=None): |
744 | 104f4ca1 | Iustin Pop | """Lookup host name and raise an OpPrereqError for failures"""
|
745 | 104f4ca1 | Iustin Pop | |
746 | 104f4ca1 | Iustin Pop | try:
|
747 | 104f4ca1 | Iustin Pop | return HostInfo(name)
|
748 | 104f4ca1 | Iustin Pop | except errors.ResolverError, err:
|
749 | 104f4ca1 | Iustin Pop | raise errors.OpPrereqError("The given name (%s) does not resolve: %s" % |
750 | 104f4ca1 | Iustin Pop | (err[0], err[2]), errors.ECODE_RESOLVER) |
751 | 104f4ca1 | Iustin Pop | |
752 | 104f4ca1 | Iustin Pop | |
753 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
754 | a8083063 | Iustin Pop | """List volume groups and their size
|
755 | a8083063 | Iustin Pop |
|
756 | 58885d79 | Iustin Pop | @rtype: dict
|
757 | 58885d79 | Iustin Pop | @return:
|
758 | 58885d79 | Iustin Pop | Dictionary with keys volume name and values
|
759 | 58885d79 | Iustin Pop | the size of the volume
|
760 | a8083063 | Iustin Pop |
|
761 | a8083063 | Iustin Pop | """
|
762 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
763 | a8083063 | Iustin Pop | result = RunCmd(command) |
764 | a8083063 | Iustin Pop | retval = {} |
765 | a8083063 | Iustin Pop | if result.failed:
|
766 | a8083063 | Iustin Pop | return retval
|
767 | a8083063 | Iustin Pop | |
768 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
769 | a8083063 | Iustin Pop | try:
|
770 | a8083063 | Iustin Pop | name, size = line.split() |
771 | a8083063 | Iustin Pop | size = int(float(size)) |
772 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
773 | bb698c1f | Iustin Pop | logging.error("Invalid output from vgs (%s): %s", err, line)
|
774 | a8083063 | Iustin Pop | continue
|
775 | a8083063 | Iustin Pop | |
776 | a8083063 | Iustin Pop | retval[name] = size |
777 | a8083063 | Iustin Pop | |
778 | a8083063 | Iustin Pop | return retval
|
779 | a8083063 | Iustin Pop | |
780 | a8083063 | Iustin Pop | |
781 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
782 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
783 | a8083063 | Iustin Pop |
|
784 | 58885d79 | Iustin Pop | @type bridge: str
|
785 | 58885d79 | Iustin Pop | @param bridge: the bridge name to check
|
786 | 58885d79 | Iustin Pop | @rtype: boolean
|
787 | 58885d79 | Iustin Pop | @return: True if it does
|
788 | a8083063 | Iustin Pop |
|
789 | a8083063 | Iustin Pop | """
|
790 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
791 | a8083063 | Iustin Pop | |
792 | a8083063 | Iustin Pop | |
793 | a8083063 | Iustin Pop | def NiceSort(name_list): |
794 | a8083063 | Iustin Pop | """Sort a list of strings based on digit and non-digit groupings.
|
795 | a8083063 | Iustin Pop |
|
796 | 58885d79 | Iustin Pop | Given a list of names C{['a1', 'a10', 'a11', 'a2']} this function
|
797 | 58885d79 | Iustin Pop | will sort the list in the logical order C{['a1', 'a2', 'a10',
|
798 | 58885d79 | Iustin Pop | 'a11']}.
|
799 | a8083063 | Iustin Pop |
|
800 | a8083063 | Iustin Pop | The sort algorithm breaks each name in groups of either only-digits
|
801 | a8083063 | Iustin Pop | or no-digits. Only the first eight such groups are considered, and
|
802 | a8083063 | Iustin Pop | after that we just use what's left of the string.
|
803 | a8083063 | Iustin Pop |
|
804 | 58885d79 | Iustin Pop | @type name_list: list
|
805 | 58885d79 | Iustin Pop | @param name_list: the names to be sorted
|
806 | 58885d79 | Iustin Pop | @rtype: list
|
807 | 58885d79 | Iustin Pop | @return: a copy of the name list sorted with our algorithm
|
808 | a8083063 | Iustin Pop |
|
809 | a8083063 | Iustin Pop | """
|
810 | a8083063 | Iustin Pop | _SORTER_BASE = "(\D+|\d+)"
|
811 | a8083063 | Iustin Pop | _SORTER_FULL = "^%s%s?%s?%s?%s?%s?%s?%s?.*$" % (_SORTER_BASE, _SORTER_BASE,
|
812 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
813 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
814 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE) |
815 | a8083063 | Iustin Pop | _SORTER_RE = re.compile(_SORTER_FULL) |
816 | a8083063 | Iustin Pop | _SORTER_NODIGIT = re.compile("^\D*$")
|
817 | a8083063 | Iustin Pop | def _TryInt(val): |
818 | a8083063 | Iustin Pop | """Attempts to convert a variable to integer."""
|
819 | a8083063 | Iustin Pop | if val is None or _SORTER_NODIGIT.match(val): |
820 | a8083063 | Iustin Pop | return val
|
821 | a8083063 | Iustin Pop | rval = int(val)
|
822 | a8083063 | Iustin Pop | return rval
|
823 | a8083063 | Iustin Pop | |
824 | a8083063 | Iustin Pop | to_sort = [([_TryInt(grp) for grp in _SORTER_RE.match(name).groups()], name) |
825 | a8083063 | Iustin Pop | for name in name_list] |
826 | a8083063 | Iustin Pop | to_sort.sort() |
827 | a8083063 | Iustin Pop | return [tup[1] for tup in to_sort] |
828 | a8083063 | Iustin Pop | |
829 | a8083063 | Iustin Pop | |
830 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
831 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
832 | a8083063 | Iustin Pop |
|
833 | 58885d79 | Iustin Pop | This function tries to apply function I{fn} to I{val}. If no
|
834 | 58885d79 | Iustin Pop | C{ValueError} or C{TypeError} exceptions are raised, it will return
|
835 | 58885d79 | Iustin Pop | the result, else it will return the original value. Any other
|
836 | 58885d79 | Iustin Pop | exceptions are propagated to the caller.
|
837 | 58885d79 | Iustin Pop |
|
838 | 58885d79 | Iustin Pop | @type fn: callable
|
839 | 58885d79 | Iustin Pop | @param fn: function to apply to the value
|
840 | 58885d79 | Iustin Pop | @param val: the value to be converted
|
841 | 58885d79 | Iustin Pop | @return: The converted value if the conversion was successful,
|
842 | 58885d79 | Iustin Pop | otherwise the original value.
|
843 | a8083063 | Iustin Pop |
|
844 | a8083063 | Iustin Pop | """
|
845 | a8083063 | Iustin Pop | try:
|
846 | a8083063 | Iustin Pop | nv = fn(val) |
847 | 7c4d6c7b | Michael Hanselmann | except (ValueError, TypeError): |
848 | a8083063 | Iustin Pop | nv = val |
849 | a8083063 | Iustin Pop | return nv
|
850 | a8083063 | Iustin Pop | |
851 | a8083063 | Iustin Pop | |
852 | a8083063 | Iustin Pop | def IsValidIP(ip): |
853 | 58885d79 | Iustin Pop | """Verifies the syntax of an IPv4 address.
|
854 | a8083063 | Iustin Pop |
|
855 | 58885d79 | Iustin Pop | This function checks if the IPv4 address passes is valid or not based
|
856 | 58885d79 | Iustin Pop | on syntax (not IP range, class calculations, etc.).
|
857 | 58885d79 | Iustin Pop |
|
858 | 58885d79 | Iustin Pop | @type ip: str
|
859 | 58885d79 | Iustin Pop | @param ip: the address to be checked
|
860 | 58885d79 | Iustin Pop | @rtype: a regular expression match object
|
861 | 5bbd3f7f | Michael Hanselmann | @return: a regular expression match object, or None if the
|
862 | 58885d79 | Iustin Pop | address is not valid
|
863 | a8083063 | Iustin Pop |
|
864 | a8083063 | Iustin Pop | """
|
865 | a8083063 | Iustin Pop | unit = "(0|[1-9]\d{0,2})"
|
866 | 58885d79 | Iustin Pop | #TODO: convert and return only boolean
|
867 | a8083063 | Iustin Pop | return re.match("^%s\.%s\.%s\.%s$" % (unit, unit, unit, unit), ip) |
868 | a8083063 | Iustin Pop | |
869 | a8083063 | Iustin Pop | |
870 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
871 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
872 | a8083063 | Iustin Pop |
|
873 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
874 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
875 | a8083063 | Iustin Pop | the actual command.
|
876 | a8083063 | Iustin Pop |
|
877 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
878 | a8083063 | Iustin Pop | side.
|
879 | a8083063 | Iustin Pop |
|
880 | 58885d79 | Iustin Pop | @type word: str
|
881 | 58885d79 | Iustin Pop | @param word: the word to check
|
882 | 58885d79 | Iustin Pop | @rtype: boolean
|
883 | 58885d79 | Iustin Pop | @return: True if the word is 'safe'
|
884 | 58885d79 | Iustin Pop |
|
885 | a8083063 | Iustin Pop | """
|
886 | a8083063 | Iustin Pop | return bool(re.match("^[-a-zA-Z0-9._+/:%@]+$", word)) |
887 | a8083063 | Iustin Pop | |
888 | a8083063 | Iustin Pop | |
889 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
890 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
891 | a8083063 | Iustin Pop |
|
892 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
893 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
894 | 5bbd3f7f | Michael Hanselmann | metacharacters). If everything is ok, it will return the result of
|
895 | a8083063 | Iustin Pop | template % args.
|
896 | a8083063 | Iustin Pop |
|
897 | 58885d79 | Iustin Pop | @type template: str
|
898 | 58885d79 | Iustin Pop | @param template: the string holding the template for the
|
899 | 58885d79 | Iustin Pop | string formatting
|
900 | 58885d79 | Iustin Pop | @rtype: str
|
901 | 58885d79 | Iustin Pop | @return: the expanded command line
|
902 | 58885d79 | Iustin Pop |
|
903 | a8083063 | Iustin Pop | """
|
904 | a8083063 | Iustin Pop | for word in args: |
905 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
906 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
907 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
908 | a8083063 | Iustin Pop | return template % args
|
909 | a8083063 | Iustin Pop | |
910 | a8083063 | Iustin Pop | |
911 | 9fbfbb7b | Iustin Pop | def FormatUnit(value, units): |
912 | a8083063 | Iustin Pop | """Formats an incoming number of MiB with the appropriate unit.
|
913 | a8083063 | Iustin Pop |
|
914 | 58885d79 | Iustin Pop | @type value: int
|
915 | 58885d79 | Iustin Pop | @param value: integer representing the value in MiB (1048576)
|
916 | 9fbfbb7b | Iustin Pop | @type units: char
|
917 | 9fbfbb7b | Iustin Pop | @param units: the type of formatting we should do:
|
918 | 9fbfbb7b | Iustin Pop | - 'h' for automatic scaling
|
919 | 9fbfbb7b | Iustin Pop | - 'm' for MiBs
|
920 | 9fbfbb7b | Iustin Pop | - 'g' for GiBs
|
921 | 9fbfbb7b | Iustin Pop | - 't' for TiBs
|
922 | 58885d79 | Iustin Pop | @rtype: str
|
923 | 58885d79 | Iustin Pop | @return: the formatted value (with suffix)
|
924 | a8083063 | Iustin Pop |
|
925 | a8083063 | Iustin Pop | """
|
926 | 9fbfbb7b | Iustin Pop | if units not in ('m', 'g', 't', 'h'): |
927 | 9fbfbb7b | Iustin Pop | raise errors.ProgrammerError("Invalid unit specified '%s'" % str(units)) |
928 | a8083063 | Iustin Pop | |
929 | 9fbfbb7b | Iustin Pop | suffix = ''
|
930 | 9fbfbb7b | Iustin Pop | |
931 | 9fbfbb7b | Iustin Pop | if units == 'm' or (units == 'h' and value < 1024): |
932 | 9fbfbb7b | Iustin Pop | if units == 'h': |
933 | 9fbfbb7b | Iustin Pop | suffix = 'M'
|
934 | 9fbfbb7b | Iustin Pop | return "%d%s" % (round(value, 0), suffix) |
935 | 9fbfbb7b | Iustin Pop | |
936 | 9fbfbb7b | Iustin Pop | elif units == 'g' or (units == 'h' and value < (1024 * 1024)): |
937 | 9fbfbb7b | Iustin Pop | if units == 'h': |
938 | 9fbfbb7b | Iustin Pop | suffix = 'G'
|
939 | 9fbfbb7b | Iustin Pop | return "%0.1f%s" % (round(float(value) / 1024, 1), suffix) |
940 | a8083063 | Iustin Pop | |
941 | a8083063 | Iustin Pop | else:
|
942 | 9fbfbb7b | Iustin Pop | if units == 'h': |
943 | 9fbfbb7b | Iustin Pop | suffix = 'T'
|
944 | 9fbfbb7b | Iustin Pop | return "%0.1f%s" % (round(float(value) / 1024 / 1024, 1), suffix) |
945 | a8083063 | Iustin Pop | |
946 | a8083063 | Iustin Pop | |
947 | a8083063 | Iustin Pop | def ParseUnit(input_string): |
948 | a8083063 | Iustin Pop | """Tries to extract number and scale from the given string.
|
949 | a8083063 | Iustin Pop |
|
950 | 58885d79 | Iustin Pop | Input must be in the format C{NUMBER+ [DOT NUMBER+] SPACE*
|
951 | 58885d79 | Iustin Pop | [UNIT]}. If no unit is specified, it defaults to MiB. Return value
|
952 | 58885d79 | Iustin Pop | is always an int in MiB.
|
953 | a8083063 | Iustin Pop |
|
954 | a8083063 | Iustin Pop | """
|
955 | 9939547b | Iustin Pop | m = re.match('^([.\d]+)\s*([a-zA-Z]+)?$', str(input_string)) |
956 | a8083063 | Iustin Pop | if not m: |
957 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Invalid format") |
958 | a8083063 | Iustin Pop | |
959 | a8083063 | Iustin Pop | value = float(m.groups()[0]) |
960 | a8083063 | Iustin Pop | |
961 | a8083063 | Iustin Pop | unit = m.groups()[1]
|
962 | a8083063 | Iustin Pop | if unit:
|
963 | a8083063 | Iustin Pop | lcunit = unit.lower() |
964 | a8083063 | Iustin Pop | else:
|
965 | a8083063 | Iustin Pop | lcunit = 'm'
|
966 | a8083063 | Iustin Pop | |
967 | a8083063 | Iustin Pop | if lcunit in ('m', 'mb', 'mib'): |
968 | a8083063 | Iustin Pop | # Value already in MiB
|
969 | a8083063 | Iustin Pop | pass
|
970 | a8083063 | Iustin Pop | |
971 | a8083063 | Iustin Pop | elif lcunit in ('g', 'gb', 'gib'): |
972 | a8083063 | Iustin Pop | value *= 1024
|
973 | a8083063 | Iustin Pop | |
974 | a8083063 | Iustin Pop | elif lcunit in ('t', 'tb', 'tib'): |
975 | a8083063 | Iustin Pop | value *= 1024 * 1024 |
976 | a8083063 | Iustin Pop | |
977 | a8083063 | Iustin Pop | else:
|
978 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Unknown unit: %s" % unit) |
979 | a8083063 | Iustin Pop | |
980 | a8083063 | Iustin Pop | # Make sure we round up
|
981 | a8083063 | Iustin Pop | if int(value) < value: |
982 | a8083063 | Iustin Pop | value += 1
|
983 | a8083063 | Iustin Pop | |
984 | a8083063 | Iustin Pop | # Round up to the next multiple of 4
|
985 | a8083063 | Iustin Pop | value = int(value)
|
986 | a8083063 | Iustin Pop | if value % 4: |
987 | a8083063 | Iustin Pop | value += 4 - value % 4 |
988 | a8083063 | Iustin Pop | |
989 | a8083063 | Iustin Pop | return value
|
990 | a8083063 | Iustin Pop | |
991 | a8083063 | Iustin Pop | |
992 | a8083063 | Iustin Pop | def AddAuthorizedKey(file_name, key): |
993 | a8083063 | Iustin Pop | """Adds an SSH public key to an authorized_keys file.
|
994 | a8083063 | Iustin Pop |
|
995 | 58885d79 | Iustin Pop | @type file_name: str
|
996 | 58885d79 | Iustin Pop | @param file_name: path to authorized_keys file
|
997 | 58885d79 | Iustin Pop | @type key: str
|
998 | 58885d79 | Iustin Pop | @param key: string containing key
|
999 | 58885d79 | Iustin Pop |
|
1000 | a8083063 | Iustin Pop | """
|
1001 | a8083063 | Iustin Pop | key_fields = key.split() |
1002 | a8083063 | Iustin Pop | |
1003 | a8083063 | Iustin Pop | f = open(file_name, 'a+') |
1004 | a8083063 | Iustin Pop | try:
|
1005 | a8083063 | Iustin Pop | nl = True
|
1006 | a8083063 | Iustin Pop | for line in f: |
1007 | a8083063 | Iustin Pop | # Ignore whitespace changes
|
1008 | a8083063 | Iustin Pop | if line.split() == key_fields:
|
1009 | a8083063 | Iustin Pop | break
|
1010 | a8083063 | Iustin Pop | nl = line.endswith('\n')
|
1011 | a8083063 | Iustin Pop | else:
|
1012 | a8083063 | Iustin Pop | if not nl: |
1013 | a8083063 | Iustin Pop | f.write("\n")
|
1014 | a8083063 | Iustin Pop | f.write(key.rstrip('\r\n'))
|
1015 | a8083063 | Iustin Pop | f.write("\n")
|
1016 | a8083063 | Iustin Pop | f.flush() |
1017 | a8083063 | Iustin Pop | finally:
|
1018 | a8083063 | Iustin Pop | f.close() |
1019 | a8083063 | Iustin Pop | |
1020 | a8083063 | Iustin Pop | |
1021 | a8083063 | Iustin Pop | def RemoveAuthorizedKey(file_name, key): |
1022 | a8083063 | Iustin Pop | """Removes an SSH public key from an authorized_keys file.
|
1023 | a8083063 | Iustin Pop |
|
1024 | 58885d79 | Iustin Pop | @type file_name: str
|
1025 | 58885d79 | Iustin Pop | @param file_name: path to authorized_keys file
|
1026 | 58885d79 | Iustin Pop | @type key: str
|
1027 | 58885d79 | Iustin Pop | @param key: string containing key
|
1028 | 58885d79 | Iustin Pop |
|
1029 | a8083063 | Iustin Pop | """
|
1030 | a8083063 | Iustin Pop | key_fields = key.split() |
1031 | a8083063 | Iustin Pop | |
1032 | a8083063 | Iustin Pop | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
1033 | a8083063 | Iustin Pop | try:
|
1034 | 59f82e3f | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
1035 | a8083063 | Iustin Pop | try:
|
1036 | 59f82e3f | Michael Hanselmann | f = open(file_name, 'r') |
1037 | 59f82e3f | Michael Hanselmann | try:
|
1038 | 59f82e3f | Michael Hanselmann | for line in f: |
1039 | 59f82e3f | Michael Hanselmann | # Ignore whitespace changes while comparing lines
|
1040 | 59f82e3f | Michael Hanselmann | if line.split() != key_fields:
|
1041 | 59f82e3f | Michael Hanselmann | out.write(line) |
1042 | 899d2a81 | Michael Hanselmann | |
1043 | 899d2a81 | Michael Hanselmann | out.flush() |
1044 | 899d2a81 | Michael Hanselmann | os.rename(tmpname, file_name) |
1045 | 899d2a81 | Michael Hanselmann | finally:
|
1046 | 899d2a81 | Michael Hanselmann | f.close() |
1047 | 899d2a81 | Michael Hanselmann | finally:
|
1048 | 899d2a81 | Michael Hanselmann | out.close() |
1049 | 899d2a81 | Michael Hanselmann | except:
|
1050 | 899d2a81 | Michael Hanselmann | RemoveFile(tmpname) |
1051 | 899d2a81 | Michael Hanselmann | raise
|
1052 | 899d2a81 | Michael Hanselmann | |
1053 | 899d2a81 | Michael Hanselmann | |
1054 | 9440aeab | Michael Hanselmann | def SetEtcHostsEntry(file_name, ip, hostname, aliases): |
1055 | 9440aeab | Michael Hanselmann | """Sets the name of an IP address and hostname in /etc/hosts.
|
1056 | 899d2a81 | Michael Hanselmann |
|
1057 | 58885d79 | Iustin Pop | @type file_name: str
|
1058 | 58885d79 | Iustin Pop | @param file_name: path to the file to modify (usually C{/etc/hosts})
|
1059 | 58885d79 | Iustin Pop | @type ip: str
|
1060 | 58885d79 | Iustin Pop | @param ip: the IP address
|
1061 | 58885d79 | Iustin Pop | @type hostname: str
|
1062 | 58885d79 | Iustin Pop | @param hostname: the hostname to be added
|
1063 | 58885d79 | Iustin Pop | @type aliases: list
|
1064 | 58885d79 | Iustin Pop | @param aliases: the list of aliases to add for the hostname
|
1065 | 58885d79 | Iustin Pop |
|
1066 | 899d2a81 | Michael Hanselmann | """
|
1067 | 9b977740 | Guido Trotter | # FIXME: use WriteFile + fn rather than duplicating its efforts
|
1068 | 7fbb1f65 | Michael Hanselmann | # Ensure aliases are unique
|
1069 | 7fbb1f65 | Michael Hanselmann | aliases = UniqueSequence([hostname] + aliases)[1:]
|
1070 | 7fbb1f65 | Michael Hanselmann | |
1071 | 9440aeab | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
1072 | 899d2a81 | Michael Hanselmann | try:
|
1073 | 9440aeab | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
1074 | 9440aeab | Michael Hanselmann | try:
|
1075 | 9440aeab | Michael Hanselmann | f = open(file_name, 'r') |
1076 | 9440aeab | Michael Hanselmann | try:
|
1077 | 9440aeab | Michael Hanselmann | for line in f: |
1078 | 9440aeab | Michael Hanselmann | fields = line.split() |
1079 | 7e3dbb94 | Iustin Pop | if fields and not fields[0].startswith('#') and ip == fields[0]: |
1080 | 9440aeab | Michael Hanselmann | continue
|
1081 | 9440aeab | Michael Hanselmann | out.write(line) |
1082 | 9440aeab | Michael Hanselmann | |
1083 | 7e3dbb94 | Iustin Pop | out.write("%s\t%s" % (ip, hostname))
|
1084 | 9440aeab | Michael Hanselmann | if aliases:
|
1085 | 9440aeab | Michael Hanselmann | out.write(" %s" % ' '.join(aliases)) |
1086 | 9440aeab | Michael Hanselmann | out.write('\n')
|
1087 | 9440aeab | Michael Hanselmann | |
1088 | 9440aeab | Michael Hanselmann | out.flush() |
1089 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
1090 | 9b977740 | Guido Trotter | os.chmod(tmpname, 0644)
|
1091 | 9440aeab | Michael Hanselmann | os.rename(tmpname, file_name) |
1092 | 9440aeab | Michael Hanselmann | finally:
|
1093 | 9440aeab | Michael Hanselmann | f.close() |
1094 | 9440aeab | Michael Hanselmann | finally:
|
1095 | 9440aeab | Michael Hanselmann | out.close() |
1096 | 9440aeab | Michael Hanselmann | except:
|
1097 | 9440aeab | Michael Hanselmann | RemoveFile(tmpname) |
1098 | 9440aeab | Michael Hanselmann | raise
|
1099 | 899d2a81 | Michael Hanselmann | |
1100 | 899d2a81 | Michael Hanselmann | |
1101 | d9c02ca6 | Michael Hanselmann | def AddHostToEtcHosts(hostname): |
1102 | d9c02ca6 | Michael Hanselmann | """Wrapper around SetEtcHostsEntry.
|
1103 | d9c02ca6 | Michael Hanselmann |
|
1104 | 58885d79 | Iustin Pop | @type hostname: str
|
1105 | 58885d79 | Iustin Pop | @param hostname: a hostname that will be resolved and added to
|
1106 | 58885d79 | Iustin Pop | L{constants.ETC_HOSTS}
|
1107 | 58885d79 | Iustin Pop |
|
1108 | d9c02ca6 | Michael Hanselmann | """
|
1109 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
1110 | d9c02ca6 | Michael Hanselmann | SetEtcHostsEntry(constants.ETC_HOSTS, hi.ip, hi.name, [hi.ShortName()]) |
1111 | d9c02ca6 | Michael Hanselmann | |
1112 | d9c02ca6 | Michael Hanselmann | |
1113 | 899d2a81 | Michael Hanselmann | def RemoveEtcHostsEntry(file_name, hostname): |
1114 | 3e1cdf9f | Michael Hanselmann | """Removes a hostname from /etc/hosts.
|
1115 | 899d2a81 | Michael Hanselmann |
|
1116 | 9440aeab | Michael Hanselmann | IP addresses without names are removed from the file.
|
1117 | 58885d79 | Iustin Pop |
|
1118 | 58885d79 | Iustin Pop | @type file_name: str
|
1119 | 58885d79 | Iustin Pop | @param file_name: path to the file to modify (usually C{/etc/hosts})
|
1120 | 58885d79 | Iustin Pop | @type hostname: str
|
1121 | 58885d79 | Iustin Pop | @param hostname: the hostname to be removed
|
1122 | 58885d79 | Iustin Pop |
|
1123 | 899d2a81 | Michael Hanselmann | """
|
1124 | 9b977740 | Guido Trotter | # FIXME: use WriteFile + fn rather than duplicating its efforts
|
1125 | 899d2a81 | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
1126 | 899d2a81 | Michael Hanselmann | try:
|
1127 | 899d2a81 | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
1128 | 899d2a81 | Michael Hanselmann | try:
|
1129 | 899d2a81 | Michael Hanselmann | f = open(file_name, 'r') |
1130 | 899d2a81 | Michael Hanselmann | try:
|
1131 | 899d2a81 | Michael Hanselmann | for line in f: |
1132 | 899d2a81 | Michael Hanselmann | fields = line.split() |
1133 | 899d2a81 | Michael Hanselmann | if len(fields) > 1 and not fields[0].startswith('#'): |
1134 | 899d2a81 | Michael Hanselmann | names = fields[1:]
|
1135 | 899d2a81 | Michael Hanselmann | if hostname in names: |
1136 | 899d2a81 | Michael Hanselmann | while hostname in names: |
1137 | 899d2a81 | Michael Hanselmann | names.remove(hostname) |
1138 | 899d2a81 | Michael Hanselmann | if names:
|
1139 | 9440aeab | Michael Hanselmann | out.write("%s %s\n" % (fields[0], ' '.join(names))) |
1140 | 899d2a81 | Michael Hanselmann | continue
|
1141 | 899d2a81 | Michael Hanselmann | |
1142 | 899d2a81 | Michael Hanselmann | out.write(line) |
1143 | 59f82e3f | Michael Hanselmann | |
1144 | 59f82e3f | Michael Hanselmann | out.flush() |
1145 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
1146 | 9b977740 | Guido Trotter | os.chmod(tmpname, 0644)
|
1147 | 59f82e3f | Michael Hanselmann | os.rename(tmpname, file_name) |
1148 | 59f82e3f | Michael Hanselmann | finally:
|
1149 | 59f82e3f | Michael Hanselmann | f.close() |
1150 | a8083063 | Iustin Pop | finally:
|
1151 | 59f82e3f | Michael Hanselmann | out.close() |
1152 | 59f82e3f | Michael Hanselmann | except:
|
1153 | 59f82e3f | Michael Hanselmann | RemoveFile(tmpname) |
1154 | 59f82e3f | Michael Hanselmann | raise
|
1155 | a8083063 | Iustin Pop | |
1156 | a8083063 | Iustin Pop | |
1157 | d9c02ca6 | Michael Hanselmann | def RemoveHostFromEtcHosts(hostname): |
1158 | d9c02ca6 | Michael Hanselmann | """Wrapper around RemoveEtcHostsEntry.
|
1159 | d9c02ca6 | Michael Hanselmann |
|
1160 | 58885d79 | Iustin Pop | @type hostname: str
|
1161 | 58885d79 | Iustin Pop | @param hostname: hostname that will be resolved and its
|
1162 | 58885d79 | Iustin Pop | full and shot name will be removed from
|
1163 | 58885d79 | Iustin Pop | L{constants.ETC_HOSTS}
|
1164 | 58885d79 | Iustin Pop |
|
1165 | d9c02ca6 | Michael Hanselmann | """
|
1166 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
1167 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.name) |
1168 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.ShortName()) |
1169 | d9c02ca6 | Michael Hanselmann | |
1170 | d9c02ca6 | Michael Hanselmann | |
1171 | 1d466a4f | Michael Hanselmann | def TimestampForFilename(): |
1172 | 1d466a4f | Michael Hanselmann | """Returns the current time formatted for filenames.
|
1173 | 1d466a4f | Michael Hanselmann |
|
1174 | 1d466a4f | Michael Hanselmann | The format doesn't contain colons as some shells and applications them as
|
1175 | 1d466a4f | Michael Hanselmann | separators.
|
1176 | 1d466a4f | Michael Hanselmann |
|
1177 | 1d466a4f | Michael Hanselmann | """
|
1178 | 1d466a4f | Michael Hanselmann | return time.strftime("%Y-%m-%d_%H_%M_%S") |
1179 | 1d466a4f | Michael Hanselmann | |
1180 | 1d466a4f | Michael Hanselmann | |
1181 | a8083063 | Iustin Pop | def CreateBackup(file_name): |
1182 | a8083063 | Iustin Pop | """Creates a backup of a file.
|
1183 | a8083063 | Iustin Pop |
|
1184 | 58885d79 | Iustin Pop | @type file_name: str
|
1185 | 58885d79 | Iustin Pop | @param file_name: file to be backed up
|
1186 | 58885d79 | Iustin Pop | @rtype: str
|
1187 | 58885d79 | Iustin Pop | @return: the path to the newly created backup
|
1188 | 58885d79 | Iustin Pop | @raise errors.ProgrammerError: for invalid file names
|
1189 | a8083063 | Iustin Pop |
|
1190 | a8083063 | Iustin Pop | """
|
1191 | a8083063 | Iustin Pop | if not os.path.isfile(file_name): |
1192 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Can't make a backup of a non-file '%s'" % |
1193 | 3ecf6786 | Iustin Pop | file_name) |
1194 | a8083063 | Iustin Pop | |
1195 | 1d466a4f | Michael Hanselmann | prefix = ("%s.backup-%s." %
|
1196 | 1d466a4f | Michael Hanselmann | (os.path.basename(file_name), TimestampForFilename())) |
1197 | 65fe4693 | Iustin Pop | dir_name = os.path.dirname(file_name) |
1198 | 081b1e69 | Michael Hanselmann | |
1199 | 081b1e69 | Michael Hanselmann | fsrc = open(file_name, 'rb') |
1200 | 081b1e69 | Michael Hanselmann | try:
|
1201 | 65fe4693 | Iustin Pop | (fd, backup_name) = tempfile.mkstemp(prefix=prefix, dir=dir_name) |
1202 | 081b1e69 | Michael Hanselmann | fdst = os.fdopen(fd, 'wb')
|
1203 | 081b1e69 | Michael Hanselmann | try:
|
1204 | 1d466a4f | Michael Hanselmann | logging.debug("Backing up %s at %s", file_name, backup_name)
|
1205 | 081b1e69 | Michael Hanselmann | shutil.copyfileobj(fsrc, fdst) |
1206 | 081b1e69 | Michael Hanselmann | finally:
|
1207 | 081b1e69 | Michael Hanselmann | fdst.close() |
1208 | 081b1e69 | Michael Hanselmann | finally:
|
1209 | 081b1e69 | Michael Hanselmann | fsrc.close() |
1210 | 081b1e69 | Michael Hanselmann | |
1211 | a8083063 | Iustin Pop | return backup_name
|
1212 | a8083063 | Iustin Pop | |
1213 | a8083063 | Iustin Pop | |
1214 | a8083063 | Iustin Pop | def ShellQuote(value): |
1215 | a8083063 | Iustin Pop | """Quotes shell argument according to POSIX.
|
1216 | 3ecf6786 | Iustin Pop |
|
1217 | 58885d79 | Iustin Pop | @type value: str
|
1218 | 58885d79 | Iustin Pop | @param value: the argument to be quoted
|
1219 | 58885d79 | Iustin Pop | @rtype: str
|
1220 | 58885d79 | Iustin Pop | @return: the quoted value
|
1221 | 58885d79 | Iustin Pop |
|
1222 | a8083063 | Iustin Pop | """
|
1223 | a8083063 | Iustin Pop | if _re_shell_unquoted.match(value):
|
1224 | a8083063 | Iustin Pop | return value
|
1225 | a8083063 | Iustin Pop | else:
|
1226 | a8083063 | Iustin Pop | return "'%s'" % value.replace("'", "'\\''") |
1227 | a8083063 | Iustin Pop | |
1228 | a8083063 | Iustin Pop | |
1229 | a8083063 | Iustin Pop | def ShellQuoteArgs(args): |
1230 | 58885d79 | Iustin Pop | """Quotes a list of shell arguments.
|
1231 | 58885d79 | Iustin Pop |
|
1232 | 58885d79 | Iustin Pop | @type args: list
|
1233 | 58885d79 | Iustin Pop | @param args: list of arguments to be quoted
|
1234 | 58885d79 | Iustin Pop | @rtype: str
|
1235 | 5bbd3f7f | Michael Hanselmann | @return: the quoted arguments concatenated with spaces
|
1236 | a8083063 | Iustin Pop |
|
1237 | a8083063 | Iustin Pop | """
|
1238 | a8083063 | Iustin Pop | return ' '.join([ShellQuote(i) for i in args]) |
1239 | 88d14415 | Michael Hanselmann | |
1240 | 88d14415 | Michael Hanselmann | |
1241 | b15d625f | Iustin Pop | def TcpPing(target, port, timeout=10, live_port_needed=False, source=None): |
1242 | 2c30e9d7 | Alexander Schreiber | """Simple ping implementation using TCP connect(2).
|
1243 | 2c30e9d7 | Alexander Schreiber |
|
1244 | 58885d79 | Iustin Pop | Check if the given IP is reachable by doing attempting a TCP connect
|
1245 | 58885d79 | Iustin Pop | to it.
|
1246 | 58885d79 | Iustin Pop |
|
1247 | 58885d79 | Iustin Pop | @type target: str
|
1248 | 58885d79 | Iustin Pop | @param target: the IP or hostname to ping
|
1249 | 58885d79 | Iustin Pop | @type port: int
|
1250 | 58885d79 | Iustin Pop | @param port: the port to connect to
|
1251 | 58885d79 | Iustin Pop | @type timeout: int
|
1252 | 5bbd3f7f | Michael Hanselmann | @param timeout: the timeout on the connection attempt
|
1253 | 58885d79 | Iustin Pop | @type live_port_needed: boolean
|
1254 | 58885d79 | Iustin Pop | @param live_port_needed: whether a closed port will cause the
|
1255 | 58885d79 | Iustin Pop | function to return failure, as if there was a timeout
|
1256 | 58885d79 | Iustin Pop | @type source: str or None
|
1257 | 58885d79 | Iustin Pop | @param source: if specified, will cause the connect to be made
|
1258 | 58885d79 | Iustin Pop | from this specific source address; failures to bind other
|
1259 | 58885d79 | Iustin Pop | than C{EADDRNOTAVAIL} will be ignored
|
1260 | 2c30e9d7 | Alexander Schreiber |
|
1261 | 2c30e9d7 | Alexander Schreiber | """
|
1262 | 2c30e9d7 | Alexander Schreiber | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
1263 | 2c30e9d7 | Alexander Schreiber | |
1264 | 0b5ad33e | Iustin Pop | success = False
|
1265 | 2c30e9d7 | Alexander Schreiber | |
1266 | b15d625f | Iustin Pop | if source is not None: |
1267 | b15d625f | Iustin Pop | try:
|
1268 | b15d625f | Iustin Pop | sock.bind((source, 0))
|
1269 | 7c4d6c7b | Michael Hanselmann | except socket.error, (errcode, _):
|
1270 | b15d625f | Iustin Pop | if errcode == errno.EADDRNOTAVAIL:
|
1271 | b15d625f | Iustin Pop | success = False
|
1272 | 2c30e9d7 | Alexander Schreiber | |
1273 | 2c30e9d7 | Alexander Schreiber | sock.settimeout(timeout) |
1274 | 2c30e9d7 | Alexander Schreiber | |
1275 | 2c30e9d7 | Alexander Schreiber | try:
|
1276 | 2c30e9d7 | Alexander Schreiber | sock.connect((target, port)) |
1277 | 2c30e9d7 | Alexander Schreiber | sock.close() |
1278 | 2c30e9d7 | Alexander Schreiber | success = True
|
1279 | 2c30e9d7 | Alexander Schreiber | except socket.timeout:
|
1280 | 2c30e9d7 | Alexander Schreiber | success = False
|
1281 | 099c52ad | Iustin Pop | except socket.error, (errcode, _):
|
1282 | 4ca1b175 | Alexander Schreiber | success = (not live_port_needed) and (errcode == errno.ECONNREFUSED) |
1283 | 2c30e9d7 | Alexander Schreiber | |
1284 | 2c30e9d7 | Alexander Schreiber | return success
|
1285 | eedbda4b | Michael Hanselmann | |
1286 | eedbda4b | Michael Hanselmann | |
1287 | caad16e2 | Iustin Pop | def OwnIpAddress(address): |
1288 | caad16e2 | Iustin Pop | """Check if the current host has the the given IP address.
|
1289 | caad16e2 | Iustin Pop |
|
1290 | 58885d79 | Iustin Pop | Currently this is done by TCP-pinging the address from the loopback
|
1291 | caad16e2 | Iustin Pop | address.
|
1292 | caad16e2 | Iustin Pop |
|
1293 | caad16e2 | Iustin Pop | @type address: string
|
1294 | 5bbd3f7f | Michael Hanselmann | @param address: the address to check
|
1295 | caad16e2 | Iustin Pop | @rtype: bool
|
1296 | 58885d79 | Iustin Pop | @return: True if we own the address
|
1297 | caad16e2 | Iustin Pop |
|
1298 | caad16e2 | Iustin Pop | """
|
1299 | caad16e2 | Iustin Pop | return TcpPing(address, constants.DEFAULT_NODED_PORT,
|
1300 | caad16e2 | Iustin Pop | source=constants.LOCALHOST_IP_ADDRESS) |
1301 | caad16e2 | Iustin Pop | |
1302 | caad16e2 | Iustin Pop | |
1303 | eedbda4b | Michael Hanselmann | def ListVisibleFiles(path): |
1304 | 58885d79 | Iustin Pop | """Returns a list of visible files in a directory.
|
1305 | 58885d79 | Iustin Pop |
|
1306 | 58885d79 | Iustin Pop | @type path: str
|
1307 | 58885d79 | Iustin Pop | @param path: the directory to enumerate
|
1308 | 58885d79 | Iustin Pop | @rtype: list
|
1309 | 58885d79 | Iustin Pop | @return: the list of all files not starting with a dot
|
1310 | 04a69a18 | Iustin Pop | @raise ProgrammerError: if L{path} is not an absolue and normalized path
|
1311 | eedbda4b | Michael Hanselmann |
|
1312 | eedbda4b | Michael Hanselmann | """
|
1313 | 04a69a18 | Iustin Pop | if not IsNormAbsPath(path): |
1314 | 04a69a18 | Iustin Pop | raise errors.ProgrammerError("Path passed to ListVisibleFiles is not" |
1315 | 04a69a18 | Iustin Pop | " absolute/normalized: '%s'" % path)
|
1316 | f3299a07 | Michael Hanselmann | files = [i for i in os.listdir(path) if not i.startswith(".")] |
1317 | f3299a07 | Michael Hanselmann | files.sort() |
1318 | f3299a07 | Michael Hanselmann | return files
|
1319 | 2f8b60b3 | Iustin Pop | |
1320 | 2f8b60b3 | Iustin Pop | |
1321 | 257f4c0a | Iustin Pop | def GetHomeDir(user, default=None): |
1322 | 257f4c0a | Iustin Pop | """Try to get the homedir of the given user.
|
1323 | 257f4c0a | Iustin Pop |
|
1324 | 257f4c0a | Iustin Pop | The user can be passed either as a string (denoting the name) or as
|
1325 | 257f4c0a | Iustin Pop | an integer (denoting the user id). If the user is not found, the
|
1326 | 257f4c0a | Iustin Pop | 'default' argument is returned, which defaults to None.
|
1327 | 2f8b60b3 | Iustin Pop |
|
1328 | 2f8b60b3 | Iustin Pop | """
|
1329 | 2f8b60b3 | Iustin Pop | try:
|
1330 | 257f4c0a | Iustin Pop | if isinstance(user, basestring): |
1331 | 257f4c0a | Iustin Pop | result = pwd.getpwnam(user) |
1332 | 257f4c0a | Iustin Pop | elif isinstance(user, (int, long)): |
1333 | 257f4c0a | Iustin Pop | result = pwd.getpwuid(user) |
1334 | 257f4c0a | Iustin Pop | else:
|
1335 | 257f4c0a | Iustin Pop | raise errors.ProgrammerError("Invalid type passed to GetHomeDir (%s)" % |
1336 | 257f4c0a | Iustin Pop | type(user))
|
1337 | 2f8b60b3 | Iustin Pop | except KeyError: |
1338 | 2f8b60b3 | Iustin Pop | return default
|
1339 | 2f8b60b3 | Iustin Pop | return result.pw_dir
|
1340 | 59072e7e | Michael Hanselmann | |
1341 | 59072e7e | Michael Hanselmann | |
1342 | 24818e8f | Michael Hanselmann | def NewUUID(): |
1343 | 59072e7e | Michael Hanselmann | """Returns a random UUID.
|
1344 | 59072e7e | Michael Hanselmann |
|
1345 | 58885d79 | Iustin Pop | @note: This is a Linux-specific method as it uses the /proc
|
1346 | 58885d79 | Iustin Pop | filesystem.
|
1347 | 58885d79 | Iustin Pop | @rtype: str
|
1348 | 58885d79 | Iustin Pop |
|
1349 | 59072e7e | Michael Hanselmann | """
|
1350 | 13998ef2 | Michael Hanselmann | return ReadFile(_RANDOM_UUID_FILE, size=128).rstrip("\n") |
1351 | 087b34fe | Iustin Pop | |
1352 | 087b34fe | Iustin Pop | |
1353 | ec2c2bc4 | Luca Bigliardi | def GenerateSecret(numbytes=20): |
1354 | 33081d90 | Iustin Pop | """Generates a random secret.
|
1355 | 33081d90 | Iustin Pop |
|
1356 | ec2c2bc4 | Luca Bigliardi | This will generate a pseudo-random secret returning an hex string
|
1357 | 33081d90 | Iustin Pop | (so that it can be used where an ASCII string is needed).
|
1358 | 33081d90 | Iustin Pop |
|
1359 | ec2c2bc4 | Luca Bigliardi | @param numbytes: the number of bytes which will be represented by the returned
|
1360 | ec2c2bc4 | Luca Bigliardi | string (defaulting to 20, the length of a SHA1 hash)
|
1361 | 58885d79 | Iustin Pop | @rtype: str
|
1362 | ec2c2bc4 | Luca Bigliardi | @return: an hex representation of the pseudo-random sequence
|
1363 | 58885d79 | Iustin Pop |
|
1364 | 33081d90 | Iustin Pop | """
|
1365 | ec2c2bc4 | Luca Bigliardi | return os.urandom(numbytes).encode('hex') |
1366 | 33081d90 | Iustin Pop | |
1367 | 33081d90 | Iustin Pop | |
1368 | 9dae41ad | Guido Trotter | def EnsureDirs(dirs): |
1369 | 9dae41ad | Guido Trotter | """Make required directories, if they don't exist.
|
1370 | 9dae41ad | Guido Trotter |
|
1371 | 9dae41ad | Guido Trotter | @param dirs: list of tuples (dir_name, dir_mode)
|
1372 | 9dae41ad | Guido Trotter | @type dirs: list of (string, integer)
|
1373 | 9dae41ad | Guido Trotter |
|
1374 | 9dae41ad | Guido Trotter | """
|
1375 | 9dae41ad | Guido Trotter | for dir_name, dir_mode in dirs: |
1376 | 9dae41ad | Guido Trotter | try:
|
1377 | 1b2c8f85 | Iustin Pop | os.mkdir(dir_name, dir_mode) |
1378 | 9dae41ad | Guido Trotter | except EnvironmentError, err: |
1379 | 9dae41ad | Guido Trotter | if err.errno != errno.EEXIST:
|
1380 | 9dae41ad | Guido Trotter | raise errors.GenericError("Cannot create needed directory" |
1381 | 1b2c8f85 | Iustin Pop | " '%s': %s" % (dir_name, err))
|
1382 | 9dae41ad | Guido Trotter | if not os.path.isdir(dir_name): |
1383 | 9dae41ad | Guido Trotter | raise errors.GenericError("%s is not a directory" % dir_name) |
1384 | 9dae41ad | Guido Trotter | |
1385 | 9dae41ad | Guido Trotter | |
1386 | 582ed043 | Guido Trotter | def ReadFile(file_name, size=-1): |
1387 | ca0aa6d0 | Michael Hanselmann | """Reads a file.
|
1388 | ca0aa6d0 | Michael Hanselmann |
|
1389 | 016308cb | Iustin Pop | @type size: int
|
1390 | 016308cb | Iustin Pop | @param size: Read at most size bytes (if negative, entire file)
|
1391 | 58885d79 | Iustin Pop | @rtype: str
|
1392 | 5bbd3f7f | Michael Hanselmann | @return: the (possibly partial) content of the file
|
1393 | ca0aa6d0 | Michael Hanselmann |
|
1394 | ca0aa6d0 | Michael Hanselmann | """
|
1395 | ca0aa6d0 | Michael Hanselmann | f = open(file_name, "r") |
1396 | ca0aa6d0 | Michael Hanselmann | try:
|
1397 | 582ed043 | Guido Trotter | return f.read(size)
|
1398 | ca0aa6d0 | Michael Hanselmann | finally:
|
1399 | ca0aa6d0 | Michael Hanselmann | f.close() |
1400 | ca0aa6d0 | Michael Hanselmann | |
1401 | ca0aa6d0 | Michael Hanselmann | |
1402 | 087b34fe | Iustin Pop | def WriteFile(file_name, fn=None, data=None, |
1403 | 087b34fe | Iustin Pop | mode=None, uid=-1, gid=-1, |
1404 | 71714516 | Michael Hanselmann | atime=None, mtime=None, close=True, |
1405 | 04a8d789 | Michael Hanselmann | dry_run=False, backup=False, |
1406 | 71714516 | Michael Hanselmann | prewrite=None, postwrite=None): |
1407 | 087b34fe | Iustin Pop | """(Over)write a file atomically.
|
1408 | 087b34fe | Iustin Pop |
|
1409 | 087b34fe | Iustin Pop | The file_name and either fn (a function taking one argument, the
|
1410 | 087b34fe | Iustin Pop | file descriptor, and which should write the data to it) or data (the
|
1411 | 087b34fe | Iustin Pop | contents of the file) must be passed. The other arguments are
|
1412 | 087b34fe | Iustin Pop | optional and allow setting the file mode, owner and group, and the
|
1413 | 087b34fe | Iustin Pop | mtime/atime of the file.
|
1414 | 087b34fe | Iustin Pop |
|
1415 | 087b34fe | Iustin Pop | If the function doesn't raise an exception, it has succeeded and the
|
1416 | 69efe319 | Michael Hanselmann | target file has the new contents. If the function has raised an
|
1417 | 087b34fe | Iustin Pop | exception, an existing target file should be unmodified and the
|
1418 | 087b34fe | Iustin Pop | temporary file should be removed.
|
1419 | 087b34fe | Iustin Pop |
|
1420 | 58885d79 | Iustin Pop | @type file_name: str
|
1421 | 58885d79 | Iustin Pop | @param file_name: the target filename
|
1422 | 58885d79 | Iustin Pop | @type fn: callable
|
1423 | 58885d79 | Iustin Pop | @param fn: content writing function, called with
|
1424 | 58885d79 | Iustin Pop | file descriptor as parameter
|
1425 | 69efe319 | Michael Hanselmann | @type data: str
|
1426 | 58885d79 | Iustin Pop | @param data: contents of the file
|
1427 | 58885d79 | Iustin Pop | @type mode: int
|
1428 | 58885d79 | Iustin Pop | @param mode: file mode
|
1429 | 58885d79 | Iustin Pop | @type uid: int
|
1430 | 58885d79 | Iustin Pop | @param uid: the owner of the file
|
1431 | 58885d79 | Iustin Pop | @type gid: int
|
1432 | 58885d79 | Iustin Pop | @param gid: the group of the file
|
1433 | 58885d79 | Iustin Pop | @type atime: int
|
1434 | 58885d79 | Iustin Pop | @param atime: a custom access time to be set on the file
|
1435 | 58885d79 | Iustin Pop | @type mtime: int
|
1436 | 58885d79 | Iustin Pop | @param mtime: a custom modification time to be set on the file
|
1437 | 58885d79 | Iustin Pop | @type close: boolean
|
1438 | 58885d79 | Iustin Pop | @param close: whether to close file after writing it
|
1439 | 58885d79 | Iustin Pop | @type prewrite: callable
|
1440 | 58885d79 | Iustin Pop | @param prewrite: function to be called before writing content
|
1441 | 58885d79 | Iustin Pop | @type postwrite: callable
|
1442 | 58885d79 | Iustin Pop | @param postwrite: function to be called after writing content
|
1443 | 58885d79 | Iustin Pop |
|
1444 | 58885d79 | Iustin Pop | @rtype: None or int
|
1445 | 58885d79 | Iustin Pop | @return: None if the 'close' parameter evaluates to True,
|
1446 | 58885d79 | Iustin Pop | otherwise the file descriptor
|
1447 | 58885d79 | Iustin Pop |
|
1448 | 69efe319 | Michael Hanselmann | @raise errors.ProgrammerError: if any of the arguments are not valid
|
1449 | 71714516 | Michael Hanselmann |
|
1450 | 087b34fe | Iustin Pop | """
|
1451 | 04a8d789 | Michael Hanselmann | if not os.path.isabs(file_name): |
1452 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Path passed to WriteFile is not" |
1453 | 087b34fe | Iustin Pop | " absolute: '%s'" % file_name)
|
1454 | 087b34fe | Iustin Pop | |
1455 | 087b34fe | Iustin Pop | if [fn, data].count(None) != 1: |
1456 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("fn or data required") |
1457 | 087b34fe | Iustin Pop | |
1458 | 087b34fe | Iustin Pop | if [atime, mtime].count(None) == 1: |
1459 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Both atime and mtime must be either" |
1460 | 087b34fe | Iustin Pop | " set or None")
|
1461 | 087b34fe | Iustin Pop | |
1462 | 70f4497c | Michael Hanselmann | if backup and not dry_run and os.path.isfile(file_name): |
1463 | 70f4497c | Michael Hanselmann | CreateBackup(file_name) |
1464 | 087b34fe | Iustin Pop | |
1465 | 087b34fe | Iustin Pop | dir_name, base_name = os.path.split(file_name) |
1466 | 087b34fe | Iustin Pop | fd, new_name = tempfile.mkstemp('.new', base_name, dir_name)
|
1467 | 81b7354c | Iustin Pop | do_remove = True
|
1468 | 087b34fe | Iustin Pop | # here we need to make sure we remove the temp file, if any error
|
1469 | 087b34fe | Iustin Pop | # leaves it in place
|
1470 | 087b34fe | Iustin Pop | try:
|
1471 | 087b34fe | Iustin Pop | if uid != -1 or gid != -1: |
1472 | 087b34fe | Iustin Pop | os.chown(new_name, uid, gid) |
1473 | 087b34fe | Iustin Pop | if mode:
|
1474 | 087b34fe | Iustin Pop | os.chmod(new_name, mode) |
1475 | 71714516 | Michael Hanselmann | if callable(prewrite): |
1476 | 71714516 | Michael Hanselmann | prewrite(fd) |
1477 | 087b34fe | Iustin Pop | if data is not None: |
1478 | 087b34fe | Iustin Pop | os.write(fd, data) |
1479 | 087b34fe | Iustin Pop | else:
|
1480 | 087b34fe | Iustin Pop | fn(fd) |
1481 | 71714516 | Michael Hanselmann | if callable(postwrite): |
1482 | 71714516 | Michael Hanselmann | postwrite(fd) |
1483 | 087b34fe | Iustin Pop | os.fsync(fd) |
1484 | 087b34fe | Iustin Pop | if atime is not None and mtime is not None: |
1485 | 087b34fe | Iustin Pop | os.utime(new_name, (atime, mtime)) |
1486 | 70f4497c | Michael Hanselmann | if not dry_run: |
1487 | 70f4497c | Michael Hanselmann | os.rename(new_name, file_name) |
1488 | 81b7354c | Iustin Pop | do_remove = False
|
1489 | 087b34fe | Iustin Pop | finally:
|
1490 | 71714516 | Michael Hanselmann | if close:
|
1491 | 71714516 | Michael Hanselmann | os.close(fd) |
1492 | 71714516 | Michael Hanselmann | result = None
|
1493 | 71714516 | Michael Hanselmann | else:
|
1494 | 71714516 | Michael Hanselmann | result = fd |
1495 | 81b7354c | Iustin Pop | if do_remove:
|
1496 | 81b7354c | Iustin Pop | RemoveFile(new_name) |
1497 | 78feb6fb | Guido Trotter | |
1498 | 71714516 | Michael Hanselmann | return result
|
1499 | 71714516 | Michael Hanselmann | |
1500 | 78feb6fb | Guido Trotter | |
1501 | e587b46a | Guido Trotter | def ReadOneLineFile(file_name, strict=False): |
1502 | e587b46a | Guido Trotter | """Return the first non-empty line from a file.
|
1503 | e587b46a | Guido Trotter |
|
1504 | e587b46a | Guido Trotter | @type strict: boolean
|
1505 | e587b46a | Guido Trotter | @param strict: if True, abort if the file has more than one
|
1506 | e587b46a | Guido Trotter | non-empty line
|
1507 | e587b46a | Guido Trotter |
|
1508 | e587b46a | Guido Trotter | """
|
1509 | e587b46a | Guido Trotter | file_lines = ReadFile(file_name).splitlines() |
1510 | e587b46a | Guido Trotter | full_lines = filter(bool, file_lines) |
1511 | e587b46a | Guido Trotter | if not file_lines or not full_lines: |
1512 | e587b46a | Guido Trotter | raise errors.GenericError("No data in one-liner file %s" % file_name) |
1513 | e587b46a | Guido Trotter | elif strict and len(full_lines) > 1: |
1514 | e587b46a | Guido Trotter | raise errors.GenericError("Too many lines in one-liner file %s" % |
1515 | e587b46a | Guido Trotter | file_name) |
1516 | e587b46a | Guido Trotter | return full_lines[0] |
1517 | e587b46a | Guido Trotter | |
1518 | e587b46a | Guido Trotter | |
1519 | 7b4126b7 | Iustin Pop | def FirstFree(seq, base=0): |
1520 | 7b4126b7 | Iustin Pop | """Returns the first non-existing integer from seq.
|
1521 | 7b4126b7 | Iustin Pop |
|
1522 | 7b4126b7 | Iustin Pop | The seq argument should be a sorted list of positive integers. The
|
1523 | 7b4126b7 | Iustin Pop | first time the index of an element is smaller than the element
|
1524 | 7b4126b7 | Iustin Pop | value, the index will be returned.
|
1525 | 7b4126b7 | Iustin Pop |
|
1526 | 7b4126b7 | Iustin Pop | The base argument is used to start at a different offset,
|
1527 | 58885d79 | Iustin Pop | i.e. C{[3, 4, 6]} with I{offset=3} will return 5.
|
1528 | 58885d79 | Iustin Pop |
|
1529 | 58885d79 | Iustin Pop | Example: C{[0, 1, 3]} will return I{2}.
|
1530 | 7b4126b7 | Iustin Pop |
|
1531 | 58885d79 | Iustin Pop | @type seq: sequence
|
1532 | 58885d79 | Iustin Pop | @param seq: the sequence to be analyzed.
|
1533 | 58885d79 | Iustin Pop | @type base: int
|
1534 | 58885d79 | Iustin Pop | @param base: use this value as the base index of the sequence
|
1535 | 58885d79 | Iustin Pop | @rtype: int
|
1536 | 58885d79 | Iustin Pop | @return: the first non-used index in the sequence
|
1537 | 7b4126b7 | Iustin Pop |
|
1538 | 7b4126b7 | Iustin Pop | """
|
1539 | 7b4126b7 | Iustin Pop | for idx, elem in enumerate(seq): |
1540 | 7b4126b7 | Iustin Pop | assert elem >= base, "Passed element is higher than base offset" |
1541 | 7b4126b7 | Iustin Pop | if elem > idx + base:
|
1542 | 7b4126b7 | Iustin Pop | # idx is not used
|
1543 | 7b4126b7 | Iustin Pop | return idx + base
|
1544 | 7b4126b7 | Iustin Pop | return None |
1545 | 7b4126b7 | Iustin Pop | |
1546 | 7b4126b7 | Iustin Pop | |
1547 | dfdc4060 | Guido Trotter | def SingleWaitForFdCondition(fdobj, event, timeout): |
1548 | dcd511c8 | Guido Trotter | """Waits for a condition to occur on the socket.
|
1549 | dcd511c8 | Guido Trotter |
|
1550 | dfdc4060 | Guido Trotter | Immediately returns at the first interruption.
|
1551 | dfdc4060 | Guido Trotter |
|
1552 | dfdc4060 | Guido Trotter | @type fdobj: integer or object supporting a fileno() method
|
1553 | dfdc4060 | Guido Trotter | @param fdobj: entity to wait for events on
|
1554 | dfdc4060 | Guido Trotter | @type event: integer
|
1555 | dcd511c8 | Guido Trotter | @param event: ORed condition (see select module)
|
1556 | dcd511c8 | Guido Trotter | @type timeout: float or None
|
1557 | dcd511c8 | Guido Trotter | @param timeout: Timeout in seconds
|
1558 | dcd511c8 | Guido Trotter | @rtype: int or None
|
1559 | dcd511c8 | Guido Trotter | @return: None for timeout, otherwise occured conditions
|
1560 | dcd511c8 | Guido Trotter |
|
1561 | dcd511c8 | Guido Trotter | """
|
1562 | dcd511c8 | Guido Trotter | check = (event | select.POLLPRI | |
1563 | dcd511c8 | Guido Trotter | select.POLLNVAL | select.POLLHUP | select.POLLERR) |
1564 | dcd511c8 | Guido Trotter | |
1565 | dcd511c8 | Guido Trotter | if timeout is not None: |
1566 | dcd511c8 | Guido Trotter | # Poller object expects milliseconds
|
1567 | dcd511c8 | Guido Trotter | timeout *= 1000
|
1568 | dcd511c8 | Guido Trotter | |
1569 | dcd511c8 | Guido Trotter | poller = select.poll() |
1570 | dfdc4060 | Guido Trotter | poller.register(fdobj, event) |
1571 | dcd511c8 | Guido Trotter | try:
|
1572 | dfdc4060 | Guido Trotter | # TODO: If the main thread receives a signal and we have no timeout, we
|
1573 | dfdc4060 | Guido Trotter | # could wait forever. This should check a global "quit" flag or something
|
1574 | dfdc4060 | Guido Trotter | # every so often.
|
1575 | dfdc4060 | Guido Trotter | io_events = poller.poll(timeout) |
1576 | dfdc4060 | Guido Trotter | except select.error, err:
|
1577 | dfdc4060 | Guido Trotter | if err[0] != errno.EINTR: |
1578 | dfdc4060 | Guido Trotter | raise
|
1579 | dfdc4060 | Guido Trotter | io_events = [] |
1580 | dfdc4060 | Guido Trotter | if io_events and io_events[0][1] & check: |
1581 | dfdc4060 | Guido Trotter | return io_events[0][1] |
1582 | dfdc4060 | Guido Trotter | else:
|
1583 | dfdc4060 | Guido Trotter | return None |
1584 | dfdc4060 | Guido Trotter | |
1585 | dfdc4060 | Guido Trotter | |
1586 | dfdc4060 | Guido Trotter | class FdConditionWaiterHelper(object): |
1587 | dfdc4060 | Guido Trotter | """Retry helper for WaitForFdCondition.
|
1588 | dfdc4060 | Guido Trotter |
|
1589 | dfdc4060 | Guido Trotter | This class contains the retried and wait functions that make sure
|
1590 | dfdc4060 | Guido Trotter | WaitForFdCondition can continue waiting until the timeout is actually
|
1591 | dfdc4060 | Guido Trotter | expired.
|
1592 | dfdc4060 | Guido Trotter |
|
1593 | dfdc4060 | Guido Trotter | """
|
1594 | dfdc4060 | Guido Trotter | |
1595 | dfdc4060 | Guido Trotter | def __init__(self, timeout): |
1596 | dfdc4060 | Guido Trotter | self.timeout = timeout
|
1597 | dfdc4060 | Guido Trotter | |
1598 | dfdc4060 | Guido Trotter | def Poll(self, fdobj, event): |
1599 | dfdc4060 | Guido Trotter | result = SingleWaitForFdCondition(fdobj, event, self.timeout)
|
1600 | dfdc4060 | Guido Trotter | if result is None: |
1601 | dfdc4060 | Guido Trotter | raise RetryAgain()
|
1602 | dfdc4060 | Guido Trotter | else:
|
1603 | dfdc4060 | Guido Trotter | return result
|
1604 | dfdc4060 | Guido Trotter | |
1605 | dfdc4060 | Guido Trotter | def UpdateTimeout(self, timeout): |
1606 | dfdc4060 | Guido Trotter | self.timeout = timeout
|
1607 | dfdc4060 | Guido Trotter | |
1608 | dfdc4060 | Guido Trotter | |
1609 | dfdc4060 | Guido Trotter | def WaitForFdCondition(fdobj, event, timeout): |
1610 | dfdc4060 | Guido Trotter | """Waits for a condition to occur on the socket.
|
1611 | dfdc4060 | Guido Trotter |
|
1612 | dfdc4060 | Guido Trotter | Retries until the timeout is expired, even if interrupted.
|
1613 | dfdc4060 | Guido Trotter |
|
1614 | dfdc4060 | Guido Trotter | @type fdobj: integer or object supporting a fileno() method
|
1615 | dfdc4060 | Guido Trotter | @param fdobj: entity to wait for events on
|
1616 | dfdc4060 | Guido Trotter | @type event: integer
|
1617 | dfdc4060 | Guido Trotter | @param event: ORed condition (see select module)
|
1618 | dfdc4060 | Guido Trotter | @type timeout: float or None
|
1619 | dfdc4060 | Guido Trotter | @param timeout: Timeout in seconds
|
1620 | dfdc4060 | Guido Trotter | @rtype: int or None
|
1621 | dfdc4060 | Guido Trotter | @return: None for timeout, otherwise occured conditions
|
1622 | dfdc4060 | Guido Trotter |
|
1623 | dfdc4060 | Guido Trotter | """
|
1624 | dfdc4060 | Guido Trotter | if timeout is not None: |
1625 | dfdc4060 | Guido Trotter | retrywaiter = FdConditionWaiterHelper(timeout) |
1626 | 1b429e2a | Iustin Pop | try:
|
1627 | 1b429e2a | Iustin Pop | result = Retry(retrywaiter.Poll, RETRY_REMAINING_TIME, timeout, |
1628 | 1b429e2a | Iustin Pop | args=(fdobj, event), wait_fn=retrywaiter.UpdateTimeout) |
1629 | 1b429e2a | Iustin Pop | except RetryTimeout:
|
1630 | 1b429e2a | Iustin Pop | result = None
|
1631 | dfdc4060 | Guido Trotter | else:
|
1632 | dfdc4060 | Guido Trotter | result = None
|
1633 | dfdc4060 | Guido Trotter | while result is None: |
1634 | dfdc4060 | Guido Trotter | result = SingleWaitForFdCondition(fdobj, event, timeout) |
1635 | dfdc4060 | Guido Trotter | return result
|
1636 | dcd511c8 | Guido Trotter | |
1637 | dcd511c8 | Guido Trotter | |
1638 | f7414041 | Michael Hanselmann | def UniqueSequence(seq): |
1639 | f7414041 | Michael Hanselmann | """Returns a list with unique elements.
|
1640 | f7414041 | Michael Hanselmann |
|
1641 | f7414041 | Michael Hanselmann | Element order is preserved.
|
1642 | 58885d79 | Iustin Pop |
|
1643 | 58885d79 | Iustin Pop | @type seq: sequence
|
1644 | 5bbd3f7f | Michael Hanselmann | @param seq: the sequence with the source elements
|
1645 | 58885d79 | Iustin Pop | @rtype: list
|
1646 | 58885d79 | Iustin Pop | @return: list of unique elements from seq
|
1647 | 58885d79 | Iustin Pop |
|
1648 | f7414041 | Michael Hanselmann | """
|
1649 | f7414041 | Michael Hanselmann | seen = set()
|
1650 | f7414041 | Michael Hanselmann | return [i for i in seq if i not in seen and not seen.add(i)] |
1651 | 1862d460 | Alexander Schreiber | |
1652 | 1862d460 | Alexander Schreiber | |
1653 | 82187135 | Renรฉ Nussbaumer | def NormalizeAndValidateMac(mac): |
1654 | 82187135 | Renรฉ Nussbaumer | """Normalizes and check if a MAC address is valid.
|
1655 | 1862d460 | Alexander Schreiber |
|
1656 | 5bbd3f7f | Michael Hanselmann | Checks whether the supplied MAC address is formally correct, only
|
1657 | 82187135 | Renรฉ Nussbaumer | accepts colon separated format. Normalize it to all lower.
|
1658 | 58885d79 | Iustin Pop |
|
1659 | 58885d79 | Iustin Pop | @type mac: str
|
1660 | 58885d79 | Iustin Pop | @param mac: the MAC to be validated
|
1661 | 82187135 | Renรฉ Nussbaumer | @rtype: str
|
1662 | 82187135 | Renรฉ Nussbaumer | @return: returns the normalized and validated MAC.
|
1663 | 82187135 | Renรฉ Nussbaumer |
|
1664 | 82187135 | Renรฉ Nussbaumer | @raise errors.OpPrereqError: If the MAC isn't valid
|
1665 | 58885d79 | Iustin Pop |
|
1666 | 1862d460 | Alexander Schreiber | """
|
1667 | 82187135 | Renรฉ Nussbaumer | mac_check = re.compile("^([0-9a-f]{2}(:|$)){6}$", re.I)
|
1668 | 82187135 | Renรฉ Nussbaumer | if not mac_check.match(mac): |
1669 | 82187135 | Renรฉ Nussbaumer | raise errors.OpPrereqError("Invalid MAC address specified: %s" % |
1670 | 82187135 | Renรฉ Nussbaumer | mac, errors.ECODE_INVAL) |
1671 | 82187135 | Renรฉ Nussbaumer | |
1672 | 82187135 | Renรฉ Nussbaumer | return mac.lower()
|
1673 | 06009e27 | Iustin Pop | |
1674 | 06009e27 | Iustin Pop | |
1675 | 06009e27 | Iustin Pop | def TestDelay(duration): |
1676 | 06009e27 | Iustin Pop | """Sleep for a fixed amount of time.
|
1677 | 06009e27 | Iustin Pop |
|
1678 | 58885d79 | Iustin Pop | @type duration: float
|
1679 | 58885d79 | Iustin Pop | @param duration: the sleep duration
|
1680 | 58885d79 | Iustin Pop | @rtype: boolean
|
1681 | 58885d79 | Iustin Pop | @return: False for negative value, True otherwise
|
1682 | 58885d79 | Iustin Pop |
|
1683 | 06009e27 | Iustin Pop | """
|
1684 | 06009e27 | Iustin Pop | if duration < 0: |
1685 | 38ea42a1 | Iustin Pop | return False, "Invalid sleep duration" |
1686 | 06009e27 | Iustin Pop | time.sleep(duration) |
1687 | 38ea42a1 | Iustin Pop | return True, None |
1688 | 8f765069 | Iustin Pop | |
1689 | 8f765069 | Iustin Pop | |
1690 | 7d88772a | Iustin Pop | def _CloseFDNoErr(fd, retries=5): |
1691 | 7d88772a | Iustin Pop | """Close a file descriptor ignoring errors.
|
1692 | 8f765069 | Iustin Pop |
|
1693 | 7d88772a | Iustin Pop | @type fd: int
|
1694 | 7d88772a | Iustin Pop | @param fd: the file descriptor
|
1695 | 7d88772a | Iustin Pop | @type retries: int
|
1696 | 7d88772a | Iustin Pop | @param retries: how many retries to make, in case we get any
|
1697 | 7d88772a | Iustin Pop | other error than EBADF
|
1698 | 7d88772a | Iustin Pop |
|
1699 | 7d88772a | Iustin Pop | """
|
1700 | 7d88772a | Iustin Pop | try:
|
1701 | 7d88772a | Iustin Pop | os.close(fd) |
1702 | 7d88772a | Iustin Pop | except OSError, err: |
1703 | 7d88772a | Iustin Pop | if err.errno != errno.EBADF:
|
1704 | 7d88772a | Iustin Pop | if retries > 0: |
1705 | 7d88772a | Iustin Pop | _CloseFDNoErr(fd, retries - 1)
|
1706 | 7d88772a | Iustin Pop | # else either it's closed already or we're out of retries, so we
|
1707 | 7d88772a | Iustin Pop | # ignore this and go on
|
1708 | 7d88772a | Iustin Pop | |
1709 | 7d88772a | Iustin Pop | |
1710 | 7d88772a | Iustin Pop | def CloseFDs(noclose_fds=None): |
1711 | 7d88772a | Iustin Pop | """Close file descriptors.
|
1712 | 7d88772a | Iustin Pop |
|
1713 | 7d88772a | Iustin Pop | This closes all file descriptors above 2 (i.e. except
|
1714 | 7d88772a | Iustin Pop | stdin/out/err).
|
1715 | 8f765069 | Iustin Pop |
|
1716 | 58885d79 | Iustin Pop | @type noclose_fds: list or None
|
1717 | 58885d79 | Iustin Pop | @param noclose_fds: if given, it denotes a list of file descriptor
|
1718 | 58885d79 | Iustin Pop | that should not be closed
|
1719 | 58885d79 | Iustin Pop |
|
1720 | 8f765069 | Iustin Pop | """
|
1721 | 8f765069 | Iustin Pop | # Default maximum for the number of available file descriptors.
|
1722 | 8f765069 | Iustin Pop | if 'SC_OPEN_MAX' in os.sysconf_names: |
1723 | 8f765069 | Iustin Pop | try:
|
1724 | 8f765069 | Iustin Pop | MAXFD = os.sysconf('SC_OPEN_MAX')
|
1725 | 8f765069 | Iustin Pop | if MAXFD < 0: |
1726 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1727 | 8f765069 | Iustin Pop | except OSError: |
1728 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1729 | 8f765069 | Iustin Pop | else:
|
1730 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1731 | 7d88772a | Iustin Pop | maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
|
1732 | 7d88772a | Iustin Pop | if (maxfd == resource.RLIM_INFINITY):
|
1733 | 7d88772a | Iustin Pop | maxfd = MAXFD |
1734 | 7d88772a | Iustin Pop | |
1735 | 7d88772a | Iustin Pop | # Iterate through and close all file descriptors (except the standard ones)
|
1736 | 7d88772a | Iustin Pop | for fd in range(3, maxfd): |
1737 | 7d88772a | Iustin Pop | if noclose_fds and fd in noclose_fds: |
1738 | 7d88772a | Iustin Pop | continue
|
1739 | 7d88772a | Iustin Pop | _CloseFDNoErr(fd) |
1740 | 7d88772a | Iustin Pop | |
1741 | 7d88772a | Iustin Pop | |
1742 | 7d88772a | Iustin Pop | def Daemonize(logfile): |
1743 | 7d88772a | Iustin Pop | """Daemonize the current process.
|
1744 | 7d88772a | Iustin Pop |
|
1745 | 7d88772a | Iustin Pop | This detaches the current process from the controlling terminal and
|
1746 | 7d88772a | Iustin Pop | runs it in the background as a daemon.
|
1747 | 7d88772a | Iustin Pop |
|
1748 | 7d88772a | Iustin Pop | @type logfile: str
|
1749 | 7d88772a | Iustin Pop | @param logfile: the logfile to which we should redirect stdout/stderr
|
1750 | 7d88772a | Iustin Pop | @rtype: int
|
1751 | 5fcc718f | Iustin Pop | @return: the value zero
|
1752 | 7d88772a | Iustin Pop |
|
1753 | 7d88772a | Iustin Pop | """
|
1754 | 7260cfbe | Iustin Pop | # pylint: disable-msg=W0212
|
1755 | 7260cfbe | Iustin Pop | # yes, we really want os._exit
|
1756 | 7d88772a | Iustin Pop | UMASK = 077
|
1757 | 7d88772a | Iustin Pop | WORKDIR = "/"
|
1758 | 8f765069 | Iustin Pop | |
1759 | 8f765069 | Iustin Pop | # this might fail
|
1760 | 8f765069 | Iustin Pop | pid = os.fork() |
1761 | 8f765069 | Iustin Pop | if (pid == 0): # The first child. |
1762 | 8f765069 | Iustin Pop | os.setsid() |
1763 | 8f765069 | Iustin Pop | # this might fail
|
1764 | 8f765069 | Iustin Pop | pid = os.fork() # Fork a second child.
|
1765 | 8f765069 | Iustin Pop | if (pid == 0): # The second child. |
1766 | 8f765069 | Iustin Pop | os.chdir(WORKDIR) |
1767 | 8f765069 | Iustin Pop | os.umask(UMASK) |
1768 | 8f765069 | Iustin Pop | else:
|
1769 | 8f765069 | Iustin Pop | # exit() or _exit()? See below.
|
1770 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent (the first child) of the second child. |
1771 | 8f765069 | Iustin Pop | else:
|
1772 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent of the first child. |
1773 | 8f765069 | Iustin Pop | |
1774 | 7d88772a | Iustin Pop | for fd in range(3): |
1775 | 7d88772a | Iustin Pop | _CloseFDNoErr(fd) |
1776 | 7d88772a | Iustin Pop | i = os.open("/dev/null", os.O_RDONLY) # stdin |
1777 | 7d88772a | Iustin Pop | assert i == 0, "Can't close/reopen stdin" |
1778 | 7d88772a | Iustin Pop | i = os.open(logfile, os.O_WRONLY|os.O_CREAT|os.O_APPEND, 0600) # stdout |
1779 | 7d88772a | Iustin Pop | assert i == 1, "Can't close/reopen stdout" |
1780 | 7d88772a | Iustin Pop | # Duplicate standard output to standard error.
|
1781 | 7d88772a | Iustin Pop | os.dup2(1, 2) |
1782 | 8f765069 | Iustin Pop | return 0 |
1783 | 57c177af | Iustin Pop | |
1784 | 57c177af | Iustin Pop | |
1785 | 53beffbb | Iustin Pop | def DaemonPidFileName(name): |
1786 | 58885d79 | Iustin Pop | """Compute a ganeti pid file absolute path
|
1787 | 58885d79 | Iustin Pop |
|
1788 | 58885d79 | Iustin Pop | @type name: str
|
1789 | 58885d79 | Iustin Pop | @param name: the daemon name
|
1790 | 58885d79 | Iustin Pop | @rtype: str
|
1791 | 58885d79 | Iustin Pop | @return: the full path to the pidfile corresponding to the given
|
1792 | 58885d79 | Iustin Pop | daemon name
|
1793 | b330ac0b | Guido Trotter |
|
1794 | b330ac0b | Guido Trotter | """
|
1795 | c4feafe8 | Iustin Pop | return PathJoin(constants.RUN_GANETI_DIR, "%s.pid" % name) |
1796 | b330ac0b | Guido Trotter | |
1797 | b330ac0b | Guido Trotter | |
1798 | 2826b361 | Guido Trotter | def EnsureDaemon(name): |
1799 | 2826b361 | Guido Trotter | """Check for and start daemon if not alive.
|
1800 | 2826b361 | Guido Trotter |
|
1801 | 2826b361 | Guido Trotter | """
|
1802 | 2826b361 | Guido Trotter | result = RunCmd([constants.DAEMON_UTIL, "check-and-start", name])
|
1803 | 2826b361 | Guido Trotter | if result.failed:
|
1804 | 2826b361 | Guido Trotter | logging.error("Can't start daemon '%s', failure %s, output: %s",
|
1805 | 2826b361 | Guido Trotter | name, result.fail_reason, result.output) |
1806 | 2826b361 | Guido Trotter | return False |
1807 | 2826b361 | Guido Trotter | |
1808 | 2826b361 | Guido Trotter | return True |
1809 | 2826b361 | Guido Trotter | |
1810 | 2826b361 | Guido Trotter | |
1811 | b330ac0b | Guido Trotter | def WritePidFile(name): |
1812 | b330ac0b | Guido Trotter | """Write the current process pidfile.
|
1813 | b330ac0b | Guido Trotter |
|
1814 | 58885d79 | Iustin Pop | The file will be written to L{constants.RUN_GANETI_DIR}I{/name.pid}
|
1815 | 58885d79 | Iustin Pop |
|
1816 | 58885d79 | Iustin Pop | @type name: str
|
1817 | 58885d79 | Iustin Pop | @param name: the daemon name to use
|
1818 | 58885d79 | Iustin Pop | @raise errors.GenericError: if the pid file already exists and
|
1819 | 58885d79 | Iustin Pop | points to a live process
|
1820 | b330ac0b | Guido Trotter |
|
1821 | b330ac0b | Guido Trotter | """
|
1822 | b330ac0b | Guido Trotter | pid = os.getpid() |
1823 | 53beffbb | Iustin Pop | pidfilename = DaemonPidFileName(name) |
1824 | d9f311d7 | Iustin Pop | if IsProcessAlive(ReadPidFile(pidfilename)):
|
1825 | 533bb4b1 | Michael Hanselmann | raise errors.GenericError("%s contains a live process" % pidfilename) |
1826 | b330ac0b | Guido Trotter | |
1827 | b330ac0b | Guido Trotter | WriteFile(pidfilename, data="%d\n" % pid)
|
1828 | b330ac0b | Guido Trotter | |
1829 | b330ac0b | Guido Trotter | |
1830 | b330ac0b | Guido Trotter | def RemovePidFile(name): |
1831 | b330ac0b | Guido Trotter | """Remove the current process pidfile.
|
1832 | b330ac0b | Guido Trotter |
|
1833 | b330ac0b | Guido Trotter | Any errors are ignored.
|
1834 | b330ac0b | Guido Trotter |
|
1835 | 58885d79 | Iustin Pop | @type name: str
|
1836 | 58885d79 | Iustin Pop | @param name: the daemon name used to derive the pidfile name
|
1837 | 58885d79 | Iustin Pop |
|
1838 | b330ac0b | Guido Trotter | """
|
1839 | 53beffbb | Iustin Pop | pidfilename = DaemonPidFileName(name) |
1840 | b330ac0b | Guido Trotter | # TODO: we could check here that the file contains our pid
|
1841 | b330ac0b | Guido Trotter | try:
|
1842 | b330ac0b | Guido Trotter | RemoveFile(pidfilename) |
1843 | 7260cfbe | Iustin Pop | except: # pylint: disable-msg=W0702 |
1844 | b330ac0b | Guido Trotter | pass
|
1845 | b330ac0b | Guido Trotter | |
1846 | b330ac0b | Guido Trotter | |
1847 | ff5251bc | Iustin Pop | def KillProcess(pid, signal_=signal.SIGTERM, timeout=30, |
1848 | ff5251bc | Iustin Pop | waitpid=False):
|
1849 | b2a1f511 | Iustin Pop | """Kill a process given by its pid.
|
1850 | b2a1f511 | Iustin Pop |
|
1851 | b2a1f511 | Iustin Pop | @type pid: int
|
1852 | b2a1f511 | Iustin Pop | @param pid: The PID to terminate.
|
1853 | 38206f3c | Iustin Pop | @type signal_: int
|
1854 | 38206f3c | Iustin Pop | @param signal_: The signal to send, by default SIGTERM
|
1855 | b2a1f511 | Iustin Pop | @type timeout: int
|
1856 | b2a1f511 | Iustin Pop | @param timeout: The timeout after which, if the process is still alive,
|
1857 | b2a1f511 | Iustin Pop | a SIGKILL will be sent. If not positive, no such checking
|
1858 | b2a1f511 | Iustin Pop | will be done
|
1859 | ff5251bc | Iustin Pop | @type waitpid: boolean
|
1860 | ff5251bc | Iustin Pop | @param waitpid: If true, we should waitpid on this process after
|
1861 | ff5251bc | Iustin Pop | sending signals, since it's our own child and otherwise it
|
1862 | ff5251bc | Iustin Pop | would remain as zombie
|
1863 | b2a1f511 | Iustin Pop |
|
1864 | b2a1f511 | Iustin Pop | """
|
1865 | ff5251bc | Iustin Pop | def _helper(pid, signal_, wait): |
1866 | ff5251bc | Iustin Pop | """Simple helper to encapsulate the kill/waitpid sequence"""
|
1867 | ff5251bc | Iustin Pop | os.kill(pid, signal_) |
1868 | ff5251bc | Iustin Pop | if wait:
|
1869 | ff5251bc | Iustin Pop | try:
|
1870 | ff5251bc | Iustin Pop | os.waitpid(pid, os.WNOHANG) |
1871 | ff5251bc | Iustin Pop | except OSError: |
1872 | ff5251bc | Iustin Pop | pass
|
1873 | ff5251bc | Iustin Pop | |
1874 | b2a1f511 | Iustin Pop | if pid <= 0: |
1875 | b2a1f511 | Iustin Pop | # kill with pid=0 == suicide
|
1876 | b2a1f511 | Iustin Pop | raise errors.ProgrammerError("Invalid pid given '%s'" % pid) |
1877 | b2a1f511 | Iustin Pop | |
1878 | b2a1f511 | Iustin Pop | if not IsProcessAlive(pid): |
1879 | b2a1f511 | Iustin Pop | return
|
1880 | 31892b4c | Michael Hanselmann | |
1881 | ff5251bc | Iustin Pop | _helper(pid, signal_, waitpid) |
1882 | 31892b4c | Michael Hanselmann | |
1883 | b2a1f511 | Iustin Pop | if timeout <= 0: |
1884 | b2a1f511 | Iustin Pop | return
|
1885 | 7167159a | Michael Hanselmann | |
1886 | 31892b4c | Michael Hanselmann | def _CheckProcess(): |
1887 | 31892b4c | Michael Hanselmann | if not IsProcessAlive(pid): |
1888 | 31892b4c | Michael Hanselmann | return
|
1889 | 31892b4c | Michael Hanselmann | |
1890 | 7167159a | Michael Hanselmann | try:
|
1891 | 7167159a | Michael Hanselmann | (result_pid, _) = os.waitpid(pid, os.WNOHANG) |
1892 | 7167159a | Michael Hanselmann | except OSError: |
1893 | 31892b4c | Michael Hanselmann | raise RetryAgain()
|
1894 | 31892b4c | Michael Hanselmann | |
1895 | 31892b4c | Michael Hanselmann | if result_pid > 0: |
1896 | 31892b4c | Michael Hanselmann | return
|
1897 | 31892b4c | Michael Hanselmann | |
1898 | 31892b4c | Michael Hanselmann | raise RetryAgain()
|
1899 | 31892b4c | Michael Hanselmann | |
1900 | 31892b4c | Michael Hanselmann | try:
|
1901 | 31892b4c | Michael Hanselmann | # Wait up to $timeout seconds
|
1902 | 31892b4c | Michael Hanselmann | Retry(_CheckProcess, (0.01, 1.5, 0.1), timeout) |
1903 | 31892b4c | Michael Hanselmann | except RetryTimeout:
|
1904 | 31892b4c | Michael Hanselmann | pass
|
1905 | 7167159a | Michael Hanselmann | |
1906 | b2a1f511 | Iustin Pop | if IsProcessAlive(pid):
|
1907 | 7167159a | Michael Hanselmann | # Kill process if it's still alive
|
1908 | e1bd0072 | Iustin Pop | _helper(pid, signal.SIGKILL, waitpid) |
1909 | b2a1f511 | Iustin Pop | |
1910 | b2a1f511 | Iustin Pop | |
1911 | 57c177af | Iustin Pop | def FindFile(name, search_path, test=os.path.exists): |
1912 | 57c177af | Iustin Pop | """Look for a filesystem object in a given path.
|
1913 | 57c177af | Iustin Pop |
|
1914 | 57c177af | Iustin Pop | This is an abstract method to search for filesystem object (files,
|
1915 | 57c177af | Iustin Pop | dirs) under a given search path.
|
1916 | 57c177af | Iustin Pop |
|
1917 | 58885d79 | Iustin Pop | @type name: str
|
1918 | 58885d79 | Iustin Pop | @param name: the name to look for
|
1919 | 58885d79 | Iustin Pop | @type search_path: str
|
1920 | 58885d79 | Iustin Pop | @param search_path: location to start at
|
1921 | 58885d79 | Iustin Pop | @type test: callable
|
1922 | 58885d79 | Iustin Pop | @param test: a function taking one argument that should return True
|
1923 | 58885d79 | Iustin Pop | if the a given object is valid; the default value is
|
1924 | 58885d79 | Iustin Pop | os.path.exists, causing only existing files to be returned
|
1925 | 58885d79 | Iustin Pop | @rtype: str or None
|
1926 | 58885d79 | Iustin Pop | @return: full path to the object if found, None otherwise
|
1927 | 57c177af | Iustin Pop |
|
1928 | 57c177af | Iustin Pop | """
|
1929 | f95c81bf | Iustin Pop | # validate the filename mask
|
1930 | f95c81bf | Iustin Pop | if constants.EXT_PLUGIN_MASK.match(name) is None: |
1931 | f95c81bf | Iustin Pop | logging.critical("Invalid value passed for external script name: '%s'",
|
1932 | f95c81bf | Iustin Pop | name) |
1933 | f95c81bf | Iustin Pop | return None |
1934 | f95c81bf | Iustin Pop | |
1935 | 57c177af | Iustin Pop | for dir_name in search_path: |
1936 | e02b9114 | Iustin Pop | # FIXME: investigate switch to PathJoin
|
1937 | 57c177af | Iustin Pop | item_name = os.path.sep.join([dir_name, name]) |
1938 | f95c81bf | Iustin Pop | # check the user test and that we're indeed resolving to the given
|
1939 | f95c81bf | Iustin Pop | # basename
|
1940 | f95c81bf | Iustin Pop | if test(item_name) and os.path.basename(item_name) == name: |
1941 | 57c177af | Iustin Pop | return item_name
|
1942 | 57c177af | Iustin Pop | return None |
1943 | 8d1a2a64 | Michael Hanselmann | |
1944 | 8d1a2a64 | Michael Hanselmann | |
1945 | 8d1a2a64 | Michael Hanselmann | def CheckVolumeGroupSize(vglist, vgname, minsize): |
1946 | 8d1a2a64 | Michael Hanselmann | """Checks if the volume group list is valid.
|
1947 | 8d1a2a64 | Michael Hanselmann |
|
1948 | 58885d79 | Iustin Pop | The function will check if a given volume group is in the list of
|
1949 | 58885d79 | Iustin Pop | volume groups and has a minimum size.
|
1950 | 58885d79 | Iustin Pop |
|
1951 | 58885d79 | Iustin Pop | @type vglist: dict
|
1952 | 58885d79 | Iustin Pop | @param vglist: dictionary of volume group names and their size
|
1953 | 58885d79 | Iustin Pop | @type vgname: str
|
1954 | 58885d79 | Iustin Pop | @param vgname: the volume group we should check
|
1955 | 58885d79 | Iustin Pop | @type minsize: int
|
1956 | 58885d79 | Iustin Pop | @param minsize: the minimum size we accept
|
1957 | 58885d79 | Iustin Pop | @rtype: None or str
|
1958 | 58885d79 | Iustin Pop | @return: None for success, otherwise the error message
|
1959 | 8d1a2a64 | Michael Hanselmann |
|
1960 | 8d1a2a64 | Michael Hanselmann | """
|
1961 | 8d1a2a64 | Michael Hanselmann | vgsize = vglist.get(vgname, None)
|
1962 | 8d1a2a64 | Michael Hanselmann | if vgsize is None: |
1963 | 8d1a2a64 | Michael Hanselmann | return "volume group '%s' missing" % vgname |
1964 | 8d1a2a64 | Michael Hanselmann | elif vgsize < minsize:
|
1965 | 8d1a2a64 | Michael Hanselmann | return ("volume group '%s' too small (%s MiB required, %d MiB found)" % |
1966 | 8d1a2a64 | Michael Hanselmann | (vgname, minsize, vgsize)) |
1967 | 8d1a2a64 | Michael Hanselmann | return None |
1968 | 7996a135 | Iustin Pop | |
1969 | 7996a135 | Iustin Pop | |
1970 | 45bc5e4a | Michael Hanselmann | def SplitTime(value): |
1971 | 739be818 | Michael Hanselmann | """Splits time as floating point number into a tuple.
|
1972 | 739be818 | Michael Hanselmann |
|
1973 | 45bc5e4a | Michael Hanselmann | @param value: Time in seconds
|
1974 | 45bc5e4a | Michael Hanselmann | @type value: int or float
|
1975 | 45bc5e4a | Michael Hanselmann | @return: Tuple containing (seconds, microseconds)
|
1976 | 739be818 | Michael Hanselmann |
|
1977 | 739be818 | Michael Hanselmann | """
|
1978 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = divmod(int(value * 1000000), 1000000) |
1979 | 45bc5e4a | Michael Hanselmann | |
1980 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1981 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
1982 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
1983 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
1984 | 45bc5e4a | Michael Hanselmann | |
1985 | 45bc5e4a | Michael Hanselmann | return (int(seconds), int(microseconds)) |
1986 | 739be818 | Michael Hanselmann | |
1987 | 739be818 | Michael Hanselmann | |
1988 | 739be818 | Michael Hanselmann | def MergeTime(timetuple): |
1989 | 739be818 | Michael Hanselmann | """Merges a tuple into time as a floating point number.
|
1990 | 739be818 | Michael Hanselmann |
|
1991 | 45bc5e4a | Michael Hanselmann | @param timetuple: Time as tuple, (seconds, microseconds)
|
1992 | 739be818 | Michael Hanselmann | @type timetuple: tuple
|
1993 | 739be818 | Michael Hanselmann | @return: Time as a floating point number expressed in seconds
|
1994 | 739be818 | Michael Hanselmann |
|
1995 | 739be818 | Michael Hanselmann | """
|
1996 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = timetuple |
1997 | 739be818 | Michael Hanselmann | |
1998 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1999 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
2000 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
2001 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
2002 | 739be818 | Michael Hanselmann | |
2003 | 45bc5e4a | Michael Hanselmann | return float(seconds) + (float(microseconds) * 0.000001) |
2004 | 739be818 | Michael Hanselmann | |
2005 | 739be818 | Michael Hanselmann | |
2006 | cd50653c | Guido Trotter | def GetDaemonPort(daemon_name): |
2007 | cd50653c | Guido Trotter | """Get the daemon port for this cluster.
|
2008 | 4a8b186a | Michael Hanselmann |
|
2009 | 4a8b186a | Michael Hanselmann | Note that this routine does not read a ganeti-specific file, but
|
2010 | 58885d79 | Iustin Pop | instead uses C{socket.getservbyname} to allow pre-customization of
|
2011 | 4a8b186a | Michael Hanselmann | this parameter outside of Ganeti.
|
2012 | 4a8b186a | Michael Hanselmann |
|
2013 | cd50653c | Guido Trotter | @type daemon_name: string
|
2014 | cd50653c | Guido Trotter | @param daemon_name: daemon name (in constants.DAEMONS_PORTS)
|
2015 | 58885d79 | Iustin Pop | @rtype: int
|
2016 | 58885d79 | Iustin Pop |
|
2017 | 4a8b186a | Michael Hanselmann | """
|
2018 | cd50653c | Guido Trotter | if daemon_name not in constants.DAEMONS_PORTS: |
2019 | cd50653c | Guido Trotter | raise errors.ProgrammerError("Unknown daemon: %s" % daemon_name) |
2020 | cd50653c | Guido Trotter | |
2021 | cd50653c | Guido Trotter | (proto, default_port) = constants.DAEMONS_PORTS[daemon_name] |
2022 | 4a8b186a | Michael Hanselmann | try:
|
2023 | cd50653c | Guido Trotter | port = socket.getservbyname(daemon_name, proto) |
2024 | 4a8b186a | Michael Hanselmann | except socket.error:
|
2025 | cd50653c | Guido Trotter | port = default_port |
2026 | 4a8b186a | Michael Hanselmann | |
2027 | 4a8b186a | Michael Hanselmann | return port
|
2028 | 4a8b186a | Michael Hanselmann | |
2029 | 4a8b186a | Michael Hanselmann | |
2030 | ea34193f | Iustin Pop | def SetupLogging(logfile, debug=0, stderr_logging=False, program="", |
2031 | 551b6283 | Iustin Pop | multithreaded=False, syslog=constants.SYSLOG_USAGE):
|
2032 | 82d9caef | Iustin Pop | """Configures the logging module.
|
2033 | 82d9caef | Iustin Pop |
|
2034 | 58885d79 | Iustin Pop | @type logfile: str
|
2035 | 58885d79 | Iustin Pop | @param logfile: the filename to which we should log
|
2036 | ea34193f | Iustin Pop | @type debug: integer
|
2037 | ea34193f | Iustin Pop | @param debug: if greater than zero, enable debug messages, otherwise
|
2038 | 58885d79 | Iustin Pop | only those at C{INFO} and above level
|
2039 | 58885d79 | Iustin Pop | @type stderr_logging: boolean
|
2040 | 58885d79 | Iustin Pop | @param stderr_logging: whether we should also log to the standard error
|
2041 | 58885d79 | Iustin Pop | @type program: str
|
2042 | 58885d79 | Iustin Pop | @param program: the name under which we should log messages
|
2043 | d21d09d6 | Iustin Pop | @type multithreaded: boolean
|
2044 | d21d09d6 | Iustin Pop | @param multithreaded: if True, will add the thread name to the log file
|
2045 | 551b6283 | Iustin Pop | @type syslog: string
|
2046 | 551b6283 | Iustin Pop | @param syslog: one of 'no', 'yes', 'only':
|
2047 | 551b6283 | Iustin Pop | - if no, syslog is not used
|
2048 | 551b6283 | Iustin Pop | - if yes, syslog is used (in addition to file-logging)
|
2049 | 551b6283 | Iustin Pop | - if only, only syslog is used
|
2050 | 58885d79 | Iustin Pop | @raise EnvironmentError: if we can't open the log file and
|
2051 | 551b6283 | Iustin Pop | syslog/stderr logging is disabled
|
2052 | 58885d79 | Iustin Pop |
|
2053 | 82d9caef | Iustin Pop | """
|
2054 | d21d09d6 | Iustin Pop | fmt = "%(asctime)s: " + program + " pid=%(process)d" |
2055 | 551b6283 | Iustin Pop | sft = program + "[%(process)d]:"
|
2056 | d21d09d6 | Iustin Pop | if multithreaded:
|
2057 | d21d09d6 | Iustin Pop | fmt += "/%(threadName)s"
|
2058 | 551b6283 | Iustin Pop | sft += " (%(threadName)s)"
|
2059 | 82d9caef | Iustin Pop | if debug:
|
2060 | d21d09d6 | Iustin Pop | fmt += " %(module)s:%(lineno)s"
|
2061 | 551b6283 | Iustin Pop | # no debug info for syslog loggers
|
2062 | d21d09d6 | Iustin Pop | fmt += " %(levelname)s %(message)s"
|
2063 | 551b6283 | Iustin Pop | # yes, we do want the textual level, as remote syslog will probably
|
2064 | 551b6283 | Iustin Pop | # lose the error level, and it's easier to grep for it
|
2065 | 551b6283 | Iustin Pop | sft += " %(levelname)s %(message)s"
|
2066 | 82d9caef | Iustin Pop | formatter = logging.Formatter(fmt) |
2067 | 551b6283 | Iustin Pop | sys_fmt = logging.Formatter(sft) |
2068 | 82d9caef | Iustin Pop | |
2069 | 82d9caef | Iustin Pop | root_logger = logging.getLogger("")
|
2070 | 82d9caef | Iustin Pop | root_logger.setLevel(logging.NOTSET) |
2071 | 82d9caef | Iustin Pop | |
2072 | 6346a9e5 | Michael Hanselmann | # Remove all previously setup handlers
|
2073 | 6346a9e5 | Michael Hanselmann | for handler in root_logger.handlers: |
2074 | 7d88772a | Iustin Pop | handler.close() |
2075 | 6346a9e5 | Michael Hanselmann | root_logger.removeHandler(handler) |
2076 | 6346a9e5 | Michael Hanselmann | |
2077 | 82d9caef | Iustin Pop | if stderr_logging:
|
2078 | 82d9caef | Iustin Pop | stderr_handler = logging.StreamHandler() |
2079 | 82d9caef | Iustin Pop | stderr_handler.setFormatter(formatter) |
2080 | 82d9caef | Iustin Pop | if debug:
|
2081 | 82d9caef | Iustin Pop | stderr_handler.setLevel(logging.NOTSET) |
2082 | 82d9caef | Iustin Pop | else:
|
2083 | 82d9caef | Iustin Pop | stderr_handler.setLevel(logging.CRITICAL) |
2084 | 82d9caef | Iustin Pop | root_logger.addHandler(stderr_handler) |
2085 | 82d9caef | Iustin Pop | |
2086 | 551b6283 | Iustin Pop | if syslog in (constants.SYSLOG_YES, constants.SYSLOG_ONLY): |
2087 | 551b6283 | Iustin Pop | facility = logging.handlers.SysLogHandler.LOG_DAEMON |
2088 | 551b6283 | Iustin Pop | syslog_handler = logging.handlers.SysLogHandler(constants.SYSLOG_SOCKET, |
2089 | 551b6283 | Iustin Pop | facility) |
2090 | 551b6283 | Iustin Pop | syslog_handler.setFormatter(sys_fmt) |
2091 | 551b6283 | Iustin Pop | # Never enable debug over syslog
|
2092 | 551b6283 | Iustin Pop | syslog_handler.setLevel(logging.INFO) |
2093 | 551b6283 | Iustin Pop | root_logger.addHandler(syslog_handler) |
2094 | 551b6283 | Iustin Pop | |
2095 | 551b6283 | Iustin Pop | if syslog != constants.SYSLOG_ONLY:
|
2096 | 551b6283 | Iustin Pop | # this can fail, if the logging directories are not setup or we have
|
2097 | 551b6283 | Iustin Pop | # a permisssion problem; in this case, it's best to log but ignore
|
2098 | 551b6283 | Iustin Pop | # the error if stderr_logging is True, and if false we re-raise the
|
2099 | 551b6283 | Iustin Pop | # exception since otherwise we could run but without any logs at all
|
2100 | 551b6283 | Iustin Pop | try:
|
2101 | 551b6283 | Iustin Pop | logfile_handler = logging.FileHandler(logfile) |
2102 | 551b6283 | Iustin Pop | logfile_handler.setFormatter(formatter) |
2103 | 551b6283 | Iustin Pop | if debug:
|
2104 | 551b6283 | Iustin Pop | logfile_handler.setLevel(logging.DEBUG) |
2105 | 551b6283 | Iustin Pop | else:
|
2106 | 551b6283 | Iustin Pop | logfile_handler.setLevel(logging.INFO) |
2107 | 551b6283 | Iustin Pop | root_logger.addHandler(logfile_handler) |
2108 | 551b6283 | Iustin Pop | except EnvironmentError: |
2109 | 551b6283 | Iustin Pop | if stderr_logging or syslog == constants.SYSLOG_YES: |
2110 | 551b6283 | Iustin Pop | logging.exception("Failed to enable logging to file '%s'", logfile)
|
2111 | 551b6283 | Iustin Pop | else:
|
2112 | 551b6283 | Iustin Pop | # we need to re-raise the exception
|
2113 | 551b6283 | Iustin Pop | raise
|
2114 | 82d9caef | Iustin Pop | |
2115 | 016d04b3 | Michael Hanselmann | |
2116 | da961187 | Guido Trotter | def IsNormAbsPath(path): |
2117 | 17c61836 | Guido Trotter | """Check whether a path is absolute and also normalized
|
2118 | da961187 | Guido Trotter |
|
2119 | da961187 | Guido Trotter | This avoids things like /dir/../../other/path to be valid.
|
2120 | da961187 | Guido Trotter |
|
2121 | da961187 | Guido Trotter | """
|
2122 | da961187 | Guido Trotter | return os.path.normpath(path) == path and os.path.isabs(path) |
2123 | 82d9caef | Iustin Pop | |
2124 | 016d04b3 | Michael Hanselmann | |
2125 | 4bb678e9 | Iustin Pop | def PathJoin(*args): |
2126 | 4bb678e9 | Iustin Pop | """Safe-join a list of path components.
|
2127 | 4bb678e9 | Iustin Pop |
|
2128 | 4bb678e9 | Iustin Pop | Requirements:
|
2129 | 4bb678e9 | Iustin Pop | - the first argument must be an absolute path
|
2130 | 4bb678e9 | Iustin Pop | - no component in the path must have backtracking (e.g. /../),
|
2131 | 4bb678e9 | Iustin Pop | since we check for normalization at the end
|
2132 | 4bb678e9 | Iustin Pop |
|
2133 | 4bb678e9 | Iustin Pop | @param args: the path components to be joined
|
2134 | 4bb678e9 | Iustin Pop | @raise ValueError: for invalid paths
|
2135 | 4bb678e9 | Iustin Pop |
|
2136 | 4bb678e9 | Iustin Pop | """
|
2137 | 4bb678e9 | Iustin Pop | # ensure we're having at least one path passed in
|
2138 | 4bb678e9 | Iustin Pop | assert args
|
2139 | 4bb678e9 | Iustin Pop | # ensure the first component is an absolute and normalized path name
|
2140 | 4bb678e9 | Iustin Pop | root = args[0]
|
2141 | 4bb678e9 | Iustin Pop | if not IsNormAbsPath(root): |
2142 | 4bb678e9 | Iustin Pop | raise ValueError("Invalid parameter to PathJoin: '%s'" % str(args[0])) |
2143 | 4bb678e9 | Iustin Pop | result = os.path.join(*args) |
2144 | 4bb678e9 | Iustin Pop | # ensure that the whole path is normalized
|
2145 | 4bb678e9 | Iustin Pop | if not IsNormAbsPath(result): |
2146 | 4bb678e9 | Iustin Pop | raise ValueError("Invalid parameters to PathJoin: '%s'" % str(args)) |
2147 | 4bb678e9 | Iustin Pop | # check that we're still under the original prefix
|
2148 | 4bb678e9 | Iustin Pop | prefix = os.path.commonprefix([root, result]) |
2149 | 4bb678e9 | Iustin Pop | if prefix != root:
|
2150 | 4bb678e9 | Iustin Pop | raise ValueError("Error: path joining resulted in different prefix" |
2151 | 4bb678e9 | Iustin Pop | " (%s != %s)" % (prefix, root))
|
2152 | 4bb678e9 | Iustin Pop | return result
|
2153 | 4bb678e9 | Iustin Pop | |
2154 | 4bb678e9 | Iustin Pop | |
2155 | f65f63ef | Iustin Pop | def TailFile(fname, lines=20): |
2156 | f65f63ef | Iustin Pop | """Return the last lines from a file.
|
2157 | f65f63ef | Iustin Pop |
|
2158 | f65f63ef | Iustin Pop | @note: this function will only read and parse the last 4KB of
|
2159 | f65f63ef | Iustin Pop | the file; if the lines are very long, it could be that less
|
2160 | f65f63ef | Iustin Pop | than the requested number of lines are returned
|
2161 | f65f63ef | Iustin Pop |
|
2162 | f65f63ef | Iustin Pop | @param fname: the file name
|
2163 | f65f63ef | Iustin Pop | @type lines: int
|
2164 | f65f63ef | Iustin Pop | @param lines: the (maximum) number of lines to return
|
2165 | f65f63ef | Iustin Pop |
|
2166 | f65f63ef | Iustin Pop | """
|
2167 | f65f63ef | Iustin Pop | fd = open(fname, "r") |
2168 | f65f63ef | Iustin Pop | try:
|
2169 | f65f63ef | Iustin Pop | fd.seek(0, 2) |
2170 | f65f63ef | Iustin Pop | pos = fd.tell() |
2171 | f65f63ef | Iustin Pop | pos = max(0, pos-4096) |
2172 | f65f63ef | Iustin Pop | fd.seek(pos, 0)
|
2173 | f65f63ef | Iustin Pop | raw_data = fd.read() |
2174 | f65f63ef | Iustin Pop | finally:
|
2175 | f65f63ef | Iustin Pop | fd.close() |
2176 | f65f63ef | Iustin Pop | |
2177 | f65f63ef | Iustin Pop | rows = raw_data.splitlines() |
2178 | f65f63ef | Iustin Pop | return rows[-lines:]
|
2179 | f65f63ef | Iustin Pop | |
2180 | f65f63ef | Iustin Pop | |
2181 | 27e46076 | Michael Hanselmann | def _ParseAsn1Generalizedtime(value): |
2182 | 27e46076 | Michael Hanselmann | """Parses an ASN1 GENERALIZEDTIME timestamp as used by pyOpenSSL.
|
2183 | 27e46076 | Michael Hanselmann |
|
2184 | 27e46076 | Michael Hanselmann | @type value: string
|
2185 | 27e46076 | Michael Hanselmann | @param value: ASN1 GENERALIZEDTIME timestamp
|
2186 | 27e46076 | Michael Hanselmann |
|
2187 | 27e46076 | Michael Hanselmann | """
|
2188 | 27e46076 | Michael Hanselmann | m = re.match(r"^(\d+)([-+]\d\d)(\d\d)$", value)
|
2189 | 27e46076 | Michael Hanselmann | if m:
|
2190 | 27e46076 | Michael Hanselmann | # We have an offset
|
2191 | 27e46076 | Michael Hanselmann | asn1time = m.group(1)
|
2192 | 27e46076 | Michael Hanselmann | hours = int(m.group(2)) |
2193 | 27e46076 | Michael Hanselmann | minutes = int(m.group(3)) |
2194 | 27e46076 | Michael Hanselmann | utcoffset = (60 * hours) + minutes
|
2195 | 27e46076 | Michael Hanselmann | else:
|
2196 | 27e46076 | Michael Hanselmann | if not value.endswith("Z"): |
2197 | 27e46076 | Michael Hanselmann | raise ValueError("Missing timezone") |
2198 | 27e46076 | Michael Hanselmann | asn1time = value[:-1]
|
2199 | 27e46076 | Michael Hanselmann | utcoffset = 0
|
2200 | 27e46076 | Michael Hanselmann | |
2201 | 27e46076 | Michael Hanselmann | parsed = time.strptime(asn1time, "%Y%m%d%H%M%S")
|
2202 | 27e46076 | Michael Hanselmann | |
2203 | 27e46076 | Michael Hanselmann | tt = datetime.datetime(*(parsed[:7])) - datetime.timedelta(minutes=utcoffset)
|
2204 | 27e46076 | Michael Hanselmann | |
2205 | 27e46076 | Michael Hanselmann | return calendar.timegm(tt.utctimetuple())
|
2206 | 27e46076 | Michael Hanselmann | |
2207 | 27e46076 | Michael Hanselmann | |
2208 | 27e46076 | Michael Hanselmann | def GetX509CertValidity(cert): |
2209 | 27e46076 | Michael Hanselmann | """Returns the validity period of the certificate.
|
2210 | 27e46076 | Michael Hanselmann |
|
2211 | 27e46076 | Michael Hanselmann | @type cert: OpenSSL.crypto.X509
|
2212 | 27e46076 | Michael Hanselmann | @param cert: X509 certificate object
|
2213 | 27e46076 | Michael Hanselmann |
|
2214 | 27e46076 | Michael Hanselmann | """
|
2215 | 27e46076 | Michael Hanselmann | # The get_notBefore and get_notAfter functions are only supported in
|
2216 | 27e46076 | Michael Hanselmann | # pyOpenSSL 0.7 and above.
|
2217 | 27e46076 | Michael Hanselmann | try:
|
2218 | 27e46076 | Michael Hanselmann | get_notbefore_fn = cert.get_notBefore |
2219 | 27e46076 | Michael Hanselmann | except AttributeError: |
2220 | 27e46076 | Michael Hanselmann | not_before = None
|
2221 | 27e46076 | Michael Hanselmann | else:
|
2222 | 27e46076 | Michael Hanselmann | not_before_asn1 = get_notbefore_fn() |
2223 | 27e46076 | Michael Hanselmann | |
2224 | 27e46076 | Michael Hanselmann | if not_before_asn1 is None: |
2225 | 27e46076 | Michael Hanselmann | not_before = None
|
2226 | 27e46076 | Michael Hanselmann | else:
|
2227 | 27e46076 | Michael Hanselmann | not_before = _ParseAsn1Generalizedtime(not_before_asn1) |
2228 | 27e46076 | Michael Hanselmann | |
2229 | 27e46076 | Michael Hanselmann | try:
|
2230 | 27e46076 | Michael Hanselmann | get_notafter_fn = cert.get_notAfter |
2231 | 27e46076 | Michael Hanselmann | except AttributeError: |
2232 | 27e46076 | Michael Hanselmann | not_after = None
|
2233 | 27e46076 | Michael Hanselmann | else:
|
2234 | 27e46076 | Michael Hanselmann | not_after_asn1 = get_notafter_fn() |
2235 | 27e46076 | Michael Hanselmann | |
2236 | 27e46076 | Michael Hanselmann | if not_after_asn1 is None: |
2237 | 27e46076 | Michael Hanselmann | not_after = None
|
2238 | 27e46076 | Michael Hanselmann | else:
|
2239 | 27e46076 | Michael Hanselmann | not_after = _ParseAsn1Generalizedtime(not_after_asn1) |
2240 | 27e46076 | Michael Hanselmann | |
2241 | 27e46076 | Michael Hanselmann | return (not_before, not_after)
|
2242 | 27e46076 | Michael Hanselmann | |
2243 | 27e46076 | Michael Hanselmann | |
2244 | 26f15862 | Iustin Pop | def SafeEncode(text): |
2245 | 26f15862 | Iustin Pop | """Return a 'safe' version of a source string.
|
2246 | 26f15862 | Iustin Pop |
|
2247 | 26f15862 | Iustin Pop | This function mangles the input string and returns a version that
|
2248 | d392fa34 | Iustin Pop | should be safe to display/encode as ASCII. To this end, we first
|
2249 | 26f15862 | Iustin Pop | convert it to ASCII using the 'backslashreplace' encoding which
|
2250 | d392fa34 | Iustin Pop | should get rid of any non-ASCII chars, and then we process it
|
2251 | d392fa34 | Iustin Pop | through a loop copied from the string repr sources in the python; we
|
2252 | d392fa34 | Iustin Pop | don't use string_escape anymore since that escape single quotes and
|
2253 | d392fa34 | Iustin Pop | backslashes too, and that is too much; and that escaping is not
|
2254 | d392fa34 | Iustin Pop | stable, i.e. string_escape(string_escape(x)) != string_escape(x).
|
2255 | 26f15862 | Iustin Pop |
|
2256 | 26f15862 | Iustin Pop | @type text: str or unicode
|
2257 | 26f15862 | Iustin Pop | @param text: input data
|
2258 | 26f15862 | Iustin Pop | @rtype: str
|
2259 | 26f15862 | Iustin Pop | @return: a safe version of text
|
2260 | 26f15862 | Iustin Pop |
|
2261 | 26f15862 | Iustin Pop | """
|
2262 | d392fa34 | Iustin Pop | if isinstance(text, unicode): |
2263 | 5bbd3f7f | Michael Hanselmann | # only if unicode; if str already, we handle it below
|
2264 | d392fa34 | Iustin Pop | text = text.encode('ascii', 'backslashreplace') |
2265 | d392fa34 | Iustin Pop | resu = ""
|
2266 | d392fa34 | Iustin Pop | for char in text: |
2267 | d392fa34 | Iustin Pop | c = ord(char)
|
2268 | d392fa34 | Iustin Pop | if char == '\t': |
2269 | d392fa34 | Iustin Pop | resu += r'\t'
|
2270 | d392fa34 | Iustin Pop | elif char == '\n': |
2271 | d392fa34 | Iustin Pop | resu += r'\n'
|
2272 | d392fa34 | Iustin Pop | elif char == '\r': |
2273 | d392fa34 | Iustin Pop | resu += r'\'r'
|
2274 | d392fa34 | Iustin Pop | elif c < 32 or c >= 127: # non-printable |
2275 | d392fa34 | Iustin Pop | resu += "\\x%02x" % (c & 0xff) |
2276 | d392fa34 | Iustin Pop | else:
|
2277 | d392fa34 | Iustin Pop | resu += char |
2278 | d392fa34 | Iustin Pop | return resu
|
2279 | 26f15862 | Iustin Pop | |
2280 | 26f15862 | Iustin Pop | |
2281 | 5b69bc7c | Iustin Pop | def UnescapeAndSplit(text, sep=","): |
2282 | 5b69bc7c | Iustin Pop | """Split and unescape a string based on a given separator.
|
2283 | 5b69bc7c | Iustin Pop |
|
2284 | 5b69bc7c | Iustin Pop | This function splits a string based on a separator where the
|
2285 | 5b69bc7c | Iustin Pop | separator itself can be escape in order to be an element of the
|
2286 | 5b69bc7c | Iustin Pop | elements. The escaping rules are (assuming coma being the
|
2287 | 5b69bc7c | Iustin Pop | separator):
|
2288 | 5b69bc7c | Iustin Pop | - a plain , separates the elements
|
2289 | 5b69bc7c | Iustin Pop | - a sequence \\\\, (double backslash plus comma) is handled as a
|
2290 | 5b69bc7c | Iustin Pop | backslash plus a separator comma
|
2291 | 5b69bc7c | Iustin Pop | - a sequence \, (backslash plus comma) is handled as a
|
2292 | 5b69bc7c | Iustin Pop | non-separator comma
|
2293 | 5b69bc7c | Iustin Pop |
|
2294 | 5b69bc7c | Iustin Pop | @type text: string
|
2295 | 5b69bc7c | Iustin Pop | @param text: the string to split
|
2296 | 5b69bc7c | Iustin Pop | @type sep: string
|
2297 | 5b69bc7c | Iustin Pop | @param text: the separator
|
2298 | 5b69bc7c | Iustin Pop | @rtype: string
|
2299 | 5b69bc7c | Iustin Pop | @return: a list of strings
|
2300 | 5b69bc7c | Iustin Pop |
|
2301 | 5b69bc7c | Iustin Pop | """
|
2302 | 5b69bc7c | Iustin Pop | # we split the list by sep (with no escaping at this stage)
|
2303 | 5b69bc7c | Iustin Pop | slist = text.split(sep) |
2304 | 5b69bc7c | Iustin Pop | # next, we revisit the elements and if any of them ended with an odd
|
2305 | 5b69bc7c | Iustin Pop | # number of backslashes, then we join it with the next
|
2306 | 5b69bc7c | Iustin Pop | rlist = [] |
2307 | 5b69bc7c | Iustin Pop | while slist:
|
2308 | 5b69bc7c | Iustin Pop | e1 = slist.pop(0)
|
2309 | 5b69bc7c | Iustin Pop | if e1.endswith("\\"): |
2310 | 5b69bc7c | Iustin Pop | num_b = len(e1) - len(e1.rstrip("\\")) |
2311 | 5b69bc7c | Iustin Pop | if num_b % 2 == 1: |
2312 | 5b69bc7c | Iustin Pop | e2 = slist.pop(0)
|
2313 | 5b69bc7c | Iustin Pop | # here the backslashes remain (all), and will be reduced in
|
2314 | 5b69bc7c | Iustin Pop | # the next step
|
2315 | 5b69bc7c | Iustin Pop | rlist.append(e1 + sep + e2) |
2316 | 5b69bc7c | Iustin Pop | continue
|
2317 | 5b69bc7c | Iustin Pop | rlist.append(e1) |
2318 | 5b69bc7c | Iustin Pop | # finally, replace backslash-something with something
|
2319 | 5b69bc7c | Iustin Pop | rlist = [re.sub(r"\\(.)", r"\1", v) for v in rlist] |
2320 | 5b69bc7c | Iustin Pop | return rlist
|
2321 | 5b69bc7c | Iustin Pop | |
2322 | 5b69bc7c | Iustin Pop | |
2323 | ab3e6da8 | Iustin Pop | def CommaJoin(names): |
2324 | ab3e6da8 | Iustin Pop | """Nicely join a set of identifiers.
|
2325 | ab3e6da8 | Iustin Pop |
|
2326 | ab3e6da8 | Iustin Pop | @param names: set, list or tuple
|
2327 | ab3e6da8 | Iustin Pop | @return: a string with the formatted results
|
2328 | ab3e6da8 | Iustin Pop |
|
2329 | ab3e6da8 | Iustin Pop | """
|
2330 | 1f864b60 | Iustin Pop | return ", ".join([str(val) for val in names]) |
2331 | ab3e6da8 | Iustin Pop | |
2332 | ab3e6da8 | Iustin Pop | |
2333 | 3f6a47a8 | Michael Hanselmann | def BytesToMebibyte(value): |
2334 | 3f6a47a8 | Michael Hanselmann | """Converts bytes to mebibytes.
|
2335 | 3f6a47a8 | Michael Hanselmann |
|
2336 | 3f6a47a8 | Michael Hanselmann | @type value: int
|
2337 | 3f6a47a8 | Michael Hanselmann | @param value: Value in bytes
|
2338 | 3f6a47a8 | Michael Hanselmann | @rtype: int
|
2339 | 3f6a47a8 | Michael Hanselmann | @return: Value in mebibytes
|
2340 | 3f6a47a8 | Michael Hanselmann |
|
2341 | 3f6a47a8 | Michael Hanselmann | """
|
2342 | 3f6a47a8 | Michael Hanselmann | return int(round(value / (1024.0 * 1024.0), 0)) |
2343 | 3f6a47a8 | Michael Hanselmann | |
2344 | 3f6a47a8 | Michael Hanselmann | |
2345 | 3f6a47a8 | Michael Hanselmann | def CalculateDirectorySize(path): |
2346 | 3f6a47a8 | Michael Hanselmann | """Calculates the size of a directory recursively.
|
2347 | 3f6a47a8 | Michael Hanselmann |
|
2348 | 3f6a47a8 | Michael Hanselmann | @type path: string
|
2349 | 3f6a47a8 | Michael Hanselmann | @param path: Path to directory
|
2350 | 3f6a47a8 | Michael Hanselmann | @rtype: int
|
2351 | 3f6a47a8 | Michael Hanselmann | @return: Size in mebibytes
|
2352 | 3f6a47a8 | Michael Hanselmann |
|
2353 | 3f6a47a8 | Michael Hanselmann | """
|
2354 | 3f6a47a8 | Michael Hanselmann | size = 0
|
2355 | 3f6a47a8 | Michael Hanselmann | |
2356 | 3f6a47a8 | Michael Hanselmann | for (curpath, _, files) in os.walk(path): |
2357 | 2a887df9 | Michael Hanselmann | for filename in files: |
2358 | c4feafe8 | Iustin Pop | st = os.lstat(PathJoin(curpath, filename)) |
2359 | 3f6a47a8 | Michael Hanselmann | size += st.st_size |
2360 | 3f6a47a8 | Michael Hanselmann | |
2361 | 3f6a47a8 | Michael Hanselmann | return BytesToMebibyte(size)
|
2362 | 3f6a47a8 | Michael Hanselmann | |
2363 | 3f6a47a8 | Michael Hanselmann | |
2364 | 620a85fd | Iustin Pop | def GetFilesystemStats(path): |
2365 | 620a85fd | Iustin Pop | """Returns the total and free space on a filesystem.
|
2366 | 3f6a47a8 | Michael Hanselmann |
|
2367 | 3f6a47a8 | Michael Hanselmann | @type path: string
|
2368 | 3f6a47a8 | Michael Hanselmann | @param path: Path on filesystem to be examined
|
2369 | 3f6a47a8 | Michael Hanselmann | @rtype: int
|
2370 | 620a85fd | Iustin Pop | @return: tuple of (Total space, Free space) in mebibytes
|
2371 | 3f6a47a8 | Michael Hanselmann |
|
2372 | 3f6a47a8 | Michael Hanselmann | """
|
2373 | 3f6a47a8 | Michael Hanselmann | st = os.statvfs(path) |
2374 | 3f6a47a8 | Michael Hanselmann | |
2375 | 620a85fd | Iustin Pop | fsize = BytesToMebibyte(st.f_bavail * st.f_frsize) |
2376 | 620a85fd | Iustin Pop | tsize = BytesToMebibyte(st.f_blocks * st.f_frsize) |
2377 | 620a85fd | Iustin Pop | return (tsize, fsize)
|
2378 | 3f6a47a8 | Michael Hanselmann | |
2379 | 3f6a47a8 | Michael Hanselmann | |
2380 | bdefe5dd | Michael Hanselmann | def RunInSeparateProcess(fn, *args): |
2381 | eb58f7bd | Michael Hanselmann | """Runs a function in a separate process.
|
2382 | eb58f7bd | Michael Hanselmann |
|
2383 | eb58f7bd | Michael Hanselmann | Note: Only boolean return values are supported.
|
2384 | eb58f7bd | Michael Hanselmann |
|
2385 | eb58f7bd | Michael Hanselmann | @type fn: callable
|
2386 | eb58f7bd | Michael Hanselmann | @param fn: Function to be called
|
2387 | bdefe5dd | Michael Hanselmann | @rtype: bool
|
2388 | bdefe5dd | Michael Hanselmann | @return: Function's result
|
2389 | eb58f7bd | Michael Hanselmann |
|
2390 | eb58f7bd | Michael Hanselmann | """
|
2391 | eb58f7bd | Michael Hanselmann | pid = os.fork() |
2392 | eb58f7bd | Michael Hanselmann | if pid == 0: |
2393 | eb58f7bd | Michael Hanselmann | # Child process
|
2394 | eb58f7bd | Michael Hanselmann | try:
|
2395 | 82869978 | Michael Hanselmann | # In case the function uses temporary files
|
2396 | 82869978 | Michael Hanselmann | ResetTempfileModule() |
2397 | 82869978 | Michael Hanselmann | |
2398 | eb58f7bd | Michael Hanselmann | # Call function
|
2399 | bdefe5dd | Michael Hanselmann | result = int(bool(fn(*args))) |
2400 | eb58f7bd | Michael Hanselmann | assert result in (0, 1) |
2401 | eb58f7bd | Michael Hanselmann | except: # pylint: disable-msg=W0702 |
2402 | eb58f7bd | Michael Hanselmann | logging.exception("Error while calling function in separate process")
|
2403 | eb58f7bd | Michael Hanselmann | # 0 and 1 are reserved for the return value
|
2404 | eb58f7bd | Michael Hanselmann | result = 33
|
2405 | eb58f7bd | Michael Hanselmann | |
2406 | eb58f7bd | Michael Hanselmann | os._exit(result) # pylint: disable-msg=W0212
|
2407 | eb58f7bd | Michael Hanselmann | |
2408 | eb58f7bd | Michael Hanselmann | # Parent process
|
2409 | eb58f7bd | Michael Hanselmann | |
2410 | eb58f7bd | Michael Hanselmann | # Avoid zombies and check exit code
|
2411 | eb58f7bd | Michael Hanselmann | (_, status) = os.waitpid(pid, 0)
|
2412 | eb58f7bd | Michael Hanselmann | |
2413 | eb58f7bd | Michael Hanselmann | if os.WIFSIGNALED(status):
|
2414 | eb58f7bd | Michael Hanselmann | exitcode = None
|
2415 | eb58f7bd | Michael Hanselmann | signum = os.WTERMSIG(status) |
2416 | eb58f7bd | Michael Hanselmann | else:
|
2417 | eb58f7bd | Michael Hanselmann | exitcode = os.WEXITSTATUS(status) |
2418 | eb58f7bd | Michael Hanselmann | signum = None
|
2419 | eb58f7bd | Michael Hanselmann | |
2420 | eb58f7bd | Michael Hanselmann | if not (exitcode in (0, 1) and signum is None): |
2421 | eb58f7bd | Michael Hanselmann | raise errors.GenericError("Child program failed (code=%s, signal=%s)" % |
2422 | eb58f7bd | Michael Hanselmann | (exitcode, signum)) |
2423 | eb58f7bd | Michael Hanselmann | |
2424 | eb58f7bd | Michael Hanselmann | return bool(exitcode) |
2425 | eb58f7bd | Michael Hanselmann | |
2426 | eb58f7bd | Michael Hanselmann | |
2427 | 7996a135 | Iustin Pop | def LockedMethod(fn): |
2428 | 7996a135 | Iustin Pop | """Synchronized object access decorator.
|
2429 | 7996a135 | Iustin Pop |
|
2430 | 7996a135 | Iustin Pop | This decorator is intended to protect access to an object using the
|
2431 | 7996a135 | Iustin Pop | object's own lock which is hardcoded to '_lock'.
|
2432 | 7996a135 | Iustin Pop |
|
2433 | 7996a135 | Iustin Pop | """
|
2434 | e67bd559 | Michael Hanselmann | def _LockDebug(*args, **kwargs): |
2435 | e67bd559 | Michael Hanselmann | if debug_locks:
|
2436 | e67bd559 | Michael Hanselmann | logging.debug(*args, **kwargs) |
2437 | e67bd559 | Michael Hanselmann | |
2438 | 7996a135 | Iustin Pop | def wrapper(self, *args, **kwargs): |
2439 | 7260cfbe | Iustin Pop | # pylint: disable-msg=W0212
|
2440 | 7996a135 | Iustin Pop | assert hasattr(self, '_lock') |
2441 | 7996a135 | Iustin Pop | lock = self._lock
|
2442 | e67bd559 | Michael Hanselmann | _LockDebug("Waiting for %s", lock)
|
2443 | 7996a135 | Iustin Pop | lock.acquire() |
2444 | 7996a135 | Iustin Pop | try:
|
2445 | e67bd559 | Michael Hanselmann | _LockDebug("Acquired %s", lock)
|
2446 | 7996a135 | Iustin Pop | result = fn(self, *args, **kwargs)
|
2447 | 7996a135 | Iustin Pop | finally:
|
2448 | e67bd559 | Michael Hanselmann | _LockDebug("Releasing %s", lock)
|
2449 | 7996a135 | Iustin Pop | lock.release() |
2450 | e67bd559 | Michael Hanselmann | _LockDebug("Released %s", lock)
|
2451 | 7996a135 | Iustin Pop | return result
|
2452 | 7996a135 | Iustin Pop | return wrapper
|
2453 | eb0f0ce0 | Michael Hanselmann | |
2454 | eb0f0ce0 | Michael Hanselmann | |
2455 | eb0f0ce0 | Michael Hanselmann | def LockFile(fd): |
2456 | eb0f0ce0 | Michael Hanselmann | """Locks a file using POSIX locks.
|
2457 | eb0f0ce0 | Michael Hanselmann |
|
2458 | 58885d79 | Iustin Pop | @type fd: int
|
2459 | 58885d79 | Iustin Pop | @param fd: the file descriptor we need to lock
|
2460 | 58885d79 | Iustin Pop |
|
2461 | eb0f0ce0 | Michael Hanselmann | """
|
2462 | eb0f0ce0 | Michael Hanselmann | try:
|
2463 | eb0f0ce0 | Michael Hanselmann | fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) |
2464 | eb0f0ce0 | Michael Hanselmann | except IOError, err: |
2465 | eb0f0ce0 | Michael Hanselmann | if err.errno == errno.EAGAIN:
|
2466 | eb0f0ce0 | Michael Hanselmann | raise errors.LockError("File already locked") |
2467 | eb0f0ce0 | Michael Hanselmann | raise
|
2468 | de499029 | Michael Hanselmann | |
2469 | de499029 | Michael Hanselmann | |
2470 | 3b813dd2 | Iustin Pop | def FormatTime(val): |
2471 | 3b813dd2 | Iustin Pop | """Formats a time value.
|
2472 | 3b813dd2 | Iustin Pop |
|
2473 | 3b813dd2 | Iustin Pop | @type val: float or None
|
2474 | 3b813dd2 | Iustin Pop | @param val: the timestamp as returned by time.time()
|
2475 | 3b813dd2 | Iustin Pop | @return: a string value or N/A if we don't have a valid timestamp
|
2476 | 3b813dd2 | Iustin Pop |
|
2477 | 3b813dd2 | Iustin Pop | """
|
2478 | 3b813dd2 | Iustin Pop | if val is None or not isinstance(val, (int, float)): |
2479 | 3b813dd2 | Iustin Pop | return "N/A" |
2480 | 3b813dd2 | Iustin Pop | # these two codes works on Linux, but they are not guaranteed on all
|
2481 | 3b813dd2 | Iustin Pop | # platforms
|
2482 | 3b813dd2 | Iustin Pop | return time.strftime("%F %T", time.localtime(val)) |
2483 | 3b813dd2 | Iustin Pop | |
2484 | 3b813dd2 | Iustin Pop | |
2485 | 5cbe43a5 | Michael Hanselmann | def ReadWatcherPauseFile(filename, now=None, remove_after=3600): |
2486 | 05e50653 | Michael Hanselmann | """Reads the watcher pause file.
|
2487 | 05e50653 | Michael Hanselmann |
|
2488 | 5cbe43a5 | Michael Hanselmann | @type filename: string
|
2489 | 5cbe43a5 | Michael Hanselmann | @param filename: Path to watcher pause file
|
2490 | 5cbe43a5 | Michael Hanselmann | @type now: None, float or int
|
2491 | 5cbe43a5 | Michael Hanselmann | @param now: Current time as Unix timestamp
|
2492 | 5cbe43a5 | Michael Hanselmann | @type remove_after: int
|
2493 | 5cbe43a5 | Michael Hanselmann | @param remove_after: Remove watcher pause file after specified amount of
|
2494 | 5cbe43a5 | Michael Hanselmann | seconds past the pause end time
|
2495 | 5cbe43a5 | Michael Hanselmann |
|
2496 | 05e50653 | Michael Hanselmann | """
|
2497 | 05e50653 | Michael Hanselmann | if now is None: |
2498 | 05e50653 | Michael Hanselmann | now = time.time() |
2499 | 05e50653 | Michael Hanselmann | |
2500 | 05e50653 | Michael Hanselmann | try:
|
2501 | 05e50653 | Michael Hanselmann | value = ReadFile(filename) |
2502 | 05e50653 | Michael Hanselmann | except IOError, err: |
2503 | 05e50653 | Michael Hanselmann | if err.errno != errno.ENOENT:
|
2504 | 05e50653 | Michael Hanselmann | raise
|
2505 | 05e50653 | Michael Hanselmann | value = None
|
2506 | 05e50653 | Michael Hanselmann | |
2507 | 05e50653 | Michael Hanselmann | if value is not None: |
2508 | 05e50653 | Michael Hanselmann | try:
|
2509 | 05e50653 | Michael Hanselmann | value = int(value)
|
2510 | 05e50653 | Michael Hanselmann | except ValueError: |
2511 | 5cbe43a5 | Michael Hanselmann | logging.warning(("Watcher pause file (%s) contains invalid value,"
|
2512 | 5cbe43a5 | Michael Hanselmann | " removing it"), filename)
|
2513 | 5cbe43a5 | Michael Hanselmann | RemoveFile(filename) |
2514 | 05e50653 | Michael Hanselmann | value = None
|
2515 | 05e50653 | Michael Hanselmann | |
2516 | 05e50653 | Michael Hanselmann | if value is not None: |
2517 | 5cbe43a5 | Michael Hanselmann | # Remove file if it's outdated
|
2518 | 5cbe43a5 | Michael Hanselmann | if now > (value + remove_after):
|
2519 | 5cbe43a5 | Michael Hanselmann | RemoveFile(filename) |
2520 | 5cbe43a5 | Michael Hanselmann | value = None
|
2521 | 5cbe43a5 | Michael Hanselmann | |
2522 | 5cbe43a5 | Michael Hanselmann | elif now > value:
|
2523 | 05e50653 | Michael Hanselmann | value = None
|
2524 | 05e50653 | Michael Hanselmann | |
2525 | 05e50653 | Michael Hanselmann | return value
|
2526 | 05e50653 | Michael Hanselmann | |
2527 | 05e50653 | Michael Hanselmann | |
2528 | de0ea66b | Michael Hanselmann | class RetryTimeout(Exception): |
2529 | de0ea66b | Michael Hanselmann | """Retry loop timed out.
|
2530 | de0ea66b | Michael Hanselmann |
|
2531 | 40bc67e1 | Guido Trotter | Any arguments which was passed by the retried function to RetryAgain will be
|
2532 | 40bc67e1 | Guido Trotter | preserved in RetryTimeout, if it is raised. If such argument was an exception
|
2533 | 40bc67e1 | Guido Trotter | the RaiseInner helper method will reraise it.
|
2534 | 40bc67e1 | Guido Trotter |
|
2535 | de0ea66b | Michael Hanselmann | """
|
2536 | 506be7c5 | Guido Trotter | def RaiseInner(self): |
2537 | 506be7c5 | Guido Trotter | if self.args and isinstance(self.args[0], Exception): |
2538 | 506be7c5 | Guido Trotter | raise self.args[0] |
2539 | 506be7c5 | Guido Trotter | else:
|
2540 | 506be7c5 | Guido Trotter | raise RetryTimeout(*self.args) |
2541 | de0ea66b | Michael Hanselmann | |
2542 | de0ea66b | Michael Hanselmann | |
2543 | de0ea66b | Michael Hanselmann | class RetryAgain(Exception): |
2544 | de0ea66b | Michael Hanselmann | """Retry again.
|
2545 | de0ea66b | Michael Hanselmann |
|
2546 | 40bc67e1 | Guido Trotter | Any arguments passed to RetryAgain will be preserved, if a timeout occurs, as
|
2547 | 40bc67e1 | Guido Trotter | arguments to RetryTimeout. If an exception is passed, the RaiseInner() method
|
2548 | 40bc67e1 | Guido Trotter | of the RetryTimeout() method can be used to reraise it.
|
2549 | 40bc67e1 | Guido Trotter |
|
2550 | de0ea66b | Michael Hanselmann | """
|
2551 | de0ea66b | Michael Hanselmann | |
2552 | de0ea66b | Michael Hanselmann | |
2553 | de0ea66b | Michael Hanselmann | class _RetryDelayCalculator(object): |
2554 | de0ea66b | Michael Hanselmann | """Calculator for increasing delays.
|
2555 | de0ea66b | Michael Hanselmann |
|
2556 | de0ea66b | Michael Hanselmann | """
|
2557 | de0ea66b | Michael Hanselmann | __slots__ = [ |
2558 | de0ea66b | Michael Hanselmann | "_factor",
|
2559 | de0ea66b | Michael Hanselmann | "_limit",
|
2560 | de0ea66b | Michael Hanselmann | "_next",
|
2561 | de0ea66b | Michael Hanselmann | "_start",
|
2562 | de0ea66b | Michael Hanselmann | ] |
2563 | de0ea66b | Michael Hanselmann | |
2564 | de0ea66b | Michael Hanselmann | def __init__(self, start, factor, limit): |
2565 | de0ea66b | Michael Hanselmann | """Initializes this class.
|
2566 | de0ea66b | Michael Hanselmann |
|
2567 | de0ea66b | Michael Hanselmann | @type start: float
|
2568 | de0ea66b | Michael Hanselmann | @param start: Initial delay
|
2569 | de0ea66b | Michael Hanselmann | @type factor: float
|
2570 | de0ea66b | Michael Hanselmann | @param factor: Factor for delay increase
|
2571 | de0ea66b | Michael Hanselmann | @type limit: float or None
|
2572 | de0ea66b | Michael Hanselmann | @param limit: Upper limit for delay or None for no limit
|
2573 | de0ea66b | Michael Hanselmann |
|
2574 | de0ea66b | Michael Hanselmann | """
|
2575 | de0ea66b | Michael Hanselmann | assert start > 0.0 |
2576 | de0ea66b | Michael Hanselmann | assert factor >= 1.0 |
2577 | de0ea66b | Michael Hanselmann | assert limit is None or limit >= 0.0 |
2578 | de0ea66b | Michael Hanselmann | |
2579 | de0ea66b | Michael Hanselmann | self._start = start
|
2580 | de0ea66b | Michael Hanselmann | self._factor = factor
|
2581 | de0ea66b | Michael Hanselmann | self._limit = limit
|
2582 | de0ea66b | Michael Hanselmann | |
2583 | de0ea66b | Michael Hanselmann | self._next = start
|
2584 | de0ea66b | Michael Hanselmann | |
2585 | de0ea66b | Michael Hanselmann | def __call__(self): |
2586 | de0ea66b | Michael Hanselmann | """Returns current delay and calculates the next one.
|
2587 | de0ea66b | Michael Hanselmann |
|
2588 | de0ea66b | Michael Hanselmann | """
|
2589 | de0ea66b | Michael Hanselmann | current = self._next
|
2590 | de0ea66b | Michael Hanselmann | |
2591 | de0ea66b | Michael Hanselmann | # Update for next run
|
2592 | de0ea66b | Michael Hanselmann | if self._limit is None or self._next < self._limit: |
2593 | 26751075 | Michael Hanselmann | self._next = min(self._limit, self._next * self._factor) |
2594 | de0ea66b | Michael Hanselmann | |
2595 | de0ea66b | Michael Hanselmann | return current
|
2596 | de0ea66b | Michael Hanselmann | |
2597 | de0ea66b | Michael Hanselmann | |
2598 | de0ea66b | Michael Hanselmann | #: Special delay to specify whole remaining timeout
|
2599 | de0ea66b | Michael Hanselmann | RETRY_REMAINING_TIME = object()
|
2600 | de0ea66b | Michael Hanselmann | |
2601 | de0ea66b | Michael Hanselmann | |
2602 | de0ea66b | Michael Hanselmann | def Retry(fn, delay, timeout, args=None, wait_fn=time.sleep, |
2603 | de0ea66b | Michael Hanselmann | _time_fn=time.time): |
2604 | de0ea66b | Michael Hanselmann | """Call a function repeatedly until it succeeds.
|
2605 | de0ea66b | Michael Hanselmann |
|
2606 | de0ea66b | Michael Hanselmann | The function C{fn} is called repeatedly until it doesn't throw L{RetryAgain}
|
2607 | de0ea66b | Michael Hanselmann | anymore. Between calls a delay, specified by C{delay}, is inserted. After a
|
2608 | de0ea66b | Michael Hanselmann | total of C{timeout} seconds, this function throws L{RetryTimeout}.
|
2609 | de0ea66b | Michael Hanselmann |
|
2610 | de0ea66b | Michael Hanselmann | C{delay} can be one of the following:
|
2611 | de0ea66b | Michael Hanselmann | - callable returning the delay length as a float
|
2612 | de0ea66b | Michael Hanselmann | - Tuple of (start, factor, limit)
|
2613 | de0ea66b | Michael Hanselmann | - L{RETRY_REMAINING_TIME} to sleep until the timeout expires (this is
|
2614 | de0ea66b | Michael Hanselmann | useful when overriding L{wait_fn} to wait for an external event)
|
2615 | de0ea66b | Michael Hanselmann | - A static delay as a number (int or float)
|
2616 | de0ea66b | Michael Hanselmann |
|
2617 | de0ea66b | Michael Hanselmann | @type fn: callable
|
2618 | de0ea66b | Michael Hanselmann | @param fn: Function to be called
|
2619 | de0ea66b | Michael Hanselmann | @param delay: Either a callable (returning the delay), a tuple of (start,
|
2620 | de0ea66b | Michael Hanselmann | factor, limit) (see L{_RetryDelayCalculator}),
|
2621 | de0ea66b | Michael Hanselmann | L{RETRY_REMAINING_TIME} or a number (int or float)
|
2622 | de0ea66b | Michael Hanselmann | @type timeout: float
|
2623 | de0ea66b | Michael Hanselmann | @param timeout: Total timeout
|
2624 | de0ea66b | Michael Hanselmann | @type wait_fn: callable
|
2625 | de0ea66b | Michael Hanselmann | @param wait_fn: Waiting function
|
2626 | de0ea66b | Michael Hanselmann | @return: Return value of function
|
2627 | de0ea66b | Michael Hanselmann |
|
2628 | de0ea66b | Michael Hanselmann | """
|
2629 | de0ea66b | Michael Hanselmann | assert callable(fn) |
2630 | de0ea66b | Michael Hanselmann | assert callable(wait_fn) |
2631 | de0ea66b | Michael Hanselmann | assert callable(_time_fn) |
2632 | de0ea66b | Michael Hanselmann | |
2633 | de0ea66b | Michael Hanselmann | if args is None: |
2634 | de0ea66b | Michael Hanselmann | args = [] |
2635 | de0ea66b | Michael Hanselmann | |
2636 | de0ea66b | Michael Hanselmann | end_time = _time_fn() + timeout |
2637 | de0ea66b | Michael Hanselmann | |
2638 | de0ea66b | Michael Hanselmann | if callable(delay): |
2639 | de0ea66b | Michael Hanselmann | # External function to calculate delay
|
2640 | de0ea66b | Michael Hanselmann | calc_delay = delay |
2641 | de0ea66b | Michael Hanselmann | |
2642 | de0ea66b | Michael Hanselmann | elif isinstance(delay, (tuple, list)): |
2643 | de0ea66b | Michael Hanselmann | # Increasing delay with optional upper boundary
|
2644 | de0ea66b | Michael Hanselmann | (start, factor, limit) = delay |
2645 | de0ea66b | Michael Hanselmann | calc_delay = _RetryDelayCalculator(start, factor, limit) |
2646 | de0ea66b | Michael Hanselmann | |
2647 | de0ea66b | Michael Hanselmann | elif delay is RETRY_REMAINING_TIME: |
2648 | de0ea66b | Michael Hanselmann | # Always use the remaining time
|
2649 | de0ea66b | Michael Hanselmann | calc_delay = None
|
2650 | de0ea66b | Michael Hanselmann | |
2651 | de0ea66b | Michael Hanselmann | else:
|
2652 | de0ea66b | Michael Hanselmann | # Static delay
|
2653 | de0ea66b | Michael Hanselmann | calc_delay = lambda: delay
|
2654 | de0ea66b | Michael Hanselmann | |
2655 | de0ea66b | Michael Hanselmann | assert calc_delay is None or callable(calc_delay) |
2656 | de0ea66b | Michael Hanselmann | |
2657 | de0ea66b | Michael Hanselmann | while True: |
2658 | 506be7c5 | Guido Trotter | retry_args = [] |
2659 | de0ea66b | Michael Hanselmann | try:
|
2660 | 7260cfbe | Iustin Pop | # pylint: disable-msg=W0142
|
2661 | de0ea66b | Michael Hanselmann | return fn(*args)
|
2662 | 506be7c5 | Guido Trotter | except RetryAgain, err:
|
2663 | 506be7c5 | Guido Trotter | retry_args = err.args |
2664 | 1b429e2a | Iustin Pop | except RetryTimeout:
|
2665 | 1b429e2a | Iustin Pop | raise errors.ProgrammerError("Nested retry loop detected that didn't" |
2666 | 1b429e2a | Iustin Pop | " handle RetryTimeout")
|
2667 | de0ea66b | Michael Hanselmann | |
2668 | de0ea66b | Michael Hanselmann | remaining_time = end_time - _time_fn() |
2669 | de0ea66b | Michael Hanselmann | |
2670 | de0ea66b | Michael Hanselmann | if remaining_time < 0.0: |
2671 | 506be7c5 | Guido Trotter | # pylint: disable-msg=W0142
|
2672 | 506be7c5 | Guido Trotter | raise RetryTimeout(*retry_args)
|
2673 | de0ea66b | Michael Hanselmann | |
2674 | de0ea66b | Michael Hanselmann | assert remaining_time >= 0.0 |
2675 | de0ea66b | Michael Hanselmann | |
2676 | de0ea66b | Michael Hanselmann | if calc_delay is None: |
2677 | de0ea66b | Michael Hanselmann | wait_fn(remaining_time) |
2678 | de0ea66b | Michael Hanselmann | else:
|
2679 | de0ea66b | Michael Hanselmann | current_delay = calc_delay() |
2680 | de0ea66b | Michael Hanselmann | if current_delay > 0.0: |
2681 | de0ea66b | Michael Hanselmann | wait_fn(current_delay) |
2682 | de0ea66b | Michael Hanselmann | |
2683 | de0ea66b | Michael Hanselmann | |
2684 | a87b4824 | Michael Hanselmann | class FileLock(object): |
2685 | a87b4824 | Michael Hanselmann | """Utility class for file locks.
|
2686 | a87b4824 | Michael Hanselmann |
|
2687 | a87b4824 | Michael Hanselmann | """
|
2688 | b4478d34 | Michael Hanselmann | def __init__(self, fd, filename): |
2689 | 58885d79 | Iustin Pop | """Constructor for FileLock.
|
2690 | 58885d79 | Iustin Pop |
|
2691 | b4478d34 | Michael Hanselmann | @type fd: file
|
2692 | b4478d34 | Michael Hanselmann | @param fd: File object
|
2693 | 58885d79 | Iustin Pop | @type filename: str
|
2694 | b4478d34 | Michael Hanselmann | @param filename: Path of the file opened at I{fd}
|
2695 | 58885d79 | Iustin Pop |
|
2696 | 58885d79 | Iustin Pop | """
|
2697 | b4478d34 | Michael Hanselmann | self.fd = fd
|
2698 | a87b4824 | Michael Hanselmann | self.filename = filename
|
2699 | b4478d34 | Michael Hanselmann | |
2700 | b4478d34 | Michael Hanselmann | @classmethod
|
2701 | b4478d34 | Michael Hanselmann | def Open(cls, filename): |
2702 | b4478d34 | Michael Hanselmann | """Creates and opens a file to be used as a file-based lock.
|
2703 | b4478d34 | Michael Hanselmann |
|
2704 | b4478d34 | Michael Hanselmann | @type filename: string
|
2705 | b4478d34 | Michael Hanselmann | @param filename: path to the file to be locked
|
2706 | b4478d34 | Michael Hanselmann |
|
2707 | b4478d34 | Michael Hanselmann | """
|
2708 | b4478d34 | Michael Hanselmann | # Using "os.open" is necessary to allow both opening existing file
|
2709 | b4478d34 | Michael Hanselmann | # read/write and creating if not existing. Vanilla "open" will truncate an
|
2710 | b4478d34 | Michael Hanselmann | # existing file -or- allow creating if not existing.
|
2711 | b4478d34 | Michael Hanselmann | return cls(os.fdopen(os.open(filename, os.O_RDWR | os.O_CREAT), "w+"), |
2712 | b4478d34 | Michael Hanselmann | filename) |
2713 | a87b4824 | Michael Hanselmann | |
2714 | a87b4824 | Michael Hanselmann | def __del__(self): |
2715 | a87b4824 | Michael Hanselmann | self.Close()
|
2716 | a87b4824 | Michael Hanselmann | |
2717 | a87b4824 | Michael Hanselmann | def Close(self): |
2718 | 58885d79 | Iustin Pop | """Close the file and release the lock.
|
2719 | 58885d79 | Iustin Pop |
|
2720 | 58885d79 | Iustin Pop | """
|
2721 | aac3fbf0 | Iustin Pop | if hasattr(self, "fd") and self.fd: |
2722 | a87b4824 | Michael Hanselmann | self.fd.close()
|
2723 | a87b4824 | Michael Hanselmann | self.fd = None |
2724 | a87b4824 | Michael Hanselmann | |
2725 | aa74b828 | Michael Hanselmann | def _flock(self, flag, blocking, timeout, errmsg): |
2726 | aa74b828 | Michael Hanselmann | """Wrapper for fcntl.flock.
|
2727 | aa74b828 | Michael Hanselmann |
|
2728 | aa74b828 | Michael Hanselmann | @type flag: int
|
2729 | 58885d79 | Iustin Pop | @param flag: operation flag
|
2730 | aa74b828 | Michael Hanselmann | @type blocking: bool
|
2731 | 58885d79 | Iustin Pop | @param blocking: whether the operation should be done in blocking mode.
|
2732 | aa74b828 | Michael Hanselmann | @type timeout: None or float
|
2733 | 58885d79 | Iustin Pop | @param timeout: for how long the operation should be retried (implies
|
2734 | aa74b828 | Michael Hanselmann | non-blocking mode).
|
2735 | aa74b828 | Michael Hanselmann | @type errmsg: string
|
2736 | 58885d79 | Iustin Pop | @param errmsg: error message in case operation fails.
|
2737 | aa74b828 | Michael Hanselmann |
|
2738 | aa74b828 | Michael Hanselmann | """
|
2739 | a87b4824 | Michael Hanselmann | assert self.fd, "Lock was closed" |
2740 | aa74b828 | Michael Hanselmann | assert timeout is None or timeout >= 0, \ |
2741 | aa74b828 | Michael Hanselmann | "If specified, timeout must be positive"
|
2742 | cc4c9b91 | Michael Hanselmann | assert not (flag & fcntl.LOCK_NB), "LOCK_NB must not be set" |
2743 | a87b4824 | Michael Hanselmann | |
2744 | cc4c9b91 | Michael Hanselmann | # When a timeout is used, LOCK_NB must always be set
|
2745 | cc4c9b91 | Michael Hanselmann | if not (timeout is None and blocking): |
2746 | a87b4824 | Michael Hanselmann | flag |= fcntl.LOCK_NB |
2747 | a87b4824 | Michael Hanselmann | |
2748 | cc4c9b91 | Michael Hanselmann | if timeout is None: |
2749 | cc4c9b91 | Michael Hanselmann | self._Lock(self.fd, flag, timeout) |
2750 | cc4c9b91 | Michael Hanselmann | else:
|
2751 | cc4c9b91 | Michael Hanselmann | try:
|
2752 | cc4c9b91 | Michael Hanselmann | Retry(self._Lock, (0.1, 1.2, 1.0), timeout, |
2753 | cc4c9b91 | Michael Hanselmann | args=(self.fd, flag, timeout))
|
2754 | cc4c9b91 | Michael Hanselmann | except RetryTimeout:
|
2755 | cc4c9b91 | Michael Hanselmann | raise errors.LockError(errmsg)
|
2756 | aa74b828 | Michael Hanselmann | |
2757 | cc4c9b91 | Michael Hanselmann | @staticmethod
|
2758 | cc4c9b91 | Michael Hanselmann | def _Lock(fd, flag, timeout): |
2759 | cc4c9b91 | Michael Hanselmann | try:
|
2760 | cc4c9b91 | Michael Hanselmann | fcntl.flock(fd, flag) |
2761 | cc4c9b91 | Michael Hanselmann | except IOError, err: |
2762 | cc4c9b91 | Michael Hanselmann | if timeout is not None and err.errno == errno.EAGAIN: |
2763 | cc4c9b91 | Michael Hanselmann | raise RetryAgain()
|
2764 | 31892b4c | Michael Hanselmann | |
2765 | cc4c9b91 | Michael Hanselmann | logging.exception("fcntl.flock failed")
|
2766 | cc4c9b91 | Michael Hanselmann | raise
|
2767 | aa74b828 | Michael Hanselmann | |
2768 | aa74b828 | Michael Hanselmann | def Exclusive(self, blocking=False, timeout=None): |
2769 | a87b4824 | Michael Hanselmann | """Locks the file in exclusive mode.
|
2770 | a87b4824 | Michael Hanselmann |
|
2771 | 58885d79 | Iustin Pop | @type blocking: boolean
|
2772 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
2773 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
2774 | 58885d79 | Iustin Pop | @type timeout: int or None
|
2775 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
2776 | 58885d79 | Iustin Pop | (in blocking mode)
|
2777 | 58885d79 | Iustin Pop |
|
2778 | a87b4824 | Michael Hanselmann | """
|
2779 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_EX, blocking, timeout,
|
2780 | a87b4824 | Michael Hanselmann | "Failed to lock %s in exclusive mode" % self.filename) |
2781 | a87b4824 | Michael Hanselmann | |
2782 | aa74b828 | Michael Hanselmann | def Shared(self, blocking=False, timeout=None): |
2783 | a87b4824 | Michael Hanselmann | """Locks the file in shared mode.
|
2784 | a87b4824 | Michael Hanselmann |
|
2785 | 58885d79 | Iustin Pop | @type blocking: boolean
|
2786 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
2787 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
2788 | 58885d79 | Iustin Pop | @type timeout: int or None
|
2789 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
2790 | 58885d79 | Iustin Pop | (in blocking mode)
|
2791 | 58885d79 | Iustin Pop |
|
2792 | a87b4824 | Michael Hanselmann | """
|
2793 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_SH, blocking, timeout,
|
2794 | a87b4824 | Michael Hanselmann | "Failed to lock %s in shared mode" % self.filename) |
2795 | a87b4824 | Michael Hanselmann | |
2796 | aa74b828 | Michael Hanselmann | def Unlock(self, blocking=True, timeout=None): |
2797 | a87b4824 | Michael Hanselmann | """Unlocks the file.
|
2798 | a87b4824 | Michael Hanselmann |
|
2799 | 58885d79 | Iustin Pop | According to C{flock(2)}, unlocking can also be a nonblocking
|
2800 | 58885d79 | Iustin Pop | operation::
|
2801 | 58885d79 | Iustin Pop |
|
2802 | 58885d79 | Iustin Pop | To make a non-blocking request, include LOCK_NB with any of the above
|
2803 | 58885d79 | Iustin Pop | operations.
|
2804 | 58885d79 | Iustin Pop |
|
2805 | 58885d79 | Iustin Pop | @type blocking: boolean
|
2806 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
2807 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
2808 | 58885d79 | Iustin Pop | @type timeout: int or None
|
2809 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
2810 | 58885d79 | Iustin Pop | (in blocking mode)
|
2811 | a87b4824 | Michael Hanselmann |
|
2812 | a87b4824 | Michael Hanselmann | """
|
2813 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_UN, blocking, timeout,
|
2814 | a87b4824 | Michael Hanselmann | "Failed to unlock %s" % self.filename) |
2815 | a87b4824 | Michael Hanselmann | |
2816 | a87b4824 | Michael Hanselmann | |
2817 | 339be5a8 | Michael Hanselmann | class LineSplitter: |
2818 | 339be5a8 | Michael Hanselmann | """Splits data chunks into lines separated by newline.
|
2819 | 339be5a8 | Michael Hanselmann |
|
2820 | 339be5a8 | Michael Hanselmann | Instances provide a file-like interface.
|
2821 | 339be5a8 | Michael Hanselmann |
|
2822 | 339be5a8 | Michael Hanselmann | """
|
2823 | 339be5a8 | Michael Hanselmann | def __init__(self, line_fn, *args): |
2824 | 339be5a8 | Michael Hanselmann | """Initializes this class.
|
2825 | 339be5a8 | Michael Hanselmann |
|
2826 | 339be5a8 | Michael Hanselmann | @type line_fn: callable
|
2827 | 339be5a8 | Michael Hanselmann | @param line_fn: Function called for each line, first parameter is line
|
2828 | 339be5a8 | Michael Hanselmann | @param args: Extra arguments for L{line_fn}
|
2829 | 339be5a8 | Michael Hanselmann |
|
2830 | 339be5a8 | Michael Hanselmann | """
|
2831 | 339be5a8 | Michael Hanselmann | assert callable(line_fn) |
2832 | 339be5a8 | Michael Hanselmann | |
2833 | 339be5a8 | Michael Hanselmann | if args:
|
2834 | 339be5a8 | Michael Hanselmann | # Python 2.4 doesn't have functools.partial yet
|
2835 | 339be5a8 | Michael Hanselmann | self._line_fn = \
|
2836 | 339be5a8 | Michael Hanselmann | lambda line: line_fn(line, *args) # pylint: disable-msg=W0142 |
2837 | 339be5a8 | Michael Hanselmann | else:
|
2838 | 339be5a8 | Michael Hanselmann | self._line_fn = line_fn
|
2839 | 339be5a8 | Michael Hanselmann | |
2840 | 339be5a8 | Michael Hanselmann | self._lines = collections.deque()
|
2841 | 339be5a8 | Michael Hanselmann | self._buffer = "" |
2842 | 339be5a8 | Michael Hanselmann | |
2843 | 339be5a8 | Michael Hanselmann | def write(self, data): |
2844 | 339be5a8 | Michael Hanselmann | parts = (self._buffer + data).split("\n") |
2845 | 339be5a8 | Michael Hanselmann | self._buffer = parts.pop()
|
2846 | 339be5a8 | Michael Hanselmann | self._lines.extend(parts)
|
2847 | 339be5a8 | Michael Hanselmann | |
2848 | 339be5a8 | Michael Hanselmann | def flush(self): |
2849 | 339be5a8 | Michael Hanselmann | while self._lines: |
2850 | 339be5a8 | Michael Hanselmann | self._line_fn(self._lines.popleft().rstrip("\r\n")) |
2851 | 339be5a8 | Michael Hanselmann | |
2852 | 339be5a8 | Michael Hanselmann | def close(self): |
2853 | 339be5a8 | Michael Hanselmann | self.flush()
|
2854 | 339be5a8 | Michael Hanselmann | if self._buffer: |
2855 | 339be5a8 | Michael Hanselmann | self._line_fn(self._buffer) |
2856 | 339be5a8 | Michael Hanselmann | |
2857 | 339be5a8 | Michael Hanselmann | |
2858 | 451575de | Guido Trotter | def SignalHandled(signums): |
2859 | 451575de | Guido Trotter | """Signal Handled decoration.
|
2860 | 451575de | Guido Trotter |
|
2861 | 451575de | Guido Trotter | This special decorator installs a signal handler and then calls the target
|
2862 | 451575de | Guido Trotter | function. The function must accept a 'signal_handlers' keyword argument,
|
2863 | 451575de | Guido Trotter | which will contain a dict indexed by signal number, with SignalHandler
|
2864 | 451575de | Guido Trotter | objects as values.
|
2865 | 451575de | Guido Trotter |
|
2866 | 451575de | Guido Trotter | The decorator can be safely stacked with iself, to handle multiple signals
|
2867 | 451575de | Guido Trotter | with different handlers.
|
2868 | 451575de | Guido Trotter |
|
2869 | 451575de | Guido Trotter | @type signums: list
|
2870 | 451575de | Guido Trotter | @param signums: signals to intercept
|
2871 | 451575de | Guido Trotter |
|
2872 | 451575de | Guido Trotter | """
|
2873 | 451575de | Guido Trotter | def wrap(fn): |
2874 | 451575de | Guido Trotter | def sig_function(*args, **kwargs): |
2875 | 451575de | Guido Trotter | assert 'signal_handlers' not in kwargs or \ |
2876 | 451575de | Guido Trotter | kwargs['signal_handlers'] is None or \ |
2877 | 451575de | Guido Trotter | isinstance(kwargs['signal_handlers'], dict), \ |
2878 | 451575de | Guido Trotter | "Wrong signal_handlers parameter in original function call"
|
2879 | 451575de | Guido Trotter | if 'signal_handlers' in kwargs and kwargs['signal_handlers'] is not None: |
2880 | 451575de | Guido Trotter | signal_handlers = kwargs['signal_handlers']
|
2881 | 451575de | Guido Trotter | else:
|
2882 | 451575de | Guido Trotter | signal_handlers = {} |
2883 | 451575de | Guido Trotter | kwargs['signal_handlers'] = signal_handlers
|
2884 | 451575de | Guido Trotter | sighandler = SignalHandler(signums) |
2885 | 451575de | Guido Trotter | try:
|
2886 | 451575de | Guido Trotter | for sig in signums: |
2887 | 451575de | Guido Trotter | signal_handlers[sig] = sighandler |
2888 | 451575de | Guido Trotter | return fn(*args, **kwargs)
|
2889 | 451575de | Guido Trotter | finally:
|
2890 | 451575de | Guido Trotter | sighandler.Reset() |
2891 | 451575de | Guido Trotter | return sig_function
|
2892 | 451575de | Guido Trotter | return wrap
|
2893 | 451575de | Guido Trotter | |
2894 | 451575de | Guido Trotter | |
2895 | de499029 | Michael Hanselmann | class SignalHandler(object): |
2896 | de499029 | Michael Hanselmann | """Generic signal handler class.
|
2897 | de499029 | Michael Hanselmann |
|
2898 | 58885d79 | Iustin Pop | It automatically restores the original handler when deconstructed or
|
2899 | 58885d79 | Iustin Pop | when L{Reset} is called. You can either pass your own handler
|
2900 | 58885d79 | Iustin Pop | function in or query the L{called} attribute to detect whether the
|
2901 | 58885d79 | Iustin Pop | signal was sent.
|
2902 | 58885d79 | Iustin Pop |
|
2903 | 58885d79 | Iustin Pop | @type signum: list
|
2904 | 58885d79 | Iustin Pop | @ivar signum: the signals we handle
|
2905 | 58885d79 | Iustin Pop | @type called: boolean
|
2906 | 58885d79 | Iustin Pop | @ivar called: tracks whether any of the signals have been raised
|
2907 | de499029 | Michael Hanselmann |
|
2908 | de499029 | Michael Hanselmann | """
|
2909 | de499029 | Michael Hanselmann | def __init__(self, signum): |
2910 | de499029 | Michael Hanselmann | """Constructs a new SignalHandler instance.
|
2911 | de499029 | Michael Hanselmann |
|
2912 | 58885d79 | Iustin Pop | @type signum: int or list of ints
|
2913 | de499029 | Michael Hanselmann | @param signum: Single signal number or set of signal numbers
|
2914 | de499029 | Michael Hanselmann |
|
2915 | de499029 | Michael Hanselmann | """
|
2916 | 6c52849e | Guido Trotter | self.signum = set(signum) |
2917 | de499029 | Michael Hanselmann | self.called = False |
2918 | de499029 | Michael Hanselmann | |
2919 | de499029 | Michael Hanselmann | self._previous = {}
|
2920 | de499029 | Michael Hanselmann | try:
|
2921 | de499029 | Michael Hanselmann | for signum in self.signum: |
2922 | de499029 | Michael Hanselmann | # Setup handler
|
2923 | de499029 | Michael Hanselmann | prev_handler = signal.signal(signum, self._HandleSignal)
|
2924 | de499029 | Michael Hanselmann | try:
|
2925 | de499029 | Michael Hanselmann | self._previous[signum] = prev_handler
|
2926 | de499029 | Michael Hanselmann | except:
|
2927 | de499029 | Michael Hanselmann | # Restore previous handler
|
2928 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
2929 | de499029 | Michael Hanselmann | raise
|
2930 | de499029 | Michael Hanselmann | except:
|
2931 | de499029 | Michael Hanselmann | # Reset all handlers
|
2932 | de499029 | Michael Hanselmann | self.Reset()
|
2933 | de499029 | Michael Hanselmann | # Here we have a race condition: a handler may have already been called,
|
2934 | de499029 | Michael Hanselmann | # but there's not much we can do about it at this point.
|
2935 | de499029 | Michael Hanselmann | raise
|
2936 | de499029 | Michael Hanselmann | |
2937 | de499029 | Michael Hanselmann | def __del__(self): |
2938 | de499029 | Michael Hanselmann | self.Reset()
|
2939 | de499029 | Michael Hanselmann | |
2940 | de499029 | Michael Hanselmann | def Reset(self): |
2941 | de499029 | Michael Hanselmann | """Restore previous handler.
|
2942 | de499029 | Michael Hanselmann |
|
2943 | 58885d79 | Iustin Pop | This will reset all the signals to their previous handlers.
|
2944 | 58885d79 | Iustin Pop |
|
2945 | de499029 | Michael Hanselmann | """
|
2946 | de499029 | Michael Hanselmann | for signum, prev_handler in self._previous.items(): |
2947 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
2948 | de499029 | Michael Hanselmann | # If successful, remove from dict
|
2949 | de499029 | Michael Hanselmann | del self._previous[signum] |
2950 | de499029 | Michael Hanselmann | |
2951 | de499029 | Michael Hanselmann | def Clear(self): |
2952 | 58885d79 | Iustin Pop | """Unsets the L{called} flag.
|
2953 | de499029 | Michael Hanselmann |
|
2954 | de499029 | Michael Hanselmann | This function can be used in case a signal may arrive several times.
|
2955 | de499029 | Michael Hanselmann |
|
2956 | de499029 | Michael Hanselmann | """
|
2957 | de499029 | Michael Hanselmann | self.called = False |
2958 | de499029 | Michael Hanselmann | |
2959 | 2d54e29c | Iustin Pop | # we don't care about arguments, but we leave them named for the future
|
2960 | 2d54e29c | Iustin Pop | def _HandleSignal(self, signum, frame): # pylint: disable-msg=W0613 |
2961 | de499029 | Michael Hanselmann | """Actual signal handling function.
|
2962 | de499029 | Michael Hanselmann |
|
2963 | de499029 | Michael Hanselmann | """
|
2964 | de499029 | Michael Hanselmann | # This is not nice and not absolutely atomic, but it appears to be the only
|
2965 | de499029 | Michael Hanselmann | # solution in Python -- there are no atomic types.
|
2966 | de499029 | Michael Hanselmann | self.called = True |
2967 | a2d2e1a7 | Iustin Pop | |
2968 | a2d2e1a7 | Iustin Pop | |
2969 | a2d2e1a7 | Iustin Pop | class FieldSet(object): |
2970 | a2d2e1a7 | Iustin Pop | """A simple field set.
|
2971 | a2d2e1a7 | Iustin Pop |
|
2972 | a2d2e1a7 | Iustin Pop | Among the features are:
|
2973 | a2d2e1a7 | Iustin Pop | - checking if a string is among a list of static string or regex objects
|
2974 | a2d2e1a7 | Iustin Pop | - checking if a whole list of string matches
|
2975 | a2d2e1a7 | Iustin Pop | - returning the matching groups from a regex match
|
2976 | a2d2e1a7 | Iustin Pop |
|
2977 | a2d2e1a7 | Iustin Pop | Internally, all fields are held as regular expression objects.
|
2978 | a2d2e1a7 | Iustin Pop |
|
2979 | a2d2e1a7 | Iustin Pop | """
|
2980 | a2d2e1a7 | Iustin Pop | def __init__(self, *items): |
2981 | a2d2e1a7 | Iustin Pop | self.items = [re.compile("^%s$" % value) for value in items] |
2982 | a2d2e1a7 | Iustin Pop | |
2983 | a2d2e1a7 | Iustin Pop | def Extend(self, other_set): |
2984 | a2d2e1a7 | Iustin Pop | """Extend the field set with the items from another one"""
|
2985 | a2d2e1a7 | Iustin Pop | self.items.extend(other_set.items)
|
2986 | a2d2e1a7 | Iustin Pop | |
2987 | a2d2e1a7 | Iustin Pop | def Matches(self, field): |
2988 | a2d2e1a7 | Iustin Pop | """Checks if a field matches the current set
|
2989 | a2d2e1a7 | Iustin Pop |
|
2990 | a2d2e1a7 | Iustin Pop | @type field: str
|
2991 | a2d2e1a7 | Iustin Pop | @param field: the string to match
|
2992 | 6c881c52 | Iustin Pop | @return: either None or a regular expression match object
|
2993 | a2d2e1a7 | Iustin Pop |
|
2994 | a2d2e1a7 | Iustin Pop | """
|
2995 | a2d2e1a7 | Iustin Pop | for m in itertools.ifilter(None, (val.match(field) for val in self.items)): |
2996 | a2d2e1a7 | Iustin Pop | return m
|
2997 | 6c881c52 | Iustin Pop | return None |
2998 | a2d2e1a7 | Iustin Pop | |
2999 | a2d2e1a7 | Iustin Pop | def NonMatching(self, items): |
3000 | a2d2e1a7 | Iustin Pop | """Returns the list of fields not matching the current set
|
3001 | a2d2e1a7 | Iustin Pop |
|
3002 | a2d2e1a7 | Iustin Pop | @type items: list
|
3003 | a2d2e1a7 | Iustin Pop | @param items: the list of fields to check
|
3004 | a2d2e1a7 | Iustin Pop | @rtype: list
|
3005 | a2d2e1a7 | Iustin Pop | @return: list of non-matching fields
|
3006 | a2d2e1a7 | Iustin Pop |
|
3007 | a2d2e1a7 | Iustin Pop | """
|
3008 | a2d2e1a7 | Iustin Pop | return [val for val in items if not self.Matches(val)] |