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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 sys |
31 | a8083063 | Iustin Pop | import os |
32 | a8083063 | Iustin Pop | import sha |
33 | a8083063 | Iustin Pop | import time |
34 | 113b55aa | Iustin Pop | import subprocess |
35 | a8083063 | Iustin Pop | import re |
36 | a8083063 | Iustin Pop | import socket |
37 | a8083063 | Iustin Pop | import tempfile |
38 | a8083063 | Iustin Pop | import shutil |
39 | 4ca1b175 | Alexander Schreiber | import errno |
40 | 2f8b60b3 | Iustin Pop | import pwd |
41 | 78feb6fb | Guido Trotter | import itertools |
42 | 9c233417 | Iustin Pop | import select |
43 | 9c233417 | Iustin Pop | import fcntl |
44 | 8f765069 | Iustin Pop | import resource |
45 | bb698c1f | Iustin Pop | import logging |
46 | de499029 | Michael Hanselmann | import signal |
47 | 9c233417 | Iustin Pop | |
48 | 9c233417 | Iustin Pop | from cStringIO import StringIO |
49 | a8083063 | Iustin Pop | |
50 | a8083063 | Iustin Pop | from ganeti import errors |
51 | 3aecd2c7 | Iustin Pop | from ganeti import constants |
52 | a8083063 | Iustin Pop | |
53 | 16abfbc2 | Alexander Schreiber | |
54 | a8083063 | Iustin Pop | _locksheld = [] |
55 | a8083063 | Iustin Pop | _re_shell_unquoted = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
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56 | a8083063 | Iustin Pop | |
57 | f362096f | Iustin Pop | debug = False
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58 | e67bd559 | Michael Hanselmann | debug_locks = False
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59 | 58885d79 | Iustin Pop | |
60 | 58885d79 | Iustin Pop | #: when set to True, L{RunCmd} is disabled
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61 | b74159ee | Iustin Pop | no_fork = False
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62 | f362096f | Iustin Pop | |
63 | 7c0d6283 | Michael Hanselmann | |
64 | a8083063 | Iustin Pop | class RunResult(object): |
65 | 58885d79 | Iustin Pop | """Holds the result of running external programs.
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66 | 58885d79 | Iustin Pop |
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67 | 58885d79 | Iustin Pop | @type exit_code: int
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68 | 58885d79 | Iustin Pop | @ivar exit_code: the exit code of the program, or None (if the program
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69 | 58885d79 | Iustin Pop | didn't exit())
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70 | 58885d79 | Iustin Pop | @type signal: int or None
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71 | 58885d79 | Iustin Pop | @ivar signal: the signal that caused the program to finish, or None
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72 | 58885d79 | Iustin Pop | (if the program wasn't terminated by a signal)
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73 | 58885d79 | Iustin Pop | @type stdout: str
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74 | 58885d79 | Iustin Pop | @ivar stdout: the standard output of the program
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75 | 58885d79 | Iustin Pop | @type stderr: str
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76 | 58885d79 | Iustin Pop | @ivar stderr: the standard error of the program
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77 | 58885d79 | Iustin Pop | @type failed: boolean
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78 | 58885d79 | Iustin Pop | @ivar failed: True in case the program was
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79 | 58885d79 | Iustin Pop | terminated by a signal or exited with a non-zero exit code
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80 | 58885d79 | Iustin Pop | @ivar fail_reason: a string detailing the termination reason
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81 | a8083063 | Iustin Pop |
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82 | a8083063 | Iustin Pop | """
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83 | a8083063 | Iustin Pop | __slots__ = ["exit_code", "signal", "stdout", "stderr", |
84 | a8083063 | Iustin Pop | "failed", "fail_reason", "cmd"] |
85 | a8083063 | Iustin Pop | |
86 | a8083063 | Iustin Pop | |
87 | 38206f3c | Iustin Pop | def __init__(self, exit_code, signal_, stdout, stderr, cmd): |
88 | a8083063 | Iustin Pop | self.cmd = cmd
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89 | a8083063 | Iustin Pop | self.exit_code = exit_code
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90 | 38206f3c | Iustin Pop | self.signal = signal_
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91 | a8083063 | Iustin Pop | self.stdout = stdout
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92 | a8083063 | Iustin Pop | self.stderr = stderr
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93 | 38206f3c | Iustin Pop | self.failed = (signal_ is not None or exit_code != 0) |
94 | a8083063 | Iustin Pop | |
95 | a8083063 | Iustin Pop | if self.signal is not None: |
96 | a8083063 | Iustin Pop | self.fail_reason = "terminated by signal %s" % self.signal |
97 | a8083063 | Iustin Pop | elif self.exit_code is not None: |
98 | a8083063 | Iustin Pop | self.fail_reason = "exited with exit code %s" % self.exit_code |
99 | a8083063 | Iustin Pop | else:
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100 | a8083063 | Iustin Pop | self.fail_reason = "unable to determine termination reason" |
101 | a8083063 | Iustin Pop | |
102 | bb698c1f | Iustin Pop | if self.failed: |
103 | bb698c1f | Iustin Pop | logging.debug("Command '%s' failed (%s); output: %s",
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104 | bb698c1f | Iustin Pop | self.cmd, self.fail_reason, self.output) |
105 | f362096f | Iustin Pop | |
106 | a8083063 | Iustin Pop | def _GetOutput(self): |
107 | a8083063 | Iustin Pop | """Returns the combined stdout and stderr for easier usage.
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108 | a8083063 | Iustin Pop |
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109 | a8083063 | Iustin Pop | """
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110 | a8083063 | Iustin Pop | return self.stdout + self.stderr |
111 | a8083063 | Iustin Pop | |
112 | a8083063 | Iustin Pop | output = property(_GetOutput, None, None, "Return full output") |
113 | a8083063 | Iustin Pop | |
114 | a8083063 | Iustin Pop | |
115 | 8797df43 | Iustin Pop | def RunCmd(cmd, env=None, output=None, cwd='/'): |
116 | a8083063 | Iustin Pop | """Execute a (shell) command.
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117 | a8083063 | Iustin Pop |
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118 | a8083063 | Iustin Pop | The command should not read from its standard input, as it will be
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119 | a8083063 | Iustin Pop | closed.
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120 | a8083063 | Iustin Pop |
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121 | e326d4e5 | Guido Trotter | @type cmd: string or list
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122 | 36117c2b | Iustin Pop | @param cmd: Command to run
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123 | 2557ff82 | Guido Trotter | @type env: dict
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124 | 58885d79 | Iustin Pop | @param env: Additional environment
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125 | 36117c2b | Iustin Pop | @type output: str
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126 | 58885d79 | Iustin Pop | @param output: if desired, the output of the command can be
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127 | 36117c2b | Iustin Pop | saved in a file instead of the RunResult instance; this
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128 | 36117c2b | Iustin Pop | parameter denotes the file name (if not None)
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129 | 8797df43 | Iustin Pop | @type cwd: string
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130 | 8797df43 | Iustin Pop | @param cwd: if specified, will be used as the working
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131 | 8797df43 | Iustin Pop | directory for the command; the default will be /
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132 | 36117c2b | Iustin Pop | @rtype: L{RunResult}
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133 | 58885d79 | Iustin Pop | @return: RunResult instance
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134 | 58885d79 | Iustin Pop | @raise erors.ProgrammerError: if we call this when forks are disabled
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135 | a8083063 | Iustin Pop |
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136 | a8083063 | Iustin Pop | """
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137 | b74159ee | Iustin Pop | if no_fork:
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138 | b74159ee | Iustin Pop | raise errors.ProgrammerError("utils.RunCmd() called with fork() disabled") |
139 | b74159ee | Iustin Pop | |
140 | a8083063 | Iustin Pop | if isinstance(cmd, list): |
141 | a8083063 | Iustin Pop | cmd = [str(val) for val in cmd] |
142 | 113b55aa | Iustin Pop | strcmd = " ".join(cmd)
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143 | 113b55aa | Iustin Pop | shell = False
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144 | 113b55aa | Iustin Pop | else:
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145 | 113b55aa | Iustin Pop | strcmd = cmd |
146 | 113b55aa | Iustin Pop | shell = True
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147 | bb698c1f | Iustin Pop | logging.debug("RunCmd '%s'", strcmd)
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148 | 2557ff82 | Guido Trotter | |
149 | 2557ff82 | Guido Trotter | cmd_env = os.environ.copy() |
150 | 2557ff82 | Guido Trotter | cmd_env["LC_ALL"] = "C" |
151 | 2557ff82 | Guido Trotter | if env is not None: |
152 | 2557ff82 | Guido Trotter | cmd_env.update(env) |
153 | 2557ff82 | Guido Trotter | |
154 | 36117c2b | Iustin Pop | if output is None: |
155 | 8797df43 | Iustin Pop | out, err, status = _RunCmdPipe(cmd, cmd_env, shell, cwd) |
156 | 36117c2b | Iustin Pop | else:
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157 | 8797df43 | Iustin Pop | status = _RunCmdFile(cmd, cmd_env, shell, output, cwd) |
158 | 36117c2b | Iustin Pop | out = err = ""
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159 | 36117c2b | Iustin Pop | |
160 | 36117c2b | Iustin Pop | if status >= 0: |
161 | 36117c2b | Iustin Pop | exitcode = status |
162 | 36117c2b | Iustin Pop | signal_ = None
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163 | 36117c2b | Iustin Pop | else:
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164 | 36117c2b | Iustin Pop | exitcode = None
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165 | 36117c2b | Iustin Pop | signal_ = -status |
166 | 36117c2b | Iustin Pop | |
167 | 36117c2b | Iustin Pop | return RunResult(exitcode, signal_, out, err, strcmd)
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168 | 36117c2b | Iustin Pop | |
169 | ae59efea | Michael Hanselmann | |
170 | 8797df43 | Iustin Pop | def _RunCmdPipe(cmd, env, via_shell, cwd): |
171 | 36117c2b | Iustin Pop | """Run a command and return its output.
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172 | 36117c2b | Iustin Pop |
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173 | 36117c2b | Iustin Pop | @type cmd: string or list
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174 | 36117c2b | Iustin Pop | @param cmd: Command to run
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175 | 36117c2b | Iustin Pop | @type env: dict
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176 | 36117c2b | Iustin Pop | @param env: The environment to use
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177 | 36117c2b | Iustin Pop | @type via_shell: bool
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178 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
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179 | 8797df43 | Iustin Pop | @type cwd: string
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180 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
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181 | 36117c2b | Iustin Pop | @rtype: tuple
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182 | 36117c2b | Iustin Pop | @return: (out, err, status)
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183 | 36117c2b | Iustin Pop |
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184 | 36117c2b | Iustin Pop | """
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185 | 9c233417 | Iustin Pop | poller = select.poll() |
186 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
187 | 113b55aa | Iustin Pop | stderr=subprocess.PIPE, |
188 | 113b55aa | Iustin Pop | stdout=subprocess.PIPE, |
189 | 113b55aa | Iustin Pop | stdin=subprocess.PIPE, |
190 | 8797df43 | Iustin Pop | close_fds=True, env=env,
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191 | 8797df43 | Iustin Pop | cwd=cwd) |
192 | 113b55aa | Iustin Pop | |
193 | 113b55aa | Iustin Pop | child.stdin.close() |
194 | 9c233417 | Iustin Pop | poller.register(child.stdout, select.POLLIN) |
195 | 9c233417 | Iustin Pop | poller.register(child.stderr, select.POLLIN) |
196 | 9c233417 | Iustin Pop | out = StringIO() |
197 | 9c233417 | Iustin Pop | err = StringIO() |
198 | 9c233417 | Iustin Pop | fdmap = { |
199 | 9c233417 | Iustin Pop | child.stdout.fileno(): (out, child.stdout), |
200 | 9c233417 | Iustin Pop | child.stderr.fileno(): (err, child.stderr), |
201 | 9c233417 | Iustin Pop | } |
202 | 9c233417 | Iustin Pop | for fd in fdmap: |
203 | 9c233417 | Iustin Pop | status = fcntl.fcntl(fd, fcntl.F_GETFL) |
204 | 9c233417 | Iustin Pop | fcntl.fcntl(fd, fcntl.F_SETFL, status | os.O_NONBLOCK) |
205 | 9c233417 | Iustin Pop | |
206 | 9c233417 | Iustin Pop | while fdmap:
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207 | bf988c29 | Guido Trotter | try:
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208 | bf988c29 | Guido Trotter | pollresult = poller.poll() |
209 | bf988c29 | Guido Trotter | except EnvironmentError, eerr: |
210 | bf988c29 | Guido Trotter | if eerr.errno == errno.EINTR:
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211 | bf988c29 | Guido Trotter | continue
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212 | bf988c29 | Guido Trotter | raise
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213 | bf988c29 | Guido Trotter | except select.error, serr:
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214 | bf988c29 | Guido Trotter | if serr[0] == errno.EINTR: |
215 | bf988c29 | Guido Trotter | continue
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216 | bf988c29 | Guido Trotter | raise
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217 | bf988c29 | Guido Trotter | |
218 | bf988c29 | Guido Trotter | for fd, event in pollresult: |
219 | 9c233417 | Iustin Pop | if event & select.POLLIN or event & select.POLLPRI: |
220 | 9c233417 | Iustin Pop | data = fdmap[fd][1].read()
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221 | 9c233417 | Iustin Pop | # no data from read signifies EOF (the same as POLLHUP)
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222 | 9c233417 | Iustin Pop | if not data: |
223 | 9c233417 | Iustin Pop | poller.unregister(fd) |
224 | 9c233417 | Iustin Pop | del fdmap[fd]
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225 | 9c233417 | Iustin Pop | continue
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226 | 9c233417 | Iustin Pop | fdmap[fd][0].write(data)
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227 | 9c233417 | Iustin Pop | if (event & select.POLLNVAL or event & select.POLLHUP or |
228 | 9c233417 | Iustin Pop | event & select.POLLERR): |
229 | 9c233417 | Iustin Pop | poller.unregister(fd) |
230 | 9c233417 | Iustin Pop | del fdmap[fd]
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231 | 9c233417 | Iustin Pop | |
232 | 9c233417 | Iustin Pop | out = out.getvalue() |
233 | 9c233417 | Iustin Pop | err = err.getvalue() |
234 | a8083063 | Iustin Pop | |
235 | a8083063 | Iustin Pop | status = child.wait() |
236 | 36117c2b | Iustin Pop | return out, err, status
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237 | a8083063 | Iustin Pop | |
238 | 36117c2b | Iustin Pop | |
239 | 8797df43 | Iustin Pop | def _RunCmdFile(cmd, env, via_shell, output, cwd): |
240 | 36117c2b | Iustin Pop | """Run a command and save its output to a file.
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241 | 36117c2b | Iustin Pop |
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242 | 36117c2b | Iustin Pop | @type cmd: string or list
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243 | 36117c2b | Iustin Pop | @param cmd: Command to run
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244 | 36117c2b | Iustin Pop | @type env: dict
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245 | 36117c2b | Iustin Pop | @param env: The environment to use
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246 | 36117c2b | Iustin Pop | @type via_shell: bool
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247 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
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248 | 36117c2b | Iustin Pop | @type output: str
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249 | 36117c2b | Iustin Pop | @param output: the filename in which to save the output
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250 | 8797df43 | Iustin Pop | @type cwd: string
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251 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
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252 | 36117c2b | Iustin Pop | @rtype: int
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253 | 36117c2b | Iustin Pop | @return: the exit status
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254 | 36117c2b | Iustin Pop |
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255 | 36117c2b | Iustin Pop | """
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256 | 36117c2b | Iustin Pop | fh = open(output, "a") |
257 | 36117c2b | Iustin Pop | try:
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258 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
259 | 36117c2b | Iustin Pop | stderr=subprocess.STDOUT, |
260 | 36117c2b | Iustin Pop | stdout=fh, |
261 | 36117c2b | Iustin Pop | stdin=subprocess.PIPE, |
262 | 8797df43 | Iustin Pop | close_fds=True, env=env,
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263 | 8797df43 | Iustin Pop | cwd=cwd) |
264 | 36117c2b | Iustin Pop | |
265 | 36117c2b | Iustin Pop | child.stdin.close() |
266 | 36117c2b | Iustin Pop | status = child.wait() |
267 | 36117c2b | Iustin Pop | finally:
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268 | 36117c2b | Iustin Pop | fh.close() |
269 | 36117c2b | Iustin Pop | return status
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270 | a8083063 | Iustin Pop | |
271 | a8083063 | Iustin Pop | |
272 | a8083063 | Iustin Pop | def RemoveFile(filename): |
273 | a8083063 | Iustin Pop | """Remove a file ignoring some errors.
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274 | a8083063 | Iustin Pop |
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275 | a8083063 | Iustin Pop | Remove a file, ignoring non-existing ones or directories. Other
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276 | a8083063 | Iustin Pop | errors are passed.
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277 | a8083063 | Iustin Pop |
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278 | 58885d79 | Iustin Pop | @type filename: str
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279 | 58885d79 | Iustin Pop | @param filename: the file to be removed
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280 | 58885d79 | Iustin Pop |
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281 | a8083063 | Iustin Pop | """
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282 | a8083063 | Iustin Pop | try:
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283 | a8083063 | Iustin Pop | os.unlink(filename) |
284 | a8083063 | Iustin Pop | except OSError, err: |
285 | 4ca1b175 | Alexander Schreiber | if err.errno not in (errno.ENOENT, errno.EISDIR): |
286 | a8083063 | Iustin Pop | raise
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287 | a8083063 | Iustin Pop | |
288 | a8083063 | Iustin Pop | |
289 | 6e797216 | Michael Hanselmann | def RenameFile(old, new, mkdir=False, mkdir_mode=0750): |
290 | 6e797216 | Michael Hanselmann | """Renames a file.
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291 | 6e797216 | Michael Hanselmann |
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292 | 6e797216 | Michael Hanselmann | @type old: string
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293 | 6e797216 | Michael Hanselmann | @param old: Original path
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294 | 6e797216 | Michael Hanselmann | @type new: string
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295 | 6e797216 | Michael Hanselmann | @param new: New path
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296 | 6e797216 | Michael Hanselmann | @type mkdir: bool
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297 | 6e797216 | Michael Hanselmann | @param mkdir: Whether to create target directory if it doesn't exist
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298 | 6e797216 | Michael Hanselmann | @type mkdir_mode: int
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299 | 6e797216 | Michael Hanselmann | @param mkdir_mode: Mode for newly created directories
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300 | 6e797216 | Michael Hanselmann |
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301 | 6e797216 | Michael Hanselmann | """
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302 | 6e797216 | Michael Hanselmann | try:
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303 | 6e797216 | Michael Hanselmann | return os.rename(old, new)
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304 | 6e797216 | Michael Hanselmann | except OSError, err: |
305 | 6e797216 | Michael Hanselmann | # In at least one use case of this function, the job queue, directory
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306 | 6e797216 | Michael Hanselmann | # creation is very rare. Checking for the directory before renaming is not
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307 | 6e797216 | Michael Hanselmann | # as efficient.
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308 | 6e797216 | Michael Hanselmann | if mkdir and err.errno == errno.ENOENT: |
309 | 6e797216 | Michael Hanselmann | # Create directory and try again
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310 | 6e797216 | Michael Hanselmann | os.makedirs(os.path.dirname(new), mkdir_mode) |
311 | 6e797216 | Michael Hanselmann | return os.rename(old, new)
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312 | 6e797216 | Michael Hanselmann | raise
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313 | 6e797216 | Michael Hanselmann | |
314 | 6e797216 | Michael Hanselmann | |
315 | a8083063 | Iustin Pop | def _FingerprintFile(filename): |
316 | a8083063 | Iustin Pop | """Compute the fingerprint of a file.
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317 | a8083063 | Iustin Pop |
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318 | a8083063 | Iustin Pop | If the file does not exist, a None will be returned
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319 | a8083063 | Iustin Pop | instead.
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320 | a8083063 | Iustin Pop |
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321 | 58885d79 | Iustin Pop | @type filename: str
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322 | 58885d79 | Iustin Pop | @param filename: the filename to checksum
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323 | 58885d79 | Iustin Pop | @rtype: str
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324 | 58885d79 | Iustin Pop | @return: the hex digest of the sha checksum of the contents
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325 | 58885d79 | Iustin Pop | of the file
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326 | a8083063 | Iustin Pop |
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327 | a8083063 | Iustin Pop | """
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328 | a8083063 | Iustin Pop | if not (os.path.exists(filename) and os.path.isfile(filename)): |
329 | a8083063 | Iustin Pop | return None |
330 | a8083063 | Iustin Pop | |
331 | a8083063 | Iustin Pop | f = open(filename)
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332 | a8083063 | Iustin Pop | |
333 | a8083063 | Iustin Pop | fp = sha.sha() |
334 | a8083063 | Iustin Pop | while True: |
335 | a8083063 | Iustin Pop | data = f.read(4096)
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336 | a8083063 | Iustin Pop | if not data: |
337 | a8083063 | Iustin Pop | break
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338 | a8083063 | Iustin Pop | |
339 | a8083063 | Iustin Pop | fp.update(data) |
340 | a8083063 | Iustin Pop | |
341 | a8083063 | Iustin Pop | return fp.hexdigest()
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342 | a8083063 | Iustin Pop | |
343 | a8083063 | Iustin Pop | |
344 | a8083063 | Iustin Pop | def FingerprintFiles(files): |
345 | a8083063 | Iustin Pop | """Compute fingerprints for a list of files.
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346 | a8083063 | Iustin Pop |
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347 | 58885d79 | Iustin Pop | @type files: list
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348 | 58885d79 | Iustin Pop | @param files: the list of filename to fingerprint
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349 | 58885d79 | Iustin Pop | @rtype: dict
|
350 | 58885d79 | Iustin Pop | @return: a dictionary filename: fingerprint, holding only
|
351 | 58885d79 | Iustin Pop | existing files
|
352 | a8083063 | Iustin Pop |
|
353 | a8083063 | Iustin Pop | """
|
354 | a8083063 | Iustin Pop | ret = {} |
355 | a8083063 | Iustin Pop | |
356 | a8083063 | Iustin Pop | for filename in files: |
357 | a8083063 | Iustin Pop | cksum = _FingerprintFile(filename) |
358 | a8083063 | Iustin Pop | if cksum:
|
359 | a8083063 | Iustin Pop | ret[filename] = cksum |
360 | a8083063 | Iustin Pop | |
361 | a8083063 | Iustin Pop | return ret
|
362 | a8083063 | Iustin Pop | |
363 | a8083063 | Iustin Pop | |
364 | a8083063 | Iustin Pop | def CheckDict(target, template, logname=None): |
365 | a8083063 | Iustin Pop | """Ensure a dictionary has a required set of keys.
|
366 | a8083063 | Iustin Pop |
|
367 | 58885d79 | Iustin Pop | For the given dictionaries I{target} and I{template}, ensure
|
368 | 58885d79 | Iustin Pop | I{target} has all the keys from I{template}. Missing keys are added
|
369 | 58885d79 | Iustin Pop | with values from template.
|
370 | a8083063 | Iustin Pop |
|
371 | 58885d79 | Iustin Pop | @type target: dict
|
372 | 58885d79 | Iustin Pop | @param target: the dictionary to update
|
373 | 58885d79 | Iustin Pop | @type template: dict
|
374 | 58885d79 | Iustin Pop | @param template: the dictionary holding the default values
|
375 | 58885d79 | Iustin Pop | @type logname: str or None
|
376 | 58885d79 | Iustin Pop | @param logname: if not None, causes the missing keys to be
|
377 | 58885d79 | Iustin Pop | logged with this name
|
378 | a8083063 | Iustin Pop |
|
379 | a8083063 | Iustin Pop | """
|
380 | a8083063 | Iustin Pop | missing = [] |
381 | a8083063 | Iustin Pop | for k in template: |
382 | a8083063 | Iustin Pop | if k not in target: |
383 | a8083063 | Iustin Pop | missing.append(k) |
384 | a8083063 | Iustin Pop | target[k] = template[k] |
385 | a8083063 | Iustin Pop | |
386 | a8083063 | Iustin Pop | if missing and logname: |
387 | bb698c1f | Iustin Pop | logging.warning('%s missing keys %s', logname, ', '.join(missing)) |
388 | a8083063 | Iustin Pop | |
389 | a8083063 | Iustin Pop | |
390 | a5728081 | Guido Trotter | def ForceDictType(target, key_types, allowed_values=None): |
391 | a5728081 | Guido Trotter | """Force the values of a dict to have certain types.
|
392 | a5728081 | Guido Trotter |
|
393 | a5728081 | Guido Trotter | @type target: dict
|
394 | a5728081 | Guido Trotter | @param target: the dict to update
|
395 | a5728081 | Guido Trotter | @type key_types: dict
|
396 | a5728081 | Guido Trotter | @param key_types: dict mapping target dict keys to types
|
397 | a5728081 | Guido Trotter | in constants.ENFORCEABLE_TYPES
|
398 | a5728081 | Guido Trotter | @type allowed_values: list
|
399 | a5728081 | Guido Trotter | @keyword allowed_values: list of specially allowed values
|
400 | a5728081 | Guido Trotter |
|
401 | a5728081 | Guido Trotter | """
|
402 | a5728081 | Guido Trotter | if allowed_values is None: |
403 | a5728081 | Guido Trotter | allowed_values = [] |
404 | a5728081 | Guido Trotter | |
405 | a5728081 | Guido Trotter | for key in target: |
406 | a5728081 | Guido Trotter | if key not in key_types: |
407 | a5728081 | Guido Trotter | msg = "Unknown key '%s'" % key
|
408 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
409 | a5728081 | Guido Trotter | |
410 | a5728081 | Guido Trotter | if target[key] in allowed_values: |
411 | a5728081 | Guido Trotter | continue
|
412 | a5728081 | Guido Trotter | |
413 | a5728081 | Guido Trotter | type = key_types[key] |
414 | a5728081 | Guido Trotter | if type not in constants.ENFORCEABLE_TYPES: |
415 | a5728081 | Guido Trotter | msg = "'%s' has non-enforceable type %s" % (key, type) |
416 | a5728081 | Guido Trotter | raise errors.ProgrammerError(msg)
|
417 | a5728081 | Guido Trotter | |
418 | a5728081 | Guido Trotter | if type == constants.VTYPE_STRING:
|
419 | a5728081 | Guido Trotter | if not isinstance(target[key], basestring): |
420 | a5728081 | Guido Trotter | if isinstance(target[key], bool) and not target[key]: |
421 | a5728081 | Guido Trotter | target[key] = ''
|
422 | a5728081 | Guido Trotter | else:
|
423 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid string" % (key, target[key])
|
424 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
425 | a5728081 | Guido Trotter | elif type == constants.VTYPE_BOOL:
|
426 | a5728081 | Guido Trotter | if isinstance(target[key], basestring) and target[key]: |
427 | a5728081 | Guido Trotter | if target[key].lower() == constants.VALUE_FALSE:
|
428 | a5728081 | Guido Trotter | target[key] = False
|
429 | a5728081 | Guido Trotter | elif target[key].lower() == constants.VALUE_TRUE:
|
430 | a5728081 | Guido Trotter | target[key] = True
|
431 | a5728081 | Guido Trotter | else:
|
432 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid boolean" % (key, target[key])
|
433 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
434 | a5728081 | Guido Trotter | elif target[key]:
|
435 | a5728081 | Guido Trotter | target[key] = True
|
436 | a5728081 | Guido Trotter | else:
|
437 | a5728081 | Guido Trotter | target[key] = False
|
438 | a5728081 | Guido Trotter | elif type == constants.VTYPE_SIZE:
|
439 | a5728081 | Guido Trotter | try:
|
440 | a5728081 | Guido Trotter | target[key] = ParseUnit(target[key]) |
441 | a5728081 | Guido Trotter | except errors.UnitParseError, err:
|
442 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid size. error: %s" % \
|
443 | a5728081 | Guido Trotter | (key, target[key], err) |
444 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
445 | a5728081 | Guido Trotter | elif type == constants.VTYPE_INT:
|
446 | a5728081 | Guido Trotter | try:
|
447 | a5728081 | Guido Trotter | target[key] = int(target[key])
|
448 | a5728081 | Guido Trotter | except (ValueError, TypeError): |
449 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid integer" % (key, target[key])
|
450 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
451 | a5728081 | Guido Trotter | |
452 | a5728081 | Guido Trotter | |
453 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
454 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
|
455 | a8083063 | Iustin Pop |
|
456 | 44bf25ff | Iustin Pop | @note: zombie status is not handled, so zombie processes
|
457 | 44bf25ff | Iustin Pop | will be returned as alive
|
458 | 58885d79 | Iustin Pop | @type pid: int
|
459 | 58885d79 | Iustin Pop | @param pid: the process ID to check
|
460 | 58885d79 | Iustin Pop | @rtype: boolean
|
461 | 58885d79 | Iustin Pop | @return: True if the process exists
|
462 | a8083063 | Iustin Pop |
|
463 | a8083063 | Iustin Pop | """
|
464 | d9f311d7 | Iustin Pop | if pid <= 0: |
465 | d9f311d7 | Iustin Pop | return False |
466 | d9f311d7 | Iustin Pop | |
467 | a8083063 | Iustin Pop | try:
|
468 | 44bf25ff | Iustin Pop | os.stat("/proc/%d/status" % pid)
|
469 | 44bf25ff | Iustin Pop | return True |
470 | 44bf25ff | Iustin Pop | except EnvironmentError, err: |
471 | 4ca1b175 | Alexander Schreiber | if err.errno in (errno.ENOENT, errno.ENOTDIR): |
472 | a8083063 | Iustin Pop | return False |
473 | 44bf25ff | Iustin Pop | raise
|
474 | a8083063 | Iustin Pop | |
475 | a8083063 | Iustin Pop | |
476 | d9f311d7 | Iustin Pop | def ReadPidFile(pidfile): |
477 | 58885d79 | Iustin Pop | """Read a pid from a file.
|
478 | fee80e90 | Guido Trotter |
|
479 | 58885d79 | Iustin Pop | @type pidfile: string
|
480 | 58885d79 | Iustin Pop | @param pidfile: path to the file containing the pid
|
481 | 58885d79 | Iustin Pop | @rtype: int
|
482 | 1de62f37 | Guido Trotter | @return: The process id, if the file exists and contains a valid PID,
|
483 | d9f311d7 | Iustin Pop | otherwise 0
|
484 | fee80e90 | Guido Trotter |
|
485 | fee80e90 | Guido Trotter | """
|
486 | fee80e90 | Guido Trotter | try:
|
487 | fee80e90 | Guido Trotter | pf = open(pidfile, 'r') |
488 | d9f311d7 | Iustin Pop | except EnvironmentError, err: |
489 | d9f311d7 | Iustin Pop | if err.errno != errno.ENOENT:
|
490 | d9f311d7 | Iustin Pop | logging.exception("Can't read pid file?!")
|
491 | d9f311d7 | Iustin Pop | return 0 |
492 | fee80e90 | Guido Trotter | |
493 | fee80e90 | Guido Trotter | try:
|
494 | fee80e90 | Guido Trotter | pid = int(pf.read())
|
495 | d9f311d7 | Iustin Pop | except ValueError, err: |
496 | 8161a646 | Iustin Pop | logging.info("Can't parse pid file contents", exc_info=True) |
497 | d9f311d7 | Iustin Pop | return 0 |
498 | fee80e90 | Guido Trotter | |
499 | d9f311d7 | Iustin Pop | return pid
|
500 | fee80e90 | Guido Trotter | |
501 | fee80e90 | Guido Trotter | |
502 | a8083063 | Iustin Pop | def MatchNameComponent(key, name_list): |
503 | a8083063 | Iustin Pop | """Try to match a name against a list.
|
504 | a8083063 | Iustin Pop |
|
505 | a8083063 | Iustin Pop | This function will try to match a name like test1 against a list
|
506 | 58885d79 | Iustin Pop | like C{['test1.example.com', 'test2.example.com', ...]}. Against
|
507 | 58885d79 | Iustin Pop | this list, I{'test1'} as well as I{'test1.example'} will match, but
|
508 | 58885d79 | Iustin Pop | not I{'test1.ex'}. A multiple match will be considered as no match
|
509 | 58885d79 | Iustin Pop | at all (e.g. I{'test1'} against C{['test1.example.com',
|
510 | 58885d79 | Iustin Pop | 'test1.example.org']}).
|
511 | a8083063 | Iustin Pop |
|
512 | 58885d79 | Iustin Pop | @type key: str
|
513 | 58885d79 | Iustin Pop | @param key: the name to be searched
|
514 | 58885d79 | Iustin Pop | @type name_list: list
|
515 | 58885d79 | Iustin Pop | @param name_list: the list of strings against which to search the key
|
516 | a8083063 | Iustin Pop |
|
517 | 58885d79 | Iustin Pop | @rtype: None or str
|
518 | 58885d79 | Iustin Pop | @return: None if there is no match I{or} if there are multiple matches,
|
519 | 58885d79 | Iustin Pop | otherwise the element from the list which matches
|
520 | a8083063 | Iustin Pop |
|
521 | a8083063 | Iustin Pop | """
|
522 | a8083063 | Iustin Pop | mo = re.compile("^%s(\..*)?$" % re.escape(key))
|
523 | a8083063 | Iustin Pop | names_filtered = [name for name in name_list if mo.match(name) is not None] |
524 | a8083063 | Iustin Pop | if len(names_filtered) != 1: |
525 | a8083063 | Iustin Pop | return None |
526 | a8083063 | Iustin Pop | return names_filtered[0] |
527 | a8083063 | Iustin Pop | |
528 | a8083063 | Iustin Pop | |
529 | bcf043c9 | Iustin Pop | class HostInfo: |
530 | 89e1fc26 | Iustin Pop | """Class implementing resolver and hostname functionality
|
531 | bcf043c9 | Iustin Pop |
|
532 | bcf043c9 | Iustin Pop | """
|
533 | 89e1fc26 | Iustin Pop | def __init__(self, name=None): |
534 | bcf043c9 | Iustin Pop | """Initialize the host name object.
|
535 | bcf043c9 | Iustin Pop |
|
536 | 89e1fc26 | Iustin Pop | If the name argument is not passed, it will use this system's
|
537 | 89e1fc26 | Iustin Pop | name.
|
538 | bcf043c9 | Iustin Pop |
|
539 | bcf043c9 | Iustin Pop | """
|
540 | 89e1fc26 | Iustin Pop | if name is None: |
541 | 89e1fc26 | Iustin Pop | name = self.SysName()
|
542 | 89e1fc26 | Iustin Pop | |
543 | 89e1fc26 | Iustin Pop | self.query = name
|
544 | 89e1fc26 | Iustin Pop | self.name, self.aliases, self.ipaddrs = self.LookupHostname(name) |
545 | bcf043c9 | Iustin Pop | self.ip = self.ipaddrs[0] |
546 | bcf043c9 | Iustin Pop | |
547 | c8a0948f | Michael Hanselmann | def ShortName(self): |
548 | c8a0948f | Michael Hanselmann | """Returns the hostname without domain.
|
549 | c8a0948f | Michael Hanselmann |
|
550 | c8a0948f | Michael Hanselmann | """
|
551 | c8a0948f | Michael Hanselmann | return self.name.split('.')[0] |
552 | c8a0948f | Michael Hanselmann | |
553 | 89e1fc26 | Iustin Pop | @staticmethod
|
554 | 89e1fc26 | Iustin Pop | def SysName(): |
555 | 89e1fc26 | Iustin Pop | """Return the current system's name.
|
556 | bcf043c9 | Iustin Pop |
|
557 | 58885d79 | Iustin Pop | This is simply a wrapper over C{socket.gethostname()}.
|
558 | a8083063 | Iustin Pop |
|
559 | 89e1fc26 | Iustin Pop | """
|
560 | 89e1fc26 | Iustin Pop | return socket.gethostname()
|
561 | a8083063 | Iustin Pop | |
562 | 89e1fc26 | Iustin Pop | @staticmethod
|
563 | 89e1fc26 | Iustin Pop | def LookupHostname(hostname): |
564 | 89e1fc26 | Iustin Pop | """Look up hostname
|
565 | a8083063 | Iustin Pop |
|
566 | 58885d79 | Iustin Pop | @type hostname: str
|
567 | 58885d79 | Iustin Pop | @param hostname: hostname to look up
|
568 | 89e1fc26 | Iustin Pop |
|
569 | 58885d79 | Iustin Pop | @rtype: tuple
|
570 | 58885d79 | Iustin Pop | @return: a tuple (name, aliases, ipaddrs) as returned by
|
571 | 58885d79 | Iustin Pop | C{socket.gethostbyname_ex}
|
572 | 58885d79 | Iustin Pop | @raise errors.ResolverError: in case of errors in resolving
|
573 | 89e1fc26 | Iustin Pop |
|
574 | 89e1fc26 | Iustin Pop | """
|
575 | 89e1fc26 | Iustin Pop | try:
|
576 | 89e1fc26 | Iustin Pop | result = socket.gethostbyname_ex(hostname) |
577 | 89e1fc26 | Iustin Pop | except socket.gaierror, err:
|
578 | 89e1fc26 | Iustin Pop | # hostname not found in DNS
|
579 | 89e1fc26 | Iustin Pop | raise errors.ResolverError(hostname, err.args[0], err.args[1]) |
580 | a8083063 | Iustin Pop | |
581 | 89e1fc26 | Iustin Pop | return result
|
582 | a8083063 | Iustin Pop | |
583 | a8083063 | Iustin Pop | |
584 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
585 | a8083063 | Iustin Pop | """List volume groups and their size
|
586 | a8083063 | Iustin Pop |
|
587 | 58885d79 | Iustin Pop | @rtype: dict
|
588 | 58885d79 | Iustin Pop | @return:
|
589 | 58885d79 | Iustin Pop | Dictionary with keys volume name and values
|
590 | 58885d79 | Iustin Pop | the size of the volume
|
591 | a8083063 | Iustin Pop |
|
592 | a8083063 | Iustin Pop | """
|
593 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
594 | a8083063 | Iustin Pop | result = RunCmd(command) |
595 | a8083063 | Iustin Pop | retval = {} |
596 | a8083063 | Iustin Pop | if result.failed:
|
597 | a8083063 | Iustin Pop | return retval
|
598 | a8083063 | Iustin Pop | |
599 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
600 | a8083063 | Iustin Pop | try:
|
601 | a8083063 | Iustin Pop | name, size = line.split() |
602 | a8083063 | Iustin Pop | size = int(float(size)) |
603 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
604 | bb698c1f | Iustin Pop | logging.error("Invalid output from vgs (%s): %s", err, line)
|
605 | a8083063 | Iustin Pop | continue
|
606 | a8083063 | Iustin Pop | |
607 | a8083063 | Iustin Pop | retval[name] = size |
608 | a8083063 | Iustin Pop | |
609 | a8083063 | Iustin Pop | return retval
|
610 | a8083063 | Iustin Pop | |
611 | a8083063 | Iustin Pop | |
612 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
613 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
614 | a8083063 | Iustin Pop |
|
615 | 58885d79 | Iustin Pop | @type bridge: str
|
616 | 58885d79 | Iustin Pop | @param bridge: the bridge name to check
|
617 | 58885d79 | Iustin Pop | @rtype: boolean
|
618 | 58885d79 | Iustin Pop | @return: True if it does
|
619 | a8083063 | Iustin Pop |
|
620 | a8083063 | Iustin Pop | """
|
621 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
622 | a8083063 | Iustin Pop | |
623 | a8083063 | Iustin Pop | |
624 | a8083063 | Iustin Pop | def NiceSort(name_list): |
625 | a8083063 | Iustin Pop | """Sort a list of strings based on digit and non-digit groupings.
|
626 | a8083063 | Iustin Pop |
|
627 | 58885d79 | Iustin Pop | Given a list of names C{['a1', 'a10', 'a11', 'a2']} this function
|
628 | 58885d79 | Iustin Pop | will sort the list in the logical order C{['a1', 'a2', 'a10',
|
629 | 58885d79 | Iustin Pop | 'a11']}.
|
630 | a8083063 | Iustin Pop |
|
631 | a8083063 | Iustin Pop | The sort algorithm breaks each name in groups of either only-digits
|
632 | a8083063 | Iustin Pop | or no-digits. Only the first eight such groups are considered, and
|
633 | a8083063 | Iustin Pop | after that we just use what's left of the string.
|
634 | a8083063 | Iustin Pop |
|
635 | 58885d79 | Iustin Pop | @type name_list: list
|
636 | 58885d79 | Iustin Pop | @param name_list: the names to be sorted
|
637 | 58885d79 | Iustin Pop | @rtype: list
|
638 | 58885d79 | Iustin Pop | @return: a copy of the name list sorted with our algorithm
|
639 | a8083063 | Iustin Pop |
|
640 | a8083063 | Iustin Pop | """
|
641 | a8083063 | Iustin Pop | _SORTER_BASE = "(\D+|\d+)"
|
642 | a8083063 | Iustin Pop | _SORTER_FULL = "^%s%s?%s?%s?%s?%s?%s?%s?.*$" % (_SORTER_BASE, _SORTER_BASE,
|
643 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
644 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
645 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE) |
646 | a8083063 | Iustin Pop | _SORTER_RE = re.compile(_SORTER_FULL) |
647 | a8083063 | Iustin Pop | _SORTER_NODIGIT = re.compile("^\D*$")
|
648 | a8083063 | Iustin Pop | def _TryInt(val): |
649 | a8083063 | Iustin Pop | """Attempts to convert a variable to integer."""
|
650 | a8083063 | Iustin Pop | if val is None or _SORTER_NODIGIT.match(val): |
651 | a8083063 | Iustin Pop | return val
|
652 | a8083063 | Iustin Pop | rval = int(val)
|
653 | a8083063 | Iustin Pop | return rval
|
654 | a8083063 | Iustin Pop | |
655 | a8083063 | Iustin Pop | to_sort = [([_TryInt(grp) for grp in _SORTER_RE.match(name).groups()], name) |
656 | a8083063 | Iustin Pop | for name in name_list] |
657 | a8083063 | Iustin Pop | to_sort.sort() |
658 | a8083063 | Iustin Pop | return [tup[1] for tup in to_sort] |
659 | a8083063 | Iustin Pop | |
660 | a8083063 | Iustin Pop | |
661 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
662 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
663 | a8083063 | Iustin Pop |
|
664 | 58885d79 | Iustin Pop | This function tries to apply function I{fn} to I{val}. If no
|
665 | 58885d79 | Iustin Pop | C{ValueError} or C{TypeError} exceptions are raised, it will return
|
666 | 58885d79 | Iustin Pop | the result, else it will return the original value. Any other
|
667 | 58885d79 | Iustin Pop | exceptions are propagated to the caller.
|
668 | 58885d79 | Iustin Pop |
|
669 | 58885d79 | Iustin Pop | @type fn: callable
|
670 | 58885d79 | Iustin Pop | @param fn: function to apply to the value
|
671 | 58885d79 | Iustin Pop | @param val: the value to be converted
|
672 | 58885d79 | Iustin Pop | @return: The converted value if the conversion was successful,
|
673 | 58885d79 | Iustin Pop | otherwise the original value.
|
674 | a8083063 | Iustin Pop |
|
675 | a8083063 | Iustin Pop | """
|
676 | a8083063 | Iustin Pop | try:
|
677 | a8083063 | Iustin Pop | nv = fn(val) |
678 | a8083063 | Iustin Pop | except (ValueError, TypeError), err: |
679 | a8083063 | Iustin Pop | nv = val |
680 | a8083063 | Iustin Pop | return nv
|
681 | a8083063 | Iustin Pop | |
682 | a8083063 | Iustin Pop | |
683 | a8083063 | Iustin Pop | def IsValidIP(ip): |
684 | 58885d79 | Iustin Pop | """Verifies the syntax of an IPv4 address.
|
685 | a8083063 | Iustin Pop |
|
686 | 58885d79 | Iustin Pop | This function checks if the IPv4 address passes is valid or not based
|
687 | 58885d79 | Iustin Pop | on syntax (not IP range, class calculations, etc.).
|
688 | 58885d79 | Iustin Pop |
|
689 | 58885d79 | Iustin Pop | @type ip: str
|
690 | 58885d79 | Iustin Pop | @param ip: the address to be checked
|
691 | 58885d79 | Iustin Pop | @rtype: a regular expression match object
|
692 | 58885d79 | Iustin Pop | @return: a regular epression match object, or None if the
|
693 | 58885d79 | Iustin Pop | address is not valid
|
694 | a8083063 | Iustin Pop |
|
695 | a8083063 | Iustin Pop | """
|
696 | a8083063 | Iustin Pop | unit = "(0|[1-9]\d{0,2})"
|
697 | 58885d79 | Iustin Pop | #TODO: convert and return only boolean
|
698 | a8083063 | Iustin Pop | return re.match("^%s\.%s\.%s\.%s$" % (unit, unit, unit, unit), ip) |
699 | a8083063 | Iustin Pop | |
700 | a8083063 | Iustin Pop | |
701 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
702 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
703 | a8083063 | Iustin Pop |
|
704 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
705 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
706 | a8083063 | Iustin Pop | the actual command.
|
707 | a8083063 | Iustin Pop |
|
708 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
709 | a8083063 | Iustin Pop | side.
|
710 | a8083063 | Iustin Pop |
|
711 | 58885d79 | Iustin Pop | @type word: str
|
712 | 58885d79 | Iustin Pop | @param word: the word to check
|
713 | 58885d79 | Iustin Pop | @rtype: boolean
|
714 | 58885d79 | Iustin Pop | @return: True if the word is 'safe'
|
715 | 58885d79 | Iustin Pop |
|
716 | a8083063 | Iustin Pop | """
|
717 | a8083063 | Iustin Pop | return bool(re.match("^[-a-zA-Z0-9._+/:%@]+$", word)) |
718 | a8083063 | Iustin Pop | |
719 | a8083063 | Iustin Pop | |
720 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
721 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
722 | a8083063 | Iustin Pop |
|
723 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
724 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
725 | a8083063 | Iustin Pop | metacharaters). If everything is ok, it will return the result of
|
726 | a8083063 | Iustin Pop | template % args.
|
727 | a8083063 | Iustin Pop |
|
728 | 58885d79 | Iustin Pop | @type template: str
|
729 | 58885d79 | Iustin Pop | @param template: the string holding the template for the
|
730 | 58885d79 | Iustin Pop | string formatting
|
731 | 58885d79 | Iustin Pop | @rtype: str
|
732 | 58885d79 | Iustin Pop | @return: the expanded command line
|
733 | 58885d79 | Iustin Pop |
|
734 | a8083063 | Iustin Pop | """
|
735 | a8083063 | Iustin Pop | for word in args: |
736 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
737 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
738 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
739 | a8083063 | Iustin Pop | return template % args
|
740 | a8083063 | Iustin Pop | |
741 | a8083063 | Iustin Pop | |
742 | 9fbfbb7b | Iustin Pop | def FormatUnit(value, units): |
743 | a8083063 | Iustin Pop | """Formats an incoming number of MiB with the appropriate unit.
|
744 | a8083063 | Iustin Pop |
|
745 | 58885d79 | Iustin Pop | @type value: int
|
746 | 58885d79 | Iustin Pop | @param value: integer representing the value in MiB (1048576)
|
747 | 9fbfbb7b | Iustin Pop | @type units: char
|
748 | 9fbfbb7b | Iustin Pop | @param units: the type of formatting we should do:
|
749 | 9fbfbb7b | Iustin Pop | - 'h' for automatic scaling
|
750 | 9fbfbb7b | Iustin Pop | - 'm' for MiBs
|
751 | 9fbfbb7b | Iustin Pop | - 'g' for GiBs
|
752 | 9fbfbb7b | Iustin Pop | - 't' for TiBs
|
753 | 58885d79 | Iustin Pop | @rtype: str
|
754 | 58885d79 | Iustin Pop | @return: the formatted value (with suffix)
|
755 | a8083063 | Iustin Pop |
|
756 | a8083063 | Iustin Pop | """
|
757 | 9fbfbb7b | Iustin Pop | if units not in ('m', 'g', 't', 'h'): |
758 | 9fbfbb7b | Iustin Pop | raise errors.ProgrammerError("Invalid unit specified '%s'" % str(units)) |
759 | a8083063 | Iustin Pop | |
760 | 9fbfbb7b | Iustin Pop | suffix = ''
|
761 | 9fbfbb7b | Iustin Pop | |
762 | 9fbfbb7b | Iustin Pop | if units == 'm' or (units == 'h' and value < 1024): |
763 | 9fbfbb7b | Iustin Pop | if units == 'h': |
764 | 9fbfbb7b | Iustin Pop | suffix = 'M'
|
765 | 9fbfbb7b | Iustin Pop | return "%d%s" % (round(value, 0), suffix) |
766 | 9fbfbb7b | Iustin Pop | |
767 | 9fbfbb7b | Iustin Pop | elif units == 'g' or (units == 'h' and value < (1024 * 1024)): |
768 | 9fbfbb7b | Iustin Pop | if units == 'h': |
769 | 9fbfbb7b | Iustin Pop | suffix = 'G'
|
770 | 9fbfbb7b | Iustin Pop | return "%0.1f%s" % (round(float(value) / 1024, 1), suffix) |
771 | a8083063 | Iustin Pop | |
772 | a8083063 | Iustin Pop | else:
|
773 | 9fbfbb7b | Iustin Pop | if units == 'h': |
774 | 9fbfbb7b | Iustin Pop | suffix = 'T'
|
775 | 9fbfbb7b | Iustin Pop | return "%0.1f%s" % (round(float(value) / 1024 / 1024, 1), suffix) |
776 | a8083063 | Iustin Pop | |
777 | a8083063 | Iustin Pop | |
778 | a8083063 | Iustin Pop | def ParseUnit(input_string): |
779 | a8083063 | Iustin Pop | """Tries to extract number and scale from the given string.
|
780 | a8083063 | Iustin Pop |
|
781 | 58885d79 | Iustin Pop | Input must be in the format C{NUMBER+ [DOT NUMBER+] SPACE*
|
782 | 58885d79 | Iustin Pop | [UNIT]}. If no unit is specified, it defaults to MiB. Return value
|
783 | 58885d79 | Iustin Pop | is always an int in MiB.
|
784 | a8083063 | Iustin Pop |
|
785 | a8083063 | Iustin Pop | """
|
786 | 9939547b | Iustin Pop | m = re.match('^([.\d]+)\s*([a-zA-Z]+)?$', str(input_string)) |
787 | a8083063 | Iustin Pop | if not m: |
788 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Invalid format") |
789 | a8083063 | Iustin Pop | |
790 | a8083063 | Iustin Pop | value = float(m.groups()[0]) |
791 | a8083063 | Iustin Pop | |
792 | a8083063 | Iustin Pop | unit = m.groups()[1]
|
793 | a8083063 | Iustin Pop | if unit:
|
794 | a8083063 | Iustin Pop | lcunit = unit.lower() |
795 | a8083063 | Iustin Pop | else:
|
796 | a8083063 | Iustin Pop | lcunit = 'm'
|
797 | a8083063 | Iustin Pop | |
798 | a8083063 | Iustin Pop | if lcunit in ('m', 'mb', 'mib'): |
799 | a8083063 | Iustin Pop | # Value already in MiB
|
800 | a8083063 | Iustin Pop | pass
|
801 | a8083063 | Iustin Pop | |
802 | a8083063 | Iustin Pop | elif lcunit in ('g', 'gb', 'gib'): |
803 | a8083063 | Iustin Pop | value *= 1024
|
804 | a8083063 | Iustin Pop | |
805 | a8083063 | Iustin Pop | elif lcunit in ('t', 'tb', 'tib'): |
806 | a8083063 | Iustin Pop | value *= 1024 * 1024 |
807 | a8083063 | Iustin Pop | |
808 | a8083063 | Iustin Pop | else:
|
809 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Unknown unit: %s" % unit) |
810 | a8083063 | Iustin Pop | |
811 | a8083063 | Iustin Pop | # Make sure we round up
|
812 | a8083063 | Iustin Pop | if int(value) < value: |
813 | a8083063 | Iustin Pop | value += 1
|
814 | a8083063 | Iustin Pop | |
815 | a8083063 | Iustin Pop | # Round up to the next multiple of 4
|
816 | a8083063 | Iustin Pop | value = int(value)
|
817 | a8083063 | Iustin Pop | if value % 4: |
818 | a8083063 | Iustin Pop | value += 4 - value % 4 |
819 | a8083063 | Iustin Pop | |
820 | a8083063 | Iustin Pop | return value
|
821 | a8083063 | Iustin Pop | |
822 | a8083063 | Iustin Pop | |
823 | a8083063 | Iustin Pop | def AddAuthorizedKey(file_name, key): |
824 | a8083063 | Iustin Pop | """Adds an SSH public key to an authorized_keys file.
|
825 | a8083063 | Iustin Pop |
|
826 | 58885d79 | Iustin Pop | @type file_name: str
|
827 | 58885d79 | Iustin Pop | @param file_name: path to authorized_keys file
|
828 | 58885d79 | Iustin Pop | @type key: str
|
829 | 58885d79 | Iustin Pop | @param key: string containing key
|
830 | 58885d79 | Iustin Pop |
|
831 | a8083063 | Iustin Pop | """
|
832 | a8083063 | Iustin Pop | key_fields = key.split() |
833 | a8083063 | Iustin Pop | |
834 | a8083063 | Iustin Pop | f = open(file_name, 'a+') |
835 | a8083063 | Iustin Pop | try:
|
836 | a8083063 | Iustin Pop | nl = True
|
837 | a8083063 | Iustin Pop | for line in f: |
838 | a8083063 | Iustin Pop | # Ignore whitespace changes
|
839 | a8083063 | Iustin Pop | if line.split() == key_fields:
|
840 | a8083063 | Iustin Pop | break
|
841 | a8083063 | Iustin Pop | nl = line.endswith('\n')
|
842 | a8083063 | Iustin Pop | else:
|
843 | a8083063 | Iustin Pop | if not nl: |
844 | a8083063 | Iustin Pop | f.write("\n")
|
845 | a8083063 | Iustin Pop | f.write(key.rstrip('\r\n'))
|
846 | a8083063 | Iustin Pop | f.write("\n")
|
847 | a8083063 | Iustin Pop | f.flush() |
848 | a8083063 | Iustin Pop | finally:
|
849 | a8083063 | Iustin Pop | f.close() |
850 | a8083063 | Iustin Pop | |
851 | a8083063 | Iustin Pop | |
852 | a8083063 | Iustin Pop | def RemoveAuthorizedKey(file_name, key): |
853 | a8083063 | Iustin Pop | """Removes an SSH public key from an authorized_keys file.
|
854 | a8083063 | Iustin Pop |
|
855 | 58885d79 | Iustin Pop | @type file_name: str
|
856 | 58885d79 | Iustin Pop | @param file_name: path to authorized_keys file
|
857 | 58885d79 | Iustin Pop | @type key: str
|
858 | 58885d79 | Iustin Pop | @param key: string containing key
|
859 | 58885d79 | Iustin Pop |
|
860 | a8083063 | Iustin Pop | """
|
861 | a8083063 | Iustin Pop | key_fields = key.split() |
862 | a8083063 | Iustin Pop | |
863 | a8083063 | Iustin Pop | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
864 | a8083063 | Iustin Pop | try:
|
865 | 59f82e3f | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
866 | a8083063 | Iustin Pop | try:
|
867 | 59f82e3f | Michael Hanselmann | f = open(file_name, 'r') |
868 | 59f82e3f | Michael Hanselmann | try:
|
869 | 59f82e3f | Michael Hanselmann | for line in f: |
870 | 59f82e3f | Michael Hanselmann | # Ignore whitespace changes while comparing lines
|
871 | 59f82e3f | Michael Hanselmann | if line.split() != key_fields:
|
872 | 59f82e3f | Michael Hanselmann | out.write(line) |
873 | 899d2a81 | Michael Hanselmann | |
874 | 899d2a81 | Michael Hanselmann | out.flush() |
875 | 899d2a81 | Michael Hanselmann | os.rename(tmpname, file_name) |
876 | 899d2a81 | Michael Hanselmann | finally:
|
877 | 899d2a81 | Michael Hanselmann | f.close() |
878 | 899d2a81 | Michael Hanselmann | finally:
|
879 | 899d2a81 | Michael Hanselmann | out.close() |
880 | 899d2a81 | Michael Hanselmann | except:
|
881 | 899d2a81 | Michael Hanselmann | RemoveFile(tmpname) |
882 | 899d2a81 | Michael Hanselmann | raise
|
883 | 899d2a81 | Michael Hanselmann | |
884 | 899d2a81 | Michael Hanselmann | |
885 | 9440aeab | Michael Hanselmann | def SetEtcHostsEntry(file_name, ip, hostname, aliases): |
886 | 9440aeab | Michael Hanselmann | """Sets the name of an IP address and hostname in /etc/hosts.
|
887 | 899d2a81 | Michael Hanselmann |
|
888 | 58885d79 | Iustin Pop | @type file_name: str
|
889 | 58885d79 | Iustin Pop | @param file_name: path to the file to modify (usually C{/etc/hosts})
|
890 | 58885d79 | Iustin Pop | @type ip: str
|
891 | 58885d79 | Iustin Pop | @param ip: the IP address
|
892 | 58885d79 | Iustin Pop | @type hostname: str
|
893 | 58885d79 | Iustin Pop | @param hostname: the hostname to be added
|
894 | 58885d79 | Iustin Pop | @type aliases: list
|
895 | 58885d79 | Iustin Pop | @param aliases: the list of aliases to add for the hostname
|
896 | 58885d79 | Iustin Pop |
|
897 | 899d2a81 | Michael Hanselmann | """
|
898 | 9b977740 | Guido Trotter | # FIXME: use WriteFile + fn rather than duplicating its efforts
|
899 | 7fbb1f65 | Michael Hanselmann | # Ensure aliases are unique
|
900 | 7fbb1f65 | Michael Hanselmann | aliases = UniqueSequence([hostname] + aliases)[1:]
|
901 | 7fbb1f65 | Michael Hanselmann | |
902 | 9440aeab | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
903 | 899d2a81 | Michael Hanselmann | try:
|
904 | 9440aeab | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
905 | 9440aeab | Michael Hanselmann | try:
|
906 | 9440aeab | Michael Hanselmann | f = open(file_name, 'r') |
907 | 9440aeab | Michael Hanselmann | try:
|
908 | 9440aeab | Michael Hanselmann | for line in f: |
909 | 9440aeab | Michael Hanselmann | fields = line.split() |
910 | 7e3dbb94 | Iustin Pop | if fields and not fields[0].startswith('#') and ip == fields[0]: |
911 | 9440aeab | Michael Hanselmann | continue
|
912 | 9440aeab | Michael Hanselmann | out.write(line) |
913 | 9440aeab | Michael Hanselmann | |
914 | 7e3dbb94 | Iustin Pop | out.write("%s\t%s" % (ip, hostname))
|
915 | 9440aeab | Michael Hanselmann | if aliases:
|
916 | 9440aeab | Michael Hanselmann | out.write(" %s" % ' '.join(aliases)) |
917 | 9440aeab | Michael Hanselmann | out.write('\n')
|
918 | 9440aeab | Michael Hanselmann | |
919 | 9440aeab | Michael Hanselmann | out.flush() |
920 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
921 | 9b977740 | Guido Trotter | os.chmod(tmpname, 0644)
|
922 | 9440aeab | Michael Hanselmann | os.rename(tmpname, file_name) |
923 | 9440aeab | Michael Hanselmann | finally:
|
924 | 9440aeab | Michael Hanselmann | f.close() |
925 | 9440aeab | Michael Hanselmann | finally:
|
926 | 9440aeab | Michael Hanselmann | out.close() |
927 | 9440aeab | Michael Hanselmann | except:
|
928 | 9440aeab | Michael Hanselmann | RemoveFile(tmpname) |
929 | 9440aeab | Michael Hanselmann | raise
|
930 | 899d2a81 | Michael Hanselmann | |
931 | 899d2a81 | Michael Hanselmann | |
932 | d9c02ca6 | Michael Hanselmann | def AddHostToEtcHosts(hostname): |
933 | d9c02ca6 | Michael Hanselmann | """Wrapper around SetEtcHostsEntry.
|
934 | d9c02ca6 | Michael Hanselmann |
|
935 | 58885d79 | Iustin Pop | @type hostname: str
|
936 | 58885d79 | Iustin Pop | @param hostname: a hostname that will be resolved and added to
|
937 | 58885d79 | Iustin Pop | L{constants.ETC_HOSTS}
|
938 | 58885d79 | Iustin Pop |
|
939 | d9c02ca6 | Michael Hanselmann | """
|
940 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
941 | d9c02ca6 | Michael Hanselmann | SetEtcHostsEntry(constants.ETC_HOSTS, hi.ip, hi.name, [hi.ShortName()]) |
942 | d9c02ca6 | Michael Hanselmann | |
943 | d9c02ca6 | Michael Hanselmann | |
944 | 899d2a81 | Michael Hanselmann | def RemoveEtcHostsEntry(file_name, hostname): |
945 | 3e1cdf9f | Michael Hanselmann | """Removes a hostname from /etc/hosts.
|
946 | 899d2a81 | Michael Hanselmann |
|
947 | 9440aeab | Michael Hanselmann | IP addresses without names are removed from the file.
|
948 | 58885d79 | Iustin Pop |
|
949 | 58885d79 | Iustin Pop | @type file_name: str
|
950 | 58885d79 | Iustin Pop | @param file_name: path to the file to modify (usually C{/etc/hosts})
|
951 | 58885d79 | Iustin Pop | @type hostname: str
|
952 | 58885d79 | Iustin Pop | @param hostname: the hostname to be removed
|
953 | 58885d79 | Iustin Pop |
|
954 | 899d2a81 | Michael Hanselmann | """
|
955 | 9b977740 | Guido Trotter | # FIXME: use WriteFile + fn rather than duplicating its efforts
|
956 | 899d2a81 | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
957 | 899d2a81 | Michael Hanselmann | try:
|
958 | 899d2a81 | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
959 | 899d2a81 | Michael Hanselmann | try:
|
960 | 899d2a81 | Michael Hanselmann | f = open(file_name, 'r') |
961 | 899d2a81 | Michael Hanselmann | try:
|
962 | 899d2a81 | Michael Hanselmann | for line in f: |
963 | 899d2a81 | Michael Hanselmann | fields = line.split() |
964 | 899d2a81 | Michael Hanselmann | if len(fields) > 1 and not fields[0].startswith('#'): |
965 | 899d2a81 | Michael Hanselmann | names = fields[1:]
|
966 | 899d2a81 | Michael Hanselmann | if hostname in names: |
967 | 899d2a81 | Michael Hanselmann | while hostname in names: |
968 | 899d2a81 | Michael Hanselmann | names.remove(hostname) |
969 | 899d2a81 | Michael Hanselmann | if names:
|
970 | 9440aeab | Michael Hanselmann | out.write("%s %s\n" % (fields[0], ' '.join(names))) |
971 | 899d2a81 | Michael Hanselmann | continue
|
972 | 899d2a81 | Michael Hanselmann | |
973 | 899d2a81 | Michael Hanselmann | out.write(line) |
974 | 59f82e3f | Michael Hanselmann | |
975 | 59f82e3f | Michael Hanselmann | out.flush() |
976 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
977 | 9b977740 | Guido Trotter | os.chmod(tmpname, 0644)
|
978 | 59f82e3f | Michael Hanselmann | os.rename(tmpname, file_name) |
979 | 59f82e3f | Michael Hanselmann | finally:
|
980 | 59f82e3f | Michael Hanselmann | f.close() |
981 | a8083063 | Iustin Pop | finally:
|
982 | 59f82e3f | Michael Hanselmann | out.close() |
983 | 59f82e3f | Michael Hanselmann | except:
|
984 | 59f82e3f | Michael Hanselmann | RemoveFile(tmpname) |
985 | 59f82e3f | Michael Hanselmann | raise
|
986 | a8083063 | Iustin Pop | |
987 | a8083063 | Iustin Pop | |
988 | d9c02ca6 | Michael Hanselmann | def RemoveHostFromEtcHosts(hostname): |
989 | d9c02ca6 | Michael Hanselmann | """Wrapper around RemoveEtcHostsEntry.
|
990 | d9c02ca6 | Michael Hanselmann |
|
991 | 58885d79 | Iustin Pop | @type hostname: str
|
992 | 58885d79 | Iustin Pop | @param hostname: hostname that will be resolved and its
|
993 | 58885d79 | Iustin Pop | full and shot name will be removed from
|
994 | 58885d79 | Iustin Pop | L{constants.ETC_HOSTS}
|
995 | 58885d79 | Iustin Pop |
|
996 | d9c02ca6 | Michael Hanselmann | """
|
997 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
998 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.name) |
999 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.ShortName()) |
1000 | d9c02ca6 | Michael Hanselmann | |
1001 | d9c02ca6 | Michael Hanselmann | |
1002 | a8083063 | Iustin Pop | def CreateBackup(file_name): |
1003 | a8083063 | Iustin Pop | """Creates a backup of a file.
|
1004 | a8083063 | Iustin Pop |
|
1005 | 58885d79 | Iustin Pop | @type file_name: str
|
1006 | 58885d79 | Iustin Pop | @param file_name: file to be backed up
|
1007 | 58885d79 | Iustin Pop | @rtype: str
|
1008 | 58885d79 | Iustin Pop | @return: the path to the newly created backup
|
1009 | 58885d79 | Iustin Pop | @raise errors.ProgrammerError: for invalid file names
|
1010 | a8083063 | Iustin Pop |
|
1011 | a8083063 | Iustin Pop | """
|
1012 | a8083063 | Iustin Pop | if not os.path.isfile(file_name): |
1013 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Can't make a backup of a non-file '%s'" % |
1014 | 3ecf6786 | Iustin Pop | file_name) |
1015 | a8083063 | Iustin Pop | |
1016 | 081b1e69 | Michael Hanselmann | prefix = '%s.backup-%d.' % (os.path.basename(file_name), int(time.time())) |
1017 | 65fe4693 | Iustin Pop | dir_name = os.path.dirname(file_name) |
1018 | 081b1e69 | Michael Hanselmann | |
1019 | 081b1e69 | Michael Hanselmann | fsrc = open(file_name, 'rb') |
1020 | 081b1e69 | Michael Hanselmann | try:
|
1021 | 65fe4693 | Iustin Pop | (fd, backup_name) = tempfile.mkstemp(prefix=prefix, dir=dir_name) |
1022 | 081b1e69 | Michael Hanselmann | fdst = os.fdopen(fd, 'wb')
|
1023 | 081b1e69 | Michael Hanselmann | try:
|
1024 | 081b1e69 | Michael Hanselmann | shutil.copyfileobj(fsrc, fdst) |
1025 | 081b1e69 | Michael Hanselmann | finally:
|
1026 | 081b1e69 | Michael Hanselmann | fdst.close() |
1027 | 081b1e69 | Michael Hanselmann | finally:
|
1028 | 081b1e69 | Michael Hanselmann | fsrc.close() |
1029 | 081b1e69 | Michael Hanselmann | |
1030 | a8083063 | Iustin Pop | return backup_name
|
1031 | a8083063 | Iustin Pop | |
1032 | a8083063 | Iustin Pop | |
1033 | a8083063 | Iustin Pop | def ShellQuote(value): |
1034 | a8083063 | Iustin Pop | """Quotes shell argument according to POSIX.
|
1035 | 3ecf6786 | Iustin Pop |
|
1036 | 58885d79 | Iustin Pop | @type value: str
|
1037 | 58885d79 | Iustin Pop | @param value: the argument to be quoted
|
1038 | 58885d79 | Iustin Pop | @rtype: str
|
1039 | 58885d79 | Iustin Pop | @return: the quoted value
|
1040 | 58885d79 | Iustin Pop |
|
1041 | a8083063 | Iustin Pop | """
|
1042 | a8083063 | Iustin Pop | if _re_shell_unquoted.match(value):
|
1043 | a8083063 | Iustin Pop | return value
|
1044 | a8083063 | Iustin Pop | else:
|
1045 | a8083063 | Iustin Pop | return "'%s'" % value.replace("'", "'\\''") |
1046 | a8083063 | Iustin Pop | |
1047 | a8083063 | Iustin Pop | |
1048 | a8083063 | Iustin Pop | def ShellQuoteArgs(args): |
1049 | 58885d79 | Iustin Pop | """Quotes a list of shell arguments.
|
1050 | 58885d79 | Iustin Pop |
|
1051 | 58885d79 | Iustin Pop | @type args: list
|
1052 | 58885d79 | Iustin Pop | @param args: list of arguments to be quoted
|
1053 | 58885d79 | Iustin Pop | @rtype: str
|
1054 | 58885d79 | Iustin Pop | @return: the quoted arguments concatenaned with spaces
|
1055 | a8083063 | Iustin Pop |
|
1056 | a8083063 | Iustin Pop | """
|
1057 | a8083063 | Iustin Pop | return ' '.join([ShellQuote(i) for i in args]) |
1058 | 88d14415 | Michael Hanselmann | |
1059 | 88d14415 | Michael Hanselmann | |
1060 | b15d625f | Iustin Pop | def TcpPing(target, port, timeout=10, live_port_needed=False, source=None): |
1061 | 2c30e9d7 | Alexander Schreiber | """Simple ping implementation using TCP connect(2).
|
1062 | 2c30e9d7 | Alexander Schreiber |
|
1063 | 58885d79 | Iustin Pop | Check if the given IP is reachable by doing attempting a TCP connect
|
1064 | 58885d79 | Iustin Pop | to it.
|
1065 | 58885d79 | Iustin Pop |
|
1066 | 58885d79 | Iustin Pop | @type target: str
|
1067 | 58885d79 | Iustin Pop | @param target: the IP or hostname to ping
|
1068 | 58885d79 | Iustin Pop | @type port: int
|
1069 | 58885d79 | Iustin Pop | @param port: the port to connect to
|
1070 | 58885d79 | Iustin Pop | @type timeout: int
|
1071 | 58885d79 | Iustin Pop | @param timeout: the timeout on the connection attemp
|
1072 | 58885d79 | Iustin Pop | @type live_port_needed: boolean
|
1073 | 58885d79 | Iustin Pop | @param live_port_needed: whether a closed port will cause the
|
1074 | 58885d79 | Iustin Pop | function to return failure, as if there was a timeout
|
1075 | 58885d79 | Iustin Pop | @type source: str or None
|
1076 | 58885d79 | Iustin Pop | @param source: if specified, will cause the connect to be made
|
1077 | 58885d79 | Iustin Pop | from this specific source address; failures to bind other
|
1078 | 58885d79 | Iustin Pop | than C{EADDRNOTAVAIL} will be ignored
|
1079 | 2c30e9d7 | Alexander Schreiber |
|
1080 | 2c30e9d7 | Alexander Schreiber | """
|
1081 | 2c30e9d7 | Alexander Schreiber | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
1082 | 2c30e9d7 | Alexander Schreiber | |
1083 | 0b5ad33e | Iustin Pop | success = False
|
1084 | 2c30e9d7 | Alexander Schreiber | |
1085 | b15d625f | Iustin Pop | if source is not None: |
1086 | b15d625f | Iustin Pop | try:
|
1087 | b15d625f | Iustin Pop | sock.bind((source, 0))
|
1088 | b15d625f | Iustin Pop | except socket.error, (errcode, errstring):
|
1089 | b15d625f | Iustin Pop | if errcode == errno.EADDRNOTAVAIL:
|
1090 | b15d625f | Iustin Pop | success = False
|
1091 | 2c30e9d7 | Alexander Schreiber | |
1092 | 2c30e9d7 | Alexander Schreiber | sock.settimeout(timeout) |
1093 | 2c30e9d7 | Alexander Schreiber | |
1094 | 2c30e9d7 | Alexander Schreiber | try:
|
1095 | 2c30e9d7 | Alexander Schreiber | sock.connect((target, port)) |
1096 | 2c30e9d7 | Alexander Schreiber | sock.close() |
1097 | 2c30e9d7 | Alexander Schreiber | success = True
|
1098 | 2c30e9d7 | Alexander Schreiber | except socket.timeout:
|
1099 | 2c30e9d7 | Alexander Schreiber | success = False
|
1100 | 2c30e9d7 | Alexander Schreiber | except socket.error, (errcode, errstring):
|
1101 | 4ca1b175 | Alexander Schreiber | success = (not live_port_needed) and (errcode == errno.ECONNREFUSED) |
1102 | 2c30e9d7 | Alexander Schreiber | |
1103 | 2c30e9d7 | Alexander Schreiber | return success
|
1104 | eedbda4b | Michael Hanselmann | |
1105 | eedbda4b | Michael Hanselmann | |
1106 | caad16e2 | Iustin Pop | def OwnIpAddress(address): |
1107 | caad16e2 | Iustin Pop | """Check if the current host has the the given IP address.
|
1108 | caad16e2 | Iustin Pop |
|
1109 | 58885d79 | Iustin Pop | Currently this is done by TCP-pinging the address from the loopback
|
1110 | caad16e2 | Iustin Pop | address.
|
1111 | caad16e2 | Iustin Pop |
|
1112 | caad16e2 | Iustin Pop | @type address: string
|
1113 | caad16e2 | Iustin Pop | @param address: the addres to check
|
1114 | caad16e2 | Iustin Pop | @rtype: bool
|
1115 | 58885d79 | Iustin Pop | @return: True if we own the address
|
1116 | caad16e2 | Iustin Pop |
|
1117 | caad16e2 | Iustin Pop | """
|
1118 | caad16e2 | Iustin Pop | return TcpPing(address, constants.DEFAULT_NODED_PORT,
|
1119 | caad16e2 | Iustin Pop | source=constants.LOCALHOST_IP_ADDRESS) |
1120 | caad16e2 | Iustin Pop | |
1121 | caad16e2 | Iustin Pop | |
1122 | eedbda4b | Michael Hanselmann | def ListVisibleFiles(path): |
1123 | 58885d79 | Iustin Pop | """Returns a list of visible files in a directory.
|
1124 | 58885d79 | Iustin Pop |
|
1125 | 58885d79 | Iustin Pop | @type path: str
|
1126 | 58885d79 | Iustin Pop | @param path: the directory to enumerate
|
1127 | 58885d79 | Iustin Pop | @rtype: list
|
1128 | 58885d79 | Iustin Pop | @return: the list of all files not starting with a dot
|
1129 | eedbda4b | Michael Hanselmann |
|
1130 | eedbda4b | Michael Hanselmann | """
|
1131 | f3299a07 | Michael Hanselmann | files = [i for i in os.listdir(path) if not i.startswith(".")] |
1132 | f3299a07 | Michael Hanselmann | files.sort() |
1133 | f3299a07 | Michael Hanselmann | return files
|
1134 | 2f8b60b3 | Iustin Pop | |
1135 | 2f8b60b3 | Iustin Pop | |
1136 | 257f4c0a | Iustin Pop | def GetHomeDir(user, default=None): |
1137 | 257f4c0a | Iustin Pop | """Try to get the homedir of the given user.
|
1138 | 257f4c0a | Iustin Pop |
|
1139 | 257f4c0a | Iustin Pop | The user can be passed either as a string (denoting the name) or as
|
1140 | 257f4c0a | Iustin Pop | an integer (denoting the user id). If the user is not found, the
|
1141 | 257f4c0a | Iustin Pop | 'default' argument is returned, which defaults to None.
|
1142 | 2f8b60b3 | Iustin Pop |
|
1143 | 2f8b60b3 | Iustin Pop | """
|
1144 | 2f8b60b3 | Iustin Pop | try:
|
1145 | 257f4c0a | Iustin Pop | if isinstance(user, basestring): |
1146 | 257f4c0a | Iustin Pop | result = pwd.getpwnam(user) |
1147 | 257f4c0a | Iustin Pop | elif isinstance(user, (int, long)): |
1148 | 257f4c0a | Iustin Pop | result = pwd.getpwuid(user) |
1149 | 257f4c0a | Iustin Pop | else:
|
1150 | 257f4c0a | Iustin Pop | raise errors.ProgrammerError("Invalid type passed to GetHomeDir (%s)" % |
1151 | 257f4c0a | Iustin Pop | type(user))
|
1152 | 2f8b60b3 | Iustin Pop | except KeyError: |
1153 | 2f8b60b3 | Iustin Pop | return default
|
1154 | 2f8b60b3 | Iustin Pop | return result.pw_dir
|
1155 | 59072e7e | Michael Hanselmann | |
1156 | 59072e7e | Michael Hanselmann | |
1157 | 24818e8f | Michael Hanselmann | def NewUUID(): |
1158 | 59072e7e | Michael Hanselmann | """Returns a random UUID.
|
1159 | 59072e7e | Michael Hanselmann |
|
1160 | 58885d79 | Iustin Pop | @note: This is a Linux-specific method as it uses the /proc
|
1161 | 58885d79 | Iustin Pop | filesystem.
|
1162 | 58885d79 | Iustin Pop | @rtype: str
|
1163 | 58885d79 | Iustin Pop |
|
1164 | 59072e7e | Michael Hanselmann | """
|
1165 | 59072e7e | Michael Hanselmann | f = open("/proc/sys/kernel/random/uuid", "r") |
1166 | 59072e7e | Michael Hanselmann | try:
|
1167 | 59072e7e | Michael Hanselmann | return f.read(128).rstrip("\n") |
1168 | 59072e7e | Michael Hanselmann | finally:
|
1169 | 59072e7e | Michael Hanselmann | f.close() |
1170 | 087b34fe | Iustin Pop | |
1171 | 087b34fe | Iustin Pop | |
1172 | 33081d90 | Iustin Pop | def GenerateSecret(): |
1173 | 33081d90 | Iustin Pop | """Generates a random secret.
|
1174 | 33081d90 | Iustin Pop |
|
1175 | 33081d90 | Iustin Pop | This will generate a pseudo-random secret, and return its sha digest
|
1176 | 33081d90 | Iustin Pop | (so that it can be used where an ASCII string is needed).
|
1177 | 33081d90 | Iustin Pop |
|
1178 | 58885d79 | Iustin Pop | @rtype: str
|
1179 | 58885d79 | Iustin Pop | @return: a sha1 hexdigest of a block of 64 random bytes
|
1180 | 58885d79 | Iustin Pop |
|
1181 | 33081d90 | Iustin Pop | """
|
1182 | 33081d90 | Iustin Pop | return sha.new(os.urandom(64)).hexdigest() |
1183 | 33081d90 | Iustin Pop | |
1184 | 33081d90 | Iustin Pop | |
1185 | 9dae41ad | Guido Trotter | def EnsureDirs(dirs): |
1186 | 9dae41ad | Guido Trotter | """Make required directories, if they don't exist.
|
1187 | 9dae41ad | Guido Trotter |
|
1188 | 9dae41ad | Guido Trotter | @param dirs: list of tuples (dir_name, dir_mode)
|
1189 | 9dae41ad | Guido Trotter | @type dirs: list of (string, integer)
|
1190 | 9dae41ad | Guido Trotter |
|
1191 | 9dae41ad | Guido Trotter | """
|
1192 | 9dae41ad | Guido Trotter | for dir_name, dir_mode in dirs: |
1193 | 9dae41ad | Guido Trotter | try:
|
1194 | 1b2c8f85 | Iustin Pop | os.mkdir(dir_name, dir_mode) |
1195 | 9dae41ad | Guido Trotter | except EnvironmentError, err: |
1196 | 9dae41ad | Guido Trotter | if err.errno != errno.EEXIST:
|
1197 | 9dae41ad | Guido Trotter | raise errors.GenericError("Cannot create needed directory" |
1198 | 1b2c8f85 | Iustin Pop | " '%s': %s" % (dir_name, err))
|
1199 | 9dae41ad | Guido Trotter | if not os.path.isdir(dir_name): |
1200 | 9dae41ad | Guido Trotter | raise errors.GenericError("%s is not a directory" % dir_name) |
1201 | 9dae41ad | Guido Trotter | |
1202 | 9dae41ad | Guido Trotter | |
1203 | ca0aa6d0 | Michael Hanselmann | def ReadFile(file_name, size=None): |
1204 | ca0aa6d0 | Michael Hanselmann | """Reads a file.
|
1205 | ca0aa6d0 | Michael Hanselmann |
|
1206 | ca0aa6d0 | Michael Hanselmann | @type size: None or int
|
1207 | ca0aa6d0 | Michael Hanselmann | @param size: Read at most size bytes
|
1208 | 58885d79 | Iustin Pop | @rtype: str
|
1209 | 58885d79 | Iustin Pop | @return: the (possibly partial) conent of the file
|
1210 | ca0aa6d0 | Michael Hanselmann |
|
1211 | ca0aa6d0 | Michael Hanselmann | """
|
1212 | ca0aa6d0 | Michael Hanselmann | f = open(file_name, "r") |
1213 | ca0aa6d0 | Michael Hanselmann | try:
|
1214 | ca0aa6d0 | Michael Hanselmann | if size is None: |
1215 | ca0aa6d0 | Michael Hanselmann | return f.read()
|
1216 | ca0aa6d0 | Michael Hanselmann | else:
|
1217 | ca0aa6d0 | Michael Hanselmann | return f.read(size)
|
1218 | ca0aa6d0 | Michael Hanselmann | finally:
|
1219 | ca0aa6d0 | Michael Hanselmann | f.close() |
1220 | ca0aa6d0 | Michael Hanselmann | |
1221 | ca0aa6d0 | Michael Hanselmann | |
1222 | 087b34fe | Iustin Pop | def WriteFile(file_name, fn=None, data=None, |
1223 | 087b34fe | Iustin Pop | mode=None, uid=-1, gid=-1, |
1224 | 71714516 | Michael Hanselmann | atime=None, mtime=None, close=True, |
1225 | 04a8d789 | Michael Hanselmann | dry_run=False, backup=False, |
1226 | 71714516 | Michael Hanselmann | prewrite=None, postwrite=None): |
1227 | 087b34fe | Iustin Pop | """(Over)write a file atomically.
|
1228 | 087b34fe | Iustin Pop |
|
1229 | 087b34fe | Iustin Pop | The file_name and either fn (a function taking one argument, the
|
1230 | 087b34fe | Iustin Pop | file descriptor, and which should write the data to it) or data (the
|
1231 | 087b34fe | Iustin Pop | contents of the file) must be passed. The other arguments are
|
1232 | 087b34fe | Iustin Pop | optional and allow setting the file mode, owner and group, and the
|
1233 | 087b34fe | Iustin Pop | mtime/atime of the file.
|
1234 | 087b34fe | Iustin Pop |
|
1235 | 087b34fe | Iustin Pop | If the function doesn't raise an exception, it has succeeded and the
|
1236 | 69efe319 | Michael Hanselmann | target file has the new contents. If the function has raised an
|
1237 | 087b34fe | Iustin Pop | exception, an existing target file should be unmodified and the
|
1238 | 087b34fe | Iustin Pop | temporary file should be removed.
|
1239 | 087b34fe | Iustin Pop |
|
1240 | 58885d79 | Iustin Pop | @type file_name: str
|
1241 | 58885d79 | Iustin Pop | @param file_name: the target filename
|
1242 | 58885d79 | Iustin Pop | @type fn: callable
|
1243 | 58885d79 | Iustin Pop | @param fn: content writing function, called with
|
1244 | 58885d79 | Iustin Pop | file descriptor as parameter
|
1245 | 69efe319 | Michael Hanselmann | @type data: str
|
1246 | 58885d79 | Iustin Pop | @param data: contents of the file
|
1247 | 58885d79 | Iustin Pop | @type mode: int
|
1248 | 58885d79 | Iustin Pop | @param mode: file mode
|
1249 | 58885d79 | Iustin Pop | @type uid: int
|
1250 | 58885d79 | Iustin Pop | @param uid: the owner of the file
|
1251 | 58885d79 | Iustin Pop | @type gid: int
|
1252 | 58885d79 | Iustin Pop | @param gid: the group of the file
|
1253 | 58885d79 | Iustin Pop | @type atime: int
|
1254 | 58885d79 | Iustin Pop | @param atime: a custom access time to be set on the file
|
1255 | 58885d79 | Iustin Pop | @type mtime: int
|
1256 | 58885d79 | Iustin Pop | @param mtime: a custom modification time to be set on the file
|
1257 | 58885d79 | Iustin Pop | @type close: boolean
|
1258 | 58885d79 | Iustin Pop | @param close: whether to close file after writing it
|
1259 | 58885d79 | Iustin Pop | @type prewrite: callable
|
1260 | 58885d79 | Iustin Pop | @param prewrite: function to be called before writing content
|
1261 | 58885d79 | Iustin Pop | @type postwrite: callable
|
1262 | 58885d79 | Iustin Pop | @param postwrite: function to be called after writing content
|
1263 | 58885d79 | Iustin Pop |
|
1264 | 58885d79 | Iustin Pop | @rtype: None or int
|
1265 | 58885d79 | Iustin Pop | @return: None if the 'close' parameter evaluates to True,
|
1266 | 58885d79 | Iustin Pop | otherwise the file descriptor
|
1267 | 58885d79 | Iustin Pop |
|
1268 | 69efe319 | Michael Hanselmann | @raise errors.ProgrammerError: if any of the arguments are not valid
|
1269 | 71714516 | Michael Hanselmann |
|
1270 | 087b34fe | Iustin Pop | """
|
1271 | 04a8d789 | Michael Hanselmann | if not os.path.isabs(file_name): |
1272 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Path passed to WriteFile is not" |
1273 | 087b34fe | Iustin Pop | " absolute: '%s'" % file_name)
|
1274 | 087b34fe | Iustin Pop | |
1275 | 087b34fe | Iustin Pop | if [fn, data].count(None) != 1: |
1276 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("fn or data required") |
1277 | 087b34fe | Iustin Pop | |
1278 | 087b34fe | Iustin Pop | if [atime, mtime].count(None) == 1: |
1279 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Both atime and mtime must be either" |
1280 | 087b34fe | Iustin Pop | " set or None")
|
1281 | 087b34fe | Iustin Pop | |
1282 | 70f4497c | Michael Hanselmann | if backup and not dry_run and os.path.isfile(file_name): |
1283 | 70f4497c | Michael Hanselmann | CreateBackup(file_name) |
1284 | 087b34fe | Iustin Pop | |
1285 | 087b34fe | Iustin Pop | dir_name, base_name = os.path.split(file_name) |
1286 | 087b34fe | Iustin Pop | fd, new_name = tempfile.mkstemp('.new', base_name, dir_name)
|
1287 | 087b34fe | Iustin Pop | # here we need to make sure we remove the temp file, if any error
|
1288 | 087b34fe | Iustin Pop | # leaves it in place
|
1289 | 087b34fe | Iustin Pop | try:
|
1290 | 087b34fe | Iustin Pop | if uid != -1 or gid != -1: |
1291 | 087b34fe | Iustin Pop | os.chown(new_name, uid, gid) |
1292 | 087b34fe | Iustin Pop | if mode:
|
1293 | 087b34fe | Iustin Pop | os.chmod(new_name, mode) |
1294 | 71714516 | Michael Hanselmann | if callable(prewrite): |
1295 | 71714516 | Michael Hanselmann | prewrite(fd) |
1296 | 087b34fe | Iustin Pop | if data is not None: |
1297 | 087b34fe | Iustin Pop | os.write(fd, data) |
1298 | 087b34fe | Iustin Pop | else:
|
1299 | 087b34fe | Iustin Pop | fn(fd) |
1300 | 71714516 | Michael Hanselmann | if callable(postwrite): |
1301 | 71714516 | Michael Hanselmann | postwrite(fd) |
1302 | 087b34fe | Iustin Pop | os.fsync(fd) |
1303 | 087b34fe | Iustin Pop | if atime is not None and mtime is not None: |
1304 | 087b34fe | Iustin Pop | os.utime(new_name, (atime, mtime)) |
1305 | 70f4497c | Michael Hanselmann | if not dry_run: |
1306 | 70f4497c | Michael Hanselmann | os.rename(new_name, file_name) |
1307 | 087b34fe | Iustin Pop | finally:
|
1308 | 71714516 | Michael Hanselmann | if close:
|
1309 | 71714516 | Michael Hanselmann | os.close(fd) |
1310 | 71714516 | Michael Hanselmann | result = None
|
1311 | 71714516 | Michael Hanselmann | else:
|
1312 | 71714516 | Michael Hanselmann | result = fd |
1313 | 087b34fe | Iustin Pop | RemoveFile(new_name) |
1314 | 78feb6fb | Guido Trotter | |
1315 | 71714516 | Michael Hanselmann | return result
|
1316 | 71714516 | Michael Hanselmann | |
1317 | 78feb6fb | Guido Trotter | |
1318 | 7b4126b7 | Iustin Pop | def FirstFree(seq, base=0): |
1319 | 7b4126b7 | Iustin Pop | """Returns the first non-existing integer from seq.
|
1320 | 7b4126b7 | Iustin Pop |
|
1321 | 7b4126b7 | Iustin Pop | The seq argument should be a sorted list of positive integers. The
|
1322 | 7b4126b7 | Iustin Pop | first time the index of an element is smaller than the element
|
1323 | 7b4126b7 | Iustin Pop | value, the index will be returned.
|
1324 | 7b4126b7 | Iustin Pop |
|
1325 | 7b4126b7 | Iustin Pop | The base argument is used to start at a different offset,
|
1326 | 58885d79 | Iustin Pop | i.e. C{[3, 4, 6]} with I{offset=3} will return 5.
|
1327 | 58885d79 | Iustin Pop |
|
1328 | 58885d79 | Iustin Pop | Example: C{[0, 1, 3]} will return I{2}.
|
1329 | 7b4126b7 | Iustin Pop |
|
1330 | 58885d79 | Iustin Pop | @type seq: sequence
|
1331 | 58885d79 | Iustin Pop | @param seq: the sequence to be analyzed.
|
1332 | 58885d79 | Iustin Pop | @type base: int
|
1333 | 58885d79 | Iustin Pop | @param base: use this value as the base index of the sequence
|
1334 | 58885d79 | Iustin Pop | @rtype: int
|
1335 | 58885d79 | Iustin Pop | @return: the first non-used index in the sequence
|
1336 | 7b4126b7 | Iustin Pop |
|
1337 | 7b4126b7 | Iustin Pop | """
|
1338 | 7b4126b7 | Iustin Pop | for idx, elem in enumerate(seq): |
1339 | 7b4126b7 | Iustin Pop | assert elem >= base, "Passed element is higher than base offset" |
1340 | 7b4126b7 | Iustin Pop | if elem > idx + base:
|
1341 | 7b4126b7 | Iustin Pop | # idx is not used
|
1342 | 7b4126b7 | Iustin Pop | return idx + base
|
1343 | 7b4126b7 | Iustin Pop | return None |
1344 | 7b4126b7 | Iustin Pop | |
1345 | 7b4126b7 | Iustin Pop | |
1346 | 78feb6fb | Guido Trotter | def all(seq, pred=bool): |
1347 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for every element in the iterable"
|
1348 | 78feb6fb | Guido Trotter | for elem in itertools.ifilterfalse(pred, seq): |
1349 | 78feb6fb | Guido Trotter | return False |
1350 | 78feb6fb | Guido Trotter | return True |
1351 | 78feb6fb | Guido Trotter | |
1352 | 78feb6fb | Guido Trotter | |
1353 | 78feb6fb | Guido Trotter | def any(seq, pred=bool): |
1354 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for at least one element in the iterable"
|
1355 | 78feb6fb | Guido Trotter | for elem in itertools.ifilter(pred, seq): |
1356 | 78feb6fb | Guido Trotter | return True |
1357 | 78feb6fb | Guido Trotter | return False |
1358 | f7414041 | Michael Hanselmann | |
1359 | f7414041 | Michael Hanselmann | |
1360 | f7414041 | Michael Hanselmann | def UniqueSequence(seq): |
1361 | f7414041 | Michael Hanselmann | """Returns a list with unique elements.
|
1362 | f7414041 | Michael Hanselmann |
|
1363 | f7414041 | Michael Hanselmann | Element order is preserved.
|
1364 | 58885d79 | Iustin Pop |
|
1365 | 58885d79 | Iustin Pop | @type seq: sequence
|
1366 | 58885d79 | Iustin Pop | @param seq: the sequence with the source elementes
|
1367 | 58885d79 | Iustin Pop | @rtype: list
|
1368 | 58885d79 | Iustin Pop | @return: list of unique elements from seq
|
1369 | 58885d79 | Iustin Pop |
|
1370 | f7414041 | Michael Hanselmann | """
|
1371 | f7414041 | Michael Hanselmann | seen = set()
|
1372 | f7414041 | Michael Hanselmann | return [i for i in seq if i not in seen and not seen.add(i)] |
1373 | 1862d460 | Alexander Schreiber | |
1374 | 1862d460 | Alexander Schreiber | |
1375 | 1862d460 | Alexander Schreiber | def IsValidMac(mac): |
1376 | 1862d460 | Alexander Schreiber | """Predicate to check if a MAC address is valid.
|
1377 | 1862d460 | Alexander Schreiber |
|
1378 | 1862d460 | Alexander Schreiber | Checks wether the supplied MAC address is formally correct, only
|
1379 | 1862d460 | Alexander Schreiber | accepts colon separated format.
|
1380 | 58885d79 | Iustin Pop |
|
1381 | 58885d79 | Iustin Pop | @type mac: str
|
1382 | 58885d79 | Iustin Pop | @param mac: the MAC to be validated
|
1383 | 58885d79 | Iustin Pop | @rtype: boolean
|
1384 | 58885d79 | Iustin Pop | @return: True is the MAC seems valid
|
1385 | 58885d79 | Iustin Pop |
|
1386 | 1862d460 | Alexander Schreiber | """
|
1387 | 1862d460 | Alexander Schreiber | mac_check = re.compile("^([0-9a-f]{2}(:|$)){6}$")
|
1388 | 1862d460 | Alexander Schreiber | return mac_check.match(mac) is not None |
1389 | 06009e27 | Iustin Pop | |
1390 | 06009e27 | Iustin Pop | |
1391 | 06009e27 | Iustin Pop | def TestDelay(duration): |
1392 | 06009e27 | Iustin Pop | """Sleep for a fixed amount of time.
|
1393 | 06009e27 | Iustin Pop |
|
1394 | 58885d79 | Iustin Pop | @type duration: float
|
1395 | 58885d79 | Iustin Pop | @param duration: the sleep duration
|
1396 | 58885d79 | Iustin Pop | @rtype: boolean
|
1397 | 58885d79 | Iustin Pop | @return: False for negative value, True otherwise
|
1398 | 58885d79 | Iustin Pop |
|
1399 | 06009e27 | Iustin Pop | """
|
1400 | 06009e27 | Iustin Pop | if duration < 0: |
1401 | 06009e27 | Iustin Pop | return False |
1402 | 06009e27 | Iustin Pop | time.sleep(duration) |
1403 | 06009e27 | Iustin Pop | return True |
1404 | 8f765069 | Iustin Pop | |
1405 | 8f765069 | Iustin Pop | |
1406 | 7d88772a | Iustin Pop | def _CloseFDNoErr(fd, retries=5): |
1407 | 7d88772a | Iustin Pop | """Close a file descriptor ignoring errors.
|
1408 | 8f765069 | Iustin Pop |
|
1409 | 7d88772a | Iustin Pop | @type fd: int
|
1410 | 7d88772a | Iustin Pop | @param fd: the file descriptor
|
1411 | 7d88772a | Iustin Pop | @type retries: int
|
1412 | 7d88772a | Iustin Pop | @param retries: how many retries to make, in case we get any
|
1413 | 7d88772a | Iustin Pop | other error than EBADF
|
1414 | 7d88772a | Iustin Pop |
|
1415 | 7d88772a | Iustin Pop | """
|
1416 | 7d88772a | Iustin Pop | try:
|
1417 | 7d88772a | Iustin Pop | os.close(fd) |
1418 | 7d88772a | Iustin Pop | except OSError, err: |
1419 | 7d88772a | Iustin Pop | if err.errno != errno.EBADF:
|
1420 | 7d88772a | Iustin Pop | if retries > 0: |
1421 | 7d88772a | Iustin Pop | _CloseFDNoErr(fd, retries - 1)
|
1422 | 7d88772a | Iustin Pop | # else either it's closed already or we're out of retries, so we
|
1423 | 7d88772a | Iustin Pop | # ignore this and go on
|
1424 | 7d88772a | Iustin Pop | |
1425 | 7d88772a | Iustin Pop | |
1426 | 7d88772a | Iustin Pop | def CloseFDs(noclose_fds=None): |
1427 | 7d88772a | Iustin Pop | """Close file descriptors.
|
1428 | 7d88772a | Iustin Pop |
|
1429 | 7d88772a | Iustin Pop | This closes all file descriptors above 2 (i.e. except
|
1430 | 7d88772a | Iustin Pop | stdin/out/err).
|
1431 | 8f765069 | Iustin Pop |
|
1432 | 58885d79 | Iustin Pop | @type noclose_fds: list or None
|
1433 | 58885d79 | Iustin Pop | @param noclose_fds: if given, it denotes a list of file descriptor
|
1434 | 58885d79 | Iustin Pop | that should not be closed
|
1435 | 58885d79 | Iustin Pop |
|
1436 | 8f765069 | Iustin Pop | """
|
1437 | 8f765069 | Iustin Pop | # Default maximum for the number of available file descriptors.
|
1438 | 8f765069 | Iustin Pop | if 'SC_OPEN_MAX' in os.sysconf_names: |
1439 | 8f765069 | Iustin Pop | try:
|
1440 | 8f765069 | Iustin Pop | MAXFD = os.sysconf('SC_OPEN_MAX')
|
1441 | 8f765069 | Iustin Pop | if MAXFD < 0: |
1442 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1443 | 8f765069 | Iustin Pop | except OSError: |
1444 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1445 | 8f765069 | Iustin Pop | else:
|
1446 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1447 | 7d88772a | Iustin Pop | maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
|
1448 | 7d88772a | Iustin Pop | if (maxfd == resource.RLIM_INFINITY):
|
1449 | 7d88772a | Iustin Pop | maxfd = MAXFD |
1450 | 7d88772a | Iustin Pop | |
1451 | 7d88772a | Iustin Pop | # Iterate through and close all file descriptors (except the standard ones)
|
1452 | 7d88772a | Iustin Pop | for fd in range(3, maxfd): |
1453 | 7d88772a | Iustin Pop | if noclose_fds and fd in noclose_fds: |
1454 | 7d88772a | Iustin Pop | continue
|
1455 | 7d88772a | Iustin Pop | _CloseFDNoErr(fd) |
1456 | 7d88772a | Iustin Pop | |
1457 | 7d88772a | Iustin Pop | |
1458 | 7d88772a | Iustin Pop | def Daemonize(logfile): |
1459 | 7d88772a | Iustin Pop | """Daemonize the current process.
|
1460 | 7d88772a | Iustin Pop |
|
1461 | 7d88772a | Iustin Pop | This detaches the current process from the controlling terminal and
|
1462 | 7d88772a | Iustin Pop | runs it in the background as a daemon.
|
1463 | 7d88772a | Iustin Pop |
|
1464 | 7d88772a | Iustin Pop | @type logfile: str
|
1465 | 7d88772a | Iustin Pop | @param logfile: the logfile to which we should redirect stdout/stderr
|
1466 | 7d88772a | Iustin Pop | @rtype: int
|
1467 | 5fcc718f | Iustin Pop | @return: the value zero
|
1468 | 7d88772a | Iustin Pop |
|
1469 | 7d88772a | Iustin Pop | """
|
1470 | 7d88772a | Iustin Pop | UMASK = 077
|
1471 | 7d88772a | Iustin Pop | WORKDIR = "/"
|
1472 | 8f765069 | Iustin Pop | |
1473 | 8f765069 | Iustin Pop | # this might fail
|
1474 | 8f765069 | Iustin Pop | pid = os.fork() |
1475 | 8f765069 | Iustin Pop | if (pid == 0): # The first child. |
1476 | 8f765069 | Iustin Pop | os.setsid() |
1477 | 8f765069 | Iustin Pop | # this might fail
|
1478 | 8f765069 | Iustin Pop | pid = os.fork() # Fork a second child.
|
1479 | 8f765069 | Iustin Pop | if (pid == 0): # The second child. |
1480 | 8f765069 | Iustin Pop | os.chdir(WORKDIR) |
1481 | 8f765069 | Iustin Pop | os.umask(UMASK) |
1482 | 8f765069 | Iustin Pop | else:
|
1483 | 8f765069 | Iustin Pop | # exit() or _exit()? See below.
|
1484 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent (the first child) of the second child. |
1485 | 8f765069 | Iustin Pop | else:
|
1486 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent of the first child. |
1487 | 8f765069 | Iustin Pop | |
1488 | 7d88772a | Iustin Pop | for fd in range(3): |
1489 | 7d88772a | Iustin Pop | _CloseFDNoErr(fd) |
1490 | 7d88772a | Iustin Pop | i = os.open("/dev/null", os.O_RDONLY) # stdin |
1491 | 7d88772a | Iustin Pop | assert i == 0, "Can't close/reopen stdin" |
1492 | 7d88772a | Iustin Pop | i = os.open(logfile, os.O_WRONLY|os.O_CREAT|os.O_APPEND, 0600) # stdout |
1493 | 7d88772a | Iustin Pop | assert i == 1, "Can't close/reopen stdout" |
1494 | 7d88772a | Iustin Pop | # Duplicate standard output to standard error.
|
1495 | 7d88772a | Iustin Pop | os.dup2(1, 2) |
1496 | 8f765069 | Iustin Pop | return 0 |
1497 | 57c177af | Iustin Pop | |
1498 | 57c177af | Iustin Pop | |
1499 | 53beffbb | Iustin Pop | def DaemonPidFileName(name): |
1500 | 58885d79 | Iustin Pop | """Compute a ganeti pid file absolute path
|
1501 | 58885d79 | Iustin Pop |
|
1502 | 58885d79 | Iustin Pop | @type name: str
|
1503 | 58885d79 | Iustin Pop | @param name: the daemon name
|
1504 | 58885d79 | Iustin Pop | @rtype: str
|
1505 | 58885d79 | Iustin Pop | @return: the full path to the pidfile corresponding to the given
|
1506 | 58885d79 | Iustin Pop | daemon name
|
1507 | b330ac0b | Guido Trotter |
|
1508 | b330ac0b | Guido Trotter | """
|
1509 | b330ac0b | Guido Trotter | return os.path.join(constants.RUN_GANETI_DIR, "%s.pid" % name) |
1510 | b330ac0b | Guido Trotter | |
1511 | b330ac0b | Guido Trotter | |
1512 | b330ac0b | Guido Trotter | def WritePidFile(name): |
1513 | b330ac0b | Guido Trotter | """Write the current process pidfile.
|
1514 | b330ac0b | Guido Trotter |
|
1515 | 58885d79 | Iustin Pop | The file will be written to L{constants.RUN_GANETI_DIR}I{/name.pid}
|
1516 | 58885d79 | Iustin Pop |
|
1517 | 58885d79 | Iustin Pop | @type name: str
|
1518 | 58885d79 | Iustin Pop | @param name: the daemon name to use
|
1519 | 58885d79 | Iustin Pop | @raise errors.GenericError: if the pid file already exists and
|
1520 | 58885d79 | Iustin Pop | points to a live process
|
1521 | b330ac0b | Guido Trotter |
|
1522 | b330ac0b | Guido Trotter | """
|
1523 | b330ac0b | Guido Trotter | pid = os.getpid() |
1524 | 53beffbb | Iustin Pop | pidfilename = DaemonPidFileName(name) |
1525 | d9f311d7 | Iustin Pop | if IsProcessAlive(ReadPidFile(pidfilename)):
|
1526 | 533bb4b1 | Michael Hanselmann | raise errors.GenericError("%s contains a live process" % pidfilename) |
1527 | b330ac0b | Guido Trotter | |
1528 | b330ac0b | Guido Trotter | WriteFile(pidfilename, data="%d\n" % pid)
|
1529 | b330ac0b | Guido Trotter | |
1530 | b330ac0b | Guido Trotter | |
1531 | b330ac0b | Guido Trotter | def RemovePidFile(name): |
1532 | b330ac0b | Guido Trotter | """Remove the current process pidfile.
|
1533 | b330ac0b | Guido Trotter |
|
1534 | b330ac0b | Guido Trotter | Any errors are ignored.
|
1535 | b330ac0b | Guido Trotter |
|
1536 | 58885d79 | Iustin Pop | @type name: str
|
1537 | 58885d79 | Iustin Pop | @param name: the daemon name used to derive the pidfile name
|
1538 | 58885d79 | Iustin Pop |
|
1539 | b330ac0b | Guido Trotter | """
|
1540 | b330ac0b | Guido Trotter | pid = os.getpid() |
1541 | 53beffbb | Iustin Pop | pidfilename = DaemonPidFileName(name) |
1542 | b330ac0b | Guido Trotter | # TODO: we could check here that the file contains our pid
|
1543 | b330ac0b | Guido Trotter | try:
|
1544 | b330ac0b | Guido Trotter | RemoveFile(pidfilename) |
1545 | b330ac0b | Guido Trotter | except:
|
1546 | b330ac0b | Guido Trotter | pass
|
1547 | b330ac0b | Guido Trotter | |
1548 | b330ac0b | Guido Trotter | |
1549 | ff5251bc | Iustin Pop | def KillProcess(pid, signal_=signal.SIGTERM, timeout=30, |
1550 | ff5251bc | Iustin Pop | waitpid=False):
|
1551 | b2a1f511 | Iustin Pop | """Kill a process given by its pid.
|
1552 | b2a1f511 | Iustin Pop |
|
1553 | b2a1f511 | Iustin Pop | @type pid: int
|
1554 | b2a1f511 | Iustin Pop | @param pid: The PID to terminate.
|
1555 | 38206f3c | Iustin Pop | @type signal_: int
|
1556 | 38206f3c | Iustin Pop | @param signal_: The signal to send, by default SIGTERM
|
1557 | b2a1f511 | Iustin Pop | @type timeout: int
|
1558 | b2a1f511 | Iustin Pop | @param timeout: The timeout after which, if the process is still alive,
|
1559 | b2a1f511 | Iustin Pop | a SIGKILL will be sent. If not positive, no such checking
|
1560 | b2a1f511 | Iustin Pop | will be done
|
1561 | ff5251bc | Iustin Pop | @type waitpid: boolean
|
1562 | ff5251bc | Iustin Pop | @param waitpid: If true, we should waitpid on this process after
|
1563 | ff5251bc | Iustin Pop | sending signals, since it's our own child and otherwise it
|
1564 | ff5251bc | Iustin Pop | would remain as zombie
|
1565 | b2a1f511 | Iustin Pop |
|
1566 | b2a1f511 | Iustin Pop | """
|
1567 | ff5251bc | Iustin Pop | def _helper(pid, signal_, wait): |
1568 | ff5251bc | Iustin Pop | """Simple helper to encapsulate the kill/waitpid sequence"""
|
1569 | ff5251bc | Iustin Pop | os.kill(pid, signal_) |
1570 | ff5251bc | Iustin Pop | if wait:
|
1571 | ff5251bc | Iustin Pop | try:
|
1572 | ff5251bc | Iustin Pop | os.waitpid(pid, os.WNOHANG) |
1573 | ff5251bc | Iustin Pop | except OSError: |
1574 | ff5251bc | Iustin Pop | pass
|
1575 | ff5251bc | Iustin Pop | |
1576 | b2a1f511 | Iustin Pop | if pid <= 0: |
1577 | b2a1f511 | Iustin Pop | # kill with pid=0 == suicide
|
1578 | b2a1f511 | Iustin Pop | raise errors.ProgrammerError("Invalid pid given '%s'" % pid) |
1579 | b2a1f511 | Iustin Pop | |
1580 | b2a1f511 | Iustin Pop | if not IsProcessAlive(pid): |
1581 | b2a1f511 | Iustin Pop | return
|
1582 | ff5251bc | Iustin Pop | _helper(pid, signal_, waitpid) |
1583 | b2a1f511 | Iustin Pop | if timeout <= 0: |
1584 | b2a1f511 | Iustin Pop | return
|
1585 | 7167159a | Michael Hanselmann | |
1586 | 7167159a | Michael Hanselmann | # Wait up to $timeout seconds
|
1587 | b2a1f511 | Iustin Pop | end = time.time() + timeout |
1588 | 7167159a | Michael Hanselmann | wait = 0.01
|
1589 | b2a1f511 | Iustin Pop | while time.time() < end and IsProcessAlive(pid): |
1590 | 7167159a | Michael Hanselmann | try:
|
1591 | 7167159a | Michael Hanselmann | (result_pid, _) = os.waitpid(pid, os.WNOHANG) |
1592 | 7167159a | Michael Hanselmann | if result_pid > 0: |
1593 | 7167159a | Michael Hanselmann | break
|
1594 | 7167159a | Michael Hanselmann | except OSError: |
1595 | 7167159a | Michael Hanselmann | pass
|
1596 | 7167159a | Michael Hanselmann | time.sleep(wait) |
1597 | 7167159a | Michael Hanselmann | # Make wait time longer for next try
|
1598 | 7167159a | Michael Hanselmann | if wait < 0.1: |
1599 | 7167159a | Michael Hanselmann | wait *= 1.5
|
1600 | 7167159a | Michael Hanselmann | |
1601 | b2a1f511 | Iustin Pop | if IsProcessAlive(pid):
|
1602 | 7167159a | Michael Hanselmann | # Kill process if it's still alive
|
1603 | e1bd0072 | Iustin Pop | _helper(pid, signal.SIGKILL, waitpid) |
1604 | b2a1f511 | Iustin Pop | |
1605 | b2a1f511 | Iustin Pop | |
1606 | 57c177af | Iustin Pop | def FindFile(name, search_path, test=os.path.exists): |
1607 | 57c177af | Iustin Pop | """Look for a filesystem object in a given path.
|
1608 | 57c177af | Iustin Pop |
|
1609 | 57c177af | Iustin Pop | This is an abstract method to search for filesystem object (files,
|
1610 | 57c177af | Iustin Pop | dirs) under a given search path.
|
1611 | 57c177af | Iustin Pop |
|
1612 | 58885d79 | Iustin Pop | @type name: str
|
1613 | 58885d79 | Iustin Pop | @param name: the name to look for
|
1614 | 58885d79 | Iustin Pop | @type search_path: str
|
1615 | 58885d79 | Iustin Pop | @param search_path: location to start at
|
1616 | 58885d79 | Iustin Pop | @type test: callable
|
1617 | 58885d79 | Iustin Pop | @param test: a function taking one argument that should return True
|
1618 | 58885d79 | Iustin Pop | if the a given object is valid; the default value is
|
1619 | 58885d79 | Iustin Pop | os.path.exists, causing only existing files to be returned
|
1620 | 58885d79 | Iustin Pop | @rtype: str or None
|
1621 | 58885d79 | Iustin Pop | @return: full path to the object if found, None otherwise
|
1622 | 57c177af | Iustin Pop |
|
1623 | 57c177af | Iustin Pop | """
|
1624 | 57c177af | Iustin Pop | for dir_name in search_path: |
1625 | 57c177af | Iustin Pop | item_name = os.path.sep.join([dir_name, name]) |
1626 | 57c177af | Iustin Pop | if test(item_name):
|
1627 | 57c177af | Iustin Pop | return item_name
|
1628 | 57c177af | Iustin Pop | return None |
1629 | 8d1a2a64 | Michael Hanselmann | |
1630 | 8d1a2a64 | Michael Hanselmann | |
1631 | 8d1a2a64 | Michael Hanselmann | def CheckVolumeGroupSize(vglist, vgname, minsize): |
1632 | 8d1a2a64 | Michael Hanselmann | """Checks if the volume group list is valid.
|
1633 | 8d1a2a64 | Michael Hanselmann |
|
1634 | 58885d79 | Iustin Pop | The function will check if a given volume group is in the list of
|
1635 | 58885d79 | Iustin Pop | volume groups and has a minimum size.
|
1636 | 58885d79 | Iustin Pop |
|
1637 | 58885d79 | Iustin Pop | @type vglist: dict
|
1638 | 58885d79 | Iustin Pop | @param vglist: dictionary of volume group names and their size
|
1639 | 58885d79 | Iustin Pop | @type vgname: str
|
1640 | 58885d79 | Iustin Pop | @param vgname: the volume group we should check
|
1641 | 58885d79 | Iustin Pop | @type minsize: int
|
1642 | 58885d79 | Iustin Pop | @param minsize: the minimum size we accept
|
1643 | 58885d79 | Iustin Pop | @rtype: None or str
|
1644 | 58885d79 | Iustin Pop | @return: None for success, otherwise the error message
|
1645 | 8d1a2a64 | Michael Hanselmann |
|
1646 | 8d1a2a64 | Michael Hanselmann | """
|
1647 | 8d1a2a64 | Michael Hanselmann | vgsize = vglist.get(vgname, None)
|
1648 | 8d1a2a64 | Michael Hanselmann | if vgsize is None: |
1649 | 8d1a2a64 | Michael Hanselmann | return "volume group '%s' missing" % vgname |
1650 | 8d1a2a64 | Michael Hanselmann | elif vgsize < minsize:
|
1651 | 8d1a2a64 | Michael Hanselmann | return ("volume group '%s' too small (%s MiB required, %d MiB found)" % |
1652 | 8d1a2a64 | Michael Hanselmann | (vgname, minsize, vgsize)) |
1653 | 8d1a2a64 | Michael Hanselmann | return None |
1654 | 7996a135 | Iustin Pop | |
1655 | 7996a135 | Iustin Pop | |
1656 | 45bc5e4a | Michael Hanselmann | def SplitTime(value): |
1657 | 739be818 | Michael Hanselmann | """Splits time as floating point number into a tuple.
|
1658 | 739be818 | Michael Hanselmann |
|
1659 | 45bc5e4a | Michael Hanselmann | @param value: Time in seconds
|
1660 | 45bc5e4a | Michael Hanselmann | @type value: int or float
|
1661 | 45bc5e4a | Michael Hanselmann | @return: Tuple containing (seconds, microseconds)
|
1662 | 739be818 | Michael Hanselmann |
|
1663 | 739be818 | Michael Hanselmann | """
|
1664 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = divmod(int(value * 1000000), 1000000) |
1665 | 45bc5e4a | Michael Hanselmann | |
1666 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1667 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
1668 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
1669 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
1670 | 45bc5e4a | Michael Hanselmann | |
1671 | 45bc5e4a | Michael Hanselmann | return (int(seconds), int(microseconds)) |
1672 | 739be818 | Michael Hanselmann | |
1673 | 739be818 | Michael Hanselmann | |
1674 | 739be818 | Michael Hanselmann | def MergeTime(timetuple): |
1675 | 739be818 | Michael Hanselmann | """Merges a tuple into time as a floating point number.
|
1676 | 739be818 | Michael Hanselmann |
|
1677 | 45bc5e4a | Michael Hanselmann | @param timetuple: Time as tuple, (seconds, microseconds)
|
1678 | 739be818 | Michael Hanselmann | @type timetuple: tuple
|
1679 | 739be818 | Michael Hanselmann | @return: Time as a floating point number expressed in seconds
|
1680 | 739be818 | Michael Hanselmann |
|
1681 | 739be818 | Michael Hanselmann | """
|
1682 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = timetuple |
1683 | 739be818 | Michael Hanselmann | |
1684 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1685 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
1686 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
1687 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
1688 | 739be818 | Michael Hanselmann | |
1689 | 45bc5e4a | Michael Hanselmann | return float(seconds) + (float(microseconds) * 0.000001) |
1690 | 739be818 | Michael Hanselmann | |
1691 | 739be818 | Michael Hanselmann | |
1692 | 4a8b186a | Michael Hanselmann | def GetNodeDaemonPort(): |
1693 | 4a8b186a | Michael Hanselmann | """Get the node daemon port for this cluster.
|
1694 | 4a8b186a | Michael Hanselmann |
|
1695 | 4a8b186a | Michael Hanselmann | Note that this routine does not read a ganeti-specific file, but
|
1696 | 58885d79 | Iustin Pop | instead uses C{socket.getservbyname} to allow pre-customization of
|
1697 | 4a8b186a | Michael Hanselmann | this parameter outside of Ganeti.
|
1698 | 4a8b186a | Michael Hanselmann |
|
1699 | 58885d79 | Iustin Pop | @rtype: int
|
1700 | 58885d79 | Iustin Pop |
|
1701 | 4a8b186a | Michael Hanselmann | """
|
1702 | 4a8b186a | Michael Hanselmann | try:
|
1703 | 4a8b186a | Michael Hanselmann | port = socket.getservbyname("ganeti-noded", "tcp") |
1704 | 4a8b186a | Michael Hanselmann | except socket.error:
|
1705 | 4a8b186a | Michael Hanselmann | port = constants.DEFAULT_NODED_PORT |
1706 | 4a8b186a | Michael Hanselmann | |
1707 | 4a8b186a | Michael Hanselmann | return port
|
1708 | 4a8b186a | Michael Hanselmann | |
1709 | 4a8b186a | Michael Hanselmann | |
1710 | d21d09d6 | Iustin Pop | def SetupLogging(logfile, debug=False, stderr_logging=False, program="", |
1711 | d21d09d6 | Iustin Pop | multithreaded=False):
|
1712 | 82d9caef | Iustin Pop | """Configures the logging module.
|
1713 | 82d9caef | Iustin Pop |
|
1714 | 58885d79 | Iustin Pop | @type logfile: str
|
1715 | 58885d79 | Iustin Pop | @param logfile: the filename to which we should log
|
1716 | 58885d79 | Iustin Pop | @type debug: boolean
|
1717 | 58885d79 | Iustin Pop | @param debug: whether to enable debug messages too or
|
1718 | 58885d79 | Iustin Pop | only those at C{INFO} and above level
|
1719 | 58885d79 | Iustin Pop | @type stderr_logging: boolean
|
1720 | 58885d79 | Iustin Pop | @param stderr_logging: whether we should also log to the standard error
|
1721 | 58885d79 | Iustin Pop | @type program: str
|
1722 | 58885d79 | Iustin Pop | @param program: the name under which we should log messages
|
1723 | d21d09d6 | Iustin Pop | @type multithreaded: boolean
|
1724 | d21d09d6 | Iustin Pop | @param multithreaded: if True, will add the thread name to the log file
|
1725 | 58885d79 | Iustin Pop | @raise EnvironmentError: if we can't open the log file and
|
1726 | 58885d79 | Iustin Pop | stderr logging is disabled
|
1727 | 58885d79 | Iustin Pop |
|
1728 | 82d9caef | Iustin Pop | """
|
1729 | d21d09d6 | Iustin Pop | fmt = "%(asctime)s: " + program + " pid=%(process)d" |
1730 | d21d09d6 | Iustin Pop | if multithreaded:
|
1731 | d21d09d6 | Iustin Pop | fmt += "/%(threadName)s"
|
1732 | 82d9caef | Iustin Pop | if debug:
|
1733 | d21d09d6 | Iustin Pop | fmt += " %(module)s:%(lineno)s"
|
1734 | d21d09d6 | Iustin Pop | fmt += " %(levelname)s %(message)s"
|
1735 | 82d9caef | Iustin Pop | formatter = logging.Formatter(fmt) |
1736 | 82d9caef | Iustin Pop | |
1737 | 82d9caef | Iustin Pop | root_logger = logging.getLogger("")
|
1738 | 82d9caef | Iustin Pop | root_logger.setLevel(logging.NOTSET) |
1739 | 82d9caef | Iustin Pop | |
1740 | 6346a9e5 | Michael Hanselmann | # Remove all previously setup handlers
|
1741 | 6346a9e5 | Michael Hanselmann | for handler in root_logger.handlers: |
1742 | 7d88772a | Iustin Pop | handler.close() |
1743 | 6346a9e5 | Michael Hanselmann | root_logger.removeHandler(handler) |
1744 | 6346a9e5 | Michael Hanselmann | |
1745 | 82d9caef | Iustin Pop | if stderr_logging:
|
1746 | 82d9caef | Iustin Pop | stderr_handler = logging.StreamHandler() |
1747 | 82d9caef | Iustin Pop | stderr_handler.setFormatter(formatter) |
1748 | 82d9caef | Iustin Pop | if debug:
|
1749 | 82d9caef | Iustin Pop | stderr_handler.setLevel(logging.NOTSET) |
1750 | 82d9caef | Iustin Pop | else:
|
1751 | 82d9caef | Iustin Pop | stderr_handler.setLevel(logging.CRITICAL) |
1752 | 82d9caef | Iustin Pop | root_logger.addHandler(stderr_handler) |
1753 | 82d9caef | Iustin Pop | |
1754 | 82d9caef | Iustin Pop | # this can fail, if the logging directories are not setup or we have
|
1755 | 82d9caef | Iustin Pop | # a permisssion problem; in this case, it's best to log but ignore
|
1756 | 82d9caef | Iustin Pop | # the error if stderr_logging is True, and if false we re-raise the
|
1757 | 82d9caef | Iustin Pop | # exception since otherwise we could run but without any logs at all
|
1758 | 82d9caef | Iustin Pop | try:
|
1759 | 82d9caef | Iustin Pop | logfile_handler = logging.FileHandler(logfile) |
1760 | 82d9caef | Iustin Pop | logfile_handler.setFormatter(formatter) |
1761 | 82d9caef | Iustin Pop | if debug:
|
1762 | 82d9caef | Iustin Pop | logfile_handler.setLevel(logging.DEBUG) |
1763 | 82d9caef | Iustin Pop | else:
|
1764 | 82d9caef | Iustin Pop | logfile_handler.setLevel(logging.INFO) |
1765 | 82d9caef | Iustin Pop | root_logger.addHandler(logfile_handler) |
1766 | d21d09d6 | Iustin Pop | except EnvironmentError: |
1767 | 82d9caef | Iustin Pop | if stderr_logging:
|
1768 | 82d9caef | Iustin Pop | logging.exception("Failed to enable logging to file '%s'", logfile)
|
1769 | 82d9caef | Iustin Pop | else:
|
1770 | 82d9caef | Iustin Pop | # we need to re-raise the exception
|
1771 | 82d9caef | Iustin Pop | raise
|
1772 | 82d9caef | Iustin Pop | |
1773 | 82d9caef | Iustin Pop | |
1774 | f65f63ef | Iustin Pop | def TailFile(fname, lines=20): |
1775 | f65f63ef | Iustin Pop | """Return the last lines from a file.
|
1776 | f65f63ef | Iustin Pop |
|
1777 | f65f63ef | Iustin Pop | @note: this function will only read and parse the last 4KB of
|
1778 | f65f63ef | Iustin Pop | the file; if the lines are very long, it could be that less
|
1779 | f65f63ef | Iustin Pop | than the requested number of lines are returned
|
1780 | f65f63ef | Iustin Pop |
|
1781 | f65f63ef | Iustin Pop | @param fname: the file name
|
1782 | f65f63ef | Iustin Pop | @type lines: int
|
1783 | f65f63ef | Iustin Pop | @param lines: the (maximum) number of lines to return
|
1784 | f65f63ef | Iustin Pop |
|
1785 | f65f63ef | Iustin Pop | """
|
1786 | f65f63ef | Iustin Pop | fd = open(fname, "r") |
1787 | f65f63ef | Iustin Pop | try:
|
1788 | f65f63ef | Iustin Pop | fd.seek(0, 2) |
1789 | f65f63ef | Iustin Pop | pos = fd.tell() |
1790 | f65f63ef | Iustin Pop | pos = max(0, pos-4096) |
1791 | f65f63ef | Iustin Pop | fd.seek(pos, 0)
|
1792 | f65f63ef | Iustin Pop | raw_data = fd.read() |
1793 | f65f63ef | Iustin Pop | finally:
|
1794 | f65f63ef | Iustin Pop | fd.close() |
1795 | f65f63ef | Iustin Pop | |
1796 | f65f63ef | Iustin Pop | rows = raw_data.splitlines() |
1797 | f65f63ef | Iustin Pop | return rows[-lines:]
|
1798 | f65f63ef | Iustin Pop | |
1799 | f65f63ef | Iustin Pop | |
1800 | 26f15862 | Iustin Pop | def SafeEncode(text): |
1801 | 26f15862 | Iustin Pop | """Return a 'safe' version of a source string.
|
1802 | 26f15862 | Iustin Pop |
|
1803 | 26f15862 | Iustin Pop | This function mangles the input string and returns a version that
|
1804 | 26f15862 | Iustin Pop | should be safe to disply/encode as ASCII. To this end, we first
|
1805 | 26f15862 | Iustin Pop | convert it to ASCII using the 'backslashreplace' encoding which
|
1806 | 26f15862 | Iustin Pop | should get rid of any non-ASCII chars, and then we again encode it
|
1807 | 26f15862 | Iustin Pop | via 'string_escape' which converts '\n' into '\\n' so that log
|
1808 | 26f15862 | Iustin Pop | messages remain one-line.
|
1809 | 26f15862 | Iustin Pop |
|
1810 | 26f15862 | Iustin Pop | @type text: str or unicode
|
1811 | 26f15862 | Iustin Pop | @param text: input data
|
1812 | 26f15862 | Iustin Pop | @rtype: str
|
1813 | 26f15862 | Iustin Pop | @return: a safe version of text
|
1814 | 26f15862 | Iustin Pop |
|
1815 | 26f15862 | Iustin Pop | """
|
1816 | 26f15862 | Iustin Pop | text = text.encode('ascii', 'backslashreplace') |
1817 | 26f15862 | Iustin Pop | text = text.encode('string_escape')
|
1818 | 26f15862 | Iustin Pop | return text
|
1819 | 26f15862 | Iustin Pop | |
1820 | 26f15862 | Iustin Pop | |
1821 | 7996a135 | Iustin Pop | def LockedMethod(fn): |
1822 | 7996a135 | Iustin Pop | """Synchronized object access decorator.
|
1823 | 7996a135 | Iustin Pop |
|
1824 | 7996a135 | Iustin Pop | This decorator is intended to protect access to an object using the
|
1825 | 7996a135 | Iustin Pop | object's own lock which is hardcoded to '_lock'.
|
1826 | 7996a135 | Iustin Pop |
|
1827 | 7996a135 | Iustin Pop | """
|
1828 | e67bd559 | Michael Hanselmann | def _LockDebug(*args, **kwargs): |
1829 | e67bd559 | Michael Hanselmann | if debug_locks:
|
1830 | e67bd559 | Michael Hanselmann | logging.debug(*args, **kwargs) |
1831 | e67bd559 | Michael Hanselmann | |
1832 | 7996a135 | Iustin Pop | def wrapper(self, *args, **kwargs): |
1833 | 7996a135 | Iustin Pop | assert hasattr(self, '_lock') |
1834 | 7996a135 | Iustin Pop | lock = self._lock
|
1835 | e67bd559 | Michael Hanselmann | _LockDebug("Waiting for %s", lock)
|
1836 | 7996a135 | Iustin Pop | lock.acquire() |
1837 | 7996a135 | Iustin Pop | try:
|
1838 | e67bd559 | Michael Hanselmann | _LockDebug("Acquired %s", lock)
|
1839 | 7996a135 | Iustin Pop | result = fn(self, *args, **kwargs)
|
1840 | 7996a135 | Iustin Pop | finally:
|
1841 | e67bd559 | Michael Hanselmann | _LockDebug("Releasing %s", lock)
|
1842 | 7996a135 | Iustin Pop | lock.release() |
1843 | e67bd559 | Michael Hanselmann | _LockDebug("Released %s", lock)
|
1844 | 7996a135 | Iustin Pop | return result
|
1845 | 7996a135 | Iustin Pop | return wrapper
|
1846 | eb0f0ce0 | Michael Hanselmann | |
1847 | eb0f0ce0 | Michael Hanselmann | |
1848 | eb0f0ce0 | Michael Hanselmann | def LockFile(fd): |
1849 | eb0f0ce0 | Michael Hanselmann | """Locks a file using POSIX locks.
|
1850 | eb0f0ce0 | Michael Hanselmann |
|
1851 | 58885d79 | Iustin Pop | @type fd: int
|
1852 | 58885d79 | Iustin Pop | @param fd: the file descriptor we need to lock
|
1853 | 58885d79 | Iustin Pop |
|
1854 | eb0f0ce0 | Michael Hanselmann | """
|
1855 | eb0f0ce0 | Michael Hanselmann | try:
|
1856 | eb0f0ce0 | Michael Hanselmann | fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) |
1857 | eb0f0ce0 | Michael Hanselmann | except IOError, err: |
1858 | eb0f0ce0 | Michael Hanselmann | if err.errno == errno.EAGAIN:
|
1859 | eb0f0ce0 | Michael Hanselmann | raise errors.LockError("File already locked") |
1860 | eb0f0ce0 | Michael Hanselmann | raise
|
1861 | de499029 | Michael Hanselmann | |
1862 | de499029 | Michael Hanselmann | |
1863 | a87b4824 | Michael Hanselmann | class FileLock(object): |
1864 | a87b4824 | Michael Hanselmann | """Utility class for file locks.
|
1865 | a87b4824 | Michael Hanselmann |
|
1866 | a87b4824 | Michael Hanselmann | """
|
1867 | a87b4824 | Michael Hanselmann | def __init__(self, filename): |
1868 | 58885d79 | Iustin Pop | """Constructor for FileLock.
|
1869 | 58885d79 | Iustin Pop |
|
1870 | 58885d79 | Iustin Pop | This will open the file denoted by the I{filename} argument.
|
1871 | 58885d79 | Iustin Pop |
|
1872 | 58885d79 | Iustin Pop | @type filename: str
|
1873 | 58885d79 | Iustin Pop | @param filename: path to the file to be locked
|
1874 | 58885d79 | Iustin Pop |
|
1875 | 58885d79 | Iustin Pop | """
|
1876 | a87b4824 | Michael Hanselmann | self.filename = filename
|
1877 | a87b4824 | Michael Hanselmann | self.fd = open(self.filename, "w") |
1878 | a87b4824 | Michael Hanselmann | |
1879 | a87b4824 | Michael Hanselmann | def __del__(self): |
1880 | a87b4824 | Michael Hanselmann | self.Close()
|
1881 | a87b4824 | Michael Hanselmann | |
1882 | a87b4824 | Michael Hanselmann | def Close(self): |
1883 | 58885d79 | Iustin Pop | """Close the file and release the lock.
|
1884 | 58885d79 | Iustin Pop |
|
1885 | 58885d79 | Iustin Pop | """
|
1886 | a87b4824 | Michael Hanselmann | if self.fd: |
1887 | a87b4824 | Michael Hanselmann | self.fd.close()
|
1888 | a87b4824 | Michael Hanselmann | self.fd = None |
1889 | a87b4824 | Michael Hanselmann | |
1890 | aa74b828 | Michael Hanselmann | def _flock(self, flag, blocking, timeout, errmsg): |
1891 | aa74b828 | Michael Hanselmann | """Wrapper for fcntl.flock.
|
1892 | aa74b828 | Michael Hanselmann |
|
1893 | aa74b828 | Michael Hanselmann | @type flag: int
|
1894 | 58885d79 | Iustin Pop | @param flag: operation flag
|
1895 | aa74b828 | Michael Hanselmann | @type blocking: bool
|
1896 | 58885d79 | Iustin Pop | @param blocking: whether the operation should be done in blocking mode.
|
1897 | aa74b828 | Michael Hanselmann | @type timeout: None or float
|
1898 | 58885d79 | Iustin Pop | @param timeout: for how long the operation should be retried (implies
|
1899 | aa74b828 | Michael Hanselmann | non-blocking mode).
|
1900 | aa74b828 | Michael Hanselmann | @type errmsg: string
|
1901 | 58885d79 | Iustin Pop | @param errmsg: error message in case operation fails.
|
1902 | aa74b828 | Michael Hanselmann |
|
1903 | aa74b828 | Michael Hanselmann | """
|
1904 | a87b4824 | Michael Hanselmann | assert self.fd, "Lock was closed" |
1905 | aa74b828 | Michael Hanselmann | assert timeout is None or timeout >= 0, \ |
1906 | aa74b828 | Michael Hanselmann | "If specified, timeout must be positive"
|
1907 | a87b4824 | Michael Hanselmann | |
1908 | aa74b828 | Michael Hanselmann | if timeout is not None: |
1909 | a87b4824 | Michael Hanselmann | flag |= fcntl.LOCK_NB |
1910 | aa74b828 | Michael Hanselmann | timeout_end = time.time() + timeout |
1911 | a87b4824 | Michael Hanselmann | |
1912 | aa74b828 | Michael Hanselmann | # Blocking doesn't have effect with timeout
|
1913 | aa74b828 | Michael Hanselmann | elif not blocking: |
1914 | aa74b828 | Michael Hanselmann | flag |= fcntl.LOCK_NB |
1915 | aa74b828 | Michael Hanselmann | timeout_end = None
|
1916 | aa74b828 | Michael Hanselmann | |
1917 | aa74b828 | Michael Hanselmann | retry = True
|
1918 | aa74b828 | Michael Hanselmann | while retry:
|
1919 | aa74b828 | Michael Hanselmann | try:
|
1920 | aa74b828 | Michael Hanselmann | fcntl.flock(self.fd, flag)
|
1921 | aa74b828 | Michael Hanselmann | retry = False
|
1922 | aa74b828 | Michael Hanselmann | except IOError, err: |
1923 | aa74b828 | Michael Hanselmann | if err.errno in (errno.EAGAIN, ): |
1924 | aa74b828 | Michael Hanselmann | if timeout_end is not None and time.time() < timeout_end: |
1925 | aa74b828 | Michael Hanselmann | # Wait before trying again
|
1926 | aa74b828 | Michael Hanselmann | time.sleep(max(0.1, min(1.0, timeout))) |
1927 | aa74b828 | Michael Hanselmann | else:
|
1928 | aa74b828 | Michael Hanselmann | raise errors.LockError(errmsg)
|
1929 | aa74b828 | Michael Hanselmann | else:
|
1930 | aa74b828 | Michael Hanselmann | logging.exception("fcntl.flock failed")
|
1931 | aa74b828 | Michael Hanselmann | raise
|
1932 | aa74b828 | Michael Hanselmann | |
1933 | aa74b828 | Michael Hanselmann | def Exclusive(self, blocking=False, timeout=None): |
1934 | a87b4824 | Michael Hanselmann | """Locks the file in exclusive mode.
|
1935 | a87b4824 | Michael Hanselmann |
|
1936 | 58885d79 | Iustin Pop | @type blocking: boolean
|
1937 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
1938 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
1939 | 58885d79 | Iustin Pop | @type timeout: int or None
|
1940 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
1941 | 58885d79 | Iustin Pop | (in blocking mode)
|
1942 | 58885d79 | Iustin Pop |
|
1943 | a87b4824 | Michael Hanselmann | """
|
1944 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_EX, blocking, timeout,
|
1945 | a87b4824 | Michael Hanselmann | "Failed to lock %s in exclusive mode" % self.filename) |
1946 | a87b4824 | Michael Hanselmann | |
1947 | aa74b828 | Michael Hanselmann | def Shared(self, blocking=False, timeout=None): |
1948 | a87b4824 | Michael Hanselmann | """Locks the file in shared mode.
|
1949 | a87b4824 | Michael Hanselmann |
|
1950 | 58885d79 | Iustin Pop | @type blocking: boolean
|
1951 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
1952 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
1953 | 58885d79 | Iustin Pop | @type timeout: int or None
|
1954 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
1955 | 58885d79 | Iustin Pop | (in blocking mode)
|
1956 | 58885d79 | Iustin Pop |
|
1957 | a87b4824 | Michael Hanselmann | """
|
1958 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_SH, blocking, timeout,
|
1959 | a87b4824 | Michael Hanselmann | "Failed to lock %s in shared mode" % self.filename) |
1960 | a87b4824 | Michael Hanselmann | |
1961 | aa74b828 | Michael Hanselmann | def Unlock(self, blocking=True, timeout=None): |
1962 | a87b4824 | Michael Hanselmann | """Unlocks the file.
|
1963 | a87b4824 | Michael Hanselmann |
|
1964 | 58885d79 | Iustin Pop | According to C{flock(2)}, unlocking can also be a nonblocking
|
1965 | 58885d79 | Iustin Pop | operation::
|
1966 | 58885d79 | Iustin Pop |
|
1967 | 58885d79 | Iustin Pop | To make a non-blocking request, include LOCK_NB with any of the above
|
1968 | 58885d79 | Iustin Pop | operations.
|
1969 | 58885d79 | Iustin Pop |
|
1970 | 58885d79 | Iustin Pop | @type blocking: boolean
|
1971 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
1972 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
1973 | 58885d79 | Iustin Pop | @type timeout: int or None
|
1974 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
1975 | 58885d79 | Iustin Pop | (in blocking mode)
|
1976 | a87b4824 | Michael Hanselmann |
|
1977 | a87b4824 | Michael Hanselmann | """
|
1978 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_UN, blocking, timeout,
|
1979 | a87b4824 | Michael Hanselmann | "Failed to unlock %s" % self.filename) |
1980 | a87b4824 | Michael Hanselmann | |
1981 | a87b4824 | Michael Hanselmann | |
1982 | de499029 | Michael Hanselmann | class SignalHandler(object): |
1983 | de499029 | Michael Hanselmann | """Generic signal handler class.
|
1984 | de499029 | Michael Hanselmann |
|
1985 | 58885d79 | Iustin Pop | It automatically restores the original handler when deconstructed or
|
1986 | 58885d79 | Iustin Pop | when L{Reset} is called. You can either pass your own handler
|
1987 | 58885d79 | Iustin Pop | function in or query the L{called} attribute to detect whether the
|
1988 | 58885d79 | Iustin Pop | signal was sent.
|
1989 | 58885d79 | Iustin Pop |
|
1990 | 58885d79 | Iustin Pop | @type signum: list
|
1991 | 58885d79 | Iustin Pop | @ivar signum: the signals we handle
|
1992 | 58885d79 | Iustin Pop | @type called: boolean
|
1993 | 58885d79 | Iustin Pop | @ivar called: tracks whether any of the signals have been raised
|
1994 | de499029 | Michael Hanselmann |
|
1995 | de499029 | Michael Hanselmann | """
|
1996 | de499029 | Michael Hanselmann | def __init__(self, signum): |
1997 | de499029 | Michael Hanselmann | """Constructs a new SignalHandler instance.
|
1998 | de499029 | Michael Hanselmann |
|
1999 | 58885d79 | Iustin Pop | @type signum: int or list of ints
|
2000 | de499029 | Michael Hanselmann | @param signum: Single signal number or set of signal numbers
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2001 | de499029 | Michael Hanselmann |
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2002 | de499029 | Michael Hanselmann | """
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2003 | de499029 | Michael Hanselmann | if isinstance(signum, (int, long)): |
2004 | de499029 | Michael Hanselmann | self.signum = set([signum]) |
2005 | de499029 | Michael Hanselmann | else:
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2006 | de499029 | Michael Hanselmann | self.signum = set(signum) |
2007 | de499029 | Michael Hanselmann | |
2008 | de499029 | Michael Hanselmann | self.called = False |
2009 | de499029 | Michael Hanselmann | |
2010 | de499029 | Michael Hanselmann | self._previous = {}
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2011 | de499029 | Michael Hanselmann | try:
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2012 | de499029 | Michael Hanselmann | for signum in self.signum: |
2013 | de499029 | Michael Hanselmann | # Setup handler
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2014 | de499029 | Michael Hanselmann | prev_handler = signal.signal(signum, self._HandleSignal)
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2015 | de499029 | Michael Hanselmann | try:
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2016 | de499029 | Michael Hanselmann | self._previous[signum] = prev_handler
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2017 | de499029 | Michael Hanselmann | except:
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2018 | de499029 | Michael Hanselmann | # Restore previous handler
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2019 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
2020 | de499029 | Michael Hanselmann | raise
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2021 | de499029 | Michael Hanselmann | except:
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2022 | de499029 | Michael Hanselmann | # Reset all handlers
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2023 | de499029 | Michael Hanselmann | self.Reset()
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2024 | de499029 | Michael Hanselmann | # Here we have a race condition: a handler may have already been called,
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2025 | de499029 | Michael Hanselmann | # but there's not much we can do about it at this point.
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2026 | de499029 | Michael Hanselmann | raise
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2027 | de499029 | Michael Hanselmann | |
2028 | de499029 | Michael Hanselmann | def __del__(self): |
2029 | de499029 | Michael Hanselmann | self.Reset()
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2030 | de499029 | Michael Hanselmann | |
2031 | de499029 | Michael Hanselmann | def Reset(self): |
2032 | de499029 | Michael Hanselmann | """Restore previous handler.
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2033 | de499029 | Michael Hanselmann |
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2034 | 58885d79 | Iustin Pop | This will reset all the signals to their previous handlers.
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2035 | 58885d79 | Iustin Pop |
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2036 | de499029 | Michael Hanselmann | """
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2037 | de499029 | Michael Hanselmann | for signum, prev_handler in self._previous.items(): |
2038 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
2039 | de499029 | Michael Hanselmann | # If successful, remove from dict
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2040 | de499029 | Michael Hanselmann | del self._previous[signum] |
2041 | de499029 | Michael Hanselmann | |
2042 | de499029 | Michael Hanselmann | def Clear(self): |
2043 | 58885d79 | Iustin Pop | """Unsets the L{called} flag.
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2044 | de499029 | Michael Hanselmann |
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2045 | de499029 | Michael Hanselmann | This function can be used in case a signal may arrive several times.
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2046 | de499029 | Michael Hanselmann |
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2047 | de499029 | Michael Hanselmann | """
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2048 | de499029 | Michael Hanselmann | self.called = False |
2049 | de499029 | Michael Hanselmann | |
2050 | de499029 | Michael Hanselmann | def _HandleSignal(self, signum, frame): |
2051 | de499029 | Michael Hanselmann | """Actual signal handling function.
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2052 | de499029 | Michael Hanselmann |
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2053 | de499029 | Michael Hanselmann | """
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2054 | de499029 | Michael Hanselmann | # This is not nice and not absolutely atomic, but it appears to be the only
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2055 | de499029 | Michael Hanselmann | # solution in Python -- there are no atomic types.
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2056 | de499029 | Michael Hanselmann | self.called = True |
2057 | a2d2e1a7 | Iustin Pop | |
2058 | a2d2e1a7 | Iustin Pop | |
2059 | a2d2e1a7 | Iustin Pop | class FieldSet(object): |
2060 | a2d2e1a7 | Iustin Pop | """A simple field set.
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2061 | a2d2e1a7 | Iustin Pop |
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2062 | a2d2e1a7 | Iustin Pop | Among the features are:
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2063 | a2d2e1a7 | Iustin Pop | - checking if a string is among a list of static string or regex objects
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2064 | a2d2e1a7 | Iustin Pop | - checking if a whole list of string matches
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2065 | a2d2e1a7 | Iustin Pop | - returning the matching groups from a regex match
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2066 | a2d2e1a7 | Iustin Pop |
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2067 | a2d2e1a7 | Iustin Pop | Internally, all fields are held as regular expression objects.
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2068 | a2d2e1a7 | Iustin Pop |
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2069 | a2d2e1a7 | Iustin Pop | """
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2070 | a2d2e1a7 | Iustin Pop | def __init__(self, *items): |
2071 | a2d2e1a7 | Iustin Pop | self.items = [re.compile("^%s$" % value) for value in items] |
2072 | a2d2e1a7 | Iustin Pop | |
2073 | a2d2e1a7 | Iustin Pop | def Extend(self, other_set): |
2074 | a2d2e1a7 | Iustin Pop | """Extend the field set with the items from another one"""
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2075 | a2d2e1a7 | Iustin Pop | self.items.extend(other_set.items)
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2076 | a2d2e1a7 | Iustin Pop | |
2077 | a2d2e1a7 | Iustin Pop | def Matches(self, field): |
2078 | a2d2e1a7 | Iustin Pop | """Checks if a field matches the current set
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2079 | a2d2e1a7 | Iustin Pop |
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2080 | a2d2e1a7 | Iustin Pop | @type field: str
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2081 | a2d2e1a7 | Iustin Pop | @param field: the string to match
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2082 | a2d2e1a7 | Iustin Pop | @return: either False or a regular expression match object
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2083 | a2d2e1a7 | Iustin Pop |
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2084 | a2d2e1a7 | Iustin Pop | """
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2085 | a2d2e1a7 | Iustin Pop | for m in itertools.ifilter(None, (val.match(field) for val in self.items)): |
2086 | a2d2e1a7 | Iustin Pop | return m
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2087 | a2d2e1a7 | Iustin Pop | return False |
2088 | a2d2e1a7 | Iustin Pop | |
2089 | a2d2e1a7 | Iustin Pop | def NonMatching(self, items): |
2090 | a2d2e1a7 | Iustin Pop | """Returns the list of fields not matching the current set
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2091 | a2d2e1a7 | Iustin Pop |
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2092 | a2d2e1a7 | Iustin Pop | @type items: list
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2093 | a2d2e1a7 | Iustin Pop | @param items: the list of fields to check
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2094 | a2d2e1a7 | Iustin Pop | @rtype: list
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2095 | a2d2e1a7 | Iustin Pop | @return: list of non-matching fields
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2096 | a2d2e1a7 | Iustin Pop |
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2097 | a2d2e1a7 | Iustin Pop | """
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2098 | a2d2e1a7 | Iustin Pop | return [val for val in items if not self.Matches(val)] |