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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 | 8797df43 | Iustin Pop | def _RunCmdPipe(cmd, env, via_shell, cwd): |
170 | 36117c2b | Iustin Pop | """Run a command and return its output.
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171 | 36117c2b | Iustin Pop |
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172 | 36117c2b | Iustin Pop | @type cmd: string or list
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173 | 36117c2b | Iustin Pop | @param cmd: Command to run
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174 | 36117c2b | Iustin Pop | @type env: dict
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175 | 36117c2b | Iustin Pop | @param env: The environment to use
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176 | 36117c2b | Iustin Pop | @type via_shell: bool
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177 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
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178 | 8797df43 | Iustin Pop | @type cwd: string
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179 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
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180 | 36117c2b | Iustin Pop | @rtype: tuple
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181 | 36117c2b | Iustin Pop | @return: (out, err, status)
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182 | 36117c2b | Iustin Pop |
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183 | 36117c2b | Iustin Pop | """
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184 | 9c233417 | Iustin Pop | poller = select.poll() |
185 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
186 | 113b55aa | Iustin Pop | stderr=subprocess.PIPE, |
187 | 113b55aa | Iustin Pop | stdout=subprocess.PIPE, |
188 | 113b55aa | Iustin Pop | stdin=subprocess.PIPE, |
189 | 8797df43 | Iustin Pop | close_fds=True, env=env,
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190 | 8797df43 | Iustin Pop | cwd=cwd) |
191 | 113b55aa | Iustin Pop | |
192 | 113b55aa | Iustin Pop | child.stdin.close() |
193 | 9c233417 | Iustin Pop | poller.register(child.stdout, select.POLLIN) |
194 | 9c233417 | Iustin Pop | poller.register(child.stderr, select.POLLIN) |
195 | 9c233417 | Iustin Pop | out = StringIO() |
196 | 9c233417 | Iustin Pop | err = StringIO() |
197 | 9c233417 | Iustin Pop | fdmap = { |
198 | 9c233417 | Iustin Pop | child.stdout.fileno(): (out, child.stdout), |
199 | 9c233417 | Iustin Pop | child.stderr.fileno(): (err, child.stderr), |
200 | 9c233417 | Iustin Pop | } |
201 | 9c233417 | Iustin Pop | for fd in fdmap: |
202 | 9c233417 | Iustin Pop | status = fcntl.fcntl(fd, fcntl.F_GETFL) |
203 | 9c233417 | Iustin Pop | fcntl.fcntl(fd, fcntl.F_SETFL, status | os.O_NONBLOCK) |
204 | 9c233417 | Iustin Pop | |
205 | 9c233417 | Iustin Pop | while fdmap:
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206 | 9c233417 | Iustin Pop | for fd, event in poller.poll(): |
207 | 9c233417 | Iustin Pop | if event & select.POLLIN or event & select.POLLPRI: |
208 | 9c233417 | Iustin Pop | data = fdmap[fd][1].read()
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209 | 9c233417 | Iustin Pop | # no data from read signifies EOF (the same as POLLHUP)
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210 | 9c233417 | Iustin Pop | if not data: |
211 | 9c233417 | Iustin Pop | poller.unregister(fd) |
212 | 9c233417 | Iustin Pop | del fdmap[fd]
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213 | 9c233417 | Iustin Pop | continue
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214 | 9c233417 | Iustin Pop | fdmap[fd][0].write(data)
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215 | 9c233417 | Iustin Pop | if (event & select.POLLNVAL or event & select.POLLHUP or |
216 | 9c233417 | Iustin Pop | event & select.POLLERR): |
217 | 9c233417 | Iustin Pop | poller.unregister(fd) |
218 | 9c233417 | Iustin Pop | del fdmap[fd]
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219 | 9c233417 | Iustin Pop | |
220 | 9c233417 | Iustin Pop | out = out.getvalue() |
221 | 9c233417 | Iustin Pop | err = err.getvalue() |
222 | a8083063 | Iustin Pop | |
223 | a8083063 | Iustin Pop | status = child.wait() |
224 | 36117c2b | Iustin Pop | return out, err, status
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225 | a8083063 | Iustin Pop | |
226 | 36117c2b | Iustin Pop | |
227 | 8797df43 | Iustin Pop | def _RunCmdFile(cmd, env, via_shell, output, cwd): |
228 | 36117c2b | Iustin Pop | """Run a command and save its output to a file.
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229 | 36117c2b | Iustin Pop |
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230 | 36117c2b | Iustin Pop | @type cmd: string or list
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231 | 36117c2b | Iustin Pop | @param cmd: Command to run
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232 | 36117c2b | Iustin Pop | @type env: dict
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233 | 36117c2b | Iustin Pop | @param env: The environment to use
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234 | 36117c2b | Iustin Pop | @type via_shell: bool
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235 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
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236 | 36117c2b | Iustin Pop | @type output: str
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237 | 36117c2b | Iustin Pop | @param output: the filename in which to save the output
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238 | 8797df43 | Iustin Pop | @type cwd: string
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239 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
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240 | 36117c2b | Iustin Pop | @rtype: int
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241 | 36117c2b | Iustin Pop | @return: the exit status
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242 | 36117c2b | Iustin Pop |
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243 | 36117c2b | Iustin Pop | """
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244 | 36117c2b | Iustin Pop | fh = open(output, "a") |
245 | 36117c2b | Iustin Pop | try:
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246 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
247 | 36117c2b | Iustin Pop | stderr=subprocess.STDOUT, |
248 | 36117c2b | Iustin Pop | stdout=fh, |
249 | 36117c2b | Iustin Pop | stdin=subprocess.PIPE, |
250 | 8797df43 | Iustin Pop | close_fds=True, env=env,
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251 | 8797df43 | Iustin Pop | cwd=cwd) |
252 | 36117c2b | Iustin Pop | |
253 | 36117c2b | Iustin Pop | child.stdin.close() |
254 | 36117c2b | Iustin Pop | status = child.wait() |
255 | 36117c2b | Iustin Pop | finally:
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256 | 36117c2b | Iustin Pop | fh.close() |
257 | 36117c2b | Iustin Pop | return status
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258 | a8083063 | Iustin Pop | |
259 | a8083063 | Iustin Pop | |
260 | a8083063 | Iustin Pop | def RemoveFile(filename): |
261 | a8083063 | Iustin Pop | """Remove a file ignoring some errors.
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262 | a8083063 | Iustin Pop |
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263 | a8083063 | Iustin Pop | Remove a file, ignoring non-existing ones or directories. Other
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264 | a8083063 | Iustin Pop | errors are passed.
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265 | a8083063 | Iustin Pop |
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266 | 58885d79 | Iustin Pop | @type filename: str
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267 | 58885d79 | Iustin Pop | @param filename: the file to be removed
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268 | 58885d79 | Iustin Pop |
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269 | a8083063 | Iustin Pop | """
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270 | a8083063 | Iustin Pop | try:
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271 | a8083063 | Iustin Pop | os.unlink(filename) |
272 | a8083063 | Iustin Pop | except OSError, err: |
273 | 4ca1b175 | Alexander Schreiber | if err.errno not in (errno.ENOENT, errno.EISDIR): |
274 | a8083063 | Iustin Pop | raise
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275 | a8083063 | Iustin Pop | |
276 | a8083063 | Iustin Pop | |
277 | a8083063 | Iustin Pop | def _FingerprintFile(filename): |
278 | a8083063 | Iustin Pop | """Compute the fingerprint of a file.
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279 | a8083063 | Iustin Pop |
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280 | a8083063 | Iustin Pop | If the file does not exist, a None will be returned
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281 | a8083063 | Iustin Pop | instead.
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282 | a8083063 | Iustin Pop |
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283 | 58885d79 | Iustin Pop | @type filename: str
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284 | 58885d79 | Iustin Pop | @param filename: the filename to checksum
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285 | 58885d79 | Iustin Pop | @rtype: str
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286 | 58885d79 | Iustin Pop | @return: the hex digest of the sha checksum of the contents
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287 | 58885d79 | Iustin Pop | of the file
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288 | a8083063 | Iustin Pop |
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289 | a8083063 | Iustin Pop | """
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290 | a8083063 | Iustin Pop | if not (os.path.exists(filename) and os.path.isfile(filename)): |
291 | a8083063 | Iustin Pop | return None |
292 | a8083063 | Iustin Pop | |
293 | a8083063 | Iustin Pop | f = open(filename)
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294 | a8083063 | Iustin Pop | |
295 | a8083063 | Iustin Pop | fp = sha.sha() |
296 | a8083063 | Iustin Pop | while True: |
297 | a8083063 | Iustin Pop | data = f.read(4096)
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298 | a8083063 | Iustin Pop | if not data: |
299 | a8083063 | Iustin Pop | break
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300 | a8083063 | Iustin Pop | |
301 | a8083063 | Iustin Pop | fp.update(data) |
302 | a8083063 | Iustin Pop | |
303 | a8083063 | Iustin Pop | return fp.hexdigest()
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304 | a8083063 | Iustin Pop | |
305 | a8083063 | Iustin Pop | |
306 | a8083063 | Iustin Pop | def FingerprintFiles(files): |
307 | a8083063 | Iustin Pop | """Compute fingerprints for a list of files.
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308 | a8083063 | Iustin Pop |
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309 | 58885d79 | Iustin Pop | @type files: list
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310 | 58885d79 | Iustin Pop | @param files: the list of filename to fingerprint
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311 | 58885d79 | Iustin Pop | @rtype: dict
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312 | 58885d79 | Iustin Pop | @return: a dictionary filename: fingerprint, holding only
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313 | 58885d79 | Iustin Pop | existing files
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314 | a8083063 | Iustin Pop |
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315 | a8083063 | Iustin Pop | """
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316 | a8083063 | Iustin Pop | ret = {} |
317 | a8083063 | Iustin Pop | |
318 | a8083063 | Iustin Pop | for filename in files: |
319 | a8083063 | Iustin Pop | cksum = _FingerprintFile(filename) |
320 | a8083063 | Iustin Pop | if cksum:
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321 | a8083063 | Iustin Pop | ret[filename] = cksum |
322 | a8083063 | Iustin Pop | |
323 | a8083063 | Iustin Pop | return ret
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324 | a8083063 | Iustin Pop | |
325 | a8083063 | Iustin Pop | |
326 | a8083063 | Iustin Pop | def CheckDict(target, template, logname=None): |
327 | a8083063 | Iustin Pop | """Ensure a dictionary has a required set of keys.
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328 | a8083063 | Iustin Pop |
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329 | 58885d79 | Iustin Pop | For the given dictionaries I{target} and I{template}, ensure
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330 | 58885d79 | Iustin Pop | I{target} has all the keys from I{template}. Missing keys are added
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331 | 58885d79 | Iustin Pop | with values from template.
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332 | a8083063 | Iustin Pop |
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333 | 58885d79 | Iustin Pop | @type target: dict
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334 | 58885d79 | Iustin Pop | @param target: the dictionary to update
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335 | 58885d79 | Iustin Pop | @type template: dict
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336 | 58885d79 | Iustin Pop | @param template: the dictionary holding the default values
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337 | 58885d79 | Iustin Pop | @type logname: str or None
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338 | 58885d79 | Iustin Pop | @param logname: if not None, causes the missing keys to be
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339 | 58885d79 | Iustin Pop | logged with this name
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340 | a8083063 | Iustin Pop |
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341 | a8083063 | Iustin Pop | """
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342 | a8083063 | Iustin Pop | missing = [] |
343 | a8083063 | Iustin Pop | for k in template: |
344 | a8083063 | Iustin Pop | if k not in target: |
345 | a8083063 | Iustin Pop | missing.append(k) |
346 | a8083063 | Iustin Pop | target[k] = template[k] |
347 | a8083063 | Iustin Pop | |
348 | a8083063 | Iustin Pop | if missing and logname: |
349 | bb698c1f | Iustin Pop | logging.warning('%s missing keys %s', logname, ', '.join(missing)) |
350 | a8083063 | Iustin Pop | |
351 | a8083063 | Iustin Pop | |
352 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
353 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
|
354 | a8083063 | Iustin Pop |
|
355 | 44bf25ff | Iustin Pop | @note: zombie status is not handled, so zombie processes
|
356 | 44bf25ff | Iustin Pop | will be returned as alive
|
357 | 58885d79 | Iustin Pop | @type pid: int
|
358 | 58885d79 | Iustin Pop | @param pid: the process ID to check
|
359 | 58885d79 | Iustin Pop | @rtype: boolean
|
360 | 58885d79 | Iustin Pop | @return: True if the process exists
|
361 | a8083063 | Iustin Pop |
|
362 | a8083063 | Iustin Pop | """
|
363 | d9f311d7 | Iustin Pop | if pid <= 0: |
364 | d9f311d7 | Iustin Pop | return False |
365 | d9f311d7 | Iustin Pop | |
366 | a8083063 | Iustin Pop | try:
|
367 | 44bf25ff | Iustin Pop | os.stat("/proc/%d/status" % pid)
|
368 | 44bf25ff | Iustin Pop | return True |
369 | 44bf25ff | Iustin Pop | except EnvironmentError, err: |
370 | 4ca1b175 | Alexander Schreiber | if err.errno in (errno.ENOENT, errno.ENOTDIR): |
371 | a8083063 | Iustin Pop | return False |
372 | 44bf25ff | Iustin Pop | raise
|
373 | a8083063 | Iustin Pop | |
374 | a8083063 | Iustin Pop | |
375 | d9f311d7 | Iustin Pop | def ReadPidFile(pidfile): |
376 | 58885d79 | Iustin Pop | """Read a pid from a file.
|
377 | fee80e90 | Guido Trotter |
|
378 | 58885d79 | Iustin Pop | @type pidfile: string
|
379 | 58885d79 | Iustin Pop | @param pidfile: path to the file containing the pid
|
380 | 58885d79 | Iustin Pop | @rtype: int
|
381 | d9f311d7 | Iustin Pop | @return: The process id, if the file exista and contains a valid PID,
|
382 | d9f311d7 | Iustin Pop | otherwise 0
|
383 | fee80e90 | Guido Trotter |
|
384 | fee80e90 | Guido Trotter | """
|
385 | fee80e90 | Guido Trotter | try:
|
386 | fee80e90 | Guido Trotter | pf = open(pidfile, 'r') |
387 | d9f311d7 | Iustin Pop | except EnvironmentError, err: |
388 | d9f311d7 | Iustin Pop | if err.errno != errno.ENOENT:
|
389 | d9f311d7 | Iustin Pop | logging.exception("Can't read pid file?!")
|
390 | d9f311d7 | Iustin Pop | return 0 |
391 | fee80e90 | Guido Trotter | |
392 | fee80e90 | Guido Trotter | try:
|
393 | fee80e90 | Guido Trotter | pid = int(pf.read())
|
394 | d9f311d7 | Iustin Pop | except ValueError, err: |
395 | 8161a646 | Iustin Pop | logging.info("Can't parse pid file contents", exc_info=True) |
396 | d9f311d7 | Iustin Pop | return 0 |
397 | fee80e90 | Guido Trotter | |
398 | d9f311d7 | Iustin Pop | return pid
|
399 | fee80e90 | Guido Trotter | |
400 | fee80e90 | Guido Trotter | |
401 | a8083063 | Iustin Pop | def MatchNameComponent(key, name_list): |
402 | a8083063 | Iustin Pop | """Try to match a name against a list.
|
403 | a8083063 | Iustin Pop |
|
404 | a8083063 | Iustin Pop | This function will try to match a name like test1 against a list
|
405 | 58885d79 | Iustin Pop | like C{['test1.example.com', 'test2.example.com', ...]}. Against
|
406 | 58885d79 | Iustin Pop | this list, I{'test1'} as well as I{'test1.example'} will match, but
|
407 | 58885d79 | Iustin Pop | not I{'test1.ex'}. A multiple match will be considered as no match
|
408 | 58885d79 | Iustin Pop | at all (e.g. I{'test1'} against C{['test1.example.com',
|
409 | 58885d79 | Iustin Pop | 'test1.example.org']}).
|
410 | a8083063 | Iustin Pop |
|
411 | 58885d79 | Iustin Pop | @type key: str
|
412 | 58885d79 | Iustin Pop | @param key: the name to be searched
|
413 | 58885d79 | Iustin Pop | @type name_list: list
|
414 | 58885d79 | Iustin Pop | @param name_list: the list of strings against which to search the key
|
415 | a8083063 | Iustin Pop |
|
416 | 58885d79 | Iustin Pop | @rtype: None or str
|
417 | 58885d79 | Iustin Pop | @return: None if there is no match I{or} if there are multiple matches,
|
418 | 58885d79 | Iustin Pop | otherwise the element from the list which matches
|
419 | a8083063 | Iustin Pop |
|
420 | a8083063 | Iustin Pop | """
|
421 | a8083063 | Iustin Pop | mo = re.compile("^%s(\..*)?$" % re.escape(key))
|
422 | a8083063 | Iustin Pop | names_filtered = [name for name in name_list if mo.match(name) is not None] |
423 | a8083063 | Iustin Pop | if len(names_filtered) != 1: |
424 | a8083063 | Iustin Pop | return None |
425 | a8083063 | Iustin Pop | return names_filtered[0] |
426 | a8083063 | Iustin Pop | |
427 | a8083063 | Iustin Pop | |
428 | bcf043c9 | Iustin Pop | class HostInfo: |
429 | 89e1fc26 | Iustin Pop | """Class implementing resolver and hostname functionality
|
430 | bcf043c9 | Iustin Pop |
|
431 | bcf043c9 | Iustin Pop | """
|
432 | 89e1fc26 | Iustin Pop | def __init__(self, name=None): |
433 | bcf043c9 | Iustin Pop | """Initialize the host name object.
|
434 | bcf043c9 | Iustin Pop |
|
435 | 89e1fc26 | Iustin Pop | If the name argument is not passed, it will use this system's
|
436 | 89e1fc26 | Iustin Pop | name.
|
437 | bcf043c9 | Iustin Pop |
|
438 | bcf043c9 | Iustin Pop | """
|
439 | 89e1fc26 | Iustin Pop | if name is None: |
440 | 89e1fc26 | Iustin Pop | name = self.SysName()
|
441 | 89e1fc26 | Iustin Pop | |
442 | 89e1fc26 | Iustin Pop | self.query = name
|
443 | 89e1fc26 | Iustin Pop | self.name, self.aliases, self.ipaddrs = self.LookupHostname(name) |
444 | bcf043c9 | Iustin Pop | self.ip = self.ipaddrs[0] |
445 | bcf043c9 | Iustin Pop | |
446 | c8a0948f | Michael Hanselmann | def ShortName(self): |
447 | c8a0948f | Michael Hanselmann | """Returns the hostname without domain.
|
448 | c8a0948f | Michael Hanselmann |
|
449 | c8a0948f | Michael Hanselmann | """
|
450 | c8a0948f | Michael Hanselmann | return self.name.split('.')[0] |
451 | c8a0948f | Michael Hanselmann | |
452 | 89e1fc26 | Iustin Pop | @staticmethod
|
453 | 89e1fc26 | Iustin Pop | def SysName(): |
454 | 89e1fc26 | Iustin Pop | """Return the current system's name.
|
455 | bcf043c9 | Iustin Pop |
|
456 | 58885d79 | Iustin Pop | This is simply a wrapper over C{socket.gethostname()}.
|
457 | a8083063 | Iustin Pop |
|
458 | 89e1fc26 | Iustin Pop | """
|
459 | 89e1fc26 | Iustin Pop | return socket.gethostname()
|
460 | a8083063 | Iustin Pop | |
461 | 89e1fc26 | Iustin Pop | @staticmethod
|
462 | 89e1fc26 | Iustin Pop | def LookupHostname(hostname): |
463 | 89e1fc26 | Iustin Pop | """Look up hostname
|
464 | a8083063 | Iustin Pop |
|
465 | 58885d79 | Iustin Pop | @type hostname: str
|
466 | 58885d79 | Iustin Pop | @param hostname: hostname to look up
|
467 | 89e1fc26 | Iustin Pop |
|
468 | 58885d79 | Iustin Pop | @rtype: tuple
|
469 | 58885d79 | Iustin Pop | @return: a tuple (name, aliases, ipaddrs) as returned by
|
470 | 58885d79 | Iustin Pop | C{socket.gethostbyname_ex}
|
471 | 58885d79 | Iustin Pop | @raise errors.ResolverError: in case of errors in resolving
|
472 | 89e1fc26 | Iustin Pop |
|
473 | 89e1fc26 | Iustin Pop | """
|
474 | 89e1fc26 | Iustin Pop | try:
|
475 | 89e1fc26 | Iustin Pop | result = socket.gethostbyname_ex(hostname) |
476 | 89e1fc26 | Iustin Pop | except socket.gaierror, err:
|
477 | 89e1fc26 | Iustin Pop | # hostname not found in DNS
|
478 | 89e1fc26 | Iustin Pop | raise errors.ResolverError(hostname, err.args[0], err.args[1]) |
479 | a8083063 | Iustin Pop | |
480 | 89e1fc26 | Iustin Pop | return result
|
481 | a8083063 | Iustin Pop | |
482 | a8083063 | Iustin Pop | |
483 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
484 | a8083063 | Iustin Pop | """List volume groups and their size
|
485 | a8083063 | Iustin Pop |
|
486 | 58885d79 | Iustin Pop | @rtype: dict
|
487 | 58885d79 | Iustin Pop | @return:
|
488 | 58885d79 | Iustin Pop | Dictionary with keys volume name and values
|
489 | 58885d79 | Iustin Pop | the size of the volume
|
490 | a8083063 | Iustin Pop |
|
491 | a8083063 | Iustin Pop | """
|
492 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
493 | a8083063 | Iustin Pop | result = RunCmd(command) |
494 | a8083063 | Iustin Pop | retval = {} |
495 | a8083063 | Iustin Pop | if result.failed:
|
496 | a8083063 | Iustin Pop | return retval
|
497 | a8083063 | Iustin Pop | |
498 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
499 | a8083063 | Iustin Pop | try:
|
500 | a8083063 | Iustin Pop | name, size = line.split() |
501 | a8083063 | Iustin Pop | size = int(float(size)) |
502 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
503 | bb698c1f | Iustin Pop | logging.error("Invalid output from vgs (%s): %s", err, line)
|
504 | a8083063 | Iustin Pop | continue
|
505 | a8083063 | Iustin Pop | |
506 | a8083063 | Iustin Pop | retval[name] = size |
507 | a8083063 | Iustin Pop | |
508 | a8083063 | Iustin Pop | return retval
|
509 | a8083063 | Iustin Pop | |
510 | a8083063 | Iustin Pop | |
511 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
512 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
513 | a8083063 | Iustin Pop |
|
514 | 58885d79 | Iustin Pop | @type bridge: str
|
515 | 58885d79 | Iustin Pop | @param bridge: the bridge name to check
|
516 | 58885d79 | Iustin Pop | @rtype: boolean
|
517 | 58885d79 | Iustin Pop | @return: True if it does
|
518 | a8083063 | Iustin Pop |
|
519 | a8083063 | Iustin Pop | """
|
520 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
521 | a8083063 | Iustin Pop | |
522 | a8083063 | Iustin Pop | |
523 | 42ce2e13 | Guido Trotter | def CheckBEParams(beparams): |
524 | 42ce2e13 | Guido Trotter | """Checks whether the user-supplied be-params are valid,
|
525 | 42ce2e13 | Guido Trotter | and converts them from string format where appropriate.
|
526 | 42ce2e13 | Guido Trotter |
|
527 | 42ce2e13 | Guido Trotter | @type beparams: dict
|
528 | 42ce2e13 | Guido Trotter | @param beparams: new params dict
|
529 | 42ce2e13 | Guido Trotter |
|
530 | 42ce2e13 | Guido Trotter | """
|
531 | 42ce2e13 | Guido Trotter | if beparams:
|
532 | 42ce2e13 | Guido Trotter | for item in beparams: |
533 | 42ce2e13 | Guido Trotter | if item not in constants.BES_PARAMETERS: |
534 | 42ce2e13 | Guido Trotter | raise errors.OpPrereqError("Unknown backend parameter %s" % item) |
535 | 42ce2e13 | Guido Trotter | if item in (constants.BE_MEMORY, constants.BE_VCPUS): |
536 | 42ce2e13 | Guido Trotter | val = beparams[item] |
537 | 42ce2e13 | Guido Trotter | if val != constants.VALUE_DEFAULT:
|
538 | 42ce2e13 | Guido Trotter | try:
|
539 | 42ce2e13 | Guido Trotter | val = int(val)
|
540 | 42ce2e13 | Guido Trotter | except ValueError, err: |
541 | 42ce2e13 | Guido Trotter | raise errors.OpPrereqError("Invalid %s size: %s" % (item, str(err))) |
542 | 42ce2e13 | Guido Trotter | beparams[item] = val |
543 | 42ce2e13 | Guido Trotter | if item in (constants.BE_AUTO_BALANCE): |
544 | 42ce2e13 | Guido Trotter | val = beparams[item] |
545 | 90eb468c | Guido Trotter | if not isinstance(val, bool): |
546 | 90eb468c | Guido Trotter | if val == constants.VALUE_TRUE:
|
547 | 90eb468c | Guido Trotter | beparams[item] = True
|
548 | 90eb468c | Guido Trotter | elif val == constants.VALUE_FALSE:
|
549 | 90eb468c | Guido Trotter | beparams[item] = False
|
550 | 90eb468c | Guido Trotter | else:
|
551 | 90eb468c | Guido Trotter | raise errors.OpPrereqError("Invalid %s value: %s" % (item, val)) |
552 | 42ce2e13 | Guido Trotter | |
553 | 42ce2e13 | Guido Trotter | |
554 | a8083063 | Iustin Pop | def NiceSort(name_list): |
555 | a8083063 | Iustin Pop | """Sort a list of strings based on digit and non-digit groupings.
|
556 | a8083063 | Iustin Pop |
|
557 | 58885d79 | Iustin Pop | Given a list of names C{['a1', 'a10', 'a11', 'a2']} this function
|
558 | 58885d79 | Iustin Pop | will sort the list in the logical order C{['a1', 'a2', 'a10',
|
559 | 58885d79 | Iustin Pop | 'a11']}.
|
560 | a8083063 | Iustin Pop |
|
561 | a8083063 | Iustin Pop | The sort algorithm breaks each name in groups of either only-digits
|
562 | a8083063 | Iustin Pop | or no-digits. Only the first eight such groups are considered, and
|
563 | a8083063 | Iustin Pop | after that we just use what's left of the string.
|
564 | a8083063 | Iustin Pop |
|
565 | 58885d79 | Iustin Pop | @type name_list: list
|
566 | 58885d79 | Iustin Pop | @param name_list: the names to be sorted
|
567 | 58885d79 | Iustin Pop | @rtype: list
|
568 | 58885d79 | Iustin Pop | @return: a copy of the name list sorted with our algorithm
|
569 | a8083063 | Iustin Pop |
|
570 | a8083063 | Iustin Pop | """
|
571 | a8083063 | Iustin Pop | _SORTER_BASE = "(\D+|\d+)"
|
572 | a8083063 | Iustin Pop | _SORTER_FULL = "^%s%s?%s?%s?%s?%s?%s?%s?.*$" % (_SORTER_BASE, _SORTER_BASE,
|
573 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
574 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
575 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE) |
576 | a8083063 | Iustin Pop | _SORTER_RE = re.compile(_SORTER_FULL) |
577 | a8083063 | Iustin Pop | _SORTER_NODIGIT = re.compile("^\D*$")
|
578 | a8083063 | Iustin Pop | def _TryInt(val): |
579 | a8083063 | Iustin Pop | """Attempts to convert a variable to integer."""
|
580 | a8083063 | Iustin Pop | if val is None or _SORTER_NODIGIT.match(val): |
581 | a8083063 | Iustin Pop | return val
|
582 | a8083063 | Iustin Pop | rval = int(val)
|
583 | a8083063 | Iustin Pop | return rval
|
584 | a8083063 | Iustin Pop | |
585 | a8083063 | Iustin Pop | to_sort = [([_TryInt(grp) for grp in _SORTER_RE.match(name).groups()], name) |
586 | a8083063 | Iustin Pop | for name in name_list] |
587 | a8083063 | Iustin Pop | to_sort.sort() |
588 | a8083063 | Iustin Pop | return [tup[1] for tup in to_sort] |
589 | a8083063 | Iustin Pop | |
590 | a8083063 | Iustin Pop | |
591 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
592 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
593 | a8083063 | Iustin Pop |
|
594 | 58885d79 | Iustin Pop | This function tries to apply function I{fn} to I{val}. If no
|
595 | 58885d79 | Iustin Pop | C{ValueError} or C{TypeError} exceptions are raised, it will return
|
596 | 58885d79 | Iustin Pop | the result, else it will return the original value. Any other
|
597 | 58885d79 | Iustin Pop | exceptions are propagated to the caller.
|
598 | 58885d79 | Iustin Pop |
|
599 | 58885d79 | Iustin Pop | @type fn: callable
|
600 | 58885d79 | Iustin Pop | @param fn: function to apply to the value
|
601 | 58885d79 | Iustin Pop | @param val: the value to be converted
|
602 | 58885d79 | Iustin Pop | @return: The converted value if the conversion was successful,
|
603 | 58885d79 | Iustin Pop | otherwise the original value.
|
604 | a8083063 | Iustin Pop |
|
605 | a8083063 | Iustin Pop | """
|
606 | a8083063 | Iustin Pop | try:
|
607 | a8083063 | Iustin Pop | nv = fn(val) |
608 | a8083063 | Iustin Pop | except (ValueError, TypeError), err: |
609 | a8083063 | Iustin Pop | nv = val |
610 | a8083063 | Iustin Pop | return nv
|
611 | a8083063 | Iustin Pop | |
612 | a8083063 | Iustin Pop | |
613 | a8083063 | Iustin Pop | def IsValidIP(ip): |
614 | 58885d79 | Iustin Pop | """Verifies the syntax of an IPv4 address.
|
615 | a8083063 | Iustin Pop |
|
616 | 58885d79 | Iustin Pop | This function checks if the IPv4 address passes is valid or not based
|
617 | 58885d79 | Iustin Pop | on syntax (not IP range, class calculations, etc.).
|
618 | 58885d79 | Iustin Pop |
|
619 | 58885d79 | Iustin Pop | @type ip: str
|
620 | 58885d79 | Iustin Pop | @param ip: the address to be checked
|
621 | 58885d79 | Iustin Pop | @rtype: a regular expression match object
|
622 | 58885d79 | Iustin Pop | @return: a regular epression match object, or None if the
|
623 | 58885d79 | Iustin Pop | address is not valid
|
624 | a8083063 | Iustin Pop |
|
625 | a8083063 | Iustin Pop | """
|
626 | a8083063 | Iustin Pop | unit = "(0|[1-9]\d{0,2})"
|
627 | 58885d79 | Iustin Pop | #TODO: convert and return only boolean
|
628 | a8083063 | Iustin Pop | return re.match("^%s\.%s\.%s\.%s$" % (unit, unit, unit, unit), ip) |
629 | a8083063 | Iustin Pop | |
630 | a8083063 | Iustin Pop | |
631 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
632 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
633 | a8083063 | Iustin Pop |
|
634 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
635 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
636 | a8083063 | Iustin Pop | the actual command.
|
637 | a8083063 | Iustin Pop |
|
638 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
639 | a8083063 | Iustin Pop | side.
|
640 | a8083063 | Iustin Pop |
|
641 | 58885d79 | Iustin Pop | @type word: str
|
642 | 58885d79 | Iustin Pop | @param word: the word to check
|
643 | 58885d79 | Iustin Pop | @rtype: boolean
|
644 | 58885d79 | Iustin Pop | @return: True if the word is 'safe'
|
645 | 58885d79 | Iustin Pop |
|
646 | a8083063 | Iustin Pop | """
|
647 | a8083063 | Iustin Pop | return bool(re.match("^[-a-zA-Z0-9._+/:%@]+$", word)) |
648 | a8083063 | Iustin Pop | |
649 | a8083063 | Iustin Pop | |
650 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
651 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
652 | a8083063 | Iustin Pop |
|
653 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
654 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
655 | a8083063 | Iustin Pop | metacharaters). If everything is ok, it will return the result of
|
656 | a8083063 | Iustin Pop | template % args.
|
657 | a8083063 | Iustin Pop |
|
658 | 58885d79 | Iustin Pop | @type template: str
|
659 | 58885d79 | Iustin Pop | @param template: the string holding the template for the
|
660 | 58885d79 | Iustin Pop | string formatting
|
661 | 58885d79 | Iustin Pop | @rtype: str
|
662 | 58885d79 | Iustin Pop | @return: the expanded command line
|
663 | 58885d79 | Iustin Pop |
|
664 | a8083063 | Iustin Pop | """
|
665 | a8083063 | Iustin Pop | for word in args: |
666 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
667 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
668 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
669 | a8083063 | Iustin Pop | return template % args
|
670 | a8083063 | Iustin Pop | |
671 | a8083063 | Iustin Pop | |
672 | 9fbfbb7b | Iustin Pop | def FormatUnit(value, units): |
673 | a8083063 | Iustin Pop | """Formats an incoming number of MiB with the appropriate unit.
|
674 | a8083063 | Iustin Pop |
|
675 | 58885d79 | Iustin Pop | @type value: int
|
676 | 58885d79 | Iustin Pop | @param value: integer representing the value in MiB (1048576)
|
677 | 9fbfbb7b | Iustin Pop | @type units: char
|
678 | 9fbfbb7b | Iustin Pop | @param units: the type of formatting we should do:
|
679 | 9fbfbb7b | Iustin Pop | - 'h' for automatic scaling
|
680 | 9fbfbb7b | Iustin Pop | - 'm' for MiBs
|
681 | 9fbfbb7b | Iustin Pop | - 'g' for GiBs
|
682 | 9fbfbb7b | Iustin Pop | - 't' for TiBs
|
683 | 58885d79 | Iustin Pop | @rtype: str
|
684 | 58885d79 | Iustin Pop | @return: the formatted value (with suffix)
|
685 | a8083063 | Iustin Pop |
|
686 | a8083063 | Iustin Pop | """
|
687 | 9fbfbb7b | Iustin Pop | if units not in ('m', 'g', 't', 'h'): |
688 | 9fbfbb7b | Iustin Pop | raise errors.ProgrammerError("Invalid unit specified '%s'" % str(units)) |
689 | a8083063 | Iustin Pop | |
690 | 9fbfbb7b | Iustin Pop | suffix = ''
|
691 | 9fbfbb7b | Iustin Pop | |
692 | 9fbfbb7b | Iustin Pop | if units == 'm' or (units == 'h' and value < 1024): |
693 | 9fbfbb7b | Iustin Pop | if units == 'h': |
694 | 9fbfbb7b | Iustin Pop | suffix = 'M'
|
695 | 9fbfbb7b | Iustin Pop | return "%d%s" % (round(value, 0), suffix) |
696 | 9fbfbb7b | Iustin Pop | |
697 | 9fbfbb7b | Iustin Pop | elif units == 'g' or (units == 'h' and value < (1024 * 1024)): |
698 | 9fbfbb7b | Iustin Pop | if units == 'h': |
699 | 9fbfbb7b | Iustin Pop | suffix = 'G'
|
700 | 9fbfbb7b | Iustin Pop | return "%0.1f%s" % (round(float(value) / 1024, 1), suffix) |
701 | a8083063 | Iustin Pop | |
702 | a8083063 | Iustin Pop | else:
|
703 | 9fbfbb7b | Iustin Pop | if units == 'h': |
704 | 9fbfbb7b | Iustin Pop | suffix = 'T'
|
705 | 9fbfbb7b | Iustin Pop | return "%0.1f%s" % (round(float(value) / 1024 / 1024, 1), suffix) |
706 | a8083063 | Iustin Pop | |
707 | a8083063 | Iustin Pop | |
708 | a8083063 | Iustin Pop | def ParseUnit(input_string): |
709 | a8083063 | Iustin Pop | """Tries to extract number and scale from the given string.
|
710 | a8083063 | Iustin Pop |
|
711 | 58885d79 | Iustin Pop | Input must be in the format C{NUMBER+ [DOT NUMBER+] SPACE*
|
712 | 58885d79 | Iustin Pop | [UNIT]}. If no unit is specified, it defaults to MiB. Return value
|
713 | 58885d79 | Iustin Pop | is always an int in MiB.
|
714 | a8083063 | Iustin Pop |
|
715 | a8083063 | Iustin Pop | """
|
716 | a8083063 | Iustin Pop | m = re.match('^([.\d]+)\s*([a-zA-Z]+)?$', input_string)
|
717 | a8083063 | Iustin Pop | if not m: |
718 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Invalid format") |
719 | a8083063 | Iustin Pop | |
720 | a8083063 | Iustin Pop | value = float(m.groups()[0]) |
721 | a8083063 | Iustin Pop | |
722 | a8083063 | Iustin Pop | unit = m.groups()[1]
|
723 | a8083063 | Iustin Pop | if unit:
|
724 | a8083063 | Iustin Pop | lcunit = unit.lower() |
725 | a8083063 | Iustin Pop | else:
|
726 | a8083063 | Iustin Pop | lcunit = 'm'
|
727 | a8083063 | Iustin Pop | |
728 | a8083063 | Iustin Pop | if lcunit in ('m', 'mb', 'mib'): |
729 | a8083063 | Iustin Pop | # Value already in MiB
|
730 | a8083063 | Iustin Pop | pass
|
731 | a8083063 | Iustin Pop | |
732 | a8083063 | Iustin Pop | elif lcunit in ('g', 'gb', 'gib'): |
733 | a8083063 | Iustin Pop | value *= 1024
|
734 | a8083063 | Iustin Pop | |
735 | a8083063 | Iustin Pop | elif lcunit in ('t', 'tb', 'tib'): |
736 | a8083063 | Iustin Pop | value *= 1024 * 1024 |
737 | a8083063 | Iustin Pop | |
738 | a8083063 | Iustin Pop | else:
|
739 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Unknown unit: %s" % unit) |
740 | a8083063 | Iustin Pop | |
741 | a8083063 | Iustin Pop | # Make sure we round up
|
742 | a8083063 | Iustin Pop | if int(value) < value: |
743 | a8083063 | Iustin Pop | value += 1
|
744 | a8083063 | Iustin Pop | |
745 | a8083063 | Iustin Pop | # Round up to the next multiple of 4
|
746 | a8083063 | Iustin Pop | value = int(value)
|
747 | a8083063 | Iustin Pop | if value % 4: |
748 | a8083063 | Iustin Pop | value += 4 - value % 4 |
749 | a8083063 | Iustin Pop | |
750 | a8083063 | Iustin Pop | return value
|
751 | a8083063 | Iustin Pop | |
752 | a8083063 | Iustin Pop | |
753 | a8083063 | Iustin Pop | def AddAuthorizedKey(file_name, key): |
754 | a8083063 | Iustin Pop | """Adds an SSH public key to an authorized_keys file.
|
755 | a8083063 | Iustin Pop |
|
756 | 58885d79 | Iustin Pop | @type file_name: str
|
757 | 58885d79 | Iustin Pop | @param file_name: path to authorized_keys file
|
758 | 58885d79 | Iustin Pop | @type key: str
|
759 | 58885d79 | Iustin Pop | @param key: string containing key
|
760 | 58885d79 | Iustin Pop |
|
761 | a8083063 | Iustin Pop | """
|
762 | a8083063 | Iustin Pop | key_fields = key.split() |
763 | a8083063 | Iustin Pop | |
764 | a8083063 | Iustin Pop | f = open(file_name, 'a+') |
765 | a8083063 | Iustin Pop | try:
|
766 | a8083063 | Iustin Pop | nl = True
|
767 | a8083063 | Iustin Pop | for line in f: |
768 | a8083063 | Iustin Pop | # Ignore whitespace changes
|
769 | a8083063 | Iustin Pop | if line.split() == key_fields:
|
770 | a8083063 | Iustin Pop | break
|
771 | a8083063 | Iustin Pop | nl = line.endswith('\n')
|
772 | a8083063 | Iustin Pop | else:
|
773 | a8083063 | Iustin Pop | if not nl: |
774 | a8083063 | Iustin Pop | f.write("\n")
|
775 | a8083063 | Iustin Pop | f.write(key.rstrip('\r\n'))
|
776 | a8083063 | Iustin Pop | f.write("\n")
|
777 | a8083063 | Iustin Pop | f.flush() |
778 | a8083063 | Iustin Pop | finally:
|
779 | a8083063 | Iustin Pop | f.close() |
780 | a8083063 | Iustin Pop | |
781 | a8083063 | Iustin Pop | |
782 | a8083063 | Iustin Pop | def RemoveAuthorizedKey(file_name, key): |
783 | a8083063 | Iustin Pop | """Removes an SSH public key from an authorized_keys file.
|
784 | a8083063 | Iustin Pop |
|
785 | 58885d79 | Iustin Pop | @type file_name: str
|
786 | 58885d79 | Iustin Pop | @param file_name: path to authorized_keys file
|
787 | 58885d79 | Iustin Pop | @type key: str
|
788 | 58885d79 | Iustin Pop | @param key: string containing key
|
789 | 58885d79 | Iustin Pop |
|
790 | a8083063 | Iustin Pop | """
|
791 | a8083063 | Iustin Pop | key_fields = key.split() |
792 | a8083063 | Iustin Pop | |
793 | a8083063 | Iustin Pop | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
794 | a8083063 | Iustin Pop | try:
|
795 | 59f82e3f | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
796 | a8083063 | Iustin Pop | try:
|
797 | 59f82e3f | Michael Hanselmann | f = open(file_name, 'r') |
798 | 59f82e3f | Michael Hanselmann | try:
|
799 | 59f82e3f | Michael Hanselmann | for line in f: |
800 | 59f82e3f | Michael Hanselmann | # Ignore whitespace changes while comparing lines
|
801 | 59f82e3f | Michael Hanselmann | if line.split() != key_fields:
|
802 | 59f82e3f | Michael Hanselmann | out.write(line) |
803 | 899d2a81 | Michael Hanselmann | |
804 | 899d2a81 | Michael Hanselmann | out.flush() |
805 | 899d2a81 | Michael Hanselmann | os.rename(tmpname, file_name) |
806 | 899d2a81 | Michael Hanselmann | finally:
|
807 | 899d2a81 | Michael Hanselmann | f.close() |
808 | 899d2a81 | Michael Hanselmann | finally:
|
809 | 899d2a81 | Michael Hanselmann | out.close() |
810 | 899d2a81 | Michael Hanselmann | except:
|
811 | 899d2a81 | Michael Hanselmann | RemoveFile(tmpname) |
812 | 899d2a81 | Michael Hanselmann | raise
|
813 | 899d2a81 | Michael Hanselmann | |
814 | 899d2a81 | Michael Hanselmann | |
815 | 9440aeab | Michael Hanselmann | def SetEtcHostsEntry(file_name, ip, hostname, aliases): |
816 | 9440aeab | Michael Hanselmann | """Sets the name of an IP address and hostname in /etc/hosts.
|
817 | 899d2a81 | Michael Hanselmann |
|
818 | 58885d79 | Iustin Pop | @type file_name: str
|
819 | 58885d79 | Iustin Pop | @param file_name: path to the file to modify (usually C{/etc/hosts})
|
820 | 58885d79 | Iustin Pop | @type ip: str
|
821 | 58885d79 | Iustin Pop | @param ip: the IP address
|
822 | 58885d79 | Iustin Pop | @type hostname: str
|
823 | 58885d79 | Iustin Pop | @param hostname: the hostname to be added
|
824 | 58885d79 | Iustin Pop | @type aliases: list
|
825 | 58885d79 | Iustin Pop | @param aliases: the list of aliases to add for the hostname
|
826 | 58885d79 | Iustin Pop |
|
827 | 899d2a81 | Michael Hanselmann | """
|
828 | 7fbb1f65 | Michael Hanselmann | # Ensure aliases are unique
|
829 | 7fbb1f65 | Michael Hanselmann | aliases = UniqueSequence([hostname] + aliases)[1:]
|
830 | 7fbb1f65 | Michael Hanselmann | |
831 | 9440aeab | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
832 | 899d2a81 | Michael Hanselmann | try:
|
833 | 9440aeab | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
834 | 9440aeab | Michael Hanselmann | try:
|
835 | 9440aeab | Michael Hanselmann | f = open(file_name, 'r') |
836 | 9440aeab | Michael Hanselmann | try:
|
837 | 9440aeab | Michael Hanselmann | written = False
|
838 | 9440aeab | Michael Hanselmann | for line in f: |
839 | 9440aeab | Michael Hanselmann | fields = line.split() |
840 | 7e3dbb94 | Iustin Pop | if fields and not fields[0].startswith('#') and ip == fields[0]: |
841 | 9440aeab | Michael Hanselmann | continue
|
842 | 9440aeab | Michael Hanselmann | out.write(line) |
843 | 9440aeab | Michael Hanselmann | |
844 | 7e3dbb94 | Iustin Pop | out.write("%s\t%s" % (ip, hostname))
|
845 | 9440aeab | Michael Hanselmann | if aliases:
|
846 | 9440aeab | Michael Hanselmann | out.write(" %s" % ' '.join(aliases)) |
847 | 9440aeab | Michael Hanselmann | out.write('\n')
|
848 | 9440aeab | Michael Hanselmann | |
849 | 9440aeab | Michael Hanselmann | out.flush() |
850 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
851 | 9440aeab | Michael Hanselmann | os.rename(tmpname, file_name) |
852 | 9440aeab | Michael Hanselmann | finally:
|
853 | 9440aeab | Michael Hanselmann | f.close() |
854 | 9440aeab | Michael Hanselmann | finally:
|
855 | 9440aeab | Michael Hanselmann | out.close() |
856 | 9440aeab | Michael Hanselmann | except:
|
857 | 9440aeab | Michael Hanselmann | RemoveFile(tmpname) |
858 | 9440aeab | Michael Hanselmann | raise
|
859 | 899d2a81 | Michael Hanselmann | |
860 | 899d2a81 | Michael Hanselmann | |
861 | d9c02ca6 | Michael Hanselmann | def AddHostToEtcHosts(hostname): |
862 | d9c02ca6 | Michael Hanselmann | """Wrapper around SetEtcHostsEntry.
|
863 | d9c02ca6 | Michael Hanselmann |
|
864 | 58885d79 | Iustin Pop | @type hostname: str
|
865 | 58885d79 | Iustin Pop | @param hostname: a hostname that will be resolved and added to
|
866 | 58885d79 | Iustin Pop | L{constants.ETC_HOSTS}
|
867 | 58885d79 | Iustin Pop |
|
868 | d9c02ca6 | Michael Hanselmann | """
|
869 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
870 | d9c02ca6 | Michael Hanselmann | SetEtcHostsEntry(constants.ETC_HOSTS, hi.ip, hi.name, [hi.ShortName()]) |
871 | d9c02ca6 | Michael Hanselmann | |
872 | d9c02ca6 | Michael Hanselmann | |
873 | 899d2a81 | Michael Hanselmann | def RemoveEtcHostsEntry(file_name, hostname): |
874 | 3e1cdf9f | Michael Hanselmann | """Removes a hostname from /etc/hosts.
|
875 | 899d2a81 | Michael Hanselmann |
|
876 | 9440aeab | Michael Hanselmann | IP addresses without names are removed from the file.
|
877 | 58885d79 | Iustin Pop |
|
878 | 58885d79 | Iustin Pop | @type file_name: str
|
879 | 58885d79 | Iustin Pop | @param file_name: path to the file to modify (usually C{/etc/hosts})
|
880 | 58885d79 | Iustin Pop | @type hostname: str
|
881 | 58885d79 | Iustin Pop | @param hostname: the hostname to be removed
|
882 | 58885d79 | Iustin Pop |
|
883 | 899d2a81 | Michael Hanselmann | """
|
884 | 899d2a81 | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
885 | 899d2a81 | Michael Hanselmann | try:
|
886 | 899d2a81 | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
887 | 899d2a81 | Michael Hanselmann | try:
|
888 | 899d2a81 | Michael Hanselmann | f = open(file_name, 'r') |
889 | 899d2a81 | Michael Hanselmann | try:
|
890 | 899d2a81 | Michael Hanselmann | for line in f: |
891 | 899d2a81 | Michael Hanselmann | fields = line.split() |
892 | 899d2a81 | Michael Hanselmann | if len(fields) > 1 and not fields[0].startswith('#'): |
893 | 899d2a81 | Michael Hanselmann | names = fields[1:]
|
894 | 899d2a81 | Michael Hanselmann | if hostname in names: |
895 | 899d2a81 | Michael Hanselmann | while hostname in names: |
896 | 899d2a81 | Michael Hanselmann | names.remove(hostname) |
897 | 899d2a81 | Michael Hanselmann | if names:
|
898 | 9440aeab | Michael Hanselmann | out.write("%s %s\n" % (fields[0], ' '.join(names))) |
899 | 899d2a81 | Michael Hanselmann | continue
|
900 | 899d2a81 | Michael Hanselmann | |
901 | 899d2a81 | Michael Hanselmann | out.write(line) |
902 | 59f82e3f | Michael Hanselmann | |
903 | 59f82e3f | Michael Hanselmann | out.flush() |
904 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
905 | 59f82e3f | Michael Hanselmann | os.rename(tmpname, file_name) |
906 | 59f82e3f | Michael Hanselmann | finally:
|
907 | 59f82e3f | Michael Hanselmann | f.close() |
908 | a8083063 | Iustin Pop | finally:
|
909 | 59f82e3f | Michael Hanselmann | out.close() |
910 | 59f82e3f | Michael Hanselmann | except:
|
911 | 59f82e3f | Michael Hanselmann | RemoveFile(tmpname) |
912 | 59f82e3f | Michael Hanselmann | raise
|
913 | a8083063 | Iustin Pop | |
914 | a8083063 | Iustin Pop | |
915 | d9c02ca6 | Michael Hanselmann | def RemoveHostFromEtcHosts(hostname): |
916 | d9c02ca6 | Michael Hanselmann | """Wrapper around RemoveEtcHostsEntry.
|
917 | d9c02ca6 | Michael Hanselmann |
|
918 | 58885d79 | Iustin Pop | @type hostname: str
|
919 | 58885d79 | Iustin Pop | @param hostname: hostname that will be resolved and its
|
920 | 58885d79 | Iustin Pop | full and shot name will be removed from
|
921 | 58885d79 | Iustin Pop | L{constants.ETC_HOSTS}
|
922 | 58885d79 | Iustin Pop |
|
923 | d9c02ca6 | Michael Hanselmann | """
|
924 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
925 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.name) |
926 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.ShortName()) |
927 | d9c02ca6 | Michael Hanselmann | |
928 | d9c02ca6 | Michael Hanselmann | |
929 | a8083063 | Iustin Pop | def CreateBackup(file_name): |
930 | a8083063 | Iustin Pop | """Creates a backup of a file.
|
931 | a8083063 | Iustin Pop |
|
932 | 58885d79 | Iustin Pop | @type file_name: str
|
933 | 58885d79 | Iustin Pop | @param file_name: file to be backed up
|
934 | 58885d79 | Iustin Pop | @rtype: str
|
935 | 58885d79 | Iustin Pop | @return: the path to the newly created backup
|
936 | 58885d79 | Iustin Pop | @raise errors.ProgrammerError: for invalid file names
|
937 | a8083063 | Iustin Pop |
|
938 | a8083063 | Iustin Pop | """
|
939 | a8083063 | Iustin Pop | if not os.path.isfile(file_name): |
940 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Can't make a backup of a non-file '%s'" % |
941 | 3ecf6786 | Iustin Pop | file_name) |
942 | a8083063 | Iustin Pop | |
943 | 081b1e69 | Michael Hanselmann | prefix = '%s.backup-%d.' % (os.path.basename(file_name), int(time.time())) |
944 | 65fe4693 | Iustin Pop | dir_name = os.path.dirname(file_name) |
945 | 081b1e69 | Michael Hanselmann | |
946 | 081b1e69 | Michael Hanselmann | fsrc = open(file_name, 'rb') |
947 | 081b1e69 | Michael Hanselmann | try:
|
948 | 65fe4693 | Iustin Pop | (fd, backup_name) = tempfile.mkstemp(prefix=prefix, dir=dir_name) |
949 | 081b1e69 | Michael Hanselmann | fdst = os.fdopen(fd, 'wb')
|
950 | 081b1e69 | Michael Hanselmann | try:
|
951 | 081b1e69 | Michael Hanselmann | shutil.copyfileobj(fsrc, fdst) |
952 | 081b1e69 | Michael Hanselmann | finally:
|
953 | 081b1e69 | Michael Hanselmann | fdst.close() |
954 | 081b1e69 | Michael Hanselmann | finally:
|
955 | 081b1e69 | Michael Hanselmann | fsrc.close() |
956 | 081b1e69 | Michael Hanselmann | |
957 | a8083063 | Iustin Pop | return backup_name
|
958 | a8083063 | Iustin Pop | |
959 | a8083063 | Iustin Pop | |
960 | a8083063 | Iustin Pop | def ShellQuote(value): |
961 | a8083063 | Iustin Pop | """Quotes shell argument according to POSIX.
|
962 | 3ecf6786 | Iustin Pop |
|
963 | 58885d79 | Iustin Pop | @type value: str
|
964 | 58885d79 | Iustin Pop | @param value: the argument to be quoted
|
965 | 58885d79 | Iustin Pop | @rtype: str
|
966 | 58885d79 | Iustin Pop | @return: the quoted value
|
967 | 58885d79 | Iustin Pop |
|
968 | a8083063 | Iustin Pop | """
|
969 | a8083063 | Iustin Pop | if _re_shell_unquoted.match(value):
|
970 | a8083063 | Iustin Pop | return value
|
971 | a8083063 | Iustin Pop | else:
|
972 | a8083063 | Iustin Pop | return "'%s'" % value.replace("'", "'\\''") |
973 | a8083063 | Iustin Pop | |
974 | a8083063 | Iustin Pop | |
975 | a8083063 | Iustin Pop | def ShellQuoteArgs(args): |
976 | 58885d79 | Iustin Pop | """Quotes a list of shell arguments.
|
977 | 58885d79 | Iustin Pop |
|
978 | 58885d79 | Iustin Pop | @type args: list
|
979 | 58885d79 | Iustin Pop | @param args: list of arguments to be quoted
|
980 | 58885d79 | Iustin Pop | @rtype: str
|
981 | 58885d79 | Iustin Pop | @return: the quoted arguments concatenaned with spaces
|
982 | a8083063 | Iustin Pop |
|
983 | a8083063 | Iustin Pop | """
|
984 | a8083063 | Iustin Pop | return ' '.join([ShellQuote(i) for i in args]) |
985 | 88d14415 | Michael Hanselmann | |
986 | 88d14415 | Michael Hanselmann | |
987 | b15d625f | Iustin Pop | def TcpPing(target, port, timeout=10, live_port_needed=False, source=None): |
988 | 2c30e9d7 | Alexander Schreiber | """Simple ping implementation using TCP connect(2).
|
989 | 2c30e9d7 | Alexander Schreiber |
|
990 | 58885d79 | Iustin Pop | Check if the given IP is reachable by doing attempting a TCP connect
|
991 | 58885d79 | Iustin Pop | to it.
|
992 | 58885d79 | Iustin Pop |
|
993 | 58885d79 | Iustin Pop | @type target: str
|
994 | 58885d79 | Iustin Pop | @param target: the IP or hostname to ping
|
995 | 58885d79 | Iustin Pop | @type port: int
|
996 | 58885d79 | Iustin Pop | @param port: the port to connect to
|
997 | 58885d79 | Iustin Pop | @type timeout: int
|
998 | 58885d79 | Iustin Pop | @param timeout: the timeout on the connection attemp
|
999 | 58885d79 | Iustin Pop | @type live_port_needed: boolean
|
1000 | 58885d79 | Iustin Pop | @param live_port_needed: whether a closed port will cause the
|
1001 | 58885d79 | Iustin Pop | function to return failure, as if there was a timeout
|
1002 | 58885d79 | Iustin Pop | @type source: str or None
|
1003 | 58885d79 | Iustin Pop | @param source: if specified, will cause the connect to be made
|
1004 | 58885d79 | Iustin Pop | from this specific source address; failures to bind other
|
1005 | 58885d79 | Iustin Pop | than C{EADDRNOTAVAIL} will be ignored
|
1006 | 2c30e9d7 | Alexander Schreiber |
|
1007 | 2c30e9d7 | Alexander Schreiber | """
|
1008 | 2c30e9d7 | Alexander Schreiber | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
1009 | 2c30e9d7 | Alexander Schreiber | |
1010 | 2c30e9d7 | Alexander Schreiber | sucess = False
|
1011 | 2c30e9d7 | Alexander Schreiber | |
1012 | b15d625f | Iustin Pop | if source is not None: |
1013 | b15d625f | Iustin Pop | try:
|
1014 | b15d625f | Iustin Pop | sock.bind((source, 0))
|
1015 | b15d625f | Iustin Pop | except socket.error, (errcode, errstring):
|
1016 | b15d625f | Iustin Pop | if errcode == errno.EADDRNOTAVAIL:
|
1017 | b15d625f | Iustin Pop | success = False
|
1018 | 2c30e9d7 | Alexander Schreiber | |
1019 | 2c30e9d7 | Alexander Schreiber | sock.settimeout(timeout) |
1020 | 2c30e9d7 | Alexander Schreiber | |
1021 | 2c30e9d7 | Alexander Schreiber | try:
|
1022 | 2c30e9d7 | Alexander Schreiber | sock.connect((target, port)) |
1023 | 2c30e9d7 | Alexander Schreiber | sock.close() |
1024 | 2c30e9d7 | Alexander Schreiber | success = True
|
1025 | 2c30e9d7 | Alexander Schreiber | except socket.timeout:
|
1026 | 2c30e9d7 | Alexander Schreiber | success = False
|
1027 | 2c30e9d7 | Alexander Schreiber | except socket.error, (errcode, errstring):
|
1028 | 4ca1b175 | Alexander Schreiber | success = (not live_port_needed) and (errcode == errno.ECONNREFUSED) |
1029 | 2c30e9d7 | Alexander Schreiber | |
1030 | 2c30e9d7 | Alexander Schreiber | return success
|
1031 | eedbda4b | Michael Hanselmann | |
1032 | eedbda4b | Michael Hanselmann | |
1033 | caad16e2 | Iustin Pop | def OwnIpAddress(address): |
1034 | caad16e2 | Iustin Pop | """Check if the current host has the the given IP address.
|
1035 | caad16e2 | Iustin Pop |
|
1036 | 58885d79 | Iustin Pop | Currently this is done by TCP-pinging the address from the loopback
|
1037 | caad16e2 | Iustin Pop | address.
|
1038 | caad16e2 | Iustin Pop |
|
1039 | caad16e2 | Iustin Pop | @type address: string
|
1040 | caad16e2 | Iustin Pop | @param address: the addres to check
|
1041 | caad16e2 | Iustin Pop | @rtype: bool
|
1042 | 58885d79 | Iustin Pop | @return: True if we own the address
|
1043 | caad16e2 | Iustin Pop |
|
1044 | caad16e2 | Iustin Pop | """
|
1045 | caad16e2 | Iustin Pop | return TcpPing(address, constants.DEFAULT_NODED_PORT,
|
1046 | caad16e2 | Iustin Pop | source=constants.LOCALHOST_IP_ADDRESS) |
1047 | caad16e2 | Iustin Pop | |
1048 | caad16e2 | Iustin Pop | |
1049 | eedbda4b | Michael Hanselmann | def ListVisibleFiles(path): |
1050 | 58885d79 | Iustin Pop | """Returns a list of visible files in a directory.
|
1051 | 58885d79 | Iustin Pop |
|
1052 | 58885d79 | Iustin Pop | @type path: str
|
1053 | 58885d79 | Iustin Pop | @param path: the directory to enumerate
|
1054 | 58885d79 | Iustin Pop | @rtype: list
|
1055 | 58885d79 | Iustin Pop | @return: the list of all files not starting with a dot
|
1056 | eedbda4b | Michael Hanselmann |
|
1057 | eedbda4b | Michael Hanselmann | """
|
1058 | f3299a07 | Michael Hanselmann | files = [i for i in os.listdir(path) if not i.startswith(".")] |
1059 | f3299a07 | Michael Hanselmann | files.sort() |
1060 | f3299a07 | Michael Hanselmann | return files
|
1061 | 2f8b60b3 | Iustin Pop | |
1062 | 2f8b60b3 | Iustin Pop | |
1063 | 257f4c0a | Iustin Pop | def GetHomeDir(user, default=None): |
1064 | 257f4c0a | Iustin Pop | """Try to get the homedir of the given user.
|
1065 | 257f4c0a | Iustin Pop |
|
1066 | 257f4c0a | Iustin Pop | The user can be passed either as a string (denoting the name) or as
|
1067 | 257f4c0a | Iustin Pop | an integer (denoting the user id). If the user is not found, the
|
1068 | 257f4c0a | Iustin Pop | 'default' argument is returned, which defaults to None.
|
1069 | 2f8b60b3 | Iustin Pop |
|
1070 | 2f8b60b3 | Iustin Pop | """
|
1071 | 2f8b60b3 | Iustin Pop | try:
|
1072 | 257f4c0a | Iustin Pop | if isinstance(user, basestring): |
1073 | 257f4c0a | Iustin Pop | result = pwd.getpwnam(user) |
1074 | 257f4c0a | Iustin Pop | elif isinstance(user, (int, long)): |
1075 | 257f4c0a | Iustin Pop | result = pwd.getpwuid(user) |
1076 | 257f4c0a | Iustin Pop | else:
|
1077 | 257f4c0a | Iustin Pop | raise errors.ProgrammerError("Invalid type passed to GetHomeDir (%s)" % |
1078 | 257f4c0a | Iustin Pop | type(user))
|
1079 | 2f8b60b3 | Iustin Pop | except KeyError: |
1080 | 2f8b60b3 | Iustin Pop | return default
|
1081 | 2f8b60b3 | Iustin Pop | return result.pw_dir
|
1082 | 59072e7e | Michael Hanselmann | |
1083 | 59072e7e | Michael Hanselmann | |
1084 | 24818e8f | Michael Hanselmann | def NewUUID(): |
1085 | 59072e7e | Michael Hanselmann | """Returns a random UUID.
|
1086 | 59072e7e | Michael Hanselmann |
|
1087 | 58885d79 | Iustin Pop | @note: This is a Linux-specific method as it uses the /proc
|
1088 | 58885d79 | Iustin Pop | filesystem.
|
1089 | 58885d79 | Iustin Pop | @rtype: str
|
1090 | 58885d79 | Iustin Pop |
|
1091 | 59072e7e | Michael Hanselmann | """
|
1092 | 59072e7e | Michael Hanselmann | f = open("/proc/sys/kernel/random/uuid", "r") |
1093 | 59072e7e | Michael Hanselmann | try:
|
1094 | 59072e7e | Michael Hanselmann | return f.read(128).rstrip("\n") |
1095 | 59072e7e | Michael Hanselmann | finally:
|
1096 | 59072e7e | Michael Hanselmann | f.close() |
1097 | 087b34fe | Iustin Pop | |
1098 | 087b34fe | Iustin Pop | |
1099 | 33081d90 | Iustin Pop | def GenerateSecret(): |
1100 | 33081d90 | Iustin Pop | """Generates a random secret.
|
1101 | 33081d90 | Iustin Pop |
|
1102 | 33081d90 | Iustin Pop | This will generate a pseudo-random secret, and return its sha digest
|
1103 | 33081d90 | Iustin Pop | (so that it can be used where an ASCII string is needed).
|
1104 | 33081d90 | Iustin Pop |
|
1105 | 58885d79 | Iustin Pop | @rtype: str
|
1106 | 58885d79 | Iustin Pop | @return: a sha1 hexdigest of a block of 64 random bytes
|
1107 | 58885d79 | Iustin Pop |
|
1108 | 33081d90 | Iustin Pop | """
|
1109 | 33081d90 | Iustin Pop | return sha.new(os.urandom(64)).hexdigest() |
1110 | 33081d90 | Iustin Pop | |
1111 | 33081d90 | Iustin Pop | |
1112 | ca0aa6d0 | Michael Hanselmann | def ReadFile(file_name, size=None): |
1113 | ca0aa6d0 | Michael Hanselmann | """Reads a file.
|
1114 | ca0aa6d0 | Michael Hanselmann |
|
1115 | ca0aa6d0 | Michael Hanselmann | @type size: None or int
|
1116 | ca0aa6d0 | Michael Hanselmann | @param size: Read at most size bytes
|
1117 | 58885d79 | Iustin Pop | @rtype: str
|
1118 | 58885d79 | Iustin Pop | @return: the (possibly partial) conent of the file
|
1119 | ca0aa6d0 | Michael Hanselmann |
|
1120 | ca0aa6d0 | Michael Hanselmann | """
|
1121 | ca0aa6d0 | Michael Hanselmann | f = open(file_name, "r") |
1122 | ca0aa6d0 | Michael Hanselmann | try:
|
1123 | ca0aa6d0 | Michael Hanselmann | if size is None: |
1124 | ca0aa6d0 | Michael Hanselmann | return f.read()
|
1125 | ca0aa6d0 | Michael Hanselmann | else:
|
1126 | ca0aa6d0 | Michael Hanselmann | return f.read(size)
|
1127 | ca0aa6d0 | Michael Hanselmann | finally:
|
1128 | ca0aa6d0 | Michael Hanselmann | f.close() |
1129 | ca0aa6d0 | Michael Hanselmann | |
1130 | ca0aa6d0 | Michael Hanselmann | |
1131 | 087b34fe | Iustin Pop | def WriteFile(file_name, fn=None, data=None, |
1132 | 087b34fe | Iustin Pop | mode=None, uid=-1, gid=-1, |
1133 | 71714516 | Michael Hanselmann | atime=None, mtime=None, close=True, |
1134 | 04a8d789 | Michael Hanselmann | dry_run=False, backup=False, |
1135 | 71714516 | Michael Hanselmann | prewrite=None, postwrite=None): |
1136 | 087b34fe | Iustin Pop | """(Over)write a file atomically.
|
1137 | 087b34fe | Iustin Pop |
|
1138 | 087b34fe | Iustin Pop | The file_name and either fn (a function taking one argument, the
|
1139 | 087b34fe | Iustin Pop | file descriptor, and which should write the data to it) or data (the
|
1140 | 087b34fe | Iustin Pop | contents of the file) must be passed. The other arguments are
|
1141 | 087b34fe | Iustin Pop | optional and allow setting the file mode, owner and group, and the
|
1142 | 087b34fe | Iustin Pop | mtime/atime of the file.
|
1143 | 087b34fe | Iustin Pop |
|
1144 | 087b34fe | Iustin Pop | If the function doesn't raise an exception, it has succeeded and the
|
1145 | 087b34fe | Iustin Pop | target file has the new contents. If the file has raised an
|
1146 | 087b34fe | Iustin Pop | exception, an existing target file should be unmodified and the
|
1147 | 087b34fe | Iustin Pop | temporary file should be removed.
|
1148 | 087b34fe | Iustin Pop |
|
1149 | 58885d79 | Iustin Pop | @type file_name: str
|
1150 | 58885d79 | Iustin Pop | @param file_name: the target filename
|
1151 | 58885d79 | Iustin Pop | @type fn: callable
|
1152 | 58885d79 | Iustin Pop | @param fn: content writing function, called with
|
1153 | 58885d79 | Iustin Pop | file descriptor as parameter
|
1154 | 58885d79 | Iustin Pop | @type data: sr
|
1155 | 58885d79 | Iustin Pop | @param data: contents of the file
|
1156 | 58885d79 | Iustin Pop | @type mode: int
|
1157 | 58885d79 | Iustin Pop | @param mode: file mode
|
1158 | 58885d79 | Iustin Pop | @type uid: int
|
1159 | 58885d79 | Iustin Pop | @param uid: the owner of the file
|
1160 | 58885d79 | Iustin Pop | @type gid: int
|
1161 | 58885d79 | Iustin Pop | @param gid: the group of the file
|
1162 | 58885d79 | Iustin Pop | @type atime: int
|
1163 | 58885d79 | Iustin Pop | @param atime: a custom access time to be set on the file
|
1164 | 58885d79 | Iustin Pop | @type mtime: int
|
1165 | 58885d79 | Iustin Pop | @param mtime: a custom modification time to be set on the file
|
1166 | 58885d79 | Iustin Pop | @type close: boolean
|
1167 | 58885d79 | Iustin Pop | @param close: whether to close file after writing it
|
1168 | 58885d79 | Iustin Pop | @type prewrite: callable
|
1169 | 58885d79 | Iustin Pop | @param prewrite: function to be called before writing content
|
1170 | 58885d79 | Iustin Pop | @type postwrite: callable
|
1171 | 58885d79 | Iustin Pop | @param postwrite: function to be called after writing content
|
1172 | 58885d79 | Iustin Pop |
|
1173 | 58885d79 | Iustin Pop | @rtype: None or int
|
1174 | 58885d79 | Iustin Pop | @return: None if the 'close' parameter evaluates to True,
|
1175 | 58885d79 | Iustin Pop | otherwise the file descriptor
|
1176 | 58885d79 | Iustin Pop |
|
1177 | 58885d79 | Iustin Pop | @raise errors.ProgrammerError: if an of the arguments are not valid
|
1178 | 71714516 | Michael Hanselmann |
|
1179 | 087b34fe | Iustin Pop | """
|
1180 | 04a8d789 | Michael Hanselmann | if not os.path.isabs(file_name): |
1181 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Path passed to WriteFile is not" |
1182 | 087b34fe | Iustin Pop | " absolute: '%s'" % file_name)
|
1183 | 087b34fe | Iustin Pop | |
1184 | 087b34fe | Iustin Pop | if [fn, data].count(None) != 1: |
1185 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("fn or data required") |
1186 | 087b34fe | Iustin Pop | |
1187 | 087b34fe | Iustin Pop | if [atime, mtime].count(None) == 1: |
1188 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Both atime and mtime must be either" |
1189 | 087b34fe | Iustin Pop | " set or None")
|
1190 | 087b34fe | Iustin Pop | |
1191 | 70f4497c | Michael Hanselmann | if backup and not dry_run and os.path.isfile(file_name): |
1192 | 70f4497c | Michael Hanselmann | CreateBackup(file_name) |
1193 | 087b34fe | Iustin Pop | |
1194 | 087b34fe | Iustin Pop | dir_name, base_name = os.path.split(file_name) |
1195 | 087b34fe | Iustin Pop | fd, new_name = tempfile.mkstemp('.new', base_name, dir_name)
|
1196 | 087b34fe | Iustin Pop | # here we need to make sure we remove the temp file, if any error
|
1197 | 087b34fe | Iustin Pop | # leaves it in place
|
1198 | 087b34fe | Iustin Pop | try:
|
1199 | 087b34fe | Iustin Pop | if uid != -1 or gid != -1: |
1200 | 087b34fe | Iustin Pop | os.chown(new_name, uid, gid) |
1201 | 087b34fe | Iustin Pop | if mode:
|
1202 | 087b34fe | Iustin Pop | os.chmod(new_name, mode) |
1203 | 71714516 | Michael Hanselmann | if callable(prewrite): |
1204 | 71714516 | Michael Hanselmann | prewrite(fd) |
1205 | 087b34fe | Iustin Pop | if data is not None: |
1206 | 087b34fe | Iustin Pop | os.write(fd, data) |
1207 | 087b34fe | Iustin Pop | else:
|
1208 | 087b34fe | Iustin Pop | fn(fd) |
1209 | 71714516 | Michael Hanselmann | if callable(postwrite): |
1210 | 71714516 | Michael Hanselmann | postwrite(fd) |
1211 | 087b34fe | Iustin Pop | os.fsync(fd) |
1212 | 087b34fe | Iustin Pop | if atime is not None and mtime is not None: |
1213 | 087b34fe | Iustin Pop | os.utime(new_name, (atime, mtime)) |
1214 | 70f4497c | Michael Hanselmann | if not dry_run: |
1215 | 70f4497c | Michael Hanselmann | os.rename(new_name, file_name) |
1216 | 087b34fe | Iustin Pop | finally:
|
1217 | 71714516 | Michael Hanselmann | if close:
|
1218 | 71714516 | Michael Hanselmann | os.close(fd) |
1219 | 71714516 | Michael Hanselmann | result = None
|
1220 | 71714516 | Michael Hanselmann | else:
|
1221 | 71714516 | Michael Hanselmann | result = fd |
1222 | 087b34fe | Iustin Pop | RemoveFile(new_name) |
1223 | 78feb6fb | Guido Trotter | |
1224 | 71714516 | Michael Hanselmann | return result
|
1225 | 71714516 | Michael Hanselmann | |
1226 | 78feb6fb | Guido Trotter | |
1227 | 7b4126b7 | Iustin Pop | def FirstFree(seq, base=0): |
1228 | 7b4126b7 | Iustin Pop | """Returns the first non-existing integer from seq.
|
1229 | 7b4126b7 | Iustin Pop |
|
1230 | 7b4126b7 | Iustin Pop | The seq argument should be a sorted list of positive integers. The
|
1231 | 7b4126b7 | Iustin Pop | first time the index of an element is smaller than the element
|
1232 | 7b4126b7 | Iustin Pop | value, the index will be returned.
|
1233 | 7b4126b7 | Iustin Pop |
|
1234 | 7b4126b7 | Iustin Pop | The base argument is used to start at a different offset,
|
1235 | 58885d79 | Iustin Pop | i.e. C{[3, 4, 6]} with I{offset=3} will return 5.
|
1236 | 58885d79 | Iustin Pop |
|
1237 | 58885d79 | Iustin Pop | Example: C{[0, 1, 3]} will return I{2}.
|
1238 | 7b4126b7 | Iustin Pop |
|
1239 | 58885d79 | Iustin Pop | @type seq: sequence
|
1240 | 58885d79 | Iustin Pop | @param seq: the sequence to be analyzed.
|
1241 | 58885d79 | Iustin Pop | @type base: int
|
1242 | 58885d79 | Iustin Pop | @param base: use this value as the base index of the sequence
|
1243 | 58885d79 | Iustin Pop | @rtype: int
|
1244 | 58885d79 | Iustin Pop | @return: the first non-used index in the sequence
|
1245 | 7b4126b7 | Iustin Pop |
|
1246 | 7b4126b7 | Iustin Pop | """
|
1247 | 7b4126b7 | Iustin Pop | for idx, elem in enumerate(seq): |
1248 | 7b4126b7 | Iustin Pop | assert elem >= base, "Passed element is higher than base offset" |
1249 | 7b4126b7 | Iustin Pop | if elem > idx + base:
|
1250 | 7b4126b7 | Iustin Pop | # idx is not used
|
1251 | 7b4126b7 | Iustin Pop | return idx + base
|
1252 | 7b4126b7 | Iustin Pop | return None |
1253 | 7b4126b7 | Iustin Pop | |
1254 | 7b4126b7 | Iustin Pop | |
1255 | 78feb6fb | Guido Trotter | def all(seq, pred=bool): |
1256 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for every element in the iterable"
|
1257 | 78feb6fb | Guido Trotter | for elem in itertools.ifilterfalse(pred, seq): |
1258 | 78feb6fb | Guido Trotter | return False |
1259 | 78feb6fb | Guido Trotter | return True |
1260 | 78feb6fb | Guido Trotter | |
1261 | 78feb6fb | Guido Trotter | |
1262 | 78feb6fb | Guido Trotter | def any(seq, pred=bool): |
1263 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for at least one element in the iterable"
|
1264 | 78feb6fb | Guido Trotter | for elem in itertools.ifilter(pred, seq): |
1265 | 78feb6fb | Guido Trotter | return True |
1266 | 78feb6fb | Guido Trotter | return False |
1267 | f7414041 | Michael Hanselmann | |
1268 | f7414041 | Michael Hanselmann | |
1269 | f7414041 | Michael Hanselmann | def UniqueSequence(seq): |
1270 | f7414041 | Michael Hanselmann | """Returns a list with unique elements.
|
1271 | f7414041 | Michael Hanselmann |
|
1272 | f7414041 | Michael Hanselmann | Element order is preserved.
|
1273 | 58885d79 | Iustin Pop |
|
1274 | 58885d79 | Iustin Pop | @type seq: sequence
|
1275 | 58885d79 | Iustin Pop | @param seq: the sequence with the source elementes
|
1276 | 58885d79 | Iustin Pop | @rtype: list
|
1277 | 58885d79 | Iustin Pop | @return: list of unique elements from seq
|
1278 | 58885d79 | Iustin Pop |
|
1279 | f7414041 | Michael Hanselmann | """
|
1280 | f7414041 | Michael Hanselmann | seen = set()
|
1281 | f7414041 | Michael Hanselmann | return [i for i in seq if i not in seen and not seen.add(i)] |
1282 | 1862d460 | Alexander Schreiber | |
1283 | 1862d460 | Alexander Schreiber | |
1284 | 1862d460 | Alexander Schreiber | def IsValidMac(mac): |
1285 | 1862d460 | Alexander Schreiber | """Predicate to check if a MAC address is valid.
|
1286 | 1862d460 | Alexander Schreiber |
|
1287 | 1862d460 | Alexander Schreiber | Checks wether the supplied MAC address is formally correct, only
|
1288 | 1862d460 | Alexander Schreiber | accepts colon separated format.
|
1289 | 58885d79 | Iustin Pop |
|
1290 | 58885d79 | Iustin Pop | @type mac: str
|
1291 | 58885d79 | Iustin Pop | @param mac: the MAC to be validated
|
1292 | 58885d79 | Iustin Pop | @rtype: boolean
|
1293 | 58885d79 | Iustin Pop | @return: True is the MAC seems valid
|
1294 | 58885d79 | Iustin Pop |
|
1295 | 1862d460 | Alexander Schreiber | """
|
1296 | 1862d460 | Alexander Schreiber | mac_check = re.compile("^([0-9a-f]{2}(:|$)){6}$")
|
1297 | 1862d460 | Alexander Schreiber | return mac_check.match(mac) is not None |
1298 | 06009e27 | Iustin Pop | |
1299 | 06009e27 | Iustin Pop | |
1300 | 06009e27 | Iustin Pop | def TestDelay(duration): |
1301 | 06009e27 | Iustin Pop | """Sleep for a fixed amount of time.
|
1302 | 06009e27 | Iustin Pop |
|
1303 | 58885d79 | Iustin Pop | @type duration: float
|
1304 | 58885d79 | Iustin Pop | @param duration: the sleep duration
|
1305 | 58885d79 | Iustin Pop | @rtype: boolean
|
1306 | 58885d79 | Iustin Pop | @return: False for negative value, True otherwise
|
1307 | 58885d79 | Iustin Pop |
|
1308 | 06009e27 | Iustin Pop | """
|
1309 | 06009e27 | Iustin Pop | if duration < 0: |
1310 | 06009e27 | Iustin Pop | return False |
1311 | 06009e27 | Iustin Pop | time.sleep(duration) |
1312 | 06009e27 | Iustin Pop | return True |
1313 | 8f765069 | Iustin Pop | |
1314 | 8f765069 | Iustin Pop | |
1315 | 8ff612c2 | Iustin Pop | def Daemonize(logfile, noclose_fds=None): |
1316 | 8f765069 | Iustin Pop | """Daemonize the current process.
|
1317 | 8f765069 | Iustin Pop |
|
1318 | 8f765069 | Iustin Pop | This detaches the current process from the controlling terminal and
|
1319 | 8f765069 | Iustin Pop | runs it in the background as a daemon.
|
1320 | 8f765069 | Iustin Pop |
|
1321 | 58885d79 | Iustin Pop | @type logfile: str
|
1322 | 58885d79 | Iustin Pop | @param logfile: the logfile to which we should redirect stdout/stderr
|
1323 | 58885d79 | Iustin Pop | @type noclose_fds: list or None
|
1324 | 58885d79 | Iustin Pop | @param noclose_fds: if given, it denotes a list of file descriptor
|
1325 | 58885d79 | Iustin Pop | that should not be closed
|
1326 | 58885d79 | Iustin Pop | @rtype: int
|
1327 | 58885d79 | Iustin Pop | @returns: the value zero
|
1328 | 58885d79 | Iustin Pop |
|
1329 | 8f765069 | Iustin Pop | """
|
1330 | 8f765069 | Iustin Pop | UMASK = 077
|
1331 | 8f765069 | Iustin Pop | WORKDIR = "/"
|
1332 | 8f765069 | Iustin Pop | # Default maximum for the number of available file descriptors.
|
1333 | 8f765069 | Iustin Pop | if 'SC_OPEN_MAX' in os.sysconf_names: |
1334 | 8f765069 | Iustin Pop | try:
|
1335 | 8f765069 | Iustin Pop | MAXFD = os.sysconf('SC_OPEN_MAX')
|
1336 | 8f765069 | Iustin Pop | if MAXFD < 0: |
1337 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1338 | 8f765069 | Iustin Pop | except OSError: |
1339 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1340 | 8f765069 | Iustin Pop | else:
|
1341 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1342 | 8f765069 | Iustin Pop | |
1343 | 8f765069 | Iustin Pop | # this might fail
|
1344 | 8f765069 | Iustin Pop | pid = os.fork() |
1345 | 8f765069 | Iustin Pop | if (pid == 0): # The first child. |
1346 | 8f765069 | Iustin Pop | os.setsid() |
1347 | 8f765069 | Iustin Pop | # this might fail
|
1348 | 8f765069 | Iustin Pop | pid = os.fork() # Fork a second child.
|
1349 | 8f765069 | Iustin Pop | if (pid == 0): # The second child. |
1350 | 8f765069 | Iustin Pop | os.chdir(WORKDIR) |
1351 | 8f765069 | Iustin Pop | os.umask(UMASK) |
1352 | 8f765069 | Iustin Pop | else:
|
1353 | 8f765069 | Iustin Pop | # exit() or _exit()? See below.
|
1354 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent (the first child) of the second child. |
1355 | 8f765069 | Iustin Pop | else:
|
1356 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent of the first child. |
1357 | 8f765069 | Iustin Pop | maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
|
1358 | 8f765069 | Iustin Pop | if (maxfd == resource.RLIM_INFINITY):
|
1359 | 8f765069 | Iustin Pop | maxfd = MAXFD |
1360 | 8f765069 | Iustin Pop | |
1361 | 8f765069 | Iustin Pop | # Iterate through and close all file descriptors.
|
1362 | 8f765069 | Iustin Pop | for fd in range(0, maxfd): |
1363 | 8ff612c2 | Iustin Pop | if noclose_fds and fd in noclose_fds: |
1364 | 8ff612c2 | Iustin Pop | continue
|
1365 | 8f765069 | Iustin Pop | try:
|
1366 | 8f765069 | Iustin Pop | os.close(fd) |
1367 | 8f765069 | Iustin Pop | except OSError: # ERROR, fd wasn't open to begin with (ignored) |
1368 | 8f765069 | Iustin Pop | pass
|
1369 | 8f765069 | Iustin Pop | os.open(logfile, os.O_RDWR|os.O_CREAT|os.O_APPEND, 0600)
|
1370 | 8f765069 | Iustin Pop | # Duplicate standard input to standard output and standard error.
|
1371 | 8f765069 | Iustin Pop | os.dup2(0, 1) # standard output (1) |
1372 | 8f765069 | Iustin Pop | os.dup2(0, 2) # standard error (2) |
1373 | 8f765069 | Iustin Pop | return 0 |
1374 | 57c177af | Iustin Pop | |
1375 | 57c177af | Iustin Pop | |
1376 | 53beffbb | Iustin Pop | def DaemonPidFileName(name): |
1377 | 58885d79 | Iustin Pop | """Compute a ganeti pid file absolute path
|
1378 | 58885d79 | Iustin Pop |
|
1379 | 58885d79 | Iustin Pop | @type name: str
|
1380 | 58885d79 | Iustin Pop | @param name: the daemon name
|
1381 | 58885d79 | Iustin Pop | @rtype: str
|
1382 | 58885d79 | Iustin Pop | @return: the full path to the pidfile corresponding to the given
|
1383 | 58885d79 | Iustin Pop | daemon name
|
1384 | b330ac0b | Guido Trotter |
|
1385 | b330ac0b | Guido Trotter | """
|
1386 | b330ac0b | Guido Trotter | return os.path.join(constants.RUN_GANETI_DIR, "%s.pid" % name) |
1387 | b330ac0b | Guido Trotter | |
1388 | b330ac0b | Guido Trotter | |
1389 | b330ac0b | Guido Trotter | def WritePidFile(name): |
1390 | b330ac0b | Guido Trotter | """Write the current process pidfile.
|
1391 | b330ac0b | Guido Trotter |
|
1392 | 58885d79 | Iustin Pop | The file will be written to L{constants.RUN_GANETI_DIR}I{/name.pid}
|
1393 | 58885d79 | Iustin Pop |
|
1394 | 58885d79 | Iustin Pop | @type name: str
|
1395 | 58885d79 | Iustin Pop | @param name: the daemon name to use
|
1396 | 58885d79 | Iustin Pop | @raise errors.GenericError: if the pid file already exists and
|
1397 | 58885d79 | Iustin Pop | points to a live process
|
1398 | b330ac0b | Guido Trotter |
|
1399 | b330ac0b | Guido Trotter | """
|
1400 | b330ac0b | Guido Trotter | pid = os.getpid() |
1401 | 53beffbb | Iustin Pop | pidfilename = DaemonPidFileName(name) |
1402 | d9f311d7 | Iustin Pop | if IsProcessAlive(ReadPidFile(pidfilename)):
|
1403 | 533bb4b1 | Michael Hanselmann | raise errors.GenericError("%s contains a live process" % pidfilename) |
1404 | b330ac0b | Guido Trotter | |
1405 | b330ac0b | Guido Trotter | WriteFile(pidfilename, data="%d\n" % pid)
|
1406 | b330ac0b | Guido Trotter | |
1407 | b330ac0b | Guido Trotter | |
1408 | b330ac0b | Guido Trotter | def RemovePidFile(name): |
1409 | b330ac0b | Guido Trotter | """Remove the current process pidfile.
|
1410 | b330ac0b | Guido Trotter |
|
1411 | b330ac0b | Guido Trotter | Any errors are ignored.
|
1412 | b330ac0b | Guido Trotter |
|
1413 | 58885d79 | Iustin Pop | @type name: str
|
1414 | 58885d79 | Iustin Pop | @param name: the daemon name used to derive the pidfile name
|
1415 | 58885d79 | Iustin Pop |
|
1416 | b330ac0b | Guido Trotter | """
|
1417 | b330ac0b | Guido Trotter | pid = os.getpid() |
1418 | 53beffbb | Iustin Pop | pidfilename = DaemonPidFileName(name) |
1419 | b330ac0b | Guido Trotter | # TODO: we could check here that the file contains our pid
|
1420 | b330ac0b | Guido Trotter | try:
|
1421 | b330ac0b | Guido Trotter | RemoveFile(pidfilename) |
1422 | b330ac0b | Guido Trotter | except:
|
1423 | b330ac0b | Guido Trotter | pass
|
1424 | b330ac0b | Guido Trotter | |
1425 | b330ac0b | Guido Trotter | |
1426 | ff5251bc | Iustin Pop | def KillProcess(pid, signal_=signal.SIGTERM, timeout=30, |
1427 | ff5251bc | Iustin Pop | waitpid=False):
|
1428 | b2a1f511 | Iustin Pop | """Kill a process given by its pid.
|
1429 | b2a1f511 | Iustin Pop |
|
1430 | b2a1f511 | Iustin Pop | @type pid: int
|
1431 | b2a1f511 | Iustin Pop | @param pid: The PID to terminate.
|
1432 | 38206f3c | Iustin Pop | @type signal_: int
|
1433 | 38206f3c | Iustin Pop | @param signal_: The signal to send, by default SIGTERM
|
1434 | b2a1f511 | Iustin Pop | @type timeout: int
|
1435 | b2a1f511 | Iustin Pop | @param timeout: The timeout after which, if the process is still alive,
|
1436 | b2a1f511 | Iustin Pop | a SIGKILL will be sent. If not positive, no such checking
|
1437 | b2a1f511 | Iustin Pop | will be done
|
1438 | ff5251bc | Iustin Pop | @type waitpid: boolean
|
1439 | ff5251bc | Iustin Pop | @param waitpid: If true, we should waitpid on this process after
|
1440 | ff5251bc | Iustin Pop | sending signals, since it's our own child and otherwise it
|
1441 | ff5251bc | Iustin Pop | would remain as zombie
|
1442 | b2a1f511 | Iustin Pop |
|
1443 | b2a1f511 | Iustin Pop | """
|
1444 | ff5251bc | Iustin Pop | def _helper(pid, signal_, wait): |
1445 | ff5251bc | Iustin Pop | """Simple helper to encapsulate the kill/waitpid sequence"""
|
1446 | ff5251bc | Iustin Pop | os.kill(pid, signal_) |
1447 | ff5251bc | Iustin Pop | if wait:
|
1448 | ff5251bc | Iustin Pop | try:
|
1449 | ff5251bc | Iustin Pop | os.waitpid(pid, os.WNOHANG) |
1450 | ff5251bc | Iustin Pop | except OSError: |
1451 | ff5251bc | Iustin Pop | pass
|
1452 | ff5251bc | Iustin Pop | |
1453 | b2a1f511 | Iustin Pop | if pid <= 0: |
1454 | b2a1f511 | Iustin Pop | # kill with pid=0 == suicide
|
1455 | b2a1f511 | Iustin Pop | raise errors.ProgrammerError("Invalid pid given '%s'" % pid) |
1456 | b2a1f511 | Iustin Pop | |
1457 | b2a1f511 | Iustin Pop | if not IsProcessAlive(pid): |
1458 | b2a1f511 | Iustin Pop | return
|
1459 | ff5251bc | Iustin Pop | _helper(pid, signal_, waitpid) |
1460 | b2a1f511 | Iustin Pop | if timeout <= 0: |
1461 | b2a1f511 | Iustin Pop | return
|
1462 | b2a1f511 | Iustin Pop | end = time.time() + timeout |
1463 | b2a1f511 | Iustin Pop | while time.time() < end and IsProcessAlive(pid): |
1464 | b2a1f511 | Iustin Pop | time.sleep(0.1)
|
1465 | b2a1f511 | Iustin Pop | if IsProcessAlive(pid):
|
1466 | e1bd0072 | Iustin Pop | _helper(pid, signal.SIGKILL, waitpid) |
1467 | b2a1f511 | Iustin Pop | |
1468 | b2a1f511 | Iustin Pop | |
1469 | 57c177af | Iustin Pop | def FindFile(name, search_path, test=os.path.exists): |
1470 | 57c177af | Iustin Pop | """Look for a filesystem object in a given path.
|
1471 | 57c177af | Iustin Pop |
|
1472 | 57c177af | Iustin Pop | This is an abstract method to search for filesystem object (files,
|
1473 | 57c177af | Iustin Pop | dirs) under a given search path.
|
1474 | 57c177af | Iustin Pop |
|
1475 | 58885d79 | Iustin Pop | @type name: str
|
1476 | 58885d79 | Iustin Pop | @param name: the name to look for
|
1477 | 58885d79 | Iustin Pop | @type search_path: str
|
1478 | 58885d79 | Iustin Pop | @param search_path: location to start at
|
1479 | 58885d79 | Iustin Pop | @type test: callable
|
1480 | 58885d79 | Iustin Pop | @param test: a function taking one argument that should return True
|
1481 | 58885d79 | Iustin Pop | if the a given object is valid; the default value is
|
1482 | 58885d79 | Iustin Pop | os.path.exists, causing only existing files to be returned
|
1483 | 58885d79 | Iustin Pop | @rtype: str or None
|
1484 | 58885d79 | Iustin Pop | @return: full path to the object if found, None otherwise
|
1485 | 57c177af | Iustin Pop |
|
1486 | 57c177af | Iustin Pop | """
|
1487 | 57c177af | Iustin Pop | for dir_name in search_path: |
1488 | 57c177af | Iustin Pop | item_name = os.path.sep.join([dir_name, name]) |
1489 | 57c177af | Iustin Pop | if test(item_name):
|
1490 | 57c177af | Iustin Pop | return item_name
|
1491 | 57c177af | Iustin Pop | return None |
1492 | 8d1a2a64 | Michael Hanselmann | |
1493 | 8d1a2a64 | Michael Hanselmann | |
1494 | 8d1a2a64 | Michael Hanselmann | def CheckVolumeGroupSize(vglist, vgname, minsize): |
1495 | 8d1a2a64 | Michael Hanselmann | """Checks if the volume group list is valid.
|
1496 | 8d1a2a64 | Michael Hanselmann |
|
1497 | 58885d79 | Iustin Pop | The function will check if a given volume group is in the list of
|
1498 | 58885d79 | Iustin Pop | volume groups and has a minimum size.
|
1499 | 58885d79 | Iustin Pop |
|
1500 | 58885d79 | Iustin Pop | @type vglist: dict
|
1501 | 58885d79 | Iustin Pop | @param vglist: dictionary of volume group names and their size
|
1502 | 58885d79 | Iustin Pop | @type vgname: str
|
1503 | 58885d79 | Iustin Pop | @param vgname: the volume group we should check
|
1504 | 58885d79 | Iustin Pop | @type minsize: int
|
1505 | 58885d79 | Iustin Pop | @param minsize: the minimum size we accept
|
1506 | 58885d79 | Iustin Pop | @rtype: None or str
|
1507 | 58885d79 | Iustin Pop | @return: None for success, otherwise the error message
|
1508 | 8d1a2a64 | Michael Hanselmann |
|
1509 | 8d1a2a64 | Michael Hanselmann | """
|
1510 | 8d1a2a64 | Michael Hanselmann | vgsize = vglist.get(vgname, None)
|
1511 | 8d1a2a64 | Michael Hanselmann | if vgsize is None: |
1512 | 8d1a2a64 | Michael Hanselmann | return "volume group '%s' missing" % vgname |
1513 | 8d1a2a64 | Michael Hanselmann | elif vgsize < minsize:
|
1514 | 8d1a2a64 | Michael Hanselmann | return ("volume group '%s' too small (%s MiB required, %d MiB found)" % |
1515 | 8d1a2a64 | Michael Hanselmann | (vgname, minsize, vgsize)) |
1516 | 8d1a2a64 | Michael Hanselmann | return None |
1517 | 7996a135 | Iustin Pop | |
1518 | 7996a135 | Iustin Pop | |
1519 | 45bc5e4a | Michael Hanselmann | def SplitTime(value): |
1520 | 739be818 | Michael Hanselmann | """Splits time as floating point number into a tuple.
|
1521 | 739be818 | Michael Hanselmann |
|
1522 | 45bc5e4a | Michael Hanselmann | @param value: Time in seconds
|
1523 | 45bc5e4a | Michael Hanselmann | @type value: int or float
|
1524 | 45bc5e4a | Michael Hanselmann | @return: Tuple containing (seconds, microseconds)
|
1525 | 739be818 | Michael Hanselmann |
|
1526 | 739be818 | Michael Hanselmann | """
|
1527 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = divmod(int(value * 1000000), 1000000) |
1528 | 45bc5e4a | Michael Hanselmann | |
1529 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1530 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
1531 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
1532 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
1533 | 45bc5e4a | Michael Hanselmann | |
1534 | 45bc5e4a | Michael Hanselmann | return (int(seconds), int(microseconds)) |
1535 | 739be818 | Michael Hanselmann | |
1536 | 739be818 | Michael Hanselmann | |
1537 | 739be818 | Michael Hanselmann | def MergeTime(timetuple): |
1538 | 739be818 | Michael Hanselmann | """Merges a tuple into time as a floating point number.
|
1539 | 739be818 | Michael Hanselmann |
|
1540 | 45bc5e4a | Michael Hanselmann | @param timetuple: Time as tuple, (seconds, microseconds)
|
1541 | 739be818 | Michael Hanselmann | @type timetuple: tuple
|
1542 | 739be818 | Michael Hanselmann | @return: Time as a floating point number expressed in seconds
|
1543 | 739be818 | Michael Hanselmann |
|
1544 | 739be818 | Michael Hanselmann | """
|
1545 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = timetuple |
1546 | 739be818 | Michael Hanselmann | |
1547 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1548 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
1549 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
1550 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
1551 | 739be818 | Michael Hanselmann | |
1552 | 45bc5e4a | Michael Hanselmann | return float(seconds) + (float(microseconds) * 0.000001) |
1553 | 739be818 | Michael Hanselmann | |
1554 | 739be818 | Michael Hanselmann | |
1555 | 4a8b186a | Michael Hanselmann | def GetNodeDaemonPort(): |
1556 | 4a8b186a | Michael Hanselmann | """Get the node daemon port for this cluster.
|
1557 | 4a8b186a | Michael Hanselmann |
|
1558 | 4a8b186a | Michael Hanselmann | Note that this routine does not read a ganeti-specific file, but
|
1559 | 58885d79 | Iustin Pop | instead uses C{socket.getservbyname} to allow pre-customization of
|
1560 | 4a8b186a | Michael Hanselmann | this parameter outside of Ganeti.
|
1561 | 4a8b186a | Michael Hanselmann |
|
1562 | 58885d79 | Iustin Pop | @rtype: int
|
1563 | 58885d79 | Iustin Pop |
|
1564 | 4a8b186a | Michael Hanselmann | """
|
1565 | 4a8b186a | Michael Hanselmann | try:
|
1566 | 4a8b186a | Michael Hanselmann | port = socket.getservbyname("ganeti-noded", "tcp") |
1567 | 4a8b186a | Michael Hanselmann | except socket.error:
|
1568 | 4a8b186a | Michael Hanselmann | port = constants.DEFAULT_NODED_PORT |
1569 | 4a8b186a | Michael Hanselmann | |
1570 | 4a8b186a | Michael Hanselmann | return port
|
1571 | 4a8b186a | Michael Hanselmann | |
1572 | 4a8b186a | Michael Hanselmann | |
1573 | 82d9caef | Iustin Pop | def SetupLogging(logfile, debug=False, stderr_logging=False, program=""): |
1574 | 82d9caef | Iustin Pop | """Configures the logging module.
|
1575 | 82d9caef | Iustin Pop |
|
1576 | 58885d79 | Iustin Pop | @type logfile: str
|
1577 | 58885d79 | Iustin Pop | @param logfile: the filename to which we should log
|
1578 | 58885d79 | Iustin Pop | @type debug: boolean
|
1579 | 58885d79 | Iustin Pop | @param debug: whether to enable debug messages too or
|
1580 | 58885d79 | Iustin Pop | only those at C{INFO} and above level
|
1581 | 58885d79 | Iustin Pop | @type stderr_logging: boolean
|
1582 | 58885d79 | Iustin Pop | @param stderr_logging: whether we should also log to the standard error
|
1583 | 58885d79 | Iustin Pop | @type program: str
|
1584 | 58885d79 | Iustin Pop | @param program: the name under which we should log messages
|
1585 | 58885d79 | Iustin Pop | @raise EnvironmentError: if we can't open the log file and
|
1586 | 58885d79 | Iustin Pop | stderr logging is disabled
|
1587 | 58885d79 | Iustin Pop |
|
1588 | 82d9caef | Iustin Pop | """
|
1589 | 82d9caef | Iustin Pop | fmt = "%(asctime)s: " + program + " " |
1590 | 82d9caef | Iustin Pop | if debug:
|
1591 | 82d9caef | Iustin Pop | fmt += ("pid=%(process)d/%(threadName)s %(levelname)s"
|
1592 | 82d9caef | Iustin Pop | " %(module)s:%(lineno)s %(message)s")
|
1593 | 82d9caef | Iustin Pop | else:
|
1594 | 82d9caef | Iustin Pop | fmt += "pid=%(process)d %(levelname)s %(message)s"
|
1595 | 82d9caef | Iustin Pop | formatter = logging.Formatter(fmt) |
1596 | 82d9caef | Iustin Pop | |
1597 | 82d9caef | Iustin Pop | root_logger = logging.getLogger("")
|
1598 | 82d9caef | Iustin Pop | root_logger.setLevel(logging.NOTSET) |
1599 | 82d9caef | Iustin Pop | |
1600 | 6346a9e5 | Michael Hanselmann | # Remove all previously setup handlers
|
1601 | 6346a9e5 | Michael Hanselmann | for handler in root_logger.handlers: |
1602 | 6346a9e5 | Michael Hanselmann | root_logger.removeHandler(handler) |
1603 | 6346a9e5 | Michael Hanselmann | |
1604 | 82d9caef | Iustin Pop | if stderr_logging:
|
1605 | 82d9caef | Iustin Pop | stderr_handler = logging.StreamHandler() |
1606 | 82d9caef | Iustin Pop | stderr_handler.setFormatter(formatter) |
1607 | 82d9caef | Iustin Pop | if debug:
|
1608 | 82d9caef | Iustin Pop | stderr_handler.setLevel(logging.NOTSET) |
1609 | 82d9caef | Iustin Pop | else:
|
1610 | 82d9caef | Iustin Pop | stderr_handler.setLevel(logging.CRITICAL) |
1611 | 82d9caef | Iustin Pop | root_logger.addHandler(stderr_handler) |
1612 | 82d9caef | Iustin Pop | |
1613 | 82d9caef | Iustin Pop | # this can fail, if the logging directories are not setup or we have
|
1614 | 82d9caef | Iustin Pop | # a permisssion problem; in this case, it's best to log but ignore
|
1615 | 82d9caef | Iustin Pop | # the error if stderr_logging is True, and if false we re-raise the
|
1616 | 82d9caef | Iustin Pop | # exception since otherwise we could run but without any logs at all
|
1617 | 82d9caef | Iustin Pop | try:
|
1618 | 82d9caef | Iustin Pop | logfile_handler = logging.FileHandler(logfile) |
1619 | 82d9caef | Iustin Pop | logfile_handler.setFormatter(formatter) |
1620 | 82d9caef | Iustin Pop | if debug:
|
1621 | 82d9caef | Iustin Pop | logfile_handler.setLevel(logging.DEBUG) |
1622 | 82d9caef | Iustin Pop | else:
|
1623 | 82d9caef | Iustin Pop | logfile_handler.setLevel(logging.INFO) |
1624 | 82d9caef | Iustin Pop | root_logger.addHandler(logfile_handler) |
1625 | 82d9caef | Iustin Pop | except EnvironmentError, err: |
1626 | 82d9caef | Iustin Pop | if stderr_logging:
|
1627 | 82d9caef | Iustin Pop | logging.exception("Failed to enable logging to file '%s'", logfile)
|
1628 | 82d9caef | Iustin Pop | else:
|
1629 | 82d9caef | Iustin Pop | # we need to re-raise the exception
|
1630 | 82d9caef | Iustin Pop | raise
|
1631 | 82d9caef | Iustin Pop | |
1632 | 82d9caef | Iustin Pop | |
1633 | 7996a135 | Iustin Pop | def LockedMethod(fn): |
1634 | 7996a135 | Iustin Pop | """Synchronized object access decorator.
|
1635 | 7996a135 | Iustin Pop |
|
1636 | 7996a135 | Iustin Pop | This decorator is intended to protect access to an object using the
|
1637 | 7996a135 | Iustin Pop | object's own lock which is hardcoded to '_lock'.
|
1638 | 7996a135 | Iustin Pop |
|
1639 | 7996a135 | Iustin Pop | """
|
1640 | e67bd559 | Michael Hanselmann | def _LockDebug(*args, **kwargs): |
1641 | e67bd559 | Michael Hanselmann | if debug_locks:
|
1642 | e67bd559 | Michael Hanselmann | logging.debug(*args, **kwargs) |
1643 | e67bd559 | Michael Hanselmann | |
1644 | 7996a135 | Iustin Pop | def wrapper(self, *args, **kwargs): |
1645 | 7996a135 | Iustin Pop | assert hasattr(self, '_lock') |
1646 | 7996a135 | Iustin Pop | lock = self._lock
|
1647 | e67bd559 | Michael Hanselmann | _LockDebug("Waiting for %s", lock)
|
1648 | 7996a135 | Iustin Pop | lock.acquire() |
1649 | 7996a135 | Iustin Pop | try:
|
1650 | e67bd559 | Michael Hanselmann | _LockDebug("Acquired %s", lock)
|
1651 | 7996a135 | Iustin Pop | result = fn(self, *args, **kwargs)
|
1652 | 7996a135 | Iustin Pop | finally:
|
1653 | e67bd559 | Michael Hanselmann | _LockDebug("Releasing %s", lock)
|
1654 | 7996a135 | Iustin Pop | lock.release() |
1655 | e67bd559 | Michael Hanselmann | _LockDebug("Released %s", lock)
|
1656 | 7996a135 | Iustin Pop | return result
|
1657 | 7996a135 | Iustin Pop | return wrapper
|
1658 | eb0f0ce0 | Michael Hanselmann | |
1659 | eb0f0ce0 | Michael Hanselmann | |
1660 | eb0f0ce0 | Michael Hanselmann | def LockFile(fd): |
1661 | eb0f0ce0 | Michael Hanselmann | """Locks a file using POSIX locks.
|
1662 | eb0f0ce0 | Michael Hanselmann |
|
1663 | 58885d79 | Iustin Pop | @type fd: int
|
1664 | 58885d79 | Iustin Pop | @param fd: the file descriptor we need to lock
|
1665 | 58885d79 | Iustin Pop |
|
1666 | eb0f0ce0 | Michael Hanselmann | """
|
1667 | eb0f0ce0 | Michael Hanselmann | try:
|
1668 | eb0f0ce0 | Michael Hanselmann | fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) |
1669 | eb0f0ce0 | Michael Hanselmann | except IOError, err: |
1670 | eb0f0ce0 | Michael Hanselmann | if err.errno == errno.EAGAIN:
|
1671 | eb0f0ce0 | Michael Hanselmann | raise errors.LockError("File already locked") |
1672 | eb0f0ce0 | Michael Hanselmann | raise
|
1673 | de499029 | Michael Hanselmann | |
1674 | de499029 | Michael Hanselmann | |
1675 | a87b4824 | Michael Hanselmann | class FileLock(object): |
1676 | a87b4824 | Michael Hanselmann | """Utility class for file locks.
|
1677 | a87b4824 | Michael Hanselmann |
|
1678 | a87b4824 | Michael Hanselmann | """
|
1679 | a87b4824 | Michael Hanselmann | def __init__(self, filename): |
1680 | 58885d79 | Iustin Pop | """Constructor for FileLock.
|
1681 | 58885d79 | Iustin Pop |
|
1682 | 58885d79 | Iustin Pop | This will open the file denoted by the I{filename} argument.
|
1683 | 58885d79 | Iustin Pop |
|
1684 | 58885d79 | Iustin Pop | @type filename: str
|
1685 | 58885d79 | Iustin Pop | @param filename: path to the file to be locked
|
1686 | 58885d79 | Iustin Pop |
|
1687 | 58885d79 | Iustin Pop | """
|
1688 | a87b4824 | Michael Hanselmann | self.filename = filename
|
1689 | a87b4824 | Michael Hanselmann | self.fd = open(self.filename, "w") |
1690 | a87b4824 | Michael Hanselmann | |
1691 | a87b4824 | Michael Hanselmann | def __del__(self): |
1692 | a87b4824 | Michael Hanselmann | self.Close()
|
1693 | a87b4824 | Michael Hanselmann | |
1694 | a87b4824 | Michael Hanselmann | def Close(self): |
1695 | 58885d79 | Iustin Pop | """Close the file and release the lock.
|
1696 | 58885d79 | Iustin Pop |
|
1697 | 58885d79 | Iustin Pop | """
|
1698 | a87b4824 | Michael Hanselmann | if self.fd: |
1699 | a87b4824 | Michael Hanselmann | self.fd.close()
|
1700 | a87b4824 | Michael Hanselmann | self.fd = None |
1701 | a87b4824 | Michael Hanselmann | |
1702 | aa74b828 | Michael Hanselmann | def _flock(self, flag, blocking, timeout, errmsg): |
1703 | aa74b828 | Michael Hanselmann | """Wrapper for fcntl.flock.
|
1704 | aa74b828 | Michael Hanselmann |
|
1705 | aa74b828 | Michael Hanselmann | @type flag: int
|
1706 | 58885d79 | Iustin Pop | @param flag: operation flag
|
1707 | aa74b828 | Michael Hanselmann | @type blocking: bool
|
1708 | 58885d79 | Iustin Pop | @param blocking: whether the operation should be done in blocking mode.
|
1709 | aa74b828 | Michael Hanselmann | @type timeout: None or float
|
1710 | 58885d79 | Iustin Pop | @param timeout: for how long the operation should be retried (implies
|
1711 | aa74b828 | Michael Hanselmann | non-blocking mode).
|
1712 | aa74b828 | Michael Hanselmann | @type errmsg: string
|
1713 | 58885d79 | Iustin Pop | @param errmsg: error message in case operation fails.
|
1714 | aa74b828 | Michael Hanselmann |
|
1715 | aa74b828 | Michael Hanselmann | """
|
1716 | a87b4824 | Michael Hanselmann | assert self.fd, "Lock was closed" |
1717 | aa74b828 | Michael Hanselmann | assert timeout is None or timeout >= 0, \ |
1718 | aa74b828 | Michael Hanselmann | "If specified, timeout must be positive"
|
1719 | a87b4824 | Michael Hanselmann | |
1720 | aa74b828 | Michael Hanselmann | if timeout is not None: |
1721 | a87b4824 | Michael Hanselmann | flag |= fcntl.LOCK_NB |
1722 | aa74b828 | Michael Hanselmann | timeout_end = time.time() + timeout |
1723 | a87b4824 | Michael Hanselmann | |
1724 | aa74b828 | Michael Hanselmann | # Blocking doesn't have effect with timeout
|
1725 | aa74b828 | Michael Hanselmann | elif not blocking: |
1726 | aa74b828 | Michael Hanselmann | flag |= fcntl.LOCK_NB |
1727 | aa74b828 | Michael Hanselmann | timeout_end = None
|
1728 | aa74b828 | Michael Hanselmann | |
1729 | aa74b828 | Michael Hanselmann | retry = True
|
1730 | aa74b828 | Michael Hanselmann | while retry:
|
1731 | aa74b828 | Michael Hanselmann | try:
|
1732 | aa74b828 | Michael Hanselmann | fcntl.flock(self.fd, flag)
|
1733 | aa74b828 | Michael Hanselmann | retry = False
|
1734 | aa74b828 | Michael Hanselmann | except IOError, err: |
1735 | aa74b828 | Michael Hanselmann | if err.errno in (errno.EAGAIN, ): |
1736 | aa74b828 | Michael Hanselmann | if timeout_end is not None and time.time() < timeout_end: |
1737 | aa74b828 | Michael Hanselmann | # Wait before trying again
|
1738 | aa74b828 | Michael Hanselmann | time.sleep(max(0.1, min(1.0, timeout))) |
1739 | aa74b828 | Michael Hanselmann | else:
|
1740 | aa74b828 | Michael Hanselmann | raise errors.LockError(errmsg)
|
1741 | aa74b828 | Michael Hanselmann | else:
|
1742 | aa74b828 | Michael Hanselmann | logging.exception("fcntl.flock failed")
|
1743 | aa74b828 | Michael Hanselmann | raise
|
1744 | aa74b828 | Michael Hanselmann | |
1745 | aa74b828 | Michael Hanselmann | def Exclusive(self, blocking=False, timeout=None): |
1746 | a87b4824 | Michael Hanselmann | """Locks the file in exclusive mode.
|
1747 | a87b4824 | Michael Hanselmann |
|
1748 | 58885d79 | Iustin Pop | @type blocking: boolean
|
1749 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
1750 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
1751 | 58885d79 | Iustin Pop | @type timeout: int or None
|
1752 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
1753 | 58885d79 | Iustin Pop | (in blocking mode)
|
1754 | 58885d79 | Iustin Pop |
|
1755 | a87b4824 | Michael Hanselmann | """
|
1756 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_EX, blocking, timeout,
|
1757 | a87b4824 | Michael Hanselmann | "Failed to lock %s in exclusive mode" % self.filename) |
1758 | a87b4824 | Michael Hanselmann | |
1759 | aa74b828 | Michael Hanselmann | def Shared(self, blocking=False, timeout=None): |
1760 | a87b4824 | Michael Hanselmann | """Locks the file in shared mode.
|
1761 | a87b4824 | Michael Hanselmann |
|
1762 | 58885d79 | Iustin Pop | @type blocking: boolean
|
1763 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
1764 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
1765 | 58885d79 | Iustin Pop | @type timeout: int or None
|
1766 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
1767 | 58885d79 | Iustin Pop | (in blocking mode)
|
1768 | 58885d79 | Iustin Pop |
|
1769 | a87b4824 | Michael Hanselmann | """
|
1770 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_SH, blocking, timeout,
|
1771 | a87b4824 | Michael Hanselmann | "Failed to lock %s in shared mode" % self.filename) |
1772 | a87b4824 | Michael Hanselmann | |
1773 | aa74b828 | Michael Hanselmann | def Unlock(self, blocking=True, timeout=None): |
1774 | a87b4824 | Michael Hanselmann | """Unlocks the file.
|
1775 | a87b4824 | Michael Hanselmann |
|
1776 | 58885d79 | Iustin Pop | According to C{flock(2)}, unlocking can also be a nonblocking
|
1777 | 58885d79 | Iustin Pop | operation::
|
1778 | 58885d79 | Iustin Pop |
|
1779 | 58885d79 | Iustin Pop | To make a non-blocking request, include LOCK_NB with any of the above
|
1780 | 58885d79 | Iustin Pop | operations.
|
1781 | 58885d79 | Iustin Pop |
|
1782 | 58885d79 | Iustin Pop | @type blocking: boolean
|
1783 | 58885d79 | Iustin Pop | @param blocking: whether to block and wait until we
|
1784 | 58885d79 | Iustin Pop | can lock the file or return immediately
|
1785 | 58885d79 | Iustin Pop | @type timeout: int or None
|
1786 | 58885d79 | Iustin Pop | @param timeout: if not None, the duration to wait for the lock
|
1787 | 58885d79 | Iustin Pop | (in blocking mode)
|
1788 | a87b4824 | Michael Hanselmann |
|
1789 | a87b4824 | Michael Hanselmann | """
|
1790 | aa74b828 | Michael Hanselmann | self._flock(fcntl.LOCK_UN, blocking, timeout,
|
1791 | a87b4824 | Michael Hanselmann | "Failed to unlock %s" % self.filename) |
1792 | a87b4824 | Michael Hanselmann | |
1793 | a87b4824 | Michael Hanselmann | |
1794 | de499029 | Michael Hanselmann | class SignalHandler(object): |
1795 | de499029 | Michael Hanselmann | """Generic signal handler class.
|
1796 | de499029 | Michael Hanselmann |
|
1797 | 58885d79 | Iustin Pop | It automatically restores the original handler when deconstructed or
|
1798 | 58885d79 | Iustin Pop | when L{Reset} is called. You can either pass your own handler
|
1799 | 58885d79 | Iustin Pop | function in or query the L{called} attribute to detect whether the
|
1800 | 58885d79 | Iustin Pop | signal was sent.
|
1801 | 58885d79 | Iustin Pop |
|
1802 | 58885d79 | Iustin Pop | @type signum: list
|
1803 | 58885d79 | Iustin Pop | @ivar signum: the signals we handle
|
1804 | 58885d79 | Iustin Pop | @type called: boolean
|
1805 | 58885d79 | Iustin Pop | @ivar called: tracks whether any of the signals have been raised
|
1806 | de499029 | Michael Hanselmann |
|
1807 | de499029 | Michael Hanselmann | """
|
1808 | de499029 | Michael Hanselmann | def __init__(self, signum): |
1809 | de499029 | Michael Hanselmann | """Constructs a new SignalHandler instance.
|
1810 | de499029 | Michael Hanselmann |
|
1811 | 58885d79 | Iustin Pop | @type signum: int or list of ints
|
1812 | de499029 | Michael Hanselmann | @param signum: Single signal number or set of signal numbers
|
1813 | de499029 | Michael Hanselmann |
|
1814 | de499029 | Michael Hanselmann | """
|
1815 | de499029 | Michael Hanselmann | if isinstance(signum, (int, long)): |
1816 | de499029 | Michael Hanselmann | self.signum = set([signum]) |
1817 | de499029 | Michael Hanselmann | else:
|
1818 | de499029 | Michael Hanselmann | self.signum = set(signum) |
1819 | de499029 | Michael Hanselmann | |
1820 | de499029 | Michael Hanselmann | self.called = False |
1821 | de499029 | Michael Hanselmann | |
1822 | de499029 | Michael Hanselmann | self._previous = {}
|
1823 | de499029 | Michael Hanselmann | try:
|
1824 | de499029 | Michael Hanselmann | for signum in self.signum: |
1825 | de499029 | Michael Hanselmann | # Setup handler
|
1826 | de499029 | Michael Hanselmann | prev_handler = signal.signal(signum, self._HandleSignal)
|
1827 | de499029 | Michael Hanselmann | try:
|
1828 | de499029 | Michael Hanselmann | self._previous[signum] = prev_handler
|
1829 | de499029 | Michael Hanselmann | except:
|
1830 | de499029 | Michael Hanselmann | # Restore previous handler
|
1831 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
1832 | de499029 | Michael Hanselmann | raise
|
1833 | de499029 | Michael Hanselmann | except:
|
1834 | de499029 | Michael Hanselmann | # Reset all handlers
|
1835 | de499029 | Michael Hanselmann | self.Reset()
|
1836 | de499029 | Michael Hanselmann | # Here we have a race condition: a handler may have already been called,
|
1837 | de499029 | Michael Hanselmann | # but there's not much we can do about it at this point.
|
1838 | de499029 | Michael Hanselmann | raise
|
1839 | de499029 | Michael Hanselmann | |
1840 | de499029 | Michael Hanselmann | def __del__(self): |
1841 | de499029 | Michael Hanselmann | self.Reset()
|
1842 | de499029 | Michael Hanselmann | |
1843 | de499029 | Michael Hanselmann | def Reset(self): |
1844 | de499029 | Michael Hanselmann | """Restore previous handler.
|
1845 | de499029 | Michael Hanselmann |
|
1846 | 58885d79 | Iustin Pop | This will reset all the signals to their previous handlers.
|
1847 | 58885d79 | Iustin Pop |
|
1848 | de499029 | Michael Hanselmann | """
|
1849 | de499029 | Michael Hanselmann | for signum, prev_handler in self._previous.items(): |
1850 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
1851 | de499029 | Michael Hanselmann | # If successful, remove from dict
|
1852 | de499029 | Michael Hanselmann | del self._previous[signum] |
1853 | de499029 | Michael Hanselmann | |
1854 | de499029 | Michael Hanselmann | def Clear(self): |
1855 | 58885d79 | Iustin Pop | """Unsets the L{called} flag.
|
1856 | de499029 | Michael Hanselmann |
|
1857 | de499029 | Michael Hanselmann | This function can be used in case a signal may arrive several times.
|
1858 | de499029 | Michael Hanselmann |
|
1859 | de499029 | Michael Hanselmann | """
|
1860 | de499029 | Michael Hanselmann | self.called = False |
1861 | de499029 | Michael Hanselmann | |
1862 | de499029 | Michael Hanselmann | def _HandleSignal(self, signum, frame): |
1863 | de499029 | Michael Hanselmann | """Actual signal handling function.
|
1864 | de499029 | Michael Hanselmann |
|
1865 | de499029 | Michael Hanselmann | """
|
1866 | de499029 | Michael Hanselmann | # This is not nice and not absolutely atomic, but it appears to be the only
|
1867 | de499029 | Michael Hanselmann | # solution in Python -- there are no atomic types.
|
1868 | de499029 | Michael Hanselmann | self.called = True |
1869 | a2d2e1a7 | Iustin Pop | |
1870 | a2d2e1a7 | Iustin Pop | |
1871 | a2d2e1a7 | Iustin Pop | class FieldSet(object): |
1872 | a2d2e1a7 | Iustin Pop | """A simple field set.
|
1873 | a2d2e1a7 | Iustin Pop |
|
1874 | a2d2e1a7 | Iustin Pop | Among the features are:
|
1875 | a2d2e1a7 | Iustin Pop | - checking if a string is among a list of static string or regex objects
|
1876 | a2d2e1a7 | Iustin Pop | - checking if a whole list of string matches
|
1877 | a2d2e1a7 | Iustin Pop | - returning the matching groups from a regex match
|
1878 | a2d2e1a7 | Iustin Pop |
|
1879 | a2d2e1a7 | Iustin Pop | Internally, all fields are held as regular expression objects.
|
1880 | a2d2e1a7 | Iustin Pop |
|
1881 | a2d2e1a7 | Iustin Pop | """
|
1882 | a2d2e1a7 | Iustin Pop | def __init__(self, *items): |
1883 | a2d2e1a7 | Iustin Pop | self.items = [re.compile("^%s$" % value) for value in items] |
1884 | a2d2e1a7 | Iustin Pop | |
1885 | a2d2e1a7 | Iustin Pop | def Extend(self, other_set): |
1886 | a2d2e1a7 | Iustin Pop | """Extend the field set with the items from another one"""
|
1887 | a2d2e1a7 | Iustin Pop | self.items.extend(other_set.items)
|
1888 | a2d2e1a7 | Iustin Pop | |
1889 | a2d2e1a7 | Iustin Pop | def Matches(self, field): |
1890 | a2d2e1a7 | Iustin Pop | """Checks if a field matches the current set
|
1891 | a2d2e1a7 | Iustin Pop |
|
1892 | a2d2e1a7 | Iustin Pop | @type field: str
|
1893 | a2d2e1a7 | Iustin Pop | @param field: the string to match
|
1894 | a2d2e1a7 | Iustin Pop | @return: either False or a regular expression match object
|
1895 | a2d2e1a7 | Iustin Pop |
|
1896 | a2d2e1a7 | Iustin Pop | """
|
1897 | a2d2e1a7 | Iustin Pop | for m in itertools.ifilter(None, (val.match(field) for val in self.items)): |
1898 | a2d2e1a7 | Iustin Pop | return m
|
1899 | a2d2e1a7 | Iustin Pop | return False |
1900 | a2d2e1a7 | Iustin Pop | |
1901 | a2d2e1a7 | Iustin Pop | def NonMatching(self, items): |
1902 | a2d2e1a7 | Iustin Pop | """Returns the list of fields not matching the current set
|
1903 | a2d2e1a7 | Iustin Pop |
|
1904 | a2d2e1a7 | Iustin Pop | @type items: list
|
1905 | a2d2e1a7 | Iustin Pop | @param items: the list of fields to check
|
1906 | a2d2e1a7 | Iustin Pop | @rtype: list
|
1907 | a2d2e1a7 | Iustin Pop | @return: list of non-matching fields
|
1908 | a2d2e1a7 | Iustin Pop |
|
1909 | a2d2e1a7 | Iustin Pop | """
|
1910 | a2d2e1a7 | Iustin Pop | return [val for val in items if not self.Matches(val)] |