root / lib / utils / __init__.py @ 7d444d59
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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | 4fd029cf | Michael Hanselmann | # Copyright (C) 2006, 2007, 2010, 2011 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | 58885d79 | Iustin Pop | """Ganeti utility module.
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23 | 58885d79 | Iustin Pop |
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24 | 58885d79 | Iustin Pop | This module holds functions that can be used in both daemons (all) and
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25 | 58885d79 | Iustin Pop | the command line scripts.
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26 | 899d2a81 | Michael Hanselmann |
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27 | a8083063 | Iustin Pop | """
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28 | a8083063 | Iustin Pop | |
29 | a8083063 | Iustin Pop | |
30 | a8083063 | Iustin Pop | import os |
31 | c1dd99d4 | Michael Hanselmann | import sys |
32 | a8083063 | Iustin Pop | import time |
33 | 113b55aa | Iustin Pop | import subprocess |
34 | a8083063 | Iustin Pop | import re |
35 | a8083063 | Iustin Pop | import socket |
36 | a8083063 | Iustin Pop | import tempfile |
37 | a8083063 | Iustin Pop | import shutil |
38 | 4ca1b175 | Alexander Schreiber | import errno |
39 | 2f8b60b3 | Iustin Pop | import pwd |
40 | 78feb6fb | Guido Trotter | import itertools |
41 | 9c233417 | Iustin Pop | import select |
42 | 9c233417 | Iustin Pop | import fcntl |
43 | 8f765069 | Iustin Pop | import resource |
44 | bb698c1f | Iustin Pop | import logging |
45 | de499029 | Michael Hanselmann | import signal |
46 | 27e46076 | Michael Hanselmann | import datetime |
47 | 27e46076 | Michael Hanselmann | import calendar |
48 | 9c233417 | Iustin Pop | |
49 | 9c233417 | Iustin Pop | from cStringIO import StringIO |
50 | a8083063 | Iustin Pop | |
51 | a8083063 | Iustin Pop | from ganeti import errors |
52 | 3aecd2c7 | Iustin Pop | from ganeti import constants |
53 | 716a32cb | Guido Trotter | from ganeti import compat |
54 | a8083063 | Iustin Pop | |
55 | 4fd029cf | Michael Hanselmann | from ganeti.utils.algo import * # pylint: disable-msg=W0401 |
56 | 79d22269 | Michael Hanselmann | from ganeti.utils.retry import * # pylint: disable-msg=W0401 |
57 | 7fcffe27 | Michael Hanselmann | from ganeti.utils.text import * # pylint: disable-msg=W0401 |
58 | 36a4acd4 | Michael Hanselmann | from ganeti.utils.mlock import * # pylint: disable-msg=W0401 |
59 | 1ae4c5a1 | Michael Hanselmann | from ganeti.utils.log import * # pylint: disable-msg=W0401 |
60 | f21bb4b7 | Michael Hanselmann | from ganeti.utils.hash import * # pylint: disable-msg=W0401 |
61 | 7831fc5f | Michael Hanselmann | from ganeti.utils.wrapper import * # pylint: disable-msg=W0401 |
62 | 9d1b963f | Michael Hanselmann | from ganeti.utils.filelock import * # pylint: disable-msg=W0401 |
63 | 3865ca48 | Michael Hanselmann | from ganeti.utils.io import * # pylint: disable-msg=W0401 |
64 | c50645c0 | Michael Hanselmann | from ganeti.utils.x509 import * # pylint: disable-msg=W0401 |
65 | 17b97ab3 | Michael Hanselmann | from ganeti.utils.nodesetup import * # pylint: disable-msg=W0401 |
66 | 16abfbc2 | Alexander Schreiber | |
67 | 58885d79 | Iustin Pop | |
68 | 58885d79 | Iustin Pop | #: when set to True, L{RunCmd} is disabled
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69 | 7b4baeb1 | Michael Hanselmann | _no_fork = False
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70 | f362096f | Iustin Pop | |
71 | 13998ef2 | Michael Hanselmann | _RANDOM_UUID_FILE = "/proc/sys/kernel/random/uuid"
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72 | 13998ef2 | Michael Hanselmann | |
73 | 28f34048 | Michael Hanselmann | _VALID_SERVICE_NAME_RE = re.compile("^[-_.a-zA-Z0-9]{1,128}$")
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74 | 28f34048 | Michael Hanselmann | |
75 | 05636402 | Guido Trotter | UUID_RE = re.compile('^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-'
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76 | 05636402 | Guido Trotter | '[a-f0-9]{4}-[a-f0-9]{12}$')
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77 | 05636402 | Guido Trotter | |
78 | c74cda62 | René Nussbaumer | (_TIMEOUT_NONE, |
79 | c74cda62 | René Nussbaumer | _TIMEOUT_TERM, |
80 | c74cda62 | René Nussbaumer | _TIMEOUT_KILL) = range(3) |
81 | c74cda62 | René Nussbaumer | |
82 | 0b5303da | Iustin Pop | #: Shell param checker regexp
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83 | 0b5303da | Iustin Pop | _SHELLPARAM_REGEX = re.compile(r"^[-a-zA-Z0-9._+/:%@]+$")
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84 | 0b5303da | Iustin Pop | |
85 | 7c0d6283 | Michael Hanselmann | |
86 | 7b4baeb1 | Michael Hanselmann | def DisableFork(): |
87 | 7b4baeb1 | Michael Hanselmann | """Disables the use of fork(2).
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88 | 7b4baeb1 | Michael Hanselmann |
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89 | 7b4baeb1 | Michael Hanselmann | """
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90 | 7b4baeb1 | Michael Hanselmann | global _no_fork # pylint: disable-msg=W0603 |
91 | 7b4baeb1 | Michael Hanselmann | |
92 | 7b4baeb1 | Michael Hanselmann | _no_fork = True
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93 | 7b4baeb1 | Michael Hanselmann | |
94 | 7b4baeb1 | Michael Hanselmann | |
95 | a8083063 | Iustin Pop | class RunResult(object): |
96 | 58885d79 | Iustin Pop | """Holds the result of running external programs.
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97 | 58885d79 | Iustin Pop |
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98 | 58885d79 | Iustin Pop | @type exit_code: int
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99 | 58885d79 | Iustin Pop | @ivar exit_code: the exit code of the program, or None (if the program
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100 | 58885d79 | Iustin Pop | didn't exit())
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101 | 58885d79 | Iustin Pop | @type signal: int or None
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102 | 58885d79 | Iustin Pop | @ivar signal: the signal that caused the program to finish, or None
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103 | 58885d79 | Iustin Pop | (if the program wasn't terminated by a signal)
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104 | 58885d79 | Iustin Pop | @type stdout: str
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105 | 58885d79 | Iustin Pop | @ivar stdout: the standard output of the program
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106 | 58885d79 | Iustin Pop | @type stderr: str
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107 | 58885d79 | Iustin Pop | @ivar stderr: the standard error of the program
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108 | 58885d79 | Iustin Pop | @type failed: boolean
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109 | 58885d79 | Iustin Pop | @ivar failed: True in case the program was
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110 | 58885d79 | Iustin Pop | terminated by a signal or exited with a non-zero exit code
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111 | 58885d79 | Iustin Pop | @ivar fail_reason: a string detailing the termination reason
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112 | a8083063 | Iustin Pop |
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113 | a8083063 | Iustin Pop | """
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114 | a8083063 | Iustin Pop | __slots__ = ["exit_code", "signal", "stdout", "stderr", |
115 | a8083063 | Iustin Pop | "failed", "fail_reason", "cmd"] |
116 | a8083063 | Iustin Pop | |
117 | a8083063 | Iustin Pop | |
118 | c74cda62 | René Nussbaumer | def __init__(self, exit_code, signal_, stdout, stderr, cmd, timeout_action, |
119 | c74cda62 | René Nussbaumer | timeout): |
120 | a8083063 | Iustin Pop | self.cmd = cmd
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121 | a8083063 | Iustin Pop | self.exit_code = exit_code
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122 | 38206f3c | Iustin Pop | self.signal = signal_
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123 | a8083063 | Iustin Pop | self.stdout = stdout
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124 | a8083063 | Iustin Pop | self.stderr = stderr
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125 | 38206f3c | Iustin Pop | self.failed = (signal_ is not None or exit_code != 0) |
126 | a8083063 | Iustin Pop | |
127 | c74cda62 | René Nussbaumer | fail_msgs = [] |
128 | a8083063 | Iustin Pop | if self.signal is not None: |
129 | c74cda62 | René Nussbaumer | fail_msgs.append("terminated by signal %s" % self.signal) |
130 | a8083063 | Iustin Pop | elif self.exit_code is not None: |
131 | c74cda62 | René Nussbaumer | fail_msgs.append("exited with exit code %s" % self.exit_code) |
132 | a8083063 | Iustin Pop | else:
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133 | c74cda62 | René Nussbaumer | fail_msgs.append("unable to determine termination reason")
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134 | c74cda62 | René Nussbaumer | |
135 | c74cda62 | René Nussbaumer | if timeout_action == _TIMEOUT_TERM:
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136 | c74cda62 | René Nussbaumer | fail_msgs.append("terminated after timeout of %.2f seconds" % timeout)
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137 | c74cda62 | René Nussbaumer | elif timeout_action == _TIMEOUT_KILL:
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138 | c74cda62 | René Nussbaumer | fail_msgs.append(("force termination after timeout of %.2f seconds"
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139 | c74cda62 | René Nussbaumer | " and linger for another %.2f seconds") %
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140 | c74cda62 | René Nussbaumer | (timeout, constants.CHILD_LINGER_TIMEOUT)) |
141 | c74cda62 | René Nussbaumer | |
142 | c74cda62 | René Nussbaumer | if fail_msgs and self.failed: |
143 | c74cda62 | René Nussbaumer | self.fail_reason = CommaJoin(fail_msgs)
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144 | a8083063 | Iustin Pop | |
145 | bb698c1f | Iustin Pop | if self.failed: |
146 | bb698c1f | Iustin Pop | logging.debug("Command '%s' failed (%s); output: %s",
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147 | bb698c1f | Iustin Pop | self.cmd, self.fail_reason, self.output) |
148 | f362096f | Iustin Pop | |
149 | a8083063 | Iustin Pop | def _GetOutput(self): |
150 | a8083063 | Iustin Pop | """Returns the combined stdout and stderr for easier usage.
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151 | a8083063 | Iustin Pop |
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152 | a8083063 | Iustin Pop | """
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153 | a8083063 | Iustin Pop | return self.stdout + self.stderr |
154 | a8083063 | Iustin Pop | |
155 | a8083063 | Iustin Pop | output = property(_GetOutput, None, None, "Return full output") |
156 | a8083063 | Iustin Pop | |
157 | a8083063 | Iustin Pop | |
158 | bb3776b4 | Michael Hanselmann | def _BuildCmdEnvironment(env, reset): |
159 | c1dd99d4 | Michael Hanselmann | """Builds the environment for an external program.
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160 | c1dd99d4 | Michael Hanselmann |
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161 | c1dd99d4 | Michael Hanselmann | """
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162 | bb3776b4 | Michael Hanselmann | if reset:
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163 | bb3776b4 | Michael Hanselmann | cmd_env = {} |
164 | bb3776b4 | Michael Hanselmann | else:
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165 | bb3776b4 | Michael Hanselmann | cmd_env = os.environ.copy() |
166 | bb3776b4 | Michael Hanselmann | cmd_env["LC_ALL"] = "C" |
167 | bb3776b4 | Michael Hanselmann | |
168 | c1dd99d4 | Michael Hanselmann | if env is not None: |
169 | c1dd99d4 | Michael Hanselmann | cmd_env.update(env) |
170 | bb3776b4 | Michael Hanselmann | |
171 | c1dd99d4 | Michael Hanselmann | return cmd_env
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172 | c1dd99d4 | Michael Hanselmann | |
173 | c1dd99d4 | Michael Hanselmann | |
174 | 0963d545 | René Nussbaumer | def RunCmd(cmd, env=None, output=None, cwd="/", reset_env=False, |
175 | c74cda62 | René Nussbaumer | interactive=False, timeout=None): |
176 | a8083063 | Iustin Pop | """Execute a (shell) command.
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177 | a8083063 | Iustin Pop |
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178 | a8083063 | Iustin Pop | The command should not read from its standard input, as it will be
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179 | a8083063 | Iustin Pop | closed.
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180 | a8083063 | Iustin Pop |
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181 | c1dd99d4 | Michael Hanselmann | @type cmd: string or list
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182 | 36117c2b | Iustin Pop | @param cmd: Command to run
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183 | 2557ff82 | Guido Trotter | @type env: dict
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184 | c1dd99d4 | Michael Hanselmann | @param env: Additional environment variables
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185 | 36117c2b | Iustin Pop | @type output: str
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186 | 58885d79 | Iustin Pop | @param output: if desired, the output of the command can be
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187 | 36117c2b | Iustin Pop | saved in a file instead of the RunResult instance; this
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188 | 36117c2b | Iustin Pop | parameter denotes the file name (if not None)
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189 | 8797df43 | Iustin Pop | @type cwd: string
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190 | 8797df43 | Iustin Pop | @param cwd: if specified, will be used as the working
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191 | 8797df43 | Iustin Pop | directory for the command; the default will be /
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192 | bf4daac9 | Guido Trotter | @type reset_env: boolean
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193 | bf4daac9 | Guido Trotter | @param reset_env: whether to reset or keep the default os environment
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194 | 0963d545 | René Nussbaumer | @type interactive: boolean
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195 | 0963d545 | René Nussbaumer | @param interactive: weather we pipe stdin, stdout and stderr
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196 | 0963d545 | René Nussbaumer | (default behaviour) or run the command interactive
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197 | c74cda62 | René Nussbaumer | @type timeout: int
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198 | c74cda62 | René Nussbaumer | @param timeout: If not None, timeout in seconds until child process gets
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199 | c74cda62 | René Nussbaumer | killed
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200 | 36117c2b | Iustin Pop | @rtype: L{RunResult}
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201 | 58885d79 | Iustin Pop | @return: RunResult instance
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202 | 5bbd3f7f | Michael Hanselmann | @raise errors.ProgrammerError: if we call this when forks are disabled
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203 | a8083063 | Iustin Pop |
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204 | a8083063 | Iustin Pop | """
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205 | 7b4baeb1 | Michael Hanselmann | if _no_fork:
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206 | b74159ee | Iustin Pop | raise errors.ProgrammerError("utils.RunCmd() called with fork() disabled") |
207 | b74159ee | Iustin Pop | |
208 | 0963d545 | René Nussbaumer | if output and interactive: |
209 | 0963d545 | René Nussbaumer | raise errors.ProgrammerError("Parameters 'output' and 'interactive' can" |
210 | 0963d545 | René Nussbaumer | " not be provided at the same time")
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211 | 0963d545 | René Nussbaumer | |
212 | c1dd99d4 | Michael Hanselmann | if isinstance(cmd, basestring): |
213 | c1dd99d4 | Michael Hanselmann | strcmd = cmd |
214 | c1dd99d4 | Michael Hanselmann | shell = True
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215 | c1dd99d4 | Michael Hanselmann | else:
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216 | a8083063 | Iustin Pop | cmd = [str(val) for val in cmd] |
217 | c1dd99d4 | Michael Hanselmann | strcmd = ShellQuoteArgs(cmd) |
218 | 113b55aa | Iustin Pop | shell = False
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219 | c1dd99d4 | Michael Hanselmann | |
220 | c1dd99d4 | Michael Hanselmann | if output:
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221 | c1dd99d4 | Michael Hanselmann | logging.debug("RunCmd %s, output file '%s'", strcmd, output)
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222 | 113b55aa | Iustin Pop | else:
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223 | c1dd99d4 | Michael Hanselmann | logging.debug("RunCmd %s", strcmd)
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224 | 2557ff82 | Guido Trotter | |
225 | bb3776b4 | Michael Hanselmann | cmd_env = _BuildCmdEnvironment(env, reset_env) |
226 | 2557ff82 | Guido Trotter | |
227 | c803b052 | Iustin Pop | try:
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228 | c803b052 | Iustin Pop | if output is None: |
229 | c74cda62 | René Nussbaumer | out, err, status, timeout_action = _RunCmdPipe(cmd, cmd_env, shell, cwd, |
230 | c74cda62 | René Nussbaumer | interactive, timeout) |
231 | c803b052 | Iustin Pop | else:
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232 | c74cda62 | René Nussbaumer | timeout_action = _TIMEOUT_NONE |
233 | c803b052 | Iustin Pop | status = _RunCmdFile(cmd, cmd_env, shell, output, cwd) |
234 | c803b052 | Iustin Pop | out = err = ""
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235 | c803b052 | Iustin Pop | except OSError, err: |
236 | c803b052 | Iustin Pop | if err.errno == errno.ENOENT:
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237 | c803b052 | Iustin Pop | raise errors.OpExecError("Can't execute '%s': not found (%s)" % |
238 | c803b052 | Iustin Pop | (strcmd, err)) |
239 | c803b052 | Iustin Pop | else:
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240 | c803b052 | Iustin Pop | raise
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241 | 36117c2b | Iustin Pop | |
242 | 36117c2b | Iustin Pop | if status >= 0: |
243 | 36117c2b | Iustin Pop | exitcode = status |
244 | 36117c2b | Iustin Pop | signal_ = None
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245 | 36117c2b | Iustin Pop | else:
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246 | 36117c2b | Iustin Pop | exitcode = None
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247 | 36117c2b | Iustin Pop | signal_ = -status |
248 | 36117c2b | Iustin Pop | |
249 | c74cda62 | René Nussbaumer | return RunResult(exitcode, signal_, out, err, strcmd, timeout_action, timeout)
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250 | 36117c2b | Iustin Pop | |
251 | ae59efea | Michael Hanselmann | |
252 | 0260032c | Iustin Pop | def SetupDaemonEnv(cwd="/", umask=077): |
253 | 0260032c | Iustin Pop | """Setup a daemon's environment.
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254 | 0260032c | Iustin Pop |
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255 | 0260032c | Iustin Pop | This should be called between the first and second fork, due to
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256 | 0260032c | Iustin Pop | setsid usage.
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257 | 0260032c | Iustin Pop |
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258 | 0260032c | Iustin Pop | @param cwd: the directory to which to chdir
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259 | 0260032c | Iustin Pop | @param umask: the umask to setup
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260 | 0260032c | Iustin Pop |
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261 | 0260032c | Iustin Pop | """
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262 | 0260032c | Iustin Pop | os.chdir(cwd) |
263 | 0260032c | Iustin Pop | os.umask(umask) |
264 | 0260032c | Iustin Pop | os.setsid() |
265 | 0260032c | Iustin Pop | |
266 | 0260032c | Iustin Pop | |
267 | 79634555 | Iustin Pop | def SetupDaemonFDs(output_file, output_fd): |
268 | 79634555 | Iustin Pop | """Setups up a daemon's file descriptors.
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269 | 79634555 | Iustin Pop |
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270 | 79634555 | Iustin Pop | @param output_file: if not None, the file to which to redirect
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271 | 79634555 | Iustin Pop | stdout/stderr
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272 | 79634555 | Iustin Pop | @param output_fd: if not None, the file descriptor for stdout/stderr
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273 | 79634555 | Iustin Pop |
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274 | 79634555 | Iustin Pop | """
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275 | 79634555 | Iustin Pop | # check that at most one is defined
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276 | 79634555 | Iustin Pop | assert [output_file, output_fd].count(None) >= 1 |
277 | 79634555 | Iustin Pop | |
278 | 79634555 | Iustin Pop | # Open /dev/null (read-only, only for stdin)
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279 | 79634555 | Iustin Pop | devnull_fd = os.open(os.devnull, os.O_RDONLY) |
280 | 79634555 | Iustin Pop | |
281 | 79634555 | Iustin Pop | if output_fd is not None: |
282 | 79634555 | Iustin Pop | pass
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283 | 79634555 | Iustin Pop | elif output_file is not None: |
284 | 79634555 | Iustin Pop | # Open output file
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285 | 79634555 | Iustin Pop | try:
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286 | 79634555 | Iustin Pop | output_fd = os.open(output_file, |
287 | 79634555 | Iustin Pop | os.O_WRONLY | os.O_CREAT | os.O_APPEND, 0600)
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288 | 79634555 | Iustin Pop | except EnvironmentError, err: |
289 | 79634555 | Iustin Pop | raise Exception("Opening output file failed: %s" % err) |
290 | 79634555 | Iustin Pop | else:
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291 | 79634555 | Iustin Pop | output_fd = os.open(os.devnull, os.O_WRONLY) |
292 | 79634555 | Iustin Pop | |
293 | 79634555 | Iustin Pop | # Redirect standard I/O
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294 | 79634555 | Iustin Pop | os.dup2(devnull_fd, 0)
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295 | 79634555 | Iustin Pop | os.dup2(output_fd, 1)
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296 | 79634555 | Iustin Pop | os.dup2(output_fd, 2)
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297 | 79634555 | Iustin Pop | |
298 | 79634555 | Iustin Pop | |
299 | c1dd99d4 | Michael Hanselmann | def StartDaemon(cmd, env=None, cwd="/", output=None, output_fd=None, |
300 | c1dd99d4 | Michael Hanselmann | pidfile=None):
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301 | c1dd99d4 | Michael Hanselmann | """Start a daemon process after forking twice.
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302 | c1dd99d4 | Michael Hanselmann |
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303 | c1dd99d4 | Michael Hanselmann | @type cmd: string or list
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304 | c1dd99d4 | Michael Hanselmann | @param cmd: Command to run
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305 | c1dd99d4 | Michael Hanselmann | @type env: dict
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306 | c1dd99d4 | Michael Hanselmann | @param env: Additional environment variables
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307 | c1dd99d4 | Michael Hanselmann | @type cwd: string
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308 | c1dd99d4 | Michael Hanselmann | @param cwd: Working directory for the program
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309 | c1dd99d4 | Michael Hanselmann | @type output: string
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310 | c1dd99d4 | Michael Hanselmann | @param output: Path to file in which to save the output
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311 | c1dd99d4 | Michael Hanselmann | @type output_fd: int
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312 | c1dd99d4 | Michael Hanselmann | @param output_fd: File descriptor for output
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313 | c1dd99d4 | Michael Hanselmann | @type pidfile: string
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314 | c1dd99d4 | Michael Hanselmann | @param pidfile: Process ID file
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315 | c1dd99d4 | Michael Hanselmann | @rtype: int
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316 | c1dd99d4 | Michael Hanselmann | @return: Daemon process ID
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317 | c1dd99d4 | Michael Hanselmann | @raise errors.ProgrammerError: if we call this when forks are disabled
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318 | c1dd99d4 | Michael Hanselmann |
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319 | c1dd99d4 | Michael Hanselmann | """
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320 | 7b4baeb1 | Michael Hanselmann | if _no_fork:
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321 | c1dd99d4 | Michael Hanselmann | raise errors.ProgrammerError("utils.StartDaemon() called with fork()" |
322 | c1dd99d4 | Michael Hanselmann | " disabled")
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323 | c1dd99d4 | Michael Hanselmann | |
324 | c1dd99d4 | Michael Hanselmann | if output and not (bool(output) ^ (output_fd is not None)): |
325 | c1dd99d4 | Michael Hanselmann | raise errors.ProgrammerError("Only one of 'output' and 'output_fd' can be" |
326 | c1dd99d4 | Michael Hanselmann | " specified")
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327 | c1dd99d4 | Michael Hanselmann | |
328 | c1dd99d4 | Michael Hanselmann | if isinstance(cmd, basestring): |
329 | c1dd99d4 | Michael Hanselmann | cmd = ["/bin/sh", "-c", cmd] |
330 | c1dd99d4 | Michael Hanselmann | |
331 | c1dd99d4 | Michael Hanselmann | strcmd = ShellQuoteArgs(cmd) |
332 | c1dd99d4 | Michael Hanselmann | |
333 | c1dd99d4 | Michael Hanselmann | if output:
|
334 | c1dd99d4 | Michael Hanselmann | logging.debug("StartDaemon %s, output file '%s'", strcmd, output)
|
335 | c1dd99d4 | Michael Hanselmann | else:
|
336 | c1dd99d4 | Michael Hanselmann | logging.debug("StartDaemon %s", strcmd)
|
337 | c1dd99d4 | Michael Hanselmann | |
338 | bb3776b4 | Michael Hanselmann | cmd_env = _BuildCmdEnvironment(env, False)
|
339 | c1dd99d4 | Michael Hanselmann | |
340 | c1dd99d4 | Michael Hanselmann | # Create pipe for sending PID back
|
341 | c1dd99d4 | Michael Hanselmann | (pidpipe_read, pidpipe_write) = os.pipe() |
342 | c1dd99d4 | Michael Hanselmann | try:
|
343 | c1dd99d4 | Michael Hanselmann | try:
|
344 | c1dd99d4 | Michael Hanselmann | # Create pipe for sending error messages
|
345 | c1dd99d4 | Michael Hanselmann | (errpipe_read, errpipe_write) = os.pipe() |
346 | c1dd99d4 | Michael Hanselmann | try:
|
347 | c1dd99d4 | Michael Hanselmann | try:
|
348 | c1dd99d4 | Michael Hanselmann | # First fork
|
349 | c1dd99d4 | Michael Hanselmann | pid = os.fork() |
350 | c1dd99d4 | Michael Hanselmann | if pid == 0: |
351 | c1dd99d4 | Michael Hanselmann | try:
|
352 | c1dd99d4 | Michael Hanselmann | # Child process, won't return
|
353 | e0bb431e | Michael Hanselmann | _StartDaemonChild(errpipe_read, errpipe_write, |
354 | e0bb431e | Michael Hanselmann | pidpipe_read, pidpipe_write, |
355 | e0bb431e | Michael Hanselmann | cmd, cmd_env, cwd, |
356 | e0bb431e | Michael Hanselmann | output, output_fd, pidfile) |
357 | c1dd99d4 | Michael Hanselmann | finally:
|
358 | c1dd99d4 | Michael Hanselmann | # Well, maybe child process failed
|
359 | e0bb431e | Michael Hanselmann | os._exit(1) # pylint: disable-msg=W0212 |
360 | c1dd99d4 | Michael Hanselmann | finally:
|
361 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(errpipe_write) |
362 | c1dd99d4 | Michael Hanselmann | |
363 | b78aa8c2 | Iustin Pop | # Wait for daemon to be started (or an error message to
|
364 | b78aa8c2 | Iustin Pop | # arrive) and read up to 100 KB as an error message
|
365 | c1dd99d4 | Michael Hanselmann | errormsg = RetryOnSignal(os.read, errpipe_read, 100 * 1024) |
366 | c1dd99d4 | Michael Hanselmann | finally:
|
367 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(errpipe_read) |
368 | c1dd99d4 | Michael Hanselmann | finally:
|
369 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(pidpipe_write) |
370 | c1dd99d4 | Michael Hanselmann | |
371 | c1dd99d4 | Michael Hanselmann | # Read up to 128 bytes for PID
|
372 | c1dd99d4 | Michael Hanselmann | pidtext = RetryOnSignal(os.read, pidpipe_read, 128)
|
373 | c1dd99d4 | Michael Hanselmann | finally:
|
374 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(pidpipe_read) |
375 | c1dd99d4 | Michael Hanselmann | |
376 | c1dd99d4 | Michael Hanselmann | # Try to avoid zombies by waiting for child process
|
377 | c1dd99d4 | Michael Hanselmann | try:
|
378 | c1dd99d4 | Michael Hanselmann | os.waitpid(pid, 0)
|
379 | c1dd99d4 | Michael Hanselmann | except OSError: |
380 | c1dd99d4 | Michael Hanselmann | pass
|
381 | c1dd99d4 | Michael Hanselmann | |
382 | c1dd99d4 | Michael Hanselmann | if errormsg:
|
383 | c1dd99d4 | Michael Hanselmann | raise errors.OpExecError("Error when starting daemon process: %r" % |
384 | c1dd99d4 | Michael Hanselmann | errormsg) |
385 | c1dd99d4 | Michael Hanselmann | |
386 | c1dd99d4 | Michael Hanselmann | try:
|
387 | c1dd99d4 | Michael Hanselmann | return int(pidtext) |
388 | c1dd99d4 | Michael Hanselmann | except (ValueError, TypeError), err: |
389 | c1dd99d4 | Michael Hanselmann | raise errors.OpExecError("Error while trying to parse PID %r: %s" % |
390 | c1dd99d4 | Michael Hanselmann | (pidtext, err)) |
391 | c1dd99d4 | Michael Hanselmann | |
392 | c1dd99d4 | Michael Hanselmann | |
393 | e0bb431e | Michael Hanselmann | def _StartDaemonChild(errpipe_read, errpipe_write, |
394 | e0bb431e | Michael Hanselmann | pidpipe_read, pidpipe_write, |
395 | e0bb431e | Michael Hanselmann | args, env, cwd, |
396 | e0bb431e | Michael Hanselmann | output, fd_output, pidfile): |
397 | c1dd99d4 | Michael Hanselmann | """Child process for starting daemon.
|
398 | c1dd99d4 | Michael Hanselmann |
|
399 | c1dd99d4 | Michael Hanselmann | """
|
400 | c1dd99d4 | Michael Hanselmann | try:
|
401 | c1dd99d4 | Michael Hanselmann | # Close parent's side
|
402 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(errpipe_read) |
403 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(pidpipe_read) |
404 | c1dd99d4 | Michael Hanselmann | |
405 | c1dd99d4 | Michael Hanselmann | # First child process
|
406 | 0260032c | Iustin Pop | SetupDaemonEnv() |
407 | c1dd99d4 | Michael Hanselmann | |
408 | c1dd99d4 | Michael Hanselmann | # And fork for the second time
|
409 | c1dd99d4 | Michael Hanselmann | pid = os.fork() |
410 | c1dd99d4 | Michael Hanselmann | if pid != 0: |
411 | c1dd99d4 | Michael Hanselmann | # Exit first child process
|
412 | c1dd99d4 | Michael Hanselmann | os._exit(0) # pylint: disable-msg=W0212 |
413 | c1dd99d4 | Michael Hanselmann | |
414 | 0260032c | Iustin Pop | # Make sure pipe is closed on execv* (and thereby notifies
|
415 | 0260032c | Iustin Pop | # original process)
|
416 | c1dd99d4 | Michael Hanselmann | SetCloseOnExecFlag(errpipe_write, True)
|
417 | c1dd99d4 | Michael Hanselmann | |
418 | c1dd99d4 | Michael Hanselmann | # List of file descriptors to be left open
|
419 | c1dd99d4 | Michael Hanselmann | noclose_fds = [errpipe_write] |
420 | c1dd99d4 | Michael Hanselmann | |
421 | c1dd99d4 | Michael Hanselmann | # Open PID file
|
422 | c1dd99d4 | Michael Hanselmann | if pidfile:
|
423 | 5c4d37f9 | Iustin Pop | fd_pidfile = WritePidFile(pidfile) |
424 | c1dd99d4 | Michael Hanselmann | |
425 | c1dd99d4 | Michael Hanselmann | # Keeping the file open to hold the lock
|
426 | c1dd99d4 | Michael Hanselmann | noclose_fds.append(fd_pidfile) |
427 | c1dd99d4 | Michael Hanselmann | |
428 | c1dd99d4 | Michael Hanselmann | SetCloseOnExecFlag(fd_pidfile, False)
|
429 | c1dd99d4 | Michael Hanselmann | else:
|
430 | c1dd99d4 | Michael Hanselmann | fd_pidfile = None
|
431 | c1dd99d4 | Michael Hanselmann | |
432 | 79634555 | Iustin Pop | SetupDaemonFDs(output, fd_output) |
433 | c1dd99d4 | Michael Hanselmann | |
434 | c1dd99d4 | Michael Hanselmann | # Send daemon PID to parent
|
435 | c1dd99d4 | Michael Hanselmann | RetryOnSignal(os.write, pidpipe_write, str(os.getpid()))
|
436 | c1dd99d4 | Michael Hanselmann | |
437 | c1dd99d4 | Michael Hanselmann | # Close all file descriptors except stdio and error message pipe
|
438 | c1dd99d4 | Michael Hanselmann | CloseFDs(noclose_fds=noclose_fds) |
439 | c1dd99d4 | Michael Hanselmann | |
440 | c1dd99d4 | Michael Hanselmann | # Change working directory
|
441 | c1dd99d4 | Michael Hanselmann | os.chdir(cwd) |
442 | c1dd99d4 | Michael Hanselmann | |
443 | c1dd99d4 | Michael Hanselmann | if env is None: |
444 | c1dd99d4 | Michael Hanselmann | os.execvp(args[0], args)
|
445 | c1dd99d4 | Michael Hanselmann | else:
|
446 | c1dd99d4 | Michael Hanselmann | os.execvpe(args[0], args, env)
|
447 | c1dd99d4 | Michael Hanselmann | except: # pylint: disable-msg=W0702 |
448 | c1dd99d4 | Michael Hanselmann | try:
|
449 | c1dd99d4 | Michael Hanselmann | # Report errors to original process
|
450 | ed3920e3 | Iustin Pop | WriteErrorToFD(errpipe_write, str(sys.exc_info()[1])) |
451 | c1dd99d4 | Michael Hanselmann | except: # pylint: disable-msg=W0702 |
452 | c1dd99d4 | Michael Hanselmann | # Ignore errors in error handling
|
453 | c1dd99d4 | Michael Hanselmann | pass
|
454 | c1dd99d4 | Michael Hanselmann | |
455 | c1dd99d4 | Michael Hanselmann | os._exit(1) # pylint: disable-msg=W0212 |
456 | c1dd99d4 | Michael Hanselmann | |
457 | c1dd99d4 | Michael Hanselmann | |
458 | ed3920e3 | Iustin Pop | def WriteErrorToFD(fd, err): |
459 | ed3920e3 | Iustin Pop | """Possibly write an error message to a fd.
|
460 | ed3920e3 | Iustin Pop |
|
461 | ed3920e3 | Iustin Pop | @type fd: None or int (file descriptor)
|
462 | ed3920e3 | Iustin Pop | @param fd: if not None, the error will be written to this fd
|
463 | ed3920e3 | Iustin Pop | @param err: string, the error message
|
464 | ed3920e3 | Iustin Pop |
|
465 | ed3920e3 | Iustin Pop | """
|
466 | ed3920e3 | Iustin Pop | if fd is None: |
467 | ed3920e3 | Iustin Pop | return
|
468 | ed3920e3 | Iustin Pop | |
469 | ed3920e3 | Iustin Pop | if not err: |
470 | ed3920e3 | Iustin Pop | err = "<unknown error>"
|
471 | ed3920e3 | Iustin Pop | |
472 | ed3920e3 | Iustin Pop | RetryOnSignal(os.write, fd, err) |
473 | ed3920e3 | Iustin Pop | |
474 | ed3920e3 | Iustin Pop | |
475 | c74cda62 | René Nussbaumer | def _CheckIfAlive(child): |
476 | c74cda62 | René Nussbaumer | """Raises L{RetryAgain} if child is still alive.
|
477 | c74cda62 | René Nussbaumer |
|
478 | c74cda62 | René Nussbaumer | @raises RetryAgain: If child is still alive
|
479 | c74cda62 | René Nussbaumer |
|
480 | c74cda62 | René Nussbaumer | """
|
481 | c74cda62 | René Nussbaumer | if child.poll() is None: |
482 | c74cda62 | René Nussbaumer | raise RetryAgain()
|
483 | c74cda62 | René Nussbaumer | |
484 | c74cda62 | René Nussbaumer | |
485 | c74cda62 | René Nussbaumer | def _WaitForProcess(child, timeout): |
486 | c74cda62 | René Nussbaumer | """Waits for the child to terminate or until we reach timeout.
|
487 | c74cda62 | René Nussbaumer |
|
488 | c74cda62 | René Nussbaumer | """
|
489 | c74cda62 | René Nussbaumer | try:
|
490 | c74cda62 | René Nussbaumer | Retry(_CheckIfAlive, (1.0, 1.2, 5.0), max(0, timeout), args=[child]) |
491 | c74cda62 | René Nussbaumer | except RetryTimeout:
|
492 | c74cda62 | René Nussbaumer | pass
|
493 | c74cda62 | René Nussbaumer | |
494 | c74cda62 | René Nussbaumer | |
495 | c74cda62 | René Nussbaumer | def _RunCmdPipe(cmd, env, via_shell, cwd, interactive, timeout, |
496 | c74cda62 | René Nussbaumer | _linger_timeout=constants.CHILD_LINGER_TIMEOUT): |
497 | 36117c2b | Iustin Pop | """Run a command and return its output.
|
498 | 36117c2b | Iustin Pop |
|
499 | 36117c2b | Iustin Pop | @type cmd: string or list
|
500 | 36117c2b | Iustin Pop | @param cmd: Command to run
|
501 | 36117c2b | Iustin Pop | @type env: dict
|
502 | 36117c2b | Iustin Pop | @param env: The environment to use
|
503 | 36117c2b | Iustin Pop | @type via_shell: bool
|
504 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
|
505 | 8797df43 | Iustin Pop | @type cwd: string
|
506 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
|
507 | 0963d545 | René Nussbaumer | @type interactive: boolean
|
508 | 0963d545 | René Nussbaumer | @param interactive: Run command interactive (without piping)
|
509 | c74cda62 | René Nussbaumer | @type timeout: int
|
510 | c74cda62 | René Nussbaumer | @param timeout: Timeout after the programm gets terminated
|
511 | 36117c2b | Iustin Pop | @rtype: tuple
|
512 | 36117c2b | Iustin Pop | @return: (out, err, status)
|
513 | 36117c2b | Iustin Pop |
|
514 | 36117c2b | Iustin Pop | """
|
515 | 9c233417 | Iustin Pop | poller = select.poll() |
516 | 0963d545 | René Nussbaumer | |
517 | 0963d545 | René Nussbaumer | stderr = subprocess.PIPE |
518 | 0963d545 | René Nussbaumer | stdout = subprocess.PIPE |
519 | 0963d545 | René Nussbaumer | stdin = subprocess.PIPE |
520 | 0963d545 | René Nussbaumer | |
521 | 0963d545 | René Nussbaumer | if interactive:
|
522 | 0963d545 | René Nussbaumer | stderr = stdout = stdin = None
|
523 | 0963d545 | René Nussbaumer | |
524 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
525 | 0963d545 | René Nussbaumer | stderr=stderr, |
526 | 0963d545 | René Nussbaumer | stdout=stdout, |
527 | 0963d545 | René Nussbaumer | stdin=stdin, |
528 | 8797df43 | Iustin Pop | close_fds=True, env=env,
|
529 | 8797df43 | Iustin Pop | cwd=cwd) |
530 | 113b55aa | Iustin Pop | |
531 | 9c233417 | Iustin Pop | out = StringIO() |
532 | 9c233417 | Iustin Pop | err = StringIO() |
533 | c74cda62 | René Nussbaumer | |
534 | c74cda62 | René Nussbaumer | linger_timeout = None
|
535 | c74cda62 | René Nussbaumer | |
536 | c74cda62 | René Nussbaumer | if timeout is None: |
537 | c74cda62 | René Nussbaumer | poll_timeout = None
|
538 | c74cda62 | René Nussbaumer | else:
|
539 | c74cda62 | René Nussbaumer | poll_timeout = RunningTimeout(timeout, True).Remaining
|
540 | c74cda62 | René Nussbaumer | |
541 | c74cda62 | René Nussbaumer | msg_timeout = ("Command %s (%d) run into execution timeout, terminating" %
|
542 | c74cda62 | René Nussbaumer | (cmd, child.pid)) |
543 | c74cda62 | René Nussbaumer | msg_linger = ("Command %s (%d) run into linger timeout, killing" %
|
544 | c74cda62 | René Nussbaumer | (cmd, child.pid)) |
545 | c74cda62 | René Nussbaumer | |
546 | c74cda62 | René Nussbaumer | timeout_action = _TIMEOUT_NONE |
547 | c74cda62 | René Nussbaumer | |
548 | 0963d545 | René Nussbaumer | if not interactive: |
549 | 0963d545 | René Nussbaumer | child.stdin.close() |
550 | 0963d545 | René Nussbaumer | poller.register(child.stdout, select.POLLIN) |
551 | 0963d545 | René Nussbaumer | poller.register(child.stderr, select.POLLIN) |
552 | 0963d545 | René Nussbaumer | fdmap = { |
553 | 0963d545 | René Nussbaumer | child.stdout.fileno(): (out, child.stdout), |
554 | 0963d545 | René Nussbaumer | child.stderr.fileno(): (err, child.stderr), |
555 | 0963d545 | René Nussbaumer | } |
556 | 0963d545 | René Nussbaumer | for fd in fdmap: |
557 | 0963d545 | René Nussbaumer | SetNonblockFlag(fd, True)
|
558 | 0963d545 | René Nussbaumer | |
559 | 0963d545 | René Nussbaumer | while fdmap:
|
560 | c74cda62 | René Nussbaumer | if poll_timeout:
|
561 | d05cf6fa | Iustin Pop | pt = poll_timeout() * 1000
|
562 | d05cf6fa | Iustin Pop | if pt < 0: |
563 | c74cda62 | René Nussbaumer | if linger_timeout is None: |
564 | c74cda62 | René Nussbaumer | logging.warning(msg_timeout) |
565 | c74cda62 | René Nussbaumer | if child.poll() is None: |
566 | c74cda62 | René Nussbaumer | timeout_action = _TIMEOUT_TERM |
567 | c74cda62 | René Nussbaumer | IgnoreProcessNotFound(os.kill, child.pid, signal.SIGTERM) |
568 | c74cda62 | René Nussbaumer | linger_timeout = RunningTimeout(_linger_timeout, True).Remaining
|
569 | d05cf6fa | Iustin Pop | pt = linger_timeout() * 1000
|
570 | d05cf6fa | Iustin Pop | if pt < 0: |
571 | c74cda62 | René Nussbaumer | break
|
572 | c74cda62 | René Nussbaumer | else:
|
573 | c74cda62 | René Nussbaumer | pt = None
|
574 | c74cda62 | René Nussbaumer | |
575 | c74cda62 | René Nussbaumer | pollresult = RetryOnSignal(poller.poll, pt) |
576 | 0963d545 | René Nussbaumer | |
577 | 0963d545 | René Nussbaumer | for fd, event in pollresult: |
578 | 0963d545 | René Nussbaumer | if event & select.POLLIN or event & select.POLLPRI: |
579 | 0963d545 | René Nussbaumer | data = fdmap[fd][1].read()
|
580 | 0963d545 | René Nussbaumer | # no data from read signifies EOF (the same as POLLHUP)
|
581 | 0963d545 | René Nussbaumer | if not data: |
582 | 0963d545 | René Nussbaumer | poller.unregister(fd) |
583 | 0963d545 | René Nussbaumer | del fdmap[fd]
|
584 | 0963d545 | René Nussbaumer | continue
|
585 | 0963d545 | René Nussbaumer | fdmap[fd][0].write(data)
|
586 | 0963d545 | René Nussbaumer | if (event & select.POLLNVAL or event & select.POLLHUP or |
587 | 0963d545 | René Nussbaumer | event & select.POLLERR): |
588 | 9c233417 | Iustin Pop | poller.unregister(fd) |
589 | 9c233417 | Iustin Pop | del fdmap[fd]
|
590 | 9c233417 | Iustin Pop | |
591 | c74cda62 | René Nussbaumer | if timeout is not None: |
592 | c74cda62 | René Nussbaumer | assert callable(poll_timeout) |
593 | c74cda62 | René Nussbaumer | |
594 | c74cda62 | René Nussbaumer | # We have no I/O left but it might still run
|
595 | c74cda62 | René Nussbaumer | if child.poll() is None: |
596 | c74cda62 | René Nussbaumer | _WaitForProcess(child, poll_timeout()) |
597 | c74cda62 | René Nussbaumer | |
598 | c74cda62 | René Nussbaumer | # Terminate if still alive after timeout
|
599 | c74cda62 | René Nussbaumer | if child.poll() is None: |
600 | c74cda62 | René Nussbaumer | if linger_timeout is None: |
601 | c74cda62 | René Nussbaumer | logging.warning(msg_timeout) |
602 | c74cda62 | René Nussbaumer | timeout_action = _TIMEOUT_TERM |
603 | c74cda62 | René Nussbaumer | IgnoreProcessNotFound(os.kill, child.pid, signal.SIGTERM) |
604 | c74cda62 | René Nussbaumer | lt = _linger_timeout |
605 | c74cda62 | René Nussbaumer | else:
|
606 | c74cda62 | René Nussbaumer | lt = linger_timeout() |
607 | c74cda62 | René Nussbaumer | _WaitForProcess(child, lt) |
608 | c74cda62 | René Nussbaumer | |
609 | c74cda62 | René Nussbaumer | # Okay, still alive after timeout and linger timeout? Kill it!
|
610 | c74cda62 | René Nussbaumer | if child.poll() is None: |
611 | c74cda62 | René Nussbaumer | timeout_action = _TIMEOUT_KILL |
612 | c74cda62 | René Nussbaumer | logging.warning(msg_linger) |
613 | c74cda62 | René Nussbaumer | IgnoreProcessNotFound(os.kill, child.pid, signal.SIGKILL) |
614 | c74cda62 | René Nussbaumer | |
615 | 9c233417 | Iustin Pop | out = out.getvalue() |
616 | 9c233417 | Iustin Pop | err = err.getvalue() |
617 | a8083063 | Iustin Pop | |
618 | a8083063 | Iustin Pop | status = child.wait() |
619 | c74cda62 | René Nussbaumer | return out, err, status, timeout_action
|
620 | a8083063 | Iustin Pop | |
621 | 36117c2b | Iustin Pop | |
622 | 8797df43 | Iustin Pop | def _RunCmdFile(cmd, env, via_shell, output, cwd): |
623 | 36117c2b | Iustin Pop | """Run a command and save its output to a file.
|
624 | 36117c2b | Iustin Pop |
|
625 | 36117c2b | Iustin Pop | @type cmd: string or list
|
626 | 36117c2b | Iustin Pop | @param cmd: Command to run
|
627 | 36117c2b | Iustin Pop | @type env: dict
|
628 | 36117c2b | Iustin Pop | @param env: The environment to use
|
629 | 36117c2b | Iustin Pop | @type via_shell: bool
|
630 | 36117c2b | Iustin Pop | @param via_shell: if we should run via the shell
|
631 | 36117c2b | Iustin Pop | @type output: str
|
632 | 36117c2b | Iustin Pop | @param output: the filename in which to save the output
|
633 | 8797df43 | Iustin Pop | @type cwd: string
|
634 | 8797df43 | Iustin Pop | @param cwd: the working directory for the program
|
635 | 36117c2b | Iustin Pop | @rtype: int
|
636 | 36117c2b | Iustin Pop | @return: the exit status
|
637 | 36117c2b | Iustin Pop |
|
638 | 36117c2b | Iustin Pop | """
|
639 | 36117c2b | Iustin Pop | fh = open(output, "a") |
640 | 36117c2b | Iustin Pop | try:
|
641 | 36117c2b | Iustin Pop | child = subprocess.Popen(cmd, shell=via_shell, |
642 | 36117c2b | Iustin Pop | stderr=subprocess.STDOUT, |
643 | 36117c2b | Iustin Pop | stdout=fh, |
644 | 36117c2b | Iustin Pop | stdin=subprocess.PIPE, |
645 | 8797df43 | Iustin Pop | close_fds=True, env=env,
|
646 | 8797df43 | Iustin Pop | cwd=cwd) |
647 | 36117c2b | Iustin Pop | |
648 | 36117c2b | Iustin Pop | child.stdin.close() |
649 | 36117c2b | Iustin Pop | status = child.wait() |
650 | 36117c2b | Iustin Pop | finally:
|
651 | 36117c2b | Iustin Pop | fh.close() |
652 | 36117c2b | Iustin Pop | return status
|
653 | a8083063 | Iustin Pop | |
654 | a8083063 | Iustin Pop | |
655 | 6bb65e3a | Guido Trotter | def RunParts(dir_name, env=None, reset_env=False): |
656 | 6bb65e3a | Guido Trotter | """Run Scripts or programs in a directory
|
657 | 6bb65e3a | Guido Trotter |
|
658 | 6bb65e3a | Guido Trotter | @type dir_name: string
|
659 | 6bb65e3a | Guido Trotter | @param dir_name: absolute path to a directory
|
660 | 6bb65e3a | Guido Trotter | @type env: dict
|
661 | 6bb65e3a | Guido Trotter | @param env: The environment to use
|
662 | 6bb65e3a | Guido Trotter | @type reset_env: boolean
|
663 | 6bb65e3a | Guido Trotter | @param reset_env: whether to reset or keep the default os environment
|
664 | 6bb65e3a | Guido Trotter | @rtype: list of tuples
|
665 | 6bb65e3a | Guido Trotter | @return: list of (name, (one of RUNDIR_STATUS), RunResult)
|
666 | 6bb65e3a | Guido Trotter |
|
667 | 6bb65e3a | Guido Trotter | """
|
668 | 6bb65e3a | Guido Trotter | rr = [] |
669 | 6bb65e3a | Guido Trotter | |
670 | 6bb65e3a | Guido Trotter | try:
|
671 | 6bb65e3a | Guido Trotter | dir_contents = ListVisibleFiles(dir_name) |
672 | 6bb65e3a | Guido Trotter | except OSError, err: |
673 | 6bb65e3a | Guido Trotter | logging.warning("RunParts: skipping %s (cannot list: %s)", dir_name, err)
|
674 | 6bb65e3a | Guido Trotter | return rr
|
675 | 6bb65e3a | Guido Trotter | |
676 | 6bb65e3a | Guido Trotter | for relname in sorted(dir_contents): |
677 | c4feafe8 | Iustin Pop | fname = PathJoin(dir_name, relname) |
678 | 6bb65e3a | Guido Trotter | if not (os.path.isfile(fname) and os.access(fname, os.X_OK) and |
679 | 6bb65e3a | Guido Trotter | constants.EXT_PLUGIN_MASK.match(relname) is not None): |
680 | 6bb65e3a | Guido Trotter | rr.append((relname, constants.RUNPARTS_SKIP, None))
|
681 | 6bb65e3a | Guido Trotter | else:
|
682 | 6bb65e3a | Guido Trotter | try:
|
683 | 6bb65e3a | Guido Trotter | result = RunCmd([fname], env=env, reset_env=reset_env) |
684 | 6bb65e3a | Guido Trotter | except Exception, err: # pylint: disable-msg=W0703 |
685 | 6bb65e3a | Guido Trotter | rr.append((relname, constants.RUNPARTS_ERR, str(err)))
|
686 | 6bb65e3a | Guido Trotter | else:
|
687 | 6bb65e3a | Guido Trotter | rr.append((relname, constants.RUNPARTS_RUN, result)) |
688 | 6bb65e3a | Guido Trotter | |
689 | 6bb65e3a | Guido Trotter | return rr
|
690 | 6bb65e3a | Guido Trotter | |
691 | 6bb65e3a | Guido Trotter | |
692 | 055f822b | Michael Hanselmann | def ResetTempfileModule(): |
693 | 055f822b | Michael Hanselmann | """Resets the random name generator of the tempfile module.
|
694 | 055f822b | Michael Hanselmann |
|
695 | 055f822b | Michael Hanselmann | This function should be called after C{os.fork} in the child process to
|
696 | 055f822b | Michael Hanselmann | ensure it creates a newly seeded random generator. Otherwise it would
|
697 | 055f822b | Michael Hanselmann | generate the same random parts as the parent process. If several processes
|
698 | 055f822b | Michael Hanselmann | race for the creation of a temporary file, this could lead to one not getting
|
699 | 055f822b | Michael Hanselmann | a temporary name.
|
700 | 055f822b | Michael Hanselmann |
|
701 | 055f822b | Michael Hanselmann | """
|
702 | 055f822b | Michael Hanselmann | # pylint: disable-msg=W0212
|
703 | 055f822b | Michael Hanselmann | if hasattr(tempfile, "_once_lock") and hasattr(tempfile, "_name_sequence"): |
704 | 055f822b | Michael Hanselmann | tempfile._once_lock.acquire() |
705 | 055f822b | Michael Hanselmann | try:
|
706 | 055f822b | Michael Hanselmann | # Reset random name generator
|
707 | 055f822b | Michael Hanselmann | tempfile._name_sequence = None
|
708 | 055f822b | Michael Hanselmann | finally:
|
709 | 055f822b | Michael Hanselmann | tempfile._once_lock.release() |
710 | 055f822b | Michael Hanselmann | else:
|
711 | 055f822b | Michael Hanselmann | logging.critical("The tempfile module misses at least one of the"
|
712 | 055f822b | Michael Hanselmann | " '_once_lock' and '_name_sequence' attributes")
|
713 | 055f822b | Michael Hanselmann | |
714 | 055f822b | Michael Hanselmann | |
715 | a5728081 | Guido Trotter | def ForceDictType(target, key_types, allowed_values=None): |
716 | a5728081 | Guido Trotter | """Force the values of a dict to have certain types.
|
717 | a5728081 | Guido Trotter |
|
718 | a5728081 | Guido Trotter | @type target: dict
|
719 | a5728081 | Guido Trotter | @param target: the dict to update
|
720 | a5728081 | Guido Trotter | @type key_types: dict
|
721 | a5728081 | Guido Trotter | @param key_types: dict mapping target dict keys to types
|
722 | a5728081 | Guido Trotter | in constants.ENFORCEABLE_TYPES
|
723 | a5728081 | Guido Trotter | @type allowed_values: list
|
724 | a5728081 | Guido Trotter | @keyword allowed_values: list of specially allowed values
|
725 | a5728081 | Guido Trotter |
|
726 | a5728081 | Guido Trotter | """
|
727 | a5728081 | Guido Trotter | if allowed_values is None: |
728 | a5728081 | Guido Trotter | allowed_values = [] |
729 | a5728081 | Guido Trotter | |
730 | 8b46606c | Guido Trotter | if not isinstance(target, dict): |
731 | 8b46606c | Guido Trotter | msg = "Expected dictionary, got '%s'" % target
|
732 | 8b46606c | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
733 | 8b46606c | Guido Trotter | |
734 | a5728081 | Guido Trotter | for key in target: |
735 | a5728081 | Guido Trotter | if key not in key_types: |
736 | a5728081 | Guido Trotter | msg = "Unknown key '%s'" % key
|
737 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
738 | a5728081 | Guido Trotter | |
739 | a5728081 | Guido Trotter | if target[key] in allowed_values: |
740 | a5728081 | Guido Trotter | continue
|
741 | a5728081 | Guido Trotter | |
742 | 29921401 | Iustin Pop | ktype = key_types[key] |
743 | 29921401 | Iustin Pop | if ktype not in constants.ENFORCEABLE_TYPES: |
744 | 29921401 | Iustin Pop | msg = "'%s' has non-enforceable type %s" % (key, ktype)
|
745 | a5728081 | Guido Trotter | raise errors.ProgrammerError(msg)
|
746 | a5728081 | Guido Trotter | |
747 | 59525e1f | Michael Hanselmann | if ktype in (constants.VTYPE_STRING, constants.VTYPE_MAYBE_STRING): |
748 | 59525e1f | Michael Hanselmann | if target[key] is None and ktype == constants.VTYPE_MAYBE_STRING: |
749 | 59525e1f | Michael Hanselmann | pass
|
750 | 59525e1f | Michael Hanselmann | elif not isinstance(target[key], basestring): |
751 | a5728081 | Guido Trotter | if isinstance(target[key], bool) and not target[key]: |
752 | a5728081 | Guido Trotter | target[key] = ''
|
753 | a5728081 | Guido Trotter | else:
|
754 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid string" % (key, target[key])
|
755 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
756 | 29921401 | Iustin Pop | elif ktype == constants.VTYPE_BOOL:
|
757 | a5728081 | Guido Trotter | if isinstance(target[key], basestring) and target[key]: |
758 | a5728081 | Guido Trotter | if target[key].lower() == constants.VALUE_FALSE:
|
759 | a5728081 | Guido Trotter | target[key] = False
|
760 | a5728081 | Guido Trotter | elif target[key].lower() == constants.VALUE_TRUE:
|
761 | a5728081 | Guido Trotter | target[key] = True
|
762 | a5728081 | Guido Trotter | else:
|
763 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid boolean" % (key, target[key])
|
764 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
765 | a5728081 | Guido Trotter | elif target[key]:
|
766 | a5728081 | Guido Trotter | target[key] = True
|
767 | a5728081 | Guido Trotter | else:
|
768 | a5728081 | Guido Trotter | target[key] = False
|
769 | 29921401 | Iustin Pop | elif ktype == constants.VTYPE_SIZE:
|
770 | a5728081 | Guido Trotter | try:
|
771 | a5728081 | Guido Trotter | target[key] = ParseUnit(target[key]) |
772 | a5728081 | Guido Trotter | except errors.UnitParseError, err:
|
773 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid size. error: %s" % \
|
774 | a5728081 | Guido Trotter | (key, target[key], err) |
775 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
776 | 29921401 | Iustin Pop | elif ktype == constants.VTYPE_INT:
|
777 | a5728081 | Guido Trotter | try:
|
778 | a5728081 | Guido Trotter | target[key] = int(target[key])
|
779 | a5728081 | Guido Trotter | except (ValueError, TypeError): |
780 | a5728081 | Guido Trotter | msg = "'%s' (value %s) is not a valid integer" % (key, target[key])
|
781 | a5728081 | Guido Trotter | raise errors.TypeEnforcementError(msg)
|
782 | a5728081 | Guido Trotter | |
783 | a5728081 | Guido Trotter | |
784 | a01b500b | Michael Hanselmann | def _GetProcStatusPath(pid): |
785 | a01b500b | Michael Hanselmann | """Returns the path for a PID's proc status file.
|
786 | a01b500b | Michael Hanselmann |
|
787 | a01b500b | Michael Hanselmann | @type pid: int
|
788 | a01b500b | Michael Hanselmann | @param pid: Process ID
|
789 | a01b500b | Michael Hanselmann | @rtype: string
|
790 | a01b500b | Michael Hanselmann |
|
791 | a01b500b | Michael Hanselmann | """
|
792 | a01b500b | Michael Hanselmann | return "/proc/%d/status" % pid |
793 | a01b500b | Michael Hanselmann | |
794 | a01b500b | Michael Hanselmann | |
795 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
796 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
|
797 | a8083063 | Iustin Pop |
|
798 | 44bf25ff | Iustin Pop | @note: zombie status is not handled, so zombie processes
|
799 | 44bf25ff | Iustin Pop | will be returned as alive
|
800 | 58885d79 | Iustin Pop | @type pid: int
|
801 | 58885d79 | Iustin Pop | @param pid: the process ID to check
|
802 | 58885d79 | Iustin Pop | @rtype: boolean
|
803 | 58885d79 | Iustin Pop | @return: True if the process exists
|
804 | a8083063 | Iustin Pop |
|
805 | a8083063 | Iustin Pop | """
|
806 | 5ef5ea45 | Guido Trotter | def _TryStat(name): |
807 | 5ef5ea45 | Guido Trotter | try:
|
808 | 5ef5ea45 | Guido Trotter | os.stat(name) |
809 | 5ef5ea45 | Guido Trotter | return True |
810 | 5ef5ea45 | Guido Trotter | except EnvironmentError, err: |
811 | 5ef5ea45 | Guido Trotter | if err.errno in (errno.ENOENT, errno.ENOTDIR): |
812 | 5ef5ea45 | Guido Trotter | return False |
813 | 5ef5ea45 | Guido Trotter | elif err.errno == errno.EINVAL:
|
814 | 5ef5ea45 | Guido Trotter | raise RetryAgain(err)
|
815 | 5ef5ea45 | Guido Trotter | raise
|
816 | 5ef5ea45 | Guido Trotter | |
817 | 5ef5ea45 | Guido Trotter | assert isinstance(pid, int), "pid must be an integer" |
818 | d9f311d7 | Iustin Pop | if pid <= 0: |
819 | d9f311d7 | Iustin Pop | return False |
820 | d9f311d7 | Iustin Pop | |
821 | 5ef5ea45 | Guido Trotter | # /proc in a multiprocessor environment can have strange behaviors.
|
822 | 5ef5ea45 | Guido Trotter | # Retry the os.stat a few times until we get a good result.
|
823 | a8083063 | Iustin Pop | try:
|
824 | a01b500b | Michael Hanselmann | return Retry(_TryStat, (0.01, 1.5, 0.1), 0.5, |
825 | a01b500b | Michael Hanselmann | args=[_GetProcStatusPath(pid)]) |
826 | 5ef5ea45 | Guido Trotter | except RetryTimeout, err:
|
827 | 5ef5ea45 | Guido Trotter | err.RaiseInner() |
828 | a8083063 | Iustin Pop | |
829 | a8083063 | Iustin Pop | |
830 | a01b500b | Michael Hanselmann | def _ParseSigsetT(sigset): |
831 | a01b500b | Michael Hanselmann | """Parse a rendered sigset_t value.
|
832 | a01b500b | Michael Hanselmann |
|
833 | a01b500b | Michael Hanselmann | This is the opposite of the Linux kernel's fs/proc/array.c:render_sigset_t
|
834 | a01b500b | Michael Hanselmann | function.
|
835 | a01b500b | Michael Hanselmann |
|
836 | a01b500b | Michael Hanselmann | @type sigset: string
|
837 | a01b500b | Michael Hanselmann | @param sigset: Rendered signal set from /proc/$pid/status
|
838 | a01b500b | Michael Hanselmann | @rtype: set
|
839 | a01b500b | Michael Hanselmann | @return: Set of all enabled signal numbers
|
840 | a01b500b | Michael Hanselmann |
|
841 | a01b500b | Michael Hanselmann | """
|
842 | a01b500b | Michael Hanselmann | result = set()
|
843 | a01b500b | Michael Hanselmann | |
844 | a01b500b | Michael Hanselmann | signum = 0
|
845 | a01b500b | Michael Hanselmann | for ch in reversed(sigset): |
846 | a01b500b | Michael Hanselmann | chv = int(ch, 16) |
847 | a01b500b | Michael Hanselmann | |
848 | a01b500b | Michael Hanselmann | # The following could be done in a loop, but it's easier to read and
|
849 | a01b500b | Michael Hanselmann | # understand in the unrolled form
|
850 | a01b500b | Michael Hanselmann | if chv & 1: |
851 | a01b500b | Michael Hanselmann | result.add(signum + 1)
|
852 | a01b500b | Michael Hanselmann | if chv & 2: |
853 | a01b500b | Michael Hanselmann | result.add(signum + 2)
|
854 | a01b500b | Michael Hanselmann | if chv & 4: |
855 | a01b500b | Michael Hanselmann | result.add(signum + 3)
|
856 | a01b500b | Michael Hanselmann | if chv & 8: |
857 | a01b500b | Michael Hanselmann | result.add(signum + 4)
|
858 | a01b500b | Michael Hanselmann | |
859 | a01b500b | Michael Hanselmann | signum += 4
|
860 | a01b500b | Michael Hanselmann | |
861 | a01b500b | Michael Hanselmann | return result
|
862 | a01b500b | Michael Hanselmann | |
863 | a01b500b | Michael Hanselmann | |
864 | a01b500b | Michael Hanselmann | def _GetProcStatusField(pstatus, field): |
865 | a01b500b | Michael Hanselmann | """Retrieves a field from the contents of a proc status file.
|
866 | a01b500b | Michael Hanselmann |
|
867 | a01b500b | Michael Hanselmann | @type pstatus: string
|
868 | a01b500b | Michael Hanselmann | @param pstatus: Contents of /proc/$pid/status
|
869 | a01b500b | Michael Hanselmann | @type field: string
|
870 | a01b500b | Michael Hanselmann | @param field: Name of field whose value should be returned
|
871 | a01b500b | Michael Hanselmann | @rtype: string
|
872 | a01b500b | Michael Hanselmann |
|
873 | a01b500b | Michael Hanselmann | """
|
874 | a01b500b | Michael Hanselmann | for line in pstatus.splitlines(): |
875 | a01b500b | Michael Hanselmann | parts = line.split(":", 1) |
876 | a01b500b | Michael Hanselmann | |
877 | a01b500b | Michael Hanselmann | if len(parts) < 2 or parts[0] != field: |
878 | a01b500b | Michael Hanselmann | continue
|
879 | a01b500b | Michael Hanselmann | |
880 | a01b500b | Michael Hanselmann | return parts[1].strip() |
881 | a01b500b | Michael Hanselmann | |
882 | a01b500b | Michael Hanselmann | return None |
883 | a01b500b | Michael Hanselmann | |
884 | a01b500b | Michael Hanselmann | |
885 | a01b500b | Michael Hanselmann | def IsProcessHandlingSignal(pid, signum, status_path=None): |
886 | a01b500b | Michael Hanselmann | """Checks whether a process is handling a signal.
|
887 | a01b500b | Michael Hanselmann |
|
888 | a01b500b | Michael Hanselmann | @type pid: int
|
889 | a01b500b | Michael Hanselmann | @param pid: Process ID
|
890 | a01b500b | Michael Hanselmann | @type signum: int
|
891 | a01b500b | Michael Hanselmann | @param signum: Signal number
|
892 | a01b500b | Michael Hanselmann | @rtype: bool
|
893 | a01b500b | Michael Hanselmann |
|
894 | a01b500b | Michael Hanselmann | """
|
895 | a01b500b | Michael Hanselmann | if status_path is None: |
896 | a01b500b | Michael Hanselmann | status_path = _GetProcStatusPath(pid) |
897 | a01b500b | Michael Hanselmann | |
898 | a01b500b | Michael Hanselmann | try:
|
899 | a01b500b | Michael Hanselmann | proc_status = ReadFile(status_path) |
900 | a01b500b | Michael Hanselmann | except EnvironmentError, err: |
901 | a01b500b | Michael Hanselmann | # In at least one case, reading /proc/$pid/status failed with ESRCH.
|
902 | a01b500b | Michael Hanselmann | if err.errno in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL, errno.ESRCH): |
903 | a01b500b | Michael Hanselmann | return False |
904 | a01b500b | Michael Hanselmann | raise
|
905 | a01b500b | Michael Hanselmann | |
906 | a01b500b | Michael Hanselmann | sigcgt = _GetProcStatusField(proc_status, "SigCgt")
|
907 | a01b500b | Michael Hanselmann | if sigcgt is None: |
908 | a01b500b | Michael Hanselmann | raise RuntimeError("%s is missing 'SigCgt' field" % status_path) |
909 | a01b500b | Michael Hanselmann | |
910 | a01b500b | Michael Hanselmann | # Now check whether signal is handled
|
911 | a01b500b | Michael Hanselmann | return signum in _ParseSigsetT(sigcgt) |
912 | a01b500b | Michael Hanselmann | |
913 | a01b500b | Michael Hanselmann | |
914 | 28f34048 | Michael Hanselmann | def ValidateServiceName(name): |
915 | 28f34048 | Michael Hanselmann | """Validate the given service name.
|
916 | 28f34048 | Michael Hanselmann |
|
917 | 28f34048 | Michael Hanselmann | @type name: number or string
|
918 | 28f34048 | Michael Hanselmann | @param name: Service name or port specification
|
919 | 28f34048 | Michael Hanselmann |
|
920 | 28f34048 | Michael Hanselmann | """
|
921 | 28f34048 | Michael Hanselmann | try:
|
922 | 28f34048 | Michael Hanselmann | numport = int(name)
|
923 | 28f34048 | Michael Hanselmann | except (ValueError, TypeError): |
924 | 28f34048 | Michael Hanselmann | # Non-numeric service name
|
925 | 28f34048 | Michael Hanselmann | valid = _VALID_SERVICE_NAME_RE.match(name) |
926 | 28f34048 | Michael Hanselmann | else:
|
927 | 28f34048 | Michael Hanselmann | # Numeric port (protocols other than TCP or UDP might need adjustments
|
928 | 28f34048 | Michael Hanselmann | # here)
|
929 | 28f34048 | Michael Hanselmann | valid = (numport >= 0 and numport < (1 << 16)) |
930 | 28f34048 | Michael Hanselmann | |
931 | 28f34048 | Michael Hanselmann | if not valid: |
932 | 28f34048 | Michael Hanselmann | raise errors.OpPrereqError("Invalid service name '%s'" % name, |
933 | 28f34048 | Michael Hanselmann | errors.ECODE_INVAL) |
934 | 28f34048 | Michael Hanselmann | |
935 | 28f34048 | Michael Hanselmann | return name
|
936 | 28f34048 | Michael Hanselmann | |
937 | 28f34048 | Michael Hanselmann | |
938 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
939 | a8083063 | Iustin Pop | """List volume groups and their size
|
940 | a8083063 | Iustin Pop |
|
941 | 58885d79 | Iustin Pop | @rtype: dict
|
942 | 58885d79 | Iustin Pop | @return:
|
943 | 58885d79 | Iustin Pop | Dictionary with keys volume name and values
|
944 | 58885d79 | Iustin Pop | the size of the volume
|
945 | a8083063 | Iustin Pop |
|
946 | a8083063 | Iustin Pop | """
|
947 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
948 | a8083063 | Iustin Pop | result = RunCmd(command) |
949 | a8083063 | Iustin Pop | retval = {} |
950 | a8083063 | Iustin Pop | if result.failed:
|
951 | a8083063 | Iustin Pop | return retval
|
952 | a8083063 | Iustin Pop | |
953 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
954 | a8083063 | Iustin Pop | try:
|
955 | a8083063 | Iustin Pop | name, size = line.split() |
956 | a8083063 | Iustin Pop | size = int(float(size)) |
957 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
958 | bb698c1f | Iustin Pop | logging.error("Invalid output from vgs (%s): %s", err, line)
|
959 | a8083063 | Iustin Pop | continue
|
960 | a8083063 | Iustin Pop | |
961 | a8083063 | Iustin Pop | retval[name] = size |
962 | a8083063 | Iustin Pop | |
963 | a8083063 | Iustin Pop | return retval
|
964 | a8083063 | Iustin Pop | |
965 | a8083063 | Iustin Pop | |
966 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
967 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
968 | a8083063 | Iustin Pop |
|
969 | 58885d79 | Iustin Pop | @type bridge: str
|
970 | 58885d79 | Iustin Pop | @param bridge: the bridge name to check
|
971 | 58885d79 | Iustin Pop | @rtype: boolean
|
972 | 58885d79 | Iustin Pop | @return: True if it does
|
973 | a8083063 | Iustin Pop |
|
974 | a8083063 | Iustin Pop | """
|
975 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
976 | a8083063 | Iustin Pop | |
977 | a8083063 | Iustin Pop | |
978 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
979 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
980 | a8083063 | Iustin Pop |
|
981 | 58885d79 | Iustin Pop | This function tries to apply function I{fn} to I{val}. If no
|
982 | 58885d79 | Iustin Pop | C{ValueError} or C{TypeError} exceptions are raised, it will return
|
983 | 58885d79 | Iustin Pop | the result, else it will return the original value. Any other
|
984 | 58885d79 | Iustin Pop | exceptions are propagated to the caller.
|
985 | 58885d79 | Iustin Pop |
|
986 | 58885d79 | Iustin Pop | @type fn: callable
|
987 | 58885d79 | Iustin Pop | @param fn: function to apply to the value
|
988 | 58885d79 | Iustin Pop | @param val: the value to be converted
|
989 | 58885d79 | Iustin Pop | @return: The converted value if the conversion was successful,
|
990 | 58885d79 | Iustin Pop | otherwise the original value.
|
991 | a8083063 | Iustin Pop |
|
992 | a8083063 | Iustin Pop | """
|
993 | a8083063 | Iustin Pop | try:
|
994 | a8083063 | Iustin Pop | nv = fn(val) |
995 | 7c4d6c7b | Michael Hanselmann | except (ValueError, TypeError): |
996 | a8083063 | Iustin Pop | nv = val |
997 | a8083063 | Iustin Pop | return nv
|
998 | a8083063 | Iustin Pop | |
999 | a8083063 | Iustin Pop | |
1000 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
1001 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
1002 | a8083063 | Iustin Pop |
|
1003 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
1004 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
1005 | a8083063 | Iustin Pop | the actual command.
|
1006 | a8083063 | Iustin Pop |
|
1007 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
1008 | a8083063 | Iustin Pop | side.
|
1009 | a8083063 | Iustin Pop |
|
1010 | 58885d79 | Iustin Pop | @type word: str
|
1011 | 58885d79 | Iustin Pop | @param word: the word to check
|
1012 | 58885d79 | Iustin Pop | @rtype: boolean
|
1013 | 58885d79 | Iustin Pop | @return: True if the word is 'safe'
|
1014 | 58885d79 | Iustin Pop |
|
1015 | a8083063 | Iustin Pop | """
|
1016 | 0b5303da | Iustin Pop | return bool(_SHELLPARAM_REGEX.match(word)) |
1017 | a8083063 | Iustin Pop | |
1018 | a8083063 | Iustin Pop | |
1019 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
1020 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
1021 | a8083063 | Iustin Pop |
|
1022 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
1023 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
1024 | 5bbd3f7f | Michael Hanselmann | metacharacters). If everything is ok, it will return the result of
|
1025 | a8083063 | Iustin Pop | template % args.
|
1026 | a8083063 | Iustin Pop |
|
1027 | 58885d79 | Iustin Pop | @type template: str
|
1028 | 58885d79 | Iustin Pop | @param template: the string holding the template for the
|
1029 | 58885d79 | Iustin Pop | string formatting
|
1030 | 58885d79 | Iustin Pop | @rtype: str
|
1031 | 58885d79 | Iustin Pop | @return: the expanded command line
|
1032 | 58885d79 | Iustin Pop |
|
1033 | a8083063 | Iustin Pop | """
|
1034 | a8083063 | Iustin Pop | for word in args: |
1035 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
1036 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
1037 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
1038 | a8083063 | Iustin Pop | return template % args
|
1039 | a8083063 | Iustin Pop | |
1040 | a8083063 | Iustin Pop | |
1041 | 31155d60 | Balazs Lecz | def ParseCpuMask(cpu_mask): |
1042 | 31155d60 | Balazs Lecz | """Parse a CPU mask definition and return the list of CPU IDs.
|
1043 | 31155d60 | Balazs Lecz |
|
1044 | 31155d60 | Balazs Lecz | CPU mask format: comma-separated list of CPU IDs
|
1045 | 31155d60 | Balazs Lecz | or dash-separated ID ranges
|
1046 | 31155d60 | Balazs Lecz | Example: "0-2,5" -> "0,1,2,5"
|
1047 | 31155d60 | Balazs Lecz |
|
1048 | 31155d60 | Balazs Lecz | @type cpu_mask: str
|
1049 | 31155d60 | Balazs Lecz | @param cpu_mask: CPU mask definition
|
1050 | 31155d60 | Balazs Lecz | @rtype: list of int
|
1051 | 31155d60 | Balazs Lecz | @return: list of CPU IDs
|
1052 | 31155d60 | Balazs Lecz |
|
1053 | 31155d60 | Balazs Lecz | """
|
1054 | 31155d60 | Balazs Lecz | if not cpu_mask: |
1055 | 31155d60 | Balazs Lecz | return []
|
1056 | 31155d60 | Balazs Lecz | cpu_list = [] |
1057 | 31155d60 | Balazs Lecz | for range_def in cpu_mask.split(","): |
1058 | 31155d60 | Balazs Lecz | boundaries = range_def.split("-")
|
1059 | 31155d60 | Balazs Lecz | n_elements = len(boundaries)
|
1060 | 31155d60 | Balazs Lecz | if n_elements > 2: |
1061 | 31155d60 | Balazs Lecz | raise errors.ParseError("Invalid CPU ID range definition" |
1062 | 31155d60 | Balazs Lecz | " (only one hyphen allowed): %s" % range_def)
|
1063 | 31155d60 | Balazs Lecz | try:
|
1064 | 31155d60 | Balazs Lecz | lower = int(boundaries[0]) |
1065 | 31155d60 | Balazs Lecz | except (ValueError, TypeError), err: |
1066 | 31155d60 | Balazs Lecz | raise errors.ParseError("Invalid CPU ID value for lower boundary of" |
1067 | 31155d60 | Balazs Lecz | " CPU ID range: %s" % str(err)) |
1068 | 31155d60 | Balazs Lecz | try:
|
1069 | 31155d60 | Balazs Lecz | higher = int(boundaries[-1]) |
1070 | 31155d60 | Balazs Lecz | except (ValueError, TypeError), err: |
1071 | 31155d60 | Balazs Lecz | raise errors.ParseError("Invalid CPU ID value for higher boundary of" |
1072 | 31155d60 | Balazs Lecz | " CPU ID range: %s" % str(err)) |
1073 | 31155d60 | Balazs Lecz | if lower > higher:
|
1074 | 31155d60 | Balazs Lecz | raise errors.ParseError("Invalid CPU ID range definition" |
1075 | 31155d60 | Balazs Lecz | " (%d > %d): %s" % (lower, higher, range_def))
|
1076 | 31155d60 | Balazs Lecz | cpu_list.extend(range(lower, higher + 1)) |
1077 | 31155d60 | Balazs Lecz | return cpu_list
|
1078 | 31155d60 | Balazs Lecz | |
1079 | 31155d60 | Balazs Lecz | |
1080 | 257f4c0a | Iustin Pop | def GetHomeDir(user, default=None): |
1081 | 257f4c0a | Iustin Pop | """Try to get the homedir of the given user.
|
1082 | 257f4c0a | Iustin Pop |
|
1083 | 257f4c0a | Iustin Pop | The user can be passed either as a string (denoting the name) or as
|
1084 | 257f4c0a | Iustin Pop | an integer (denoting the user id). If the user is not found, the
|
1085 | 257f4c0a | Iustin Pop | 'default' argument is returned, which defaults to None.
|
1086 | 2f8b60b3 | Iustin Pop |
|
1087 | 2f8b60b3 | Iustin Pop | """
|
1088 | 2f8b60b3 | Iustin Pop | try:
|
1089 | 257f4c0a | Iustin Pop | if isinstance(user, basestring): |
1090 | 257f4c0a | Iustin Pop | result = pwd.getpwnam(user) |
1091 | 257f4c0a | Iustin Pop | elif isinstance(user, (int, long)): |
1092 | 257f4c0a | Iustin Pop | result = pwd.getpwuid(user) |
1093 | 257f4c0a | Iustin Pop | else:
|
1094 | 257f4c0a | Iustin Pop | raise errors.ProgrammerError("Invalid type passed to GetHomeDir (%s)" % |
1095 | 257f4c0a | Iustin Pop | type(user))
|
1096 | 2f8b60b3 | Iustin Pop | except KeyError: |
1097 | 2f8b60b3 | Iustin Pop | return default
|
1098 | 2f8b60b3 | Iustin Pop | return result.pw_dir
|
1099 | 59072e7e | Michael Hanselmann | |
1100 | 59072e7e | Michael Hanselmann | |
1101 | 24818e8f | Michael Hanselmann | def NewUUID(): |
1102 | 59072e7e | Michael Hanselmann | """Returns a random UUID.
|
1103 | 59072e7e | Michael Hanselmann |
|
1104 | 58885d79 | Iustin Pop | @note: This is a Linux-specific method as it uses the /proc
|
1105 | 58885d79 | Iustin Pop | filesystem.
|
1106 | 58885d79 | Iustin Pop | @rtype: str
|
1107 | 58885d79 | Iustin Pop |
|
1108 | 59072e7e | Michael Hanselmann | """
|
1109 | 13998ef2 | Michael Hanselmann | return ReadFile(_RANDOM_UUID_FILE, size=128).rstrip("\n") |
1110 | 087b34fe | Iustin Pop | |
1111 | 087b34fe | Iustin Pop | |
1112 | 7b4126b7 | Iustin Pop | def FirstFree(seq, base=0): |
1113 | 7b4126b7 | Iustin Pop | """Returns the first non-existing integer from seq.
|
1114 | 7b4126b7 | Iustin Pop |
|
1115 | 7b4126b7 | Iustin Pop | The seq argument should be a sorted list of positive integers. The
|
1116 | 7b4126b7 | Iustin Pop | first time the index of an element is smaller than the element
|
1117 | 7b4126b7 | Iustin Pop | value, the index will be returned.
|
1118 | 7b4126b7 | Iustin Pop |
|
1119 | 7b4126b7 | Iustin Pop | The base argument is used to start at a different offset,
|
1120 | 58885d79 | Iustin Pop | i.e. C{[3, 4, 6]} with I{offset=3} will return 5.
|
1121 | 58885d79 | Iustin Pop |
|
1122 | 58885d79 | Iustin Pop | Example: C{[0, 1, 3]} will return I{2}.
|
1123 | 7b4126b7 | Iustin Pop |
|
1124 | 58885d79 | Iustin Pop | @type seq: sequence
|
1125 | 58885d79 | Iustin Pop | @param seq: the sequence to be analyzed.
|
1126 | 58885d79 | Iustin Pop | @type base: int
|
1127 | 58885d79 | Iustin Pop | @param base: use this value as the base index of the sequence
|
1128 | 58885d79 | Iustin Pop | @rtype: int
|
1129 | 58885d79 | Iustin Pop | @return: the first non-used index in the sequence
|
1130 | 7b4126b7 | Iustin Pop |
|
1131 | 7b4126b7 | Iustin Pop | """
|
1132 | 7b4126b7 | Iustin Pop | for idx, elem in enumerate(seq): |
1133 | 7b4126b7 | Iustin Pop | assert elem >= base, "Passed element is higher than base offset" |
1134 | 7b4126b7 | Iustin Pop | if elem > idx + base:
|
1135 | 7b4126b7 | Iustin Pop | # idx is not used
|
1136 | 7b4126b7 | Iustin Pop | return idx + base
|
1137 | 7b4126b7 | Iustin Pop | return None |
1138 | 7b4126b7 | Iustin Pop | |
1139 | 7b4126b7 | Iustin Pop | |
1140 | dfdc4060 | Guido Trotter | def SingleWaitForFdCondition(fdobj, event, timeout): |
1141 | dcd511c8 | Guido Trotter | """Waits for a condition to occur on the socket.
|
1142 | dcd511c8 | Guido Trotter |
|
1143 | dfdc4060 | Guido Trotter | Immediately returns at the first interruption.
|
1144 | dfdc4060 | Guido Trotter |
|
1145 | dfdc4060 | Guido Trotter | @type fdobj: integer or object supporting a fileno() method
|
1146 | dfdc4060 | Guido Trotter | @param fdobj: entity to wait for events on
|
1147 | dfdc4060 | Guido Trotter | @type event: integer
|
1148 | dcd511c8 | Guido Trotter | @param event: ORed condition (see select module)
|
1149 | dcd511c8 | Guido Trotter | @type timeout: float or None
|
1150 | dcd511c8 | Guido Trotter | @param timeout: Timeout in seconds
|
1151 | dcd511c8 | Guido Trotter | @rtype: int or None
|
1152 | dcd511c8 | Guido Trotter | @return: None for timeout, otherwise occured conditions
|
1153 | dcd511c8 | Guido Trotter |
|
1154 | dcd511c8 | Guido Trotter | """
|
1155 | dcd511c8 | Guido Trotter | check = (event | select.POLLPRI | |
1156 | dcd511c8 | Guido Trotter | select.POLLNVAL | select.POLLHUP | select.POLLERR) |
1157 | dcd511c8 | Guido Trotter | |
1158 | dcd511c8 | Guido Trotter | if timeout is not None: |
1159 | dcd511c8 | Guido Trotter | # Poller object expects milliseconds
|
1160 | dcd511c8 | Guido Trotter | timeout *= 1000
|
1161 | dcd511c8 | Guido Trotter | |
1162 | dcd511c8 | Guido Trotter | poller = select.poll() |
1163 | dfdc4060 | Guido Trotter | poller.register(fdobj, event) |
1164 | dcd511c8 | Guido Trotter | try:
|
1165 | dfdc4060 | Guido Trotter | # TODO: If the main thread receives a signal and we have no timeout, we
|
1166 | dfdc4060 | Guido Trotter | # could wait forever. This should check a global "quit" flag or something
|
1167 | dfdc4060 | Guido Trotter | # every so often.
|
1168 | dfdc4060 | Guido Trotter | io_events = poller.poll(timeout) |
1169 | dfdc4060 | Guido Trotter | except select.error, err:
|
1170 | dfdc4060 | Guido Trotter | if err[0] != errno.EINTR: |
1171 | dfdc4060 | Guido Trotter | raise
|
1172 | dfdc4060 | Guido Trotter | io_events = [] |
1173 | dfdc4060 | Guido Trotter | if io_events and io_events[0][1] & check: |
1174 | dfdc4060 | Guido Trotter | return io_events[0][1] |
1175 | dfdc4060 | Guido Trotter | else:
|
1176 | dfdc4060 | Guido Trotter | return None |
1177 | dfdc4060 | Guido Trotter | |
1178 | dfdc4060 | Guido Trotter | |
1179 | dfdc4060 | Guido Trotter | class FdConditionWaiterHelper(object): |
1180 | dfdc4060 | Guido Trotter | """Retry helper for WaitForFdCondition.
|
1181 | dfdc4060 | Guido Trotter |
|
1182 | dfdc4060 | Guido Trotter | This class contains the retried and wait functions that make sure
|
1183 | dfdc4060 | Guido Trotter | WaitForFdCondition can continue waiting until the timeout is actually
|
1184 | dfdc4060 | Guido Trotter | expired.
|
1185 | dfdc4060 | Guido Trotter |
|
1186 | dfdc4060 | Guido Trotter | """
|
1187 | dfdc4060 | Guido Trotter | |
1188 | dfdc4060 | Guido Trotter | def __init__(self, timeout): |
1189 | dfdc4060 | Guido Trotter | self.timeout = timeout
|
1190 | dfdc4060 | Guido Trotter | |
1191 | dfdc4060 | Guido Trotter | def Poll(self, fdobj, event): |
1192 | dfdc4060 | Guido Trotter | result = SingleWaitForFdCondition(fdobj, event, self.timeout)
|
1193 | dfdc4060 | Guido Trotter | if result is None: |
1194 | dfdc4060 | Guido Trotter | raise RetryAgain()
|
1195 | dfdc4060 | Guido Trotter | else:
|
1196 | dfdc4060 | Guido Trotter | return result
|
1197 | dfdc4060 | Guido Trotter | |
1198 | dfdc4060 | Guido Trotter | def UpdateTimeout(self, timeout): |
1199 | dfdc4060 | Guido Trotter | self.timeout = timeout
|
1200 | dfdc4060 | Guido Trotter | |
1201 | dfdc4060 | Guido Trotter | |
1202 | dfdc4060 | Guido Trotter | def WaitForFdCondition(fdobj, event, timeout): |
1203 | dfdc4060 | Guido Trotter | """Waits for a condition to occur on the socket.
|
1204 | dfdc4060 | Guido Trotter |
|
1205 | dfdc4060 | Guido Trotter | Retries until the timeout is expired, even if interrupted.
|
1206 | dfdc4060 | Guido Trotter |
|
1207 | dfdc4060 | Guido Trotter | @type fdobj: integer or object supporting a fileno() method
|
1208 | dfdc4060 | Guido Trotter | @param fdobj: entity to wait for events on
|
1209 | dfdc4060 | Guido Trotter | @type event: integer
|
1210 | dfdc4060 | Guido Trotter | @param event: ORed condition (see select module)
|
1211 | dfdc4060 | Guido Trotter | @type timeout: float or None
|
1212 | dfdc4060 | Guido Trotter | @param timeout: Timeout in seconds
|
1213 | dfdc4060 | Guido Trotter | @rtype: int or None
|
1214 | dfdc4060 | Guido Trotter | @return: None for timeout, otherwise occured conditions
|
1215 | dfdc4060 | Guido Trotter |
|
1216 | dfdc4060 | Guido Trotter | """
|
1217 | dfdc4060 | Guido Trotter | if timeout is not None: |
1218 | dfdc4060 | Guido Trotter | retrywaiter = FdConditionWaiterHelper(timeout) |
1219 | 1b429e2a | Iustin Pop | try:
|
1220 | 1b429e2a | Iustin Pop | result = Retry(retrywaiter.Poll, RETRY_REMAINING_TIME, timeout, |
1221 | 1b429e2a | Iustin Pop | args=(fdobj, event), wait_fn=retrywaiter.UpdateTimeout) |
1222 | 1b429e2a | Iustin Pop | except RetryTimeout:
|
1223 | 1b429e2a | Iustin Pop | result = None
|
1224 | dfdc4060 | Guido Trotter | else:
|
1225 | dfdc4060 | Guido Trotter | result = None
|
1226 | dfdc4060 | Guido Trotter | while result is None: |
1227 | dfdc4060 | Guido Trotter | result = SingleWaitForFdCondition(fdobj, event, timeout) |
1228 | dfdc4060 | Guido Trotter | return result
|
1229 | 2de64672 | Iustin Pop | |
1230 | 2de64672 | Iustin Pop | |
1231 | 7d88772a | Iustin Pop | def CloseFDs(noclose_fds=None): |
1232 | 7d88772a | Iustin Pop | """Close file descriptors.
|
1233 | 7d88772a | Iustin Pop |
|
1234 | 7d88772a | Iustin Pop | This closes all file descriptors above 2 (i.e. except
|
1235 | 7d88772a | Iustin Pop | stdin/out/err).
|
1236 | 8f765069 | Iustin Pop |
|
1237 | 58885d79 | Iustin Pop | @type noclose_fds: list or None
|
1238 | 58885d79 | Iustin Pop | @param noclose_fds: if given, it denotes a list of file descriptor
|
1239 | 58885d79 | Iustin Pop | that should not be closed
|
1240 | 58885d79 | Iustin Pop |
|
1241 | 8f765069 | Iustin Pop | """
|
1242 | 8f765069 | Iustin Pop | # Default maximum for the number of available file descriptors.
|
1243 | 8f765069 | Iustin Pop | if 'SC_OPEN_MAX' in os.sysconf_names: |
1244 | 8f765069 | Iustin Pop | try:
|
1245 | 8f765069 | Iustin Pop | MAXFD = os.sysconf('SC_OPEN_MAX')
|
1246 | 8f765069 | Iustin Pop | if MAXFD < 0: |
1247 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1248 | 8f765069 | Iustin Pop | except OSError: |
1249 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1250 | 8f765069 | Iustin Pop | else:
|
1251 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1252 | 7d88772a | Iustin Pop | maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
|
1253 | 7d88772a | Iustin Pop | if (maxfd == resource.RLIM_INFINITY):
|
1254 | 7d88772a | Iustin Pop | maxfd = MAXFD |
1255 | 7d88772a | Iustin Pop | |
1256 | 7d88772a | Iustin Pop | # Iterate through and close all file descriptors (except the standard ones)
|
1257 | 7d88772a | Iustin Pop | for fd in range(3, maxfd): |
1258 | 7d88772a | Iustin Pop | if noclose_fds and fd in noclose_fds: |
1259 | 7d88772a | Iustin Pop | continue
|
1260 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(fd) |
1261 | 7d88772a | Iustin Pop | |
1262 | 7d88772a | Iustin Pop | |
1263 | 0070a462 | René Nussbaumer | def Daemonize(logfile): |
1264 | 7d88772a | Iustin Pop | """Daemonize the current process.
|
1265 | 7d88772a | Iustin Pop |
|
1266 | 7d88772a | Iustin Pop | This detaches the current process from the controlling terminal and
|
1267 | 7d88772a | Iustin Pop | runs it in the background as a daemon.
|
1268 | 7d88772a | Iustin Pop |
|
1269 | 7d88772a | Iustin Pop | @type logfile: str
|
1270 | 7d88772a | Iustin Pop | @param logfile: the logfile to which we should redirect stdout/stderr
|
1271 | 7d88772a | Iustin Pop | @rtype: int
|
1272 | 5fcc718f | Iustin Pop | @return: the value zero
|
1273 | 7d88772a | Iustin Pop |
|
1274 | 7d88772a | Iustin Pop | """
|
1275 | 7260cfbe | Iustin Pop | # pylint: disable-msg=W0212
|
1276 | 7260cfbe | Iustin Pop | # yes, we really want os._exit
|
1277 | 8f765069 | Iustin Pop | |
1278 | b78aa8c2 | Iustin Pop | # TODO: do another attempt to merge Daemonize and StartDaemon, or at
|
1279 | b78aa8c2 | Iustin Pop | # least abstract the pipe functionality between them
|
1280 | b78aa8c2 | Iustin Pop | |
1281 | b78aa8c2 | Iustin Pop | # Create pipe for sending error messages
|
1282 | b78aa8c2 | Iustin Pop | (rpipe, wpipe) = os.pipe() |
1283 | b78aa8c2 | Iustin Pop | |
1284 | 8f765069 | Iustin Pop | # this might fail
|
1285 | 8f765069 | Iustin Pop | pid = os.fork() |
1286 | 8f765069 | Iustin Pop | if (pid == 0): # The first child. |
1287 | 0260032c | Iustin Pop | SetupDaemonEnv() |
1288 | 0260032c | Iustin Pop | |
1289 | 8f765069 | Iustin Pop | # this might fail
|
1290 | 8f765069 | Iustin Pop | pid = os.fork() # Fork a second child.
|
1291 | 8f765069 | Iustin Pop | if (pid == 0): # The second child. |
1292 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(rpipe) |
1293 | 8f765069 | Iustin Pop | else:
|
1294 | 8f765069 | Iustin Pop | # exit() or _exit()? See below.
|
1295 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent (the first child) of the second child. |
1296 | 8f765069 | Iustin Pop | else:
|
1297 | 71ab9dbe | Michael Hanselmann | CloseFdNoError(wpipe) |
1298 | b78aa8c2 | Iustin Pop | # Wait for daemon to be started (or an error message to
|
1299 | b78aa8c2 | Iustin Pop | # arrive) and read up to 100 KB as an error message
|
1300 | b78aa8c2 | Iustin Pop | errormsg = RetryOnSignal(os.read, rpipe, 100 * 1024) |
1301 | b78aa8c2 | Iustin Pop | if errormsg:
|
1302 | b78aa8c2 | Iustin Pop | sys.stderr.write("Error when starting daemon process: %r\n" % errormsg)
|
1303 | b78aa8c2 | Iustin Pop | rcode = 1
|
1304 | b78aa8c2 | Iustin Pop | else:
|
1305 | b78aa8c2 | Iustin Pop | rcode = 0
|
1306 | b78aa8c2 | Iustin Pop | os._exit(rcode) # Exit parent of the first child.
|
1307 | 8f765069 | Iustin Pop | |
1308 | 79634555 | Iustin Pop | SetupDaemonFDs(logfile, None)
|
1309 | b78aa8c2 | Iustin Pop | return wpipe
|
1310 | 57c177af | Iustin Pop | |
1311 | 57c177af | Iustin Pop | |
1312 | 2826b361 | Guido Trotter | def EnsureDaemon(name): |
1313 | 2826b361 | Guido Trotter | """Check for and start daemon if not alive.
|
1314 | 2826b361 | Guido Trotter |
|
1315 | 2826b361 | Guido Trotter | """
|
1316 | 2826b361 | Guido Trotter | result = RunCmd([constants.DAEMON_UTIL, "check-and-start", name])
|
1317 | 2826b361 | Guido Trotter | if result.failed:
|
1318 | 2826b361 | Guido Trotter | logging.error("Can't start daemon '%s', failure %s, output: %s",
|
1319 | 2826b361 | Guido Trotter | name, result.fail_reason, result.output) |
1320 | 2826b361 | Guido Trotter | return False |
1321 | 2826b361 | Guido Trotter | |
1322 | 2826b361 | Guido Trotter | return True |
1323 | b330ac0b | Guido Trotter | |
1324 | b330ac0b | Guido Trotter | |
1325 | db147305 | Tom Limoncelli | def StopDaemon(name): |
1326 | db147305 | Tom Limoncelli | """Stop daemon
|
1327 | db147305 | Tom Limoncelli |
|
1328 | db147305 | Tom Limoncelli | """
|
1329 | db147305 | Tom Limoncelli | result = RunCmd([constants.DAEMON_UTIL, "stop", name])
|
1330 | db147305 | Tom Limoncelli | if result.failed:
|
1331 | db147305 | Tom Limoncelli | logging.error("Can't stop daemon '%s', failure %s, output: %s",
|
1332 | db147305 | Tom Limoncelli | name, result.fail_reason, result.output) |
1333 | db147305 | Tom Limoncelli | return False |
1334 | db147305 | Tom Limoncelli | |
1335 | db147305 | Tom Limoncelli | return True |
1336 | db147305 | Tom Limoncelli | |
1337 | db147305 | Tom Limoncelli | |
1338 | ff5251bc | Iustin Pop | def KillProcess(pid, signal_=signal.SIGTERM, timeout=30, |
1339 | ff5251bc | Iustin Pop | waitpid=False):
|
1340 | b2a1f511 | Iustin Pop | """Kill a process given by its pid.
|
1341 | b2a1f511 | Iustin Pop |
|
1342 | b2a1f511 | Iustin Pop | @type pid: int
|
1343 | b2a1f511 | Iustin Pop | @param pid: The PID to terminate.
|
1344 | 38206f3c | Iustin Pop | @type signal_: int
|
1345 | 38206f3c | Iustin Pop | @param signal_: The signal to send, by default SIGTERM
|
1346 | b2a1f511 | Iustin Pop | @type timeout: int
|
1347 | b2a1f511 | Iustin Pop | @param timeout: The timeout after which, if the process is still alive,
|
1348 | b2a1f511 | Iustin Pop | a SIGKILL will be sent. If not positive, no such checking
|
1349 | b2a1f511 | Iustin Pop | will be done
|
1350 | ff5251bc | Iustin Pop | @type waitpid: boolean
|
1351 | ff5251bc | Iustin Pop | @param waitpid: If true, we should waitpid on this process after
|
1352 | ff5251bc | Iustin Pop | sending signals, since it's our own child and otherwise it
|
1353 | ff5251bc | Iustin Pop | would remain as zombie
|
1354 | b2a1f511 | Iustin Pop |
|
1355 | b2a1f511 | Iustin Pop | """
|
1356 | ff5251bc | Iustin Pop | def _helper(pid, signal_, wait): |
1357 | ff5251bc | Iustin Pop | """Simple helper to encapsulate the kill/waitpid sequence"""
|
1358 | 560cbec1 | Michael Hanselmann | if IgnoreProcessNotFound(os.kill, pid, signal_) and wait: |
1359 | ff5251bc | Iustin Pop | try:
|
1360 | ff5251bc | Iustin Pop | os.waitpid(pid, os.WNOHANG) |
1361 | ff5251bc | Iustin Pop | except OSError: |
1362 | ff5251bc | Iustin Pop | pass
|
1363 | ff5251bc | Iustin Pop | |
1364 | b2a1f511 | Iustin Pop | if pid <= 0: |
1365 | b2a1f511 | Iustin Pop | # kill with pid=0 == suicide
|
1366 | b2a1f511 | Iustin Pop | raise errors.ProgrammerError("Invalid pid given '%s'" % pid) |
1367 | b2a1f511 | Iustin Pop | |
1368 | b2a1f511 | Iustin Pop | if not IsProcessAlive(pid): |
1369 | b2a1f511 | Iustin Pop | return
|
1370 | 31892b4c | Michael Hanselmann | |
1371 | ff5251bc | Iustin Pop | _helper(pid, signal_, waitpid) |
1372 | 31892b4c | Michael Hanselmann | |
1373 | b2a1f511 | Iustin Pop | if timeout <= 0: |
1374 | b2a1f511 | Iustin Pop | return
|
1375 | 7167159a | Michael Hanselmann | |
1376 | 31892b4c | Michael Hanselmann | def _CheckProcess(): |
1377 | 31892b4c | Michael Hanselmann | if not IsProcessAlive(pid): |
1378 | 31892b4c | Michael Hanselmann | return
|
1379 | 31892b4c | Michael Hanselmann | |
1380 | 7167159a | Michael Hanselmann | try:
|
1381 | 7167159a | Michael Hanselmann | (result_pid, _) = os.waitpid(pid, os.WNOHANG) |
1382 | 7167159a | Michael Hanselmann | except OSError: |
1383 | 31892b4c | Michael Hanselmann | raise RetryAgain()
|
1384 | 31892b4c | Michael Hanselmann | |
1385 | 31892b4c | Michael Hanselmann | if result_pid > 0: |
1386 | 31892b4c | Michael Hanselmann | return
|
1387 | 31892b4c | Michael Hanselmann | |
1388 | 31892b4c | Michael Hanselmann | raise RetryAgain()
|
1389 | 31892b4c | Michael Hanselmann | |
1390 | 31892b4c | Michael Hanselmann | try:
|
1391 | 31892b4c | Michael Hanselmann | # Wait up to $timeout seconds
|
1392 | 31892b4c | Michael Hanselmann | Retry(_CheckProcess, (0.01, 1.5, 0.1), timeout) |
1393 | 31892b4c | Michael Hanselmann | except RetryTimeout:
|
1394 | 31892b4c | Michael Hanselmann | pass
|
1395 | 7167159a | Michael Hanselmann | |
1396 | b2a1f511 | Iustin Pop | if IsProcessAlive(pid):
|
1397 | 7167159a | Michael Hanselmann | # Kill process if it's still alive
|
1398 | e1bd0072 | Iustin Pop | _helper(pid, signal.SIGKILL, waitpid) |
1399 | b2a1f511 | Iustin Pop | |
1400 | b2a1f511 | Iustin Pop | |
1401 | 8d1a2a64 | Michael Hanselmann | def CheckVolumeGroupSize(vglist, vgname, minsize): |
1402 | 8d1a2a64 | Michael Hanselmann | """Checks if the volume group list is valid.
|
1403 | 8d1a2a64 | Michael Hanselmann |
|
1404 | 58885d79 | Iustin Pop | The function will check if a given volume group is in the list of
|
1405 | 58885d79 | Iustin Pop | volume groups and has a minimum size.
|
1406 | 58885d79 | Iustin Pop |
|
1407 | 58885d79 | Iustin Pop | @type vglist: dict
|
1408 | 58885d79 | Iustin Pop | @param vglist: dictionary of volume group names and their size
|
1409 | 58885d79 | Iustin Pop | @type vgname: str
|
1410 | 58885d79 | Iustin Pop | @param vgname: the volume group we should check
|
1411 | 58885d79 | Iustin Pop | @type minsize: int
|
1412 | 58885d79 | Iustin Pop | @param minsize: the minimum size we accept
|
1413 | 58885d79 | Iustin Pop | @rtype: None or str
|
1414 | 58885d79 | Iustin Pop | @return: None for success, otherwise the error message
|
1415 | 8d1a2a64 | Michael Hanselmann |
|
1416 | 8d1a2a64 | Michael Hanselmann | """
|
1417 | 8d1a2a64 | Michael Hanselmann | vgsize = vglist.get(vgname, None)
|
1418 | 8d1a2a64 | Michael Hanselmann | if vgsize is None: |
1419 | 8d1a2a64 | Michael Hanselmann | return "volume group '%s' missing" % vgname |
1420 | 8d1a2a64 | Michael Hanselmann | elif vgsize < minsize:
|
1421 | 8d1a2a64 | Michael Hanselmann | return ("volume group '%s' too small (%s MiB required, %d MiB found)" % |
1422 | 8d1a2a64 | Michael Hanselmann | (vgname, minsize, vgsize)) |
1423 | 8d1a2a64 | Michael Hanselmann | return None |
1424 | 7996a135 | Iustin Pop | |
1425 | 7996a135 | Iustin Pop | |
1426 | 45bc5e4a | Michael Hanselmann | def SplitTime(value): |
1427 | 739be818 | Michael Hanselmann | """Splits time as floating point number into a tuple.
|
1428 | 739be818 | Michael Hanselmann |
|
1429 | 45bc5e4a | Michael Hanselmann | @param value: Time in seconds
|
1430 | 45bc5e4a | Michael Hanselmann | @type value: int or float
|
1431 | 45bc5e4a | Michael Hanselmann | @return: Tuple containing (seconds, microseconds)
|
1432 | 739be818 | Michael Hanselmann |
|
1433 | 739be818 | Michael Hanselmann | """
|
1434 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = divmod(int(value * 1000000), 1000000) |
1435 | 45bc5e4a | Michael Hanselmann | |
1436 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1437 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
1438 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
1439 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
1440 | 45bc5e4a | Michael Hanselmann | |
1441 | 45bc5e4a | Michael Hanselmann | return (int(seconds), int(microseconds)) |
1442 | 739be818 | Michael Hanselmann | |
1443 | 739be818 | Michael Hanselmann | |
1444 | 739be818 | Michael Hanselmann | def MergeTime(timetuple): |
1445 | 739be818 | Michael Hanselmann | """Merges a tuple into time as a floating point number.
|
1446 | 739be818 | Michael Hanselmann |
|
1447 | 45bc5e4a | Michael Hanselmann | @param timetuple: Time as tuple, (seconds, microseconds)
|
1448 | 739be818 | Michael Hanselmann | @type timetuple: tuple
|
1449 | 739be818 | Michael Hanselmann | @return: Time as a floating point number expressed in seconds
|
1450 | 739be818 | Michael Hanselmann |
|
1451 | 739be818 | Michael Hanselmann | """
|
1452 | 45bc5e4a | Michael Hanselmann | (seconds, microseconds) = timetuple |
1453 | 739be818 | Michael Hanselmann | |
1454 | 45bc5e4a | Michael Hanselmann | assert 0 <= seconds, \ |
1455 | 45bc5e4a | Michael Hanselmann | "Seconds must be larger than or equal to 0, but are %s" % seconds
|
1456 | 45bc5e4a | Michael Hanselmann | assert 0 <= microseconds <= 999999, \ |
1457 | 45bc5e4a | Michael Hanselmann | "Microseconds must be 0-999999, but are %s" % microseconds
|
1458 | 739be818 | Michael Hanselmann | |
1459 | 45bc5e4a | Michael Hanselmann | return float(seconds) + (float(microseconds) * 0.000001) |
1460 | 739be818 | Michael Hanselmann | |
1461 | 739be818 | Michael Hanselmann | |
1462 | 691c81b7 | Michael Hanselmann | def FindMatch(data, name): |
1463 | 691c81b7 | Michael Hanselmann | """Tries to find an item in a dictionary matching a name.
|
1464 | 691c81b7 | Michael Hanselmann |
|
1465 | 691c81b7 | Michael Hanselmann | Callers have to ensure the data names aren't contradictory (e.g. a regexp
|
1466 | 691c81b7 | Michael Hanselmann | that matches a string). If the name isn't a direct key, all regular
|
1467 | 691c81b7 | Michael Hanselmann | expression objects in the dictionary are matched against it.
|
1468 | 691c81b7 | Michael Hanselmann |
|
1469 | 691c81b7 | Michael Hanselmann | @type data: dict
|
1470 | 691c81b7 | Michael Hanselmann | @param data: Dictionary containing data
|
1471 | 691c81b7 | Michael Hanselmann | @type name: string
|
1472 | 691c81b7 | Michael Hanselmann | @param name: Name to look for
|
1473 | 691c81b7 | Michael Hanselmann | @rtype: tuple; (value in dictionary, matched groups as list)
|
1474 | 691c81b7 | Michael Hanselmann |
|
1475 | 691c81b7 | Michael Hanselmann | """
|
1476 | 691c81b7 | Michael Hanselmann | if name in data: |
1477 | 691c81b7 | Michael Hanselmann | return (data[name], [])
|
1478 | 691c81b7 | Michael Hanselmann | |
1479 | 691c81b7 | Michael Hanselmann | for key, value in data.items(): |
1480 | 691c81b7 | Michael Hanselmann | # Regex objects
|
1481 | 691c81b7 | Michael Hanselmann | if hasattr(key, "match"): |
1482 | 691c81b7 | Michael Hanselmann | m = key.match(name) |
1483 | 691c81b7 | Michael Hanselmann | if m:
|
1484 | 691c81b7 | Michael Hanselmann | return (value, list(m.groups())) |
1485 | 691c81b7 | Michael Hanselmann | |
1486 | 691c81b7 | Michael Hanselmann | return None |
1487 | 691c81b7 | Michael Hanselmann | |
1488 | 691c81b7 | Michael Hanselmann | |
1489 | 1b045f5d | Balazs Lecz | def GetMounts(filename=constants.PROC_MOUNTS): |
1490 | 1b045f5d | Balazs Lecz | """Returns the list of mounted filesystems.
|
1491 | 1b045f5d | Balazs Lecz |
|
1492 | 1b045f5d | Balazs Lecz | This function is Linux-specific.
|
1493 | 1b045f5d | Balazs Lecz |
|
1494 | 1b045f5d | Balazs Lecz | @param filename: path of mounts file (/proc/mounts by default)
|
1495 | 1b045f5d | Balazs Lecz | @rtype: list of tuples
|
1496 | 1b045f5d | Balazs Lecz | @return: list of mount entries (device, mountpoint, fstype, options)
|
1497 | 1b045f5d | Balazs Lecz |
|
1498 | 1b045f5d | Balazs Lecz | """
|
1499 | 1b045f5d | Balazs Lecz | # TODO(iustin): investigate non-Linux options (e.g. via mount output)
|
1500 | 1b045f5d | Balazs Lecz | data = [] |
1501 | 1b045f5d | Balazs Lecz | mountlines = ReadFile(filename).splitlines() |
1502 | 1b045f5d | Balazs Lecz | for line in mountlines: |
1503 | 1b045f5d | Balazs Lecz | device, mountpoint, fstype, options, _ = line.split(None, 4) |
1504 | 1b045f5d | Balazs Lecz | data.append((device, mountpoint, fstype, options)) |
1505 | 1b045f5d | Balazs Lecz | |
1506 | 1b045f5d | Balazs Lecz | return data
|
1507 | 1b045f5d | Balazs Lecz | |
1508 | 1b045f5d | Balazs Lecz | |
1509 | bdefe5dd | Michael Hanselmann | def RunInSeparateProcess(fn, *args): |
1510 | eb58f7bd | Michael Hanselmann | """Runs a function in a separate process.
|
1511 | eb58f7bd | Michael Hanselmann |
|
1512 | eb58f7bd | Michael Hanselmann | Note: Only boolean return values are supported.
|
1513 | eb58f7bd | Michael Hanselmann |
|
1514 | eb58f7bd | Michael Hanselmann | @type fn: callable
|
1515 | eb58f7bd | Michael Hanselmann | @param fn: Function to be called
|
1516 | bdefe5dd | Michael Hanselmann | @rtype: bool
|
1517 | bdefe5dd | Michael Hanselmann | @return: Function's result
|
1518 | eb58f7bd | Michael Hanselmann |
|
1519 | eb58f7bd | Michael Hanselmann | """
|
1520 | eb58f7bd | Michael Hanselmann | pid = os.fork() |
1521 | eb58f7bd | Michael Hanselmann | if pid == 0: |
1522 | eb58f7bd | Michael Hanselmann | # Child process
|
1523 | eb58f7bd | Michael Hanselmann | try:
|
1524 | 82869978 | Michael Hanselmann | # In case the function uses temporary files
|
1525 | 82869978 | Michael Hanselmann | ResetTempfileModule() |
1526 | 82869978 | Michael Hanselmann | |
1527 | eb58f7bd | Michael Hanselmann | # Call function
|
1528 | bdefe5dd | Michael Hanselmann | result = int(bool(fn(*args))) |
1529 | eb58f7bd | Michael Hanselmann | assert result in (0, 1) |
1530 | eb58f7bd | Michael Hanselmann | except: # pylint: disable-msg=W0702 |
1531 | eb58f7bd | Michael Hanselmann | logging.exception("Error while calling function in separate process")
|
1532 | eb58f7bd | Michael Hanselmann | # 0 and 1 are reserved for the return value
|
1533 | eb58f7bd | Michael Hanselmann | result = 33
|
1534 | eb58f7bd | Michael Hanselmann | |
1535 | eb58f7bd | Michael Hanselmann | os._exit(result) # pylint: disable-msg=W0212
|
1536 | eb58f7bd | Michael Hanselmann | |
1537 | eb58f7bd | Michael Hanselmann | # Parent process
|
1538 | eb58f7bd | Michael Hanselmann | |
1539 | eb58f7bd | Michael Hanselmann | # Avoid zombies and check exit code
|
1540 | eb58f7bd | Michael Hanselmann | (_, status) = os.waitpid(pid, 0)
|
1541 | eb58f7bd | Michael Hanselmann | |
1542 | eb58f7bd | Michael Hanselmann | if os.WIFSIGNALED(status):
|
1543 | eb58f7bd | Michael Hanselmann | exitcode = None
|
1544 | eb58f7bd | Michael Hanselmann | signum = os.WTERMSIG(status) |
1545 | eb58f7bd | Michael Hanselmann | else:
|
1546 | eb58f7bd | Michael Hanselmann | exitcode = os.WEXITSTATUS(status) |
1547 | eb58f7bd | Michael Hanselmann | signum = None
|
1548 | eb58f7bd | Michael Hanselmann | |
1549 | eb58f7bd | Michael Hanselmann | if not (exitcode in (0, 1) and signum is None): |
1550 | eb58f7bd | Michael Hanselmann | raise errors.GenericError("Child program failed (code=%s, signal=%s)" % |
1551 | eb58f7bd | Michael Hanselmann | (exitcode, signum)) |
1552 | eb58f7bd | Michael Hanselmann | |
1553 | eb58f7bd | Michael Hanselmann | return bool(exitcode) |
1554 | eb58f7bd | Michael Hanselmann | |
1555 | eb58f7bd | Michael Hanselmann | |
1556 | 451575de | Guido Trotter | def SignalHandled(signums): |
1557 | 451575de | Guido Trotter | """Signal Handled decoration.
|
1558 | 451575de | Guido Trotter |
|
1559 | 451575de | Guido Trotter | This special decorator installs a signal handler and then calls the target
|
1560 | 451575de | Guido Trotter | function. The function must accept a 'signal_handlers' keyword argument,
|
1561 | 451575de | Guido Trotter | which will contain a dict indexed by signal number, with SignalHandler
|
1562 | 451575de | Guido Trotter | objects as values.
|
1563 | 451575de | Guido Trotter |
|
1564 | 451575de | Guido Trotter | The decorator can be safely stacked with iself, to handle multiple signals
|
1565 | 451575de | Guido Trotter | with different handlers.
|
1566 | 451575de | Guido Trotter |
|
1567 | 451575de | Guido Trotter | @type signums: list
|
1568 | 451575de | Guido Trotter | @param signums: signals to intercept
|
1569 | 451575de | Guido Trotter |
|
1570 | 451575de | Guido Trotter | """
|
1571 | 451575de | Guido Trotter | def wrap(fn): |
1572 | 451575de | Guido Trotter | def sig_function(*args, **kwargs): |
1573 | 451575de | Guido Trotter | assert 'signal_handlers' not in kwargs or \ |
1574 | 451575de | Guido Trotter | kwargs['signal_handlers'] is None or \ |
1575 | 451575de | Guido Trotter | isinstance(kwargs['signal_handlers'], dict), \ |
1576 | 451575de | Guido Trotter | "Wrong signal_handlers parameter in original function call"
|
1577 | 451575de | Guido Trotter | if 'signal_handlers' in kwargs and kwargs['signal_handlers'] is not None: |
1578 | 451575de | Guido Trotter | signal_handlers = kwargs['signal_handlers']
|
1579 | 451575de | Guido Trotter | else:
|
1580 | 451575de | Guido Trotter | signal_handlers = {} |
1581 | 451575de | Guido Trotter | kwargs['signal_handlers'] = signal_handlers
|
1582 | 451575de | Guido Trotter | sighandler = SignalHandler(signums) |
1583 | 451575de | Guido Trotter | try:
|
1584 | 451575de | Guido Trotter | for sig in signums: |
1585 | 451575de | Guido Trotter | signal_handlers[sig] = sighandler |
1586 | 451575de | Guido Trotter | return fn(*args, **kwargs)
|
1587 | 451575de | Guido Trotter | finally:
|
1588 | 451575de | Guido Trotter | sighandler.Reset() |
1589 | 451575de | Guido Trotter | return sig_function
|
1590 | 451575de | Guido Trotter | return wrap
|
1591 | 451575de | Guido Trotter | |
1592 | 451575de | Guido Trotter | |
1593 | b9768937 | Michael Hanselmann | class SignalWakeupFd(object): |
1594 | b9768937 | Michael Hanselmann | try:
|
1595 | b9768937 | Michael Hanselmann | # This is only supported in Python 2.5 and above (some distributions
|
1596 | b9768937 | Michael Hanselmann | # backported it to Python 2.4)
|
1597 | b9768937 | Michael Hanselmann | _set_wakeup_fd_fn = signal.set_wakeup_fd |
1598 | b9768937 | Michael Hanselmann | except AttributeError: |
1599 | b9768937 | Michael Hanselmann | # Not supported
|
1600 | b9768937 | Michael Hanselmann | def _SetWakeupFd(self, _): # pylint: disable-msg=R0201 |
1601 | b9768937 | Michael Hanselmann | return -1 |
1602 | b9768937 | Michael Hanselmann | else:
|
1603 | b9768937 | Michael Hanselmann | def _SetWakeupFd(self, fd): |
1604 | b9768937 | Michael Hanselmann | return self._set_wakeup_fd_fn(fd) |
1605 | b9768937 | Michael Hanselmann | |
1606 | b9768937 | Michael Hanselmann | def __init__(self): |
1607 | b9768937 | Michael Hanselmann | """Initializes this class.
|
1608 | b9768937 | Michael Hanselmann |
|
1609 | b9768937 | Michael Hanselmann | """
|
1610 | b9768937 | Michael Hanselmann | (read_fd, write_fd) = os.pipe() |
1611 | b9768937 | Michael Hanselmann | |
1612 | b9768937 | Michael Hanselmann | # Once these succeeded, the file descriptors will be closed automatically.
|
1613 | b9768937 | Michael Hanselmann | # Buffer size 0 is important, otherwise .read() with a specified length
|
1614 | b9768937 | Michael Hanselmann | # might buffer data and the file descriptors won't be marked readable.
|
1615 | b9768937 | Michael Hanselmann | self._read_fh = os.fdopen(read_fd, "r", 0) |
1616 | b9768937 | Michael Hanselmann | self._write_fh = os.fdopen(write_fd, "w", 0) |
1617 | b9768937 | Michael Hanselmann | |
1618 | b9768937 | Michael Hanselmann | self._previous = self._SetWakeupFd(self._write_fh.fileno()) |
1619 | b9768937 | Michael Hanselmann | |
1620 | b9768937 | Michael Hanselmann | # Utility functions
|
1621 | b9768937 | Michael Hanselmann | self.fileno = self._read_fh.fileno |
1622 | b9768937 | Michael Hanselmann | self.read = self._read_fh.read |
1623 | b9768937 | Michael Hanselmann | |
1624 | b9768937 | Michael Hanselmann | def Reset(self): |
1625 | b9768937 | Michael Hanselmann | """Restores the previous wakeup file descriptor.
|
1626 | b9768937 | Michael Hanselmann |
|
1627 | b9768937 | Michael Hanselmann | """
|
1628 | b9768937 | Michael Hanselmann | if hasattr(self, "_previous") and self._previous is not None: |
1629 | b9768937 | Michael Hanselmann | self._SetWakeupFd(self._previous) |
1630 | b9768937 | Michael Hanselmann | self._previous = None |
1631 | b9768937 | Michael Hanselmann | |
1632 | b9768937 | Michael Hanselmann | def Notify(self): |
1633 | b9768937 | Michael Hanselmann | """Notifies the wakeup file descriptor.
|
1634 | b9768937 | Michael Hanselmann |
|
1635 | b9768937 | Michael Hanselmann | """
|
1636 | b9768937 | Michael Hanselmann | self._write_fh.write("\0") |
1637 | b9768937 | Michael Hanselmann | |
1638 | b9768937 | Michael Hanselmann | def __del__(self): |
1639 | b9768937 | Michael Hanselmann | """Called before object deletion.
|
1640 | b9768937 | Michael Hanselmann |
|
1641 | b9768937 | Michael Hanselmann | """
|
1642 | b9768937 | Michael Hanselmann | self.Reset()
|
1643 | b9768937 | Michael Hanselmann | |
1644 | b9768937 | Michael Hanselmann | |
1645 | de499029 | Michael Hanselmann | class SignalHandler(object): |
1646 | de499029 | Michael Hanselmann | """Generic signal handler class.
|
1647 | de499029 | Michael Hanselmann |
|
1648 | 58885d79 | Iustin Pop | It automatically restores the original handler when deconstructed or
|
1649 | 58885d79 | Iustin Pop | when L{Reset} is called. You can either pass your own handler
|
1650 | 58885d79 | Iustin Pop | function in or query the L{called} attribute to detect whether the
|
1651 | 58885d79 | Iustin Pop | signal was sent.
|
1652 | 58885d79 | Iustin Pop |
|
1653 | 58885d79 | Iustin Pop | @type signum: list
|
1654 | 58885d79 | Iustin Pop | @ivar signum: the signals we handle
|
1655 | 58885d79 | Iustin Pop | @type called: boolean
|
1656 | 58885d79 | Iustin Pop | @ivar called: tracks whether any of the signals have been raised
|
1657 | de499029 | Michael Hanselmann |
|
1658 | de499029 | Michael Hanselmann | """
|
1659 | b9768937 | Michael Hanselmann | def __init__(self, signum, handler_fn=None, wakeup=None): |
1660 | de499029 | Michael Hanselmann | """Constructs a new SignalHandler instance.
|
1661 | de499029 | Michael Hanselmann |
|
1662 | 58885d79 | Iustin Pop | @type signum: int or list of ints
|
1663 | de499029 | Michael Hanselmann | @param signum: Single signal number or set of signal numbers
|
1664 | 92b61ec7 | Michael Hanselmann | @type handler_fn: callable
|
1665 | 92b61ec7 | Michael Hanselmann | @param handler_fn: Signal handling function
|
1666 | de499029 | Michael Hanselmann |
|
1667 | de499029 | Michael Hanselmann | """
|
1668 | 92b61ec7 | Michael Hanselmann | assert handler_fn is None or callable(handler_fn) |
1669 | 92b61ec7 | Michael Hanselmann | |
1670 | 6c52849e | Guido Trotter | self.signum = set(signum) |
1671 | de499029 | Michael Hanselmann | self.called = False |
1672 | de499029 | Michael Hanselmann | |
1673 | 92b61ec7 | Michael Hanselmann | self._handler_fn = handler_fn
|
1674 | b9768937 | Michael Hanselmann | self._wakeup = wakeup
|
1675 | 92b61ec7 | Michael Hanselmann | |
1676 | de499029 | Michael Hanselmann | self._previous = {}
|
1677 | de499029 | Michael Hanselmann | try:
|
1678 | de499029 | Michael Hanselmann | for signum in self.signum: |
1679 | de499029 | Michael Hanselmann | # Setup handler
|
1680 | de499029 | Michael Hanselmann | prev_handler = signal.signal(signum, self._HandleSignal)
|
1681 | de499029 | Michael Hanselmann | try:
|
1682 | de499029 | Michael Hanselmann | self._previous[signum] = prev_handler
|
1683 | de499029 | Michael Hanselmann | except:
|
1684 | de499029 | Michael Hanselmann | # Restore previous handler
|
1685 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
1686 | de499029 | Michael Hanselmann | raise
|
1687 | de499029 | Michael Hanselmann | except:
|
1688 | de499029 | Michael Hanselmann | # Reset all handlers
|
1689 | de499029 | Michael Hanselmann | self.Reset()
|
1690 | de499029 | Michael Hanselmann | # Here we have a race condition: a handler may have already been called,
|
1691 | de499029 | Michael Hanselmann | # but there's not much we can do about it at this point.
|
1692 | de499029 | Michael Hanselmann | raise
|
1693 | de499029 | Michael Hanselmann | |
1694 | de499029 | Michael Hanselmann | def __del__(self): |
1695 | de499029 | Michael Hanselmann | self.Reset()
|
1696 | de499029 | Michael Hanselmann | |
1697 | de499029 | Michael Hanselmann | def Reset(self): |
1698 | de499029 | Michael Hanselmann | """Restore previous handler.
|
1699 | de499029 | Michael Hanselmann |
|
1700 | 58885d79 | Iustin Pop | This will reset all the signals to their previous handlers.
|
1701 | 58885d79 | Iustin Pop |
|
1702 | de499029 | Michael Hanselmann | """
|
1703 | de499029 | Michael Hanselmann | for signum, prev_handler in self._previous.items(): |
1704 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
1705 | de499029 | Michael Hanselmann | # If successful, remove from dict
|
1706 | de499029 | Michael Hanselmann | del self._previous[signum] |
1707 | de499029 | Michael Hanselmann | |
1708 | de499029 | Michael Hanselmann | def Clear(self): |
1709 | 58885d79 | Iustin Pop | """Unsets the L{called} flag.
|
1710 | de499029 | Michael Hanselmann |
|
1711 | de499029 | Michael Hanselmann | This function can be used in case a signal may arrive several times.
|
1712 | de499029 | Michael Hanselmann |
|
1713 | de499029 | Michael Hanselmann | """
|
1714 | de499029 | Michael Hanselmann | self.called = False |
1715 | de499029 | Michael Hanselmann | |
1716 | 92b61ec7 | Michael Hanselmann | def _HandleSignal(self, signum, frame): |
1717 | de499029 | Michael Hanselmann | """Actual signal handling function.
|
1718 | de499029 | Michael Hanselmann |
|
1719 | de499029 | Michael Hanselmann | """
|
1720 | de499029 | Michael Hanselmann | # This is not nice and not absolutely atomic, but it appears to be the only
|
1721 | de499029 | Michael Hanselmann | # solution in Python -- there are no atomic types.
|
1722 | de499029 | Michael Hanselmann | self.called = True |
1723 | a2d2e1a7 | Iustin Pop | |
1724 | b9768937 | Michael Hanselmann | if self._wakeup: |
1725 | b9768937 | Michael Hanselmann | # Notify whoever is interested in signals
|
1726 | b9768937 | Michael Hanselmann | self._wakeup.Notify()
|
1727 | b9768937 | Michael Hanselmann | |
1728 | 92b61ec7 | Michael Hanselmann | if self._handler_fn: |
1729 | 92b61ec7 | Michael Hanselmann | self._handler_fn(signum, frame)
|
1730 | 92b61ec7 | Michael Hanselmann | |
1731 | a2d2e1a7 | Iustin Pop | |
1732 | a2d2e1a7 | Iustin Pop | class FieldSet(object): |
1733 | a2d2e1a7 | Iustin Pop | """A simple field set.
|
1734 | a2d2e1a7 | Iustin Pop |
|
1735 | a2d2e1a7 | Iustin Pop | Among the features are:
|
1736 | a2d2e1a7 | Iustin Pop | - checking if a string is among a list of static string or regex objects
|
1737 | a2d2e1a7 | Iustin Pop | - checking if a whole list of string matches
|
1738 | a2d2e1a7 | Iustin Pop | - returning the matching groups from a regex match
|
1739 | a2d2e1a7 | Iustin Pop |
|
1740 | a2d2e1a7 | Iustin Pop | Internally, all fields are held as regular expression objects.
|
1741 | a2d2e1a7 | Iustin Pop |
|
1742 | a2d2e1a7 | Iustin Pop | """
|
1743 | a2d2e1a7 | Iustin Pop | def __init__(self, *items): |
1744 | a2d2e1a7 | Iustin Pop | self.items = [re.compile("^%s$" % value) for value in items] |
1745 | a2d2e1a7 | Iustin Pop | |
1746 | a2d2e1a7 | Iustin Pop | def Extend(self, other_set): |
1747 | a2d2e1a7 | Iustin Pop | """Extend the field set with the items from another one"""
|
1748 | a2d2e1a7 | Iustin Pop | self.items.extend(other_set.items)
|
1749 | a2d2e1a7 | Iustin Pop | |
1750 | a2d2e1a7 | Iustin Pop | def Matches(self, field): |
1751 | a2d2e1a7 | Iustin Pop | """Checks if a field matches the current set
|
1752 | a2d2e1a7 | Iustin Pop |
|
1753 | a2d2e1a7 | Iustin Pop | @type field: str
|
1754 | a2d2e1a7 | Iustin Pop | @param field: the string to match
|
1755 | 6c881c52 | Iustin Pop | @return: either None or a regular expression match object
|
1756 | a2d2e1a7 | Iustin Pop |
|
1757 | a2d2e1a7 | Iustin Pop | """
|
1758 | a2d2e1a7 | Iustin Pop | for m in itertools.ifilter(None, (val.match(field) for val in self.items)): |
1759 | a2d2e1a7 | Iustin Pop | return m
|
1760 | 6c881c52 | Iustin Pop | return None |
1761 | a2d2e1a7 | Iustin Pop | |
1762 | a2d2e1a7 | Iustin Pop | def NonMatching(self, items): |
1763 | a2d2e1a7 | Iustin Pop | """Returns the list of fields not matching the current set
|
1764 | a2d2e1a7 | Iustin Pop |
|
1765 | a2d2e1a7 | Iustin Pop | @type items: list
|
1766 | a2d2e1a7 | Iustin Pop | @param items: the list of fields to check
|
1767 | a2d2e1a7 | Iustin Pop | @rtype: list
|
1768 | a2d2e1a7 | Iustin Pop | @return: list of non-matching fields
|
1769 | a2d2e1a7 | Iustin Pop |
|
1770 | a2d2e1a7 | Iustin Pop | """
|
1771 | a2d2e1a7 | Iustin Pop | return [val for val in items if not self.Matches(val)] |