root / lib / utils.py @ 6c8af3d0
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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | a8083063 | Iustin Pop | # Copyright (C) 2006, 2007 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Ganeti small utilities
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23 | 899d2a81 | Michael Hanselmann |
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24 | a8083063 | Iustin Pop | """
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25 | a8083063 | Iustin Pop | |
26 | a8083063 | Iustin Pop | |
27 | a8083063 | Iustin Pop | import sys |
28 | a8083063 | Iustin Pop | import os |
29 | a8083063 | Iustin Pop | import sha |
30 | a8083063 | Iustin Pop | import time |
31 | 113b55aa | Iustin Pop | import subprocess |
32 | a8083063 | Iustin Pop | import re |
33 | a8083063 | Iustin Pop | import socket |
34 | a8083063 | Iustin Pop | import tempfile |
35 | a8083063 | Iustin Pop | import shutil |
36 | 4ca1b175 | Alexander Schreiber | import errno |
37 | 2f8b60b3 | Iustin Pop | import pwd |
38 | 78feb6fb | Guido Trotter | import itertools |
39 | 9c233417 | Iustin Pop | import select |
40 | 9c233417 | Iustin Pop | import fcntl |
41 | 9c233417 | Iustin Pop | |
42 | 9c233417 | Iustin Pop | from cStringIO import StringIO |
43 | a8083063 | Iustin Pop | |
44 | a8083063 | Iustin Pop | from ganeti import logger |
45 | a8083063 | Iustin Pop | from ganeti import errors |
46 | 3aecd2c7 | Iustin Pop | from ganeti import constants |
47 | a8083063 | Iustin Pop | |
48 | 16abfbc2 | Alexander Schreiber | |
49 | a8083063 | Iustin Pop | _locksheld = [] |
50 | a8083063 | Iustin Pop | _re_shell_unquoted = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
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51 | a8083063 | Iustin Pop | |
52 | f362096f | Iustin Pop | debug = False
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53 | f362096f | Iustin Pop | |
54 | a8083063 | Iustin Pop | class RunResult(object): |
55 | a8083063 | Iustin Pop | """Simple class for holding the result of running external programs.
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56 | a8083063 | Iustin Pop |
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57 | a8083063 | Iustin Pop | Instance variables:
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58 | a8083063 | Iustin Pop | exit_code: the exit code of the program, or None (if the program
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59 | a8083063 | Iustin Pop | didn't exit())
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60 | a8083063 | Iustin Pop | signal: numeric signal that caused the program to finish, or None
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61 | a8083063 | Iustin Pop | (if the program wasn't terminated by a signal)
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62 | a8083063 | Iustin Pop | stdout: the standard output of the program
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63 | a8083063 | Iustin Pop | stderr: the standard error of the program
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64 | a8083063 | Iustin Pop | failed: a Boolean value which is True in case the program was
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65 | a8083063 | Iustin Pop | terminated by a signal or exited with a non-zero exit code
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66 | a8083063 | Iustin Pop | fail_reason: a string detailing the termination reason
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67 | a8083063 | Iustin Pop |
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68 | a8083063 | Iustin Pop | """
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69 | a8083063 | Iustin Pop | __slots__ = ["exit_code", "signal", "stdout", "stderr", |
70 | a8083063 | Iustin Pop | "failed", "fail_reason", "cmd"] |
71 | a8083063 | Iustin Pop | |
72 | a8083063 | Iustin Pop | |
73 | a8083063 | Iustin Pop | def __init__(self, exit_code, signal, stdout, stderr, cmd): |
74 | a8083063 | Iustin Pop | self.cmd = cmd
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75 | a8083063 | Iustin Pop | self.exit_code = exit_code
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76 | a8083063 | Iustin Pop | self.signal = signal
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77 | a8083063 | Iustin Pop | self.stdout = stdout
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78 | a8083063 | Iustin Pop | self.stderr = stderr
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79 | a8083063 | Iustin Pop | self.failed = (signal is not None or exit_code != 0) |
80 | a8083063 | Iustin Pop | |
81 | a8083063 | Iustin Pop | if self.signal is not None: |
82 | a8083063 | Iustin Pop | self.fail_reason = "terminated by signal %s" % self.signal |
83 | a8083063 | Iustin Pop | elif self.exit_code is not None: |
84 | a8083063 | Iustin Pop | self.fail_reason = "exited with exit code %s" % self.exit_code |
85 | a8083063 | Iustin Pop | else:
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86 | a8083063 | Iustin Pop | self.fail_reason = "unable to determine termination reason" |
87 | a8083063 | Iustin Pop | |
88 | f362096f | Iustin Pop | if debug and self.failed: |
89 | f362096f | Iustin Pop | logger.Debug("Command '%s' failed (%s); output: %s" %
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90 | f362096f | Iustin Pop | (self.cmd, self.fail_reason, self.output)) |
91 | f362096f | Iustin Pop | |
92 | a8083063 | Iustin Pop | def _GetOutput(self): |
93 | a8083063 | Iustin Pop | """Returns the combined stdout and stderr for easier usage.
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94 | a8083063 | Iustin Pop |
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95 | a8083063 | Iustin Pop | """
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96 | a8083063 | Iustin Pop | return self.stdout + self.stderr |
97 | a8083063 | Iustin Pop | |
98 | a8083063 | Iustin Pop | output = property(_GetOutput, None, None, "Return full output") |
99 | a8083063 | Iustin Pop | |
100 | a8083063 | Iustin Pop | |
101 | a8083063 | Iustin Pop | def _GetLockFile(subsystem): |
102 | a8083063 | Iustin Pop | """Compute the file name for a given lock name."""
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103 | 3aecd2c7 | Iustin Pop | return "%s/ganeti_lock_%s" % (constants.LOCK_DIR, subsystem) |
104 | a8083063 | Iustin Pop | |
105 | a8083063 | Iustin Pop | |
106 | a8083063 | Iustin Pop | def Lock(name, max_retries=None, debug=False): |
107 | a8083063 | Iustin Pop | """Lock a given subsystem.
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108 | a8083063 | Iustin Pop |
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109 | a8083063 | Iustin Pop | In case the lock is already held by an alive process, the function
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110 | a8083063 | Iustin Pop | will sleep indefintely and poll with a one second interval.
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111 | a8083063 | Iustin Pop |
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112 | a8083063 | Iustin Pop | When the optional integer argument 'max_retries' is passed with a
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113 | a8083063 | Iustin Pop | non-zero value, the function will sleep only for this number of
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114 | a8083063 | Iustin Pop | times, and then it will will raise a LockError if the lock can't be
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115 | a8083063 | Iustin Pop | acquired. Passing in a negative number will cause only one try to
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116 | a8083063 | Iustin Pop | get the lock. Passing a positive number will make the function retry
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117 | a8083063 | Iustin Pop | for approximately that number of seconds.
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118 | a8083063 | Iustin Pop |
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119 | a8083063 | Iustin Pop | """
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120 | a8083063 | Iustin Pop | lockfile = _GetLockFile(name) |
121 | a8083063 | Iustin Pop | |
122 | a8083063 | Iustin Pop | if name in _locksheld: |
123 | a8083063 | Iustin Pop | raise errors.LockError('Lock "%s" already held!' % (name,)) |
124 | a8083063 | Iustin Pop | |
125 | a8083063 | Iustin Pop | errcount = 0
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126 | a8083063 | Iustin Pop | |
127 | a8083063 | Iustin Pop | retries = 0
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128 | a8083063 | Iustin Pop | while True: |
129 | a8083063 | Iustin Pop | try:
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130 | a8083063 | Iustin Pop | fd = os.open(lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR | os.O_SYNC) |
131 | a8083063 | Iustin Pop | break
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132 | a8083063 | Iustin Pop | except OSError, creat_err: |
133 | 4ca1b175 | Alexander Schreiber | if creat_err.errno != errno.EEXIST:
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134 | 3ecf6786 | Iustin Pop | raise errors.LockError("Can't create the lock file. Error '%s'." % |
135 | 3ecf6786 | Iustin Pop | str(creat_err))
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136 | a8083063 | Iustin Pop | |
137 | a8083063 | Iustin Pop | try:
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138 | a8083063 | Iustin Pop | pf = open(lockfile, 'r') |
139 | a8083063 | Iustin Pop | except IOError, open_err: |
140 | a8083063 | Iustin Pop | errcount += 1
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141 | a8083063 | Iustin Pop | if errcount >= 5: |
142 | 3ecf6786 | Iustin Pop | raise errors.LockError("Lock file exists but cannot be opened." |
143 | 3ecf6786 | Iustin Pop | " Error: '%s'." % str(open_err)) |
144 | a8083063 | Iustin Pop | time.sleep(1)
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145 | a8083063 | Iustin Pop | continue
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146 | a8083063 | Iustin Pop | |
147 | a8083063 | Iustin Pop | try:
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148 | a8083063 | Iustin Pop | pid = int(pf.read())
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149 | a8083063 | Iustin Pop | except ValueError: |
150 | 3ecf6786 | Iustin Pop | raise errors.LockError("Invalid pid string in %s" % |
151 | a8083063 | Iustin Pop | (lockfile,)) |
152 | a8083063 | Iustin Pop | |
153 | a8083063 | Iustin Pop | if not IsProcessAlive(pid): |
154 | 3ecf6786 | Iustin Pop | raise errors.LockError("Stale lockfile %s for pid %d?" % |
155 | 3ecf6786 | Iustin Pop | (lockfile, pid)) |
156 | a8083063 | Iustin Pop | |
157 | a8083063 | Iustin Pop | if max_retries and max_retries <= retries: |
158 | 3ecf6786 | Iustin Pop | raise errors.LockError("Can't acquire lock during the specified" |
159 | 3ecf6786 | Iustin Pop | " time, aborting.")
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160 | a8083063 | Iustin Pop | if retries == 5 and (debug or sys.stdin.isatty()): |
161 | a8083063 | Iustin Pop | logger.ToStderr("Waiting for '%s' lock from pid %d..." % (name, pid))
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162 | a8083063 | Iustin Pop | |
163 | a8083063 | Iustin Pop | time.sleep(1)
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164 | a8083063 | Iustin Pop | retries += 1
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165 | a8083063 | Iustin Pop | continue
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166 | a8083063 | Iustin Pop | |
167 | a8083063 | Iustin Pop | os.write(fd, '%d\n' % (os.getpid(),))
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168 | a8083063 | Iustin Pop | os.close(fd) |
169 | a8083063 | Iustin Pop | |
170 | a8083063 | Iustin Pop | _locksheld.append(name) |
171 | a8083063 | Iustin Pop | |
172 | a8083063 | Iustin Pop | |
173 | a8083063 | Iustin Pop | def Unlock(name): |
174 | 098c0958 | Michael Hanselmann | """Unlock a given subsystem.
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175 | a8083063 | Iustin Pop |
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176 | 098c0958 | Michael Hanselmann | """
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177 | a8083063 | Iustin Pop | lockfile = _GetLockFile(name) |
178 | a8083063 | Iustin Pop | |
179 | a8083063 | Iustin Pop | try:
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180 | a8083063 | Iustin Pop | fd = os.open(lockfile, os.O_RDONLY) |
181 | a8083063 | Iustin Pop | except OSError: |
182 | a8083063 | Iustin Pop | raise errors.LockError('Lock "%s" not held.' % (name,)) |
183 | a8083063 | Iustin Pop | |
184 | a8083063 | Iustin Pop | f = os.fdopen(fd, 'r')
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185 | a8083063 | Iustin Pop | pid_str = f.read() |
186 | a8083063 | Iustin Pop | |
187 | a8083063 | Iustin Pop | try:
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188 | a8083063 | Iustin Pop | pid = int(pid_str)
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189 | a8083063 | Iustin Pop | except ValueError: |
190 | a8083063 | Iustin Pop | raise errors.LockError('Unable to determine PID of locking process.') |
191 | a8083063 | Iustin Pop | |
192 | a8083063 | Iustin Pop | if pid != os.getpid():
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193 | a8083063 | Iustin Pop | raise errors.LockError('Lock not held by me (%d != %d)' % |
194 | a8083063 | Iustin Pop | (os.getpid(), pid,)) |
195 | a8083063 | Iustin Pop | |
196 | a8083063 | Iustin Pop | os.unlink(lockfile) |
197 | a8083063 | Iustin Pop | _locksheld.remove(name) |
198 | a8083063 | Iustin Pop | |
199 | a8083063 | Iustin Pop | |
200 | a8083063 | Iustin Pop | def LockCleanup(): |
201 | 098c0958 | Michael Hanselmann | """Remove all locks.
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202 | a8083063 | Iustin Pop |
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203 | 098c0958 | Michael Hanselmann | """
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204 | a8083063 | Iustin Pop | for lock in _locksheld: |
205 | a8083063 | Iustin Pop | Unlock(lock) |
206 | a8083063 | Iustin Pop | |
207 | a8083063 | Iustin Pop | |
208 | a8083063 | Iustin Pop | def RunCmd(cmd): |
209 | a8083063 | Iustin Pop | """Execute a (shell) command.
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210 | a8083063 | Iustin Pop |
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211 | a8083063 | Iustin Pop | The command should not read from its standard input, as it will be
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212 | a8083063 | Iustin Pop | closed.
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213 | a8083063 | Iustin Pop |
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214 | a8083063 | Iustin Pop | Args:
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215 | a8083063 | Iustin Pop | cmd: command to run. (str)
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216 | a8083063 | Iustin Pop |
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217 | a8083063 | Iustin Pop | Returns: `RunResult` instance
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218 | a8083063 | Iustin Pop |
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219 | a8083063 | Iustin Pop | """
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220 | a8083063 | Iustin Pop | if isinstance(cmd, list): |
221 | a8083063 | Iustin Pop | cmd = [str(val) for val in cmd] |
222 | 113b55aa | Iustin Pop | strcmd = " ".join(cmd)
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223 | 113b55aa | Iustin Pop | shell = False
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224 | 113b55aa | Iustin Pop | else:
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225 | 113b55aa | Iustin Pop | strcmd = cmd |
226 | 113b55aa | Iustin Pop | shell = True
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227 | 23f41a3e | Michael Hanselmann | env = os.environ.copy() |
228 | 23f41a3e | Michael Hanselmann | env["LC_ALL"] = "C" |
229 | 9c233417 | Iustin Pop | poller = select.poll() |
230 | 113b55aa | Iustin Pop | child = subprocess.Popen(cmd, shell=shell, |
231 | 113b55aa | Iustin Pop | stderr=subprocess.PIPE, |
232 | 113b55aa | Iustin Pop | stdout=subprocess.PIPE, |
233 | 113b55aa | Iustin Pop | stdin=subprocess.PIPE, |
234 | 23f41a3e | Michael Hanselmann | close_fds=True, env=env)
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235 | 113b55aa | Iustin Pop | |
236 | 113b55aa | Iustin Pop | child.stdin.close() |
237 | 9c233417 | Iustin Pop | poller.register(child.stdout, select.POLLIN) |
238 | 9c233417 | Iustin Pop | poller.register(child.stderr, select.POLLIN) |
239 | 9c233417 | Iustin Pop | out = StringIO() |
240 | 9c233417 | Iustin Pop | err = StringIO() |
241 | 9c233417 | Iustin Pop | fdmap = { |
242 | 9c233417 | Iustin Pop | child.stdout.fileno(): (out, child.stdout), |
243 | 9c233417 | Iustin Pop | child.stderr.fileno(): (err, child.stderr), |
244 | 9c233417 | Iustin Pop | } |
245 | 9c233417 | Iustin Pop | for fd in fdmap: |
246 | 9c233417 | Iustin Pop | status = fcntl.fcntl(fd, fcntl.F_GETFL) |
247 | 9c233417 | Iustin Pop | fcntl.fcntl(fd, fcntl.F_SETFL, status | os.O_NONBLOCK) |
248 | 9c233417 | Iustin Pop | |
249 | 9c233417 | Iustin Pop | while fdmap:
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250 | 9c233417 | Iustin Pop | for fd, event in poller.poll(): |
251 | 9c233417 | Iustin Pop | if event & select.POLLIN or event & select.POLLPRI: |
252 | 9c233417 | Iustin Pop | data = fdmap[fd][1].read()
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253 | 9c233417 | Iustin Pop | # no data from read signifies EOF (the same as POLLHUP)
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254 | 9c233417 | Iustin Pop | if not data: |
255 | 9c233417 | Iustin Pop | poller.unregister(fd) |
256 | 9c233417 | Iustin Pop | del fdmap[fd]
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257 | 9c233417 | Iustin Pop | continue
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258 | 9c233417 | Iustin Pop | fdmap[fd][0].write(data)
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259 | 9c233417 | Iustin Pop | if (event & select.POLLNVAL or event & select.POLLHUP or |
260 | 9c233417 | Iustin Pop | event & select.POLLERR): |
261 | 9c233417 | Iustin Pop | poller.unregister(fd) |
262 | 9c233417 | Iustin Pop | del fdmap[fd]
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263 | 9c233417 | Iustin Pop | |
264 | 9c233417 | Iustin Pop | out = out.getvalue() |
265 | 9c233417 | Iustin Pop | err = err.getvalue() |
266 | a8083063 | Iustin Pop | |
267 | a8083063 | Iustin Pop | status = child.wait() |
268 | 113b55aa | Iustin Pop | if status >= 0: |
269 | 113b55aa | Iustin Pop | exitcode = status |
270 | a8083063 | Iustin Pop | signal = None
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271 | a8083063 | Iustin Pop | else:
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272 | a8083063 | Iustin Pop | exitcode = None
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273 | 113b55aa | Iustin Pop | signal = -status |
274 | a8083063 | Iustin Pop | |
275 | a8083063 | Iustin Pop | return RunResult(exitcode, signal, out, err, strcmd)
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276 | a8083063 | Iustin Pop | |
277 | a8083063 | Iustin Pop | |
278 | a8083063 | Iustin Pop | def RunCmdUnlocked(cmd): |
279 | a8083063 | Iustin Pop | """Execute a shell command without the 'cmd' lock.
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280 | a8083063 | Iustin Pop |
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281 | a8083063 | Iustin Pop | This variant of `RunCmd()` drops the 'cmd' lock before running the
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282 | a8083063 | Iustin Pop | command and re-aquires it afterwards, thus it can be used to call
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283 | a8083063 | Iustin Pop | other ganeti commands.
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284 | a8083063 | Iustin Pop |
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285 | a8083063 | Iustin Pop | The argument and return values are the same as for the `RunCmd()`
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286 | a8083063 | Iustin Pop | function.
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287 | a8083063 | Iustin Pop |
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288 | a8083063 | Iustin Pop | Args:
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289 | a8083063 | Iustin Pop | cmd - command to run. (str)
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290 | a8083063 | Iustin Pop |
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291 | a8083063 | Iustin Pop | Returns:
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292 | a8083063 | Iustin Pop | `RunResult`
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293 | a8083063 | Iustin Pop |
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294 | a8083063 | Iustin Pop | """
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295 | a8083063 | Iustin Pop | Unlock('cmd')
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296 | a8083063 | Iustin Pop | ret = RunCmd(cmd) |
297 | a8083063 | Iustin Pop | Lock('cmd')
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298 | a8083063 | Iustin Pop | |
299 | a8083063 | Iustin Pop | return ret
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300 | a8083063 | Iustin Pop | |
301 | a8083063 | Iustin Pop | |
302 | a8083063 | Iustin Pop | def RemoveFile(filename): |
303 | a8083063 | Iustin Pop | """Remove a file ignoring some errors.
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304 | a8083063 | Iustin Pop |
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305 | a8083063 | Iustin Pop | Remove a file, ignoring non-existing ones or directories. Other
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306 | a8083063 | Iustin Pop | errors are passed.
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307 | a8083063 | Iustin Pop |
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308 | a8083063 | Iustin Pop | """
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309 | a8083063 | Iustin Pop | try:
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310 | a8083063 | Iustin Pop | os.unlink(filename) |
311 | a8083063 | Iustin Pop | except OSError, err: |
312 | 4ca1b175 | Alexander Schreiber | if err.errno not in (errno.ENOENT, errno.EISDIR): |
313 | a8083063 | Iustin Pop | raise
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314 | a8083063 | Iustin Pop | |
315 | a8083063 | Iustin Pop | |
316 | a8083063 | Iustin Pop | def _FingerprintFile(filename): |
317 | a8083063 | Iustin Pop | """Compute the fingerprint of a file.
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318 | a8083063 | Iustin Pop |
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319 | a8083063 | Iustin Pop | If the file does not exist, a None will be returned
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320 | a8083063 | Iustin Pop | instead.
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321 | a8083063 | Iustin Pop |
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322 | a8083063 | Iustin Pop | Args:
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323 | a8083063 | Iustin Pop | filename - Filename (str)
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324 | a8083063 | Iustin Pop |
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325 | a8083063 | Iustin Pop | """
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326 | a8083063 | Iustin Pop | if not (os.path.exists(filename) and os.path.isfile(filename)): |
327 | a8083063 | Iustin Pop | return None |
328 | a8083063 | Iustin Pop | |
329 | a8083063 | Iustin Pop | f = open(filename)
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330 | a8083063 | Iustin Pop | |
331 | a8083063 | Iustin Pop | fp = sha.sha() |
332 | a8083063 | Iustin Pop | while True: |
333 | a8083063 | Iustin Pop | data = f.read(4096)
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334 | a8083063 | Iustin Pop | if not data: |
335 | a8083063 | Iustin Pop | break
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336 | a8083063 | Iustin Pop | |
337 | a8083063 | Iustin Pop | fp.update(data) |
338 | a8083063 | Iustin Pop | |
339 | a8083063 | Iustin Pop | return fp.hexdigest()
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340 | a8083063 | Iustin Pop | |
341 | a8083063 | Iustin Pop | |
342 | a8083063 | Iustin Pop | def FingerprintFiles(files): |
343 | a8083063 | Iustin Pop | """Compute fingerprints for a list of files.
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344 | a8083063 | Iustin Pop |
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345 | a8083063 | Iustin Pop | Args:
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346 | a8083063 | Iustin Pop | files - array of filenames. ( [str, ...] )
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347 | a8083063 | Iustin Pop |
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348 | a8083063 | Iustin Pop | Return value:
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349 | a8083063 | Iustin Pop | dictionary of filename: fingerprint for the files that exist
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350 | a8083063 | Iustin Pop |
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351 | a8083063 | Iustin Pop | """
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352 | a8083063 | Iustin Pop | ret = {} |
353 | a8083063 | Iustin Pop | |
354 | a8083063 | Iustin Pop | for filename in files: |
355 | a8083063 | Iustin Pop | cksum = _FingerprintFile(filename) |
356 | a8083063 | Iustin Pop | if cksum:
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357 | a8083063 | Iustin Pop | ret[filename] = cksum |
358 | a8083063 | Iustin Pop | |
359 | a8083063 | Iustin Pop | return ret
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360 | a8083063 | Iustin Pop | |
361 | a8083063 | Iustin Pop | |
362 | a8083063 | Iustin Pop | def CheckDict(target, template, logname=None): |
363 | a8083063 | Iustin Pop | """Ensure a dictionary has a required set of keys.
|
364 | a8083063 | Iustin Pop |
|
365 | a8083063 | Iustin Pop | For the given dictionaries `target` and `template`, ensure target
|
366 | a8083063 | Iustin Pop | has all the keys from template. Missing keys are added with values
|
367 | a8083063 | Iustin Pop | from template.
|
368 | a8083063 | Iustin Pop |
|
369 | a8083063 | Iustin Pop | Args:
|
370 | a8083063 | Iustin Pop | target - the dictionary to check
|
371 | a8083063 | Iustin Pop | template - template dictionary
|
372 | a8083063 | Iustin Pop | logname - a caller-chosen string to identify the debug log
|
373 | a8083063 | Iustin Pop | entry; if None, no logging will be done
|
374 | a8083063 | Iustin Pop |
|
375 | a8083063 | Iustin Pop | Returns value:
|
376 | a8083063 | Iustin Pop | None
|
377 | a8083063 | Iustin Pop |
|
378 | a8083063 | Iustin Pop | """
|
379 | a8083063 | Iustin Pop | missing = [] |
380 | a8083063 | Iustin Pop | for k in template: |
381 | a8083063 | Iustin Pop | if k not in target: |
382 | a8083063 | Iustin Pop | missing.append(k) |
383 | a8083063 | Iustin Pop | target[k] = template[k] |
384 | a8083063 | Iustin Pop | |
385 | a8083063 | Iustin Pop | if missing and logname: |
386 | a8083063 | Iustin Pop | logger.Debug('%s missing keys %s' %
|
387 | a8083063 | Iustin Pop | (logname, ', '.join(missing)))
|
388 | a8083063 | Iustin Pop | |
389 | a8083063 | Iustin Pop | |
390 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
391 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
|
392 | a8083063 | Iustin Pop |
|
393 | a8083063 | Iustin Pop | Returns: true or false, depending on if the pid exists or not
|
394 | a8083063 | Iustin Pop |
|
395 | a8083063 | Iustin Pop | Remarks: zombie processes treated as not alive
|
396 | a8083063 | Iustin Pop |
|
397 | a8083063 | Iustin Pop | """
|
398 | a8083063 | Iustin Pop | try:
|
399 | a8083063 | Iustin Pop | f = open("/proc/%d/status" % pid) |
400 | a8083063 | Iustin Pop | except IOError, err: |
401 | 4ca1b175 | Alexander Schreiber | if err.errno in (errno.ENOENT, errno.ENOTDIR): |
402 | a8083063 | Iustin Pop | return False |
403 | a8083063 | Iustin Pop | |
404 | a8083063 | Iustin Pop | alive = True
|
405 | a8083063 | Iustin Pop | try:
|
406 | a8083063 | Iustin Pop | data = f.readlines() |
407 | a8083063 | Iustin Pop | if len(data) > 1: |
408 | a8083063 | Iustin Pop | state = data[1].split()
|
409 | a8083063 | Iustin Pop | if len(state) > 1 and state[1] == "Z": |
410 | a8083063 | Iustin Pop | alive = False
|
411 | a8083063 | Iustin Pop | finally:
|
412 | a8083063 | Iustin Pop | f.close() |
413 | a8083063 | Iustin Pop | |
414 | a8083063 | Iustin Pop | return alive
|
415 | a8083063 | Iustin Pop | |
416 | a8083063 | Iustin Pop | |
417 | a8083063 | Iustin Pop | def MatchNameComponent(key, name_list): |
418 | a8083063 | Iustin Pop | """Try to match a name against a list.
|
419 | a8083063 | Iustin Pop |
|
420 | a8083063 | Iustin Pop | This function will try to match a name like test1 against a list
|
421 | a8083063 | Iustin Pop | like ['test1.example.com', 'test2.example.com', ...]. Against this
|
422 | a8083063 | Iustin Pop | list, 'test1' as well as 'test1.example' will match, but not
|
423 | a8083063 | Iustin Pop | 'test1.ex'. A multiple match will be considered as no match at all
|
424 | a8083063 | Iustin Pop | (e.g. 'test1' against ['test1.example.com', 'test1.example.org']).
|
425 | a8083063 | Iustin Pop |
|
426 | a8083063 | Iustin Pop | Args:
|
427 | a8083063 | Iustin Pop | key: the name to be searched
|
428 | a8083063 | Iustin Pop | name_list: the list of strings against which to search the key
|
429 | a8083063 | Iustin Pop |
|
430 | a8083063 | Iustin Pop | Returns:
|
431 | a8083063 | Iustin Pop | None if there is no match *or* if there are multiple matches
|
432 | a8083063 | Iustin Pop | otherwise the element from the list which matches
|
433 | a8083063 | Iustin Pop |
|
434 | a8083063 | Iustin Pop | """
|
435 | a8083063 | Iustin Pop | mo = re.compile("^%s(\..*)?$" % re.escape(key))
|
436 | a8083063 | Iustin Pop | names_filtered = [name for name in name_list if mo.match(name) is not None] |
437 | a8083063 | Iustin Pop | if len(names_filtered) != 1: |
438 | a8083063 | Iustin Pop | return None |
439 | a8083063 | Iustin Pop | return names_filtered[0] |
440 | a8083063 | Iustin Pop | |
441 | a8083063 | Iustin Pop | |
442 | bcf043c9 | Iustin Pop | class HostInfo: |
443 | 89e1fc26 | Iustin Pop | """Class implementing resolver and hostname functionality
|
444 | bcf043c9 | Iustin Pop |
|
445 | bcf043c9 | Iustin Pop | """
|
446 | 89e1fc26 | Iustin Pop | def __init__(self, name=None): |
447 | bcf043c9 | Iustin Pop | """Initialize the host name object.
|
448 | bcf043c9 | Iustin Pop |
|
449 | 89e1fc26 | Iustin Pop | If the name argument is not passed, it will use this system's
|
450 | 89e1fc26 | Iustin Pop | name.
|
451 | bcf043c9 | Iustin Pop |
|
452 | bcf043c9 | Iustin Pop | """
|
453 | 89e1fc26 | Iustin Pop | if name is None: |
454 | 89e1fc26 | Iustin Pop | name = self.SysName()
|
455 | 89e1fc26 | Iustin Pop | |
456 | 89e1fc26 | Iustin Pop | self.query = name
|
457 | 89e1fc26 | Iustin Pop | self.name, self.aliases, self.ipaddrs = self.LookupHostname(name) |
458 | bcf043c9 | Iustin Pop | self.ip = self.ipaddrs[0] |
459 | bcf043c9 | Iustin Pop | |
460 | c8a0948f | Michael Hanselmann | def ShortName(self): |
461 | c8a0948f | Michael Hanselmann | """Returns the hostname without domain.
|
462 | c8a0948f | Michael Hanselmann |
|
463 | c8a0948f | Michael Hanselmann | """
|
464 | c8a0948f | Michael Hanselmann | return self.name.split('.')[0] |
465 | c8a0948f | Michael Hanselmann | |
466 | 89e1fc26 | Iustin Pop | @staticmethod
|
467 | 89e1fc26 | Iustin Pop | def SysName(): |
468 | 89e1fc26 | Iustin Pop | """Return the current system's name.
|
469 | bcf043c9 | Iustin Pop |
|
470 | 89e1fc26 | Iustin Pop | This is simply a wrapper over socket.gethostname()
|
471 | a8083063 | Iustin Pop |
|
472 | 89e1fc26 | Iustin Pop | """
|
473 | 89e1fc26 | Iustin Pop | return socket.gethostname()
|
474 | a8083063 | Iustin Pop | |
475 | 89e1fc26 | Iustin Pop | @staticmethod
|
476 | 89e1fc26 | Iustin Pop | def LookupHostname(hostname): |
477 | 89e1fc26 | Iustin Pop | """Look up hostname
|
478 | a8083063 | Iustin Pop |
|
479 | 89e1fc26 | Iustin Pop | Args:
|
480 | 89e1fc26 | Iustin Pop | hostname: hostname to look up
|
481 | 89e1fc26 | Iustin Pop |
|
482 | 89e1fc26 | Iustin Pop | Returns:
|
483 | 89e1fc26 | Iustin Pop | a tuple (name, aliases, ipaddrs) as returned by socket.gethostbyname_ex
|
484 | 89e1fc26 | Iustin Pop | in case of errors in resolving, we raise a ResolverError
|
485 | 89e1fc26 | Iustin Pop |
|
486 | 89e1fc26 | Iustin Pop | """
|
487 | 89e1fc26 | Iustin Pop | try:
|
488 | 89e1fc26 | Iustin Pop | result = socket.gethostbyname_ex(hostname) |
489 | 89e1fc26 | Iustin Pop | except socket.gaierror, err:
|
490 | 89e1fc26 | Iustin Pop | # hostname not found in DNS
|
491 | 89e1fc26 | Iustin Pop | raise errors.ResolverError(hostname, err.args[0], err.args[1]) |
492 | a8083063 | Iustin Pop | |
493 | 89e1fc26 | Iustin Pop | return result
|
494 | a8083063 | Iustin Pop | |
495 | a8083063 | Iustin Pop | |
496 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
497 | a8083063 | Iustin Pop | """List volume groups and their size
|
498 | a8083063 | Iustin Pop |
|
499 | a8083063 | Iustin Pop | Returns:
|
500 | a8083063 | Iustin Pop | Dictionary with keys volume name and values the size of the volume
|
501 | a8083063 | Iustin Pop |
|
502 | a8083063 | Iustin Pop | """
|
503 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
504 | a8083063 | Iustin Pop | result = RunCmd(command) |
505 | a8083063 | Iustin Pop | retval = {} |
506 | a8083063 | Iustin Pop | if result.failed:
|
507 | a8083063 | Iustin Pop | return retval
|
508 | a8083063 | Iustin Pop | |
509 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
510 | a8083063 | Iustin Pop | try:
|
511 | a8083063 | Iustin Pop | name, size = line.split() |
512 | a8083063 | Iustin Pop | size = int(float(size)) |
513 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
514 | a8083063 | Iustin Pop | logger.Error("Invalid output from vgs (%s): %s" % (err, line))
|
515 | a8083063 | Iustin Pop | continue
|
516 | a8083063 | Iustin Pop | |
517 | a8083063 | Iustin Pop | retval[name] = size |
518 | a8083063 | Iustin Pop | |
519 | a8083063 | Iustin Pop | return retval
|
520 | a8083063 | Iustin Pop | |
521 | a8083063 | Iustin Pop | |
522 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
523 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
524 | a8083063 | Iustin Pop |
|
525 | a8083063 | Iustin Pop | Returns:
|
526 | a8083063 | Iustin Pop | True if it does, false otherwise.
|
527 | a8083063 | Iustin Pop |
|
528 | a8083063 | Iustin Pop | """
|
529 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
530 | a8083063 | Iustin Pop | |
531 | a8083063 | Iustin Pop | |
532 | a8083063 | Iustin Pop | def NiceSort(name_list): |
533 | a8083063 | Iustin Pop | """Sort a list of strings based on digit and non-digit groupings.
|
534 | a8083063 | Iustin Pop |
|
535 | a8083063 | Iustin Pop | Given a list of names ['a1', 'a10', 'a11', 'a2'] this function will
|
536 | a8083063 | Iustin Pop | sort the list in the logical order ['a1', 'a2', 'a10', 'a11'].
|
537 | a8083063 | Iustin Pop |
|
538 | a8083063 | Iustin Pop | The sort algorithm breaks each name in groups of either only-digits
|
539 | a8083063 | Iustin Pop | or no-digits. Only the first eight such groups are considered, and
|
540 | a8083063 | Iustin Pop | after that we just use what's left of the string.
|
541 | a8083063 | Iustin Pop |
|
542 | a8083063 | Iustin Pop | Return value
|
543 | a8083063 | Iustin Pop | - a copy of the list sorted according to our algorithm
|
544 | a8083063 | Iustin Pop |
|
545 | a8083063 | Iustin Pop | """
|
546 | a8083063 | Iustin Pop | _SORTER_BASE = "(\D+|\d+)"
|
547 | a8083063 | Iustin Pop | _SORTER_FULL = "^%s%s?%s?%s?%s?%s?%s?%s?.*$" % (_SORTER_BASE, _SORTER_BASE,
|
548 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
549 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
550 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE) |
551 | a8083063 | Iustin Pop | _SORTER_RE = re.compile(_SORTER_FULL) |
552 | a8083063 | Iustin Pop | _SORTER_NODIGIT = re.compile("^\D*$")
|
553 | a8083063 | Iustin Pop | def _TryInt(val): |
554 | a8083063 | Iustin Pop | """Attempts to convert a variable to integer."""
|
555 | a8083063 | Iustin Pop | if val is None or _SORTER_NODIGIT.match(val): |
556 | a8083063 | Iustin Pop | return val
|
557 | a8083063 | Iustin Pop | rval = int(val)
|
558 | a8083063 | Iustin Pop | return rval
|
559 | a8083063 | Iustin Pop | |
560 | a8083063 | Iustin Pop | to_sort = [([_TryInt(grp) for grp in _SORTER_RE.match(name).groups()], name) |
561 | a8083063 | Iustin Pop | for name in name_list] |
562 | a8083063 | Iustin Pop | to_sort.sort() |
563 | a8083063 | Iustin Pop | return [tup[1] for tup in to_sort] |
564 | a8083063 | Iustin Pop | |
565 | a8083063 | Iustin Pop | |
566 | a8083063 | Iustin Pop | def CheckDaemonAlive(pid_file, process_string): |
567 | a8083063 | Iustin Pop | """Check wether the specified daemon is alive.
|
568 | a8083063 | Iustin Pop |
|
569 | a8083063 | Iustin Pop | Args:
|
570 | a8083063 | Iustin Pop | - pid_file: file to read the daemon pid from, the file is
|
571 | a8083063 | Iustin Pop | expected to contain only a single line containing
|
572 | a8083063 | Iustin Pop | only the PID
|
573 | a8083063 | Iustin Pop | - process_string: a substring that we expect to find in
|
574 | a8083063 | Iustin Pop | the command line of the daemon process
|
575 | a8083063 | Iustin Pop |
|
576 | a8083063 | Iustin Pop | Returns:
|
577 | a8083063 | Iustin Pop | - True if the daemon is judged to be alive (that is:
|
578 | a8083063 | Iustin Pop | - the PID file exists, is readable and contains a number
|
579 | a8083063 | Iustin Pop | - a process of the specified PID is running
|
580 | a8083063 | Iustin Pop | - that process contains the specified string in its
|
581 | a8083063 | Iustin Pop | command line
|
582 | a8083063 | Iustin Pop | - the process is not in state Z (zombie))
|
583 | a8083063 | Iustin Pop | - False otherwise
|
584 | a8083063 | Iustin Pop |
|
585 | a8083063 | Iustin Pop | """
|
586 | a8083063 | Iustin Pop | try:
|
587 | a8083063 | Iustin Pop | pid_file = file(pid_file, 'r') |
588 | a8083063 | Iustin Pop | try:
|
589 | a8083063 | Iustin Pop | pid = int(pid_file.readline())
|
590 | a8083063 | Iustin Pop | finally:
|
591 | a8083063 | Iustin Pop | pid_file.close() |
592 | a8083063 | Iustin Pop | |
593 | a8083063 | Iustin Pop | cmdline_file_path = "/proc/%s/cmdline" % (pid)
|
594 | a8083063 | Iustin Pop | cmdline_file = open(cmdline_file_path, 'r') |
595 | a8083063 | Iustin Pop | try:
|
596 | a8083063 | Iustin Pop | cmdline = cmdline_file.readline() |
597 | a8083063 | Iustin Pop | finally:
|
598 | a8083063 | Iustin Pop | cmdline_file.close() |
599 | a8083063 | Iustin Pop | |
600 | a8083063 | Iustin Pop | if not process_string in cmdline: |
601 | a8083063 | Iustin Pop | return False |
602 | a8083063 | Iustin Pop | |
603 | a8083063 | Iustin Pop | stat_file_path = "/proc/%s/stat" % (pid)
|
604 | a8083063 | Iustin Pop | stat_file = open(stat_file_path, 'r') |
605 | a8083063 | Iustin Pop | try:
|
606 | a8083063 | Iustin Pop | process_state = stat_file.readline().split()[2]
|
607 | a8083063 | Iustin Pop | finally:
|
608 | a8083063 | Iustin Pop | stat_file.close() |
609 | a8083063 | Iustin Pop | |
610 | a8083063 | Iustin Pop | if process_state == 'Z': |
611 | a8083063 | Iustin Pop | return False |
612 | a8083063 | Iustin Pop | |
613 | a8083063 | Iustin Pop | except (IndexError, IOError, ValueError): |
614 | a8083063 | Iustin Pop | return False |
615 | a8083063 | Iustin Pop | |
616 | a8083063 | Iustin Pop | return True |
617 | a8083063 | Iustin Pop | |
618 | a8083063 | Iustin Pop | |
619 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
620 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
621 | a8083063 | Iustin Pop |
|
622 | a8083063 | Iustin Pop | This function tries to apply function `fn` to `val`. If no
|
623 | a8083063 | Iustin Pop | ValueError or TypeError exceptions are raised, it will return the
|
624 | a8083063 | Iustin Pop | result, else it will return the original value. Any other exceptions
|
625 | a8083063 | Iustin Pop | are propagated to the caller.
|
626 | a8083063 | Iustin Pop |
|
627 | a8083063 | Iustin Pop | """
|
628 | a8083063 | Iustin Pop | try:
|
629 | a8083063 | Iustin Pop | nv = fn(val) |
630 | a8083063 | Iustin Pop | except (ValueError, TypeError), err: |
631 | a8083063 | Iustin Pop | nv = val |
632 | a8083063 | Iustin Pop | return nv
|
633 | a8083063 | Iustin Pop | |
634 | a8083063 | Iustin Pop | |
635 | a8083063 | Iustin Pop | def IsValidIP(ip): |
636 | a8083063 | Iustin Pop | """Verifies the syntax of an IP address.
|
637 | a8083063 | Iustin Pop |
|
638 | a8083063 | Iustin Pop | This function checks if the ip address passes is valid or not based
|
639 | a8083063 | Iustin Pop | on syntax (not ip range, class calculations or anything).
|
640 | a8083063 | Iustin Pop |
|
641 | a8083063 | Iustin Pop | """
|
642 | a8083063 | Iustin Pop | unit = "(0|[1-9]\d{0,2})"
|
643 | a8083063 | Iustin Pop | return re.match("^%s\.%s\.%s\.%s$" % (unit, unit, unit, unit), ip) |
644 | a8083063 | Iustin Pop | |
645 | a8083063 | Iustin Pop | |
646 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
647 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
648 | a8083063 | Iustin Pop |
|
649 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
650 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
651 | a8083063 | Iustin Pop | the actual command.
|
652 | a8083063 | Iustin Pop |
|
653 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
654 | a8083063 | Iustin Pop | side.
|
655 | a8083063 | Iustin Pop |
|
656 | a8083063 | Iustin Pop | """
|
657 | a8083063 | Iustin Pop | return bool(re.match("^[-a-zA-Z0-9._+/:%@]+$", word)) |
658 | a8083063 | Iustin Pop | |
659 | a8083063 | Iustin Pop | |
660 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
661 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
662 | a8083063 | Iustin Pop |
|
663 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
664 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
665 | a8083063 | Iustin Pop | metacharaters). If everything is ok, it will return the result of
|
666 | a8083063 | Iustin Pop | template % args.
|
667 | a8083063 | Iustin Pop |
|
668 | a8083063 | Iustin Pop | """
|
669 | a8083063 | Iustin Pop | for word in args: |
670 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
671 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
672 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
673 | a8083063 | Iustin Pop | return template % args
|
674 | a8083063 | Iustin Pop | |
675 | a8083063 | Iustin Pop | |
676 | a8083063 | Iustin Pop | def FormatUnit(value): |
677 | a8083063 | Iustin Pop | """Formats an incoming number of MiB with the appropriate unit.
|
678 | a8083063 | Iustin Pop |
|
679 | a8083063 | Iustin Pop | Value needs to be passed as a numeric type. Return value is always a string.
|
680 | a8083063 | Iustin Pop |
|
681 | a8083063 | Iustin Pop | """
|
682 | a8083063 | Iustin Pop | if value < 1024: |
683 | a8083063 | Iustin Pop | return "%dM" % round(value, 0) |
684 | a8083063 | Iustin Pop | |
685 | a8083063 | Iustin Pop | elif value < (1024 * 1024): |
686 | a8083063 | Iustin Pop | return "%0.1fG" % round(float(value) / 1024, 1) |
687 | a8083063 | Iustin Pop | |
688 | a8083063 | Iustin Pop | else:
|
689 | a8083063 | Iustin Pop | return "%0.1fT" % round(float(value) / 1024 / 1024, 1) |
690 | a8083063 | Iustin Pop | |
691 | a8083063 | Iustin Pop | |
692 | a8083063 | Iustin Pop | def ParseUnit(input_string): |
693 | a8083063 | Iustin Pop | """Tries to extract number and scale from the given string.
|
694 | a8083063 | Iustin Pop |
|
695 | a8083063 | Iustin Pop | Input must be in the format NUMBER+ [DOT NUMBER+] SPACE* [UNIT]. If no unit
|
696 | a8083063 | Iustin Pop | is specified, it defaults to MiB. Return value is always an int in MiB.
|
697 | a8083063 | Iustin Pop |
|
698 | a8083063 | Iustin Pop | """
|
699 | a8083063 | Iustin Pop | m = re.match('^([.\d]+)\s*([a-zA-Z]+)?$', input_string)
|
700 | a8083063 | Iustin Pop | if not m: |
701 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Invalid format") |
702 | a8083063 | Iustin Pop | |
703 | a8083063 | Iustin Pop | value = float(m.groups()[0]) |
704 | a8083063 | Iustin Pop | |
705 | a8083063 | Iustin Pop | unit = m.groups()[1]
|
706 | a8083063 | Iustin Pop | if unit:
|
707 | a8083063 | Iustin Pop | lcunit = unit.lower() |
708 | a8083063 | Iustin Pop | else:
|
709 | a8083063 | Iustin Pop | lcunit = 'm'
|
710 | a8083063 | Iustin Pop | |
711 | a8083063 | Iustin Pop | if lcunit in ('m', 'mb', 'mib'): |
712 | a8083063 | Iustin Pop | # Value already in MiB
|
713 | a8083063 | Iustin Pop | pass
|
714 | a8083063 | Iustin Pop | |
715 | a8083063 | Iustin Pop | elif lcunit in ('g', 'gb', 'gib'): |
716 | a8083063 | Iustin Pop | value *= 1024
|
717 | a8083063 | Iustin Pop | |
718 | a8083063 | Iustin Pop | elif lcunit in ('t', 'tb', 'tib'): |
719 | a8083063 | Iustin Pop | value *= 1024 * 1024 |
720 | a8083063 | Iustin Pop | |
721 | a8083063 | Iustin Pop | else:
|
722 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Unknown unit: %s" % unit) |
723 | a8083063 | Iustin Pop | |
724 | a8083063 | Iustin Pop | # Make sure we round up
|
725 | a8083063 | Iustin Pop | if int(value) < value: |
726 | a8083063 | Iustin Pop | value += 1
|
727 | a8083063 | Iustin Pop | |
728 | a8083063 | Iustin Pop | # Round up to the next multiple of 4
|
729 | a8083063 | Iustin Pop | value = int(value)
|
730 | a8083063 | Iustin Pop | if value % 4: |
731 | a8083063 | Iustin Pop | value += 4 - value % 4 |
732 | a8083063 | Iustin Pop | |
733 | a8083063 | Iustin Pop | return value
|
734 | a8083063 | Iustin Pop | |
735 | a8083063 | Iustin Pop | |
736 | a8083063 | Iustin Pop | def AddAuthorizedKey(file_name, key): |
737 | a8083063 | Iustin Pop | """Adds an SSH public key to an authorized_keys file.
|
738 | a8083063 | Iustin Pop |
|
739 | a8083063 | Iustin Pop | Args:
|
740 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
741 | a8083063 | Iustin Pop | key: String containing key
|
742 | a8083063 | Iustin Pop | """
|
743 | a8083063 | Iustin Pop | key_fields = key.split() |
744 | a8083063 | Iustin Pop | |
745 | a8083063 | Iustin Pop | f = open(file_name, 'a+') |
746 | a8083063 | Iustin Pop | try:
|
747 | a8083063 | Iustin Pop | nl = True
|
748 | a8083063 | Iustin Pop | for line in f: |
749 | a8083063 | Iustin Pop | # Ignore whitespace changes
|
750 | a8083063 | Iustin Pop | if line.split() == key_fields:
|
751 | a8083063 | Iustin Pop | break
|
752 | a8083063 | Iustin Pop | nl = line.endswith('\n')
|
753 | a8083063 | Iustin Pop | else:
|
754 | a8083063 | Iustin Pop | if not nl: |
755 | a8083063 | Iustin Pop | f.write("\n")
|
756 | a8083063 | Iustin Pop | f.write(key.rstrip('\r\n'))
|
757 | a8083063 | Iustin Pop | f.write("\n")
|
758 | a8083063 | Iustin Pop | f.flush() |
759 | a8083063 | Iustin Pop | finally:
|
760 | a8083063 | Iustin Pop | f.close() |
761 | a8083063 | Iustin Pop | |
762 | a8083063 | Iustin Pop | |
763 | a8083063 | Iustin Pop | def RemoveAuthorizedKey(file_name, key): |
764 | a8083063 | Iustin Pop | """Removes an SSH public key from an authorized_keys file.
|
765 | a8083063 | Iustin Pop |
|
766 | a8083063 | Iustin Pop | Args:
|
767 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
768 | a8083063 | Iustin Pop | key: String containing key
|
769 | a8083063 | Iustin Pop | """
|
770 | a8083063 | Iustin Pop | key_fields = key.split() |
771 | a8083063 | Iustin Pop | |
772 | a8083063 | Iustin Pop | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
773 | a8083063 | Iustin Pop | try:
|
774 | 59f82e3f | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
775 | a8083063 | Iustin Pop | try:
|
776 | 59f82e3f | Michael Hanselmann | f = open(file_name, 'r') |
777 | 59f82e3f | Michael Hanselmann | try:
|
778 | 59f82e3f | Michael Hanselmann | for line in f: |
779 | 59f82e3f | Michael Hanselmann | # Ignore whitespace changes while comparing lines
|
780 | 59f82e3f | Michael Hanselmann | if line.split() != key_fields:
|
781 | 59f82e3f | Michael Hanselmann | out.write(line) |
782 | 899d2a81 | Michael Hanselmann | |
783 | 899d2a81 | Michael Hanselmann | out.flush() |
784 | 899d2a81 | Michael Hanselmann | os.rename(tmpname, file_name) |
785 | 899d2a81 | Michael Hanselmann | finally:
|
786 | 899d2a81 | Michael Hanselmann | f.close() |
787 | 899d2a81 | Michael Hanselmann | finally:
|
788 | 899d2a81 | Michael Hanselmann | out.close() |
789 | 899d2a81 | Michael Hanselmann | except:
|
790 | 899d2a81 | Michael Hanselmann | RemoveFile(tmpname) |
791 | 899d2a81 | Michael Hanselmann | raise
|
792 | 899d2a81 | Michael Hanselmann | |
793 | 899d2a81 | Michael Hanselmann | |
794 | 9440aeab | Michael Hanselmann | def SetEtcHostsEntry(file_name, ip, hostname, aliases): |
795 | 9440aeab | Michael Hanselmann | """Sets the name of an IP address and hostname in /etc/hosts.
|
796 | 899d2a81 | Michael Hanselmann |
|
797 | 899d2a81 | Michael Hanselmann | """
|
798 | 7fbb1f65 | Michael Hanselmann | # Ensure aliases are unique
|
799 | 7fbb1f65 | Michael Hanselmann | aliases = UniqueSequence([hostname] + aliases)[1:]
|
800 | 7fbb1f65 | Michael Hanselmann | |
801 | 9440aeab | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
802 | 899d2a81 | Michael Hanselmann | try:
|
803 | 9440aeab | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
804 | 9440aeab | Michael Hanselmann | try:
|
805 | 9440aeab | Michael Hanselmann | f = open(file_name, 'r') |
806 | 9440aeab | Michael Hanselmann | try:
|
807 | 9440aeab | Michael Hanselmann | written = False
|
808 | 9440aeab | Michael Hanselmann | for line in f: |
809 | 9440aeab | Michael Hanselmann | fields = line.split() |
810 | 7e3dbb94 | Iustin Pop | if fields and not fields[0].startswith('#') and ip == fields[0]: |
811 | 9440aeab | Michael Hanselmann | continue
|
812 | 9440aeab | Michael Hanselmann | out.write(line) |
813 | 9440aeab | Michael Hanselmann | |
814 | 7e3dbb94 | Iustin Pop | out.write("%s\t%s" % (ip, hostname))
|
815 | 9440aeab | Michael Hanselmann | if aliases:
|
816 | 9440aeab | Michael Hanselmann | out.write(" %s" % ' '.join(aliases)) |
817 | 9440aeab | Michael Hanselmann | out.write('\n')
|
818 | 9440aeab | Michael Hanselmann | |
819 | 9440aeab | Michael Hanselmann | out.flush() |
820 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
821 | 9440aeab | Michael Hanselmann | os.rename(tmpname, file_name) |
822 | 9440aeab | Michael Hanselmann | finally:
|
823 | 9440aeab | Michael Hanselmann | f.close() |
824 | 9440aeab | Michael Hanselmann | finally:
|
825 | 9440aeab | Michael Hanselmann | out.close() |
826 | 9440aeab | Michael Hanselmann | except:
|
827 | 9440aeab | Michael Hanselmann | RemoveFile(tmpname) |
828 | 9440aeab | Michael Hanselmann | raise
|
829 | 899d2a81 | Michael Hanselmann | |
830 | 899d2a81 | Michael Hanselmann | |
831 | 899d2a81 | Michael Hanselmann | def RemoveEtcHostsEntry(file_name, hostname): |
832 | 3e1cdf9f | Michael Hanselmann | """Removes a hostname from /etc/hosts.
|
833 | 899d2a81 | Michael Hanselmann |
|
834 | 9440aeab | Michael Hanselmann | IP addresses without names are removed from the file.
|
835 | 899d2a81 | Michael Hanselmann | """
|
836 | 899d2a81 | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
837 | 899d2a81 | Michael Hanselmann | try:
|
838 | 899d2a81 | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
839 | 899d2a81 | Michael Hanselmann | try:
|
840 | 899d2a81 | Michael Hanselmann | f = open(file_name, 'r') |
841 | 899d2a81 | Michael Hanselmann | try:
|
842 | 899d2a81 | Michael Hanselmann | for line in f: |
843 | 899d2a81 | Michael Hanselmann | fields = line.split() |
844 | 899d2a81 | Michael Hanselmann | if len(fields) > 1 and not fields[0].startswith('#'): |
845 | 899d2a81 | Michael Hanselmann | names = fields[1:]
|
846 | 899d2a81 | Michael Hanselmann | if hostname in names: |
847 | 899d2a81 | Michael Hanselmann | while hostname in names: |
848 | 899d2a81 | Michael Hanselmann | names.remove(hostname) |
849 | 899d2a81 | Michael Hanselmann | if names:
|
850 | 9440aeab | Michael Hanselmann | out.write("%s %s\n" % (fields[0], ' '.join(names))) |
851 | 899d2a81 | Michael Hanselmann | continue
|
852 | 899d2a81 | Michael Hanselmann | |
853 | 899d2a81 | Michael Hanselmann | out.write(line) |
854 | 59f82e3f | Michael Hanselmann | |
855 | 59f82e3f | Michael Hanselmann | out.flush() |
856 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
857 | 59f82e3f | Michael Hanselmann | os.rename(tmpname, file_name) |
858 | 59f82e3f | Michael Hanselmann | finally:
|
859 | 59f82e3f | Michael Hanselmann | f.close() |
860 | a8083063 | Iustin Pop | finally:
|
861 | 59f82e3f | Michael Hanselmann | out.close() |
862 | 59f82e3f | Michael Hanselmann | except:
|
863 | 59f82e3f | Michael Hanselmann | RemoveFile(tmpname) |
864 | 59f82e3f | Michael Hanselmann | raise
|
865 | a8083063 | Iustin Pop | |
866 | a8083063 | Iustin Pop | |
867 | a8083063 | Iustin Pop | def CreateBackup(file_name): |
868 | a8083063 | Iustin Pop | """Creates a backup of a file.
|
869 | a8083063 | Iustin Pop |
|
870 | a8083063 | Iustin Pop | Returns: the path to the newly created backup file.
|
871 | a8083063 | Iustin Pop |
|
872 | a8083063 | Iustin Pop | """
|
873 | a8083063 | Iustin Pop | if not os.path.isfile(file_name): |
874 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Can't make a backup of a non-file '%s'" % |
875 | 3ecf6786 | Iustin Pop | file_name) |
876 | a8083063 | Iustin Pop | |
877 | 081b1e69 | Michael Hanselmann | prefix = '%s.backup-%d.' % (os.path.basename(file_name), int(time.time())) |
878 | 65fe4693 | Iustin Pop | dir_name = os.path.dirname(file_name) |
879 | 081b1e69 | Michael Hanselmann | |
880 | 081b1e69 | Michael Hanselmann | fsrc = open(file_name, 'rb') |
881 | 081b1e69 | Michael Hanselmann | try:
|
882 | 65fe4693 | Iustin Pop | (fd, backup_name) = tempfile.mkstemp(prefix=prefix, dir=dir_name) |
883 | 081b1e69 | Michael Hanselmann | fdst = os.fdopen(fd, 'wb')
|
884 | 081b1e69 | Michael Hanselmann | try:
|
885 | 081b1e69 | Michael Hanselmann | shutil.copyfileobj(fsrc, fdst) |
886 | 081b1e69 | Michael Hanselmann | finally:
|
887 | 081b1e69 | Michael Hanselmann | fdst.close() |
888 | 081b1e69 | Michael Hanselmann | finally:
|
889 | 081b1e69 | Michael Hanselmann | fsrc.close() |
890 | 081b1e69 | Michael Hanselmann | |
891 | a8083063 | Iustin Pop | return backup_name
|
892 | a8083063 | Iustin Pop | |
893 | a8083063 | Iustin Pop | |
894 | a8083063 | Iustin Pop | def ShellQuote(value): |
895 | a8083063 | Iustin Pop | """Quotes shell argument according to POSIX.
|
896 | 3ecf6786 | Iustin Pop |
|
897 | a8083063 | Iustin Pop | """
|
898 | a8083063 | Iustin Pop | if _re_shell_unquoted.match(value):
|
899 | a8083063 | Iustin Pop | return value
|
900 | a8083063 | Iustin Pop | else:
|
901 | a8083063 | Iustin Pop | return "'%s'" % value.replace("'", "'\\''") |
902 | a8083063 | Iustin Pop | |
903 | a8083063 | Iustin Pop | |
904 | a8083063 | Iustin Pop | def ShellQuoteArgs(args): |
905 | a8083063 | Iustin Pop | """Quotes all given shell arguments and concatenates using spaces.
|
906 | a8083063 | Iustin Pop |
|
907 | a8083063 | Iustin Pop | """
|
908 | a8083063 | Iustin Pop | return ' '.join([ShellQuote(i) for i in args]) |
909 | 88d14415 | Michael Hanselmann | |
910 | 88d14415 | Michael Hanselmann | |
911 | 2c30e9d7 | Alexander Schreiber | |
912 | 16abfbc2 | Alexander Schreiber | def TcpPing(source, target, port, timeout=10, live_port_needed=False): |
913 | 2c30e9d7 | Alexander Schreiber | """Simple ping implementation using TCP connect(2).
|
914 | 2c30e9d7 | Alexander Schreiber |
|
915 | 2c30e9d7 | Alexander Schreiber | Try to do a TCP connect(2) from the specified source IP to the specified
|
916 | 2c30e9d7 | Alexander Schreiber | target IP and the specified target port. If live_port_needed is set to true,
|
917 | 2c30e9d7 | Alexander Schreiber | requires the remote end to accept the connection. The timeout is specified
|
918 | 2c30e9d7 | Alexander Schreiber | in seconds and defaults to 10 seconds
|
919 | 2c30e9d7 | Alexander Schreiber |
|
920 | 2c30e9d7 | Alexander Schreiber | """
|
921 | 2c30e9d7 | Alexander Schreiber | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
922 | 2c30e9d7 | Alexander Schreiber | |
923 | 2c30e9d7 | Alexander Schreiber | sucess = False
|
924 | 2c30e9d7 | Alexander Schreiber | |
925 | 2c30e9d7 | Alexander Schreiber | try:
|
926 | 2c30e9d7 | Alexander Schreiber | sock.bind((source, 0))
|
927 | 2c30e9d7 | Alexander Schreiber | except socket.error, (errcode, errstring):
|
928 | 4ca1b175 | Alexander Schreiber | if errcode == errno.EADDRNOTAVAIL:
|
929 | 2c30e9d7 | Alexander Schreiber | success = False
|
930 | 2c30e9d7 | Alexander Schreiber | |
931 | 2c30e9d7 | Alexander Schreiber | sock.settimeout(timeout) |
932 | 2c30e9d7 | Alexander Schreiber | |
933 | 2c30e9d7 | Alexander Schreiber | try:
|
934 | 2c30e9d7 | Alexander Schreiber | sock.connect((target, port)) |
935 | 2c30e9d7 | Alexander Schreiber | sock.close() |
936 | 2c30e9d7 | Alexander Schreiber | success = True
|
937 | 2c30e9d7 | Alexander Schreiber | except socket.timeout:
|
938 | 2c30e9d7 | Alexander Schreiber | success = False
|
939 | 2c30e9d7 | Alexander Schreiber | except socket.error, (errcode, errstring):
|
940 | 4ca1b175 | Alexander Schreiber | success = (not live_port_needed) and (errcode == errno.ECONNREFUSED) |
941 | 2c30e9d7 | Alexander Schreiber | |
942 | 2c30e9d7 | Alexander Schreiber | return success
|
943 | eedbda4b | Michael Hanselmann | |
944 | eedbda4b | Michael Hanselmann | |
945 | eedbda4b | Michael Hanselmann | def ListVisibleFiles(path): |
946 | eedbda4b | Michael Hanselmann | """Returns a list of all visible files in a directory.
|
947 | eedbda4b | Michael Hanselmann |
|
948 | eedbda4b | Michael Hanselmann | """
|
949 | f3299a07 | Michael Hanselmann | files = [i for i in os.listdir(path) if not i.startswith(".")] |
950 | f3299a07 | Michael Hanselmann | files.sort() |
951 | f3299a07 | Michael Hanselmann | return files
|
952 | 2f8b60b3 | Iustin Pop | |
953 | 2f8b60b3 | Iustin Pop | |
954 | 257f4c0a | Iustin Pop | def GetHomeDir(user, default=None): |
955 | 257f4c0a | Iustin Pop | """Try to get the homedir of the given user.
|
956 | 257f4c0a | Iustin Pop |
|
957 | 257f4c0a | Iustin Pop | The user can be passed either as a string (denoting the name) or as
|
958 | 257f4c0a | Iustin Pop | an integer (denoting the user id). If the user is not found, the
|
959 | 257f4c0a | Iustin Pop | 'default' argument is returned, which defaults to None.
|
960 | 2f8b60b3 | Iustin Pop |
|
961 | 2f8b60b3 | Iustin Pop | """
|
962 | 2f8b60b3 | Iustin Pop | try:
|
963 | 257f4c0a | Iustin Pop | if isinstance(user, basestring): |
964 | 257f4c0a | Iustin Pop | result = pwd.getpwnam(user) |
965 | 257f4c0a | Iustin Pop | elif isinstance(user, (int, long)): |
966 | 257f4c0a | Iustin Pop | result = pwd.getpwuid(user) |
967 | 257f4c0a | Iustin Pop | else:
|
968 | 257f4c0a | Iustin Pop | raise errors.ProgrammerError("Invalid type passed to GetHomeDir (%s)" % |
969 | 257f4c0a | Iustin Pop | type(user))
|
970 | 2f8b60b3 | Iustin Pop | except KeyError: |
971 | 2f8b60b3 | Iustin Pop | return default
|
972 | 2f8b60b3 | Iustin Pop | return result.pw_dir
|
973 | 59072e7e | Michael Hanselmann | |
974 | 59072e7e | Michael Hanselmann | |
975 | 24818e8f | Michael Hanselmann | def NewUUID(): |
976 | 59072e7e | Michael Hanselmann | """Returns a random UUID.
|
977 | 59072e7e | Michael Hanselmann |
|
978 | 59072e7e | Michael Hanselmann | """
|
979 | 59072e7e | Michael Hanselmann | f = open("/proc/sys/kernel/random/uuid", "r") |
980 | 59072e7e | Michael Hanselmann | try:
|
981 | 59072e7e | Michael Hanselmann | return f.read(128).rstrip("\n") |
982 | 59072e7e | Michael Hanselmann | finally:
|
983 | 59072e7e | Michael Hanselmann | f.close() |
984 | 087b34fe | Iustin Pop | |
985 | 087b34fe | Iustin Pop | |
986 | 087b34fe | Iustin Pop | def WriteFile(file_name, fn=None, data=None, |
987 | 087b34fe | Iustin Pop | mode=None, uid=-1, gid=-1, |
988 | 087b34fe | Iustin Pop | atime=None, mtime=None): |
989 | 087b34fe | Iustin Pop | """(Over)write a file atomically.
|
990 | 087b34fe | Iustin Pop |
|
991 | 087b34fe | Iustin Pop | The file_name and either fn (a function taking one argument, the
|
992 | 087b34fe | Iustin Pop | file descriptor, and which should write the data to it) or data (the
|
993 | 087b34fe | Iustin Pop | contents of the file) must be passed. The other arguments are
|
994 | 087b34fe | Iustin Pop | optional and allow setting the file mode, owner and group, and the
|
995 | 087b34fe | Iustin Pop | mtime/atime of the file.
|
996 | 087b34fe | Iustin Pop |
|
997 | 087b34fe | Iustin Pop | If the function doesn't raise an exception, it has succeeded and the
|
998 | 087b34fe | Iustin Pop | target file has the new contents. If the file has raised an
|
999 | 087b34fe | Iustin Pop | exception, an existing target file should be unmodified and the
|
1000 | 087b34fe | Iustin Pop | temporary file should be removed.
|
1001 | 087b34fe | Iustin Pop |
|
1002 | 087b34fe | Iustin Pop | """
|
1003 | 087b34fe | Iustin Pop | if not os.path.isabs(file_name): |
1004 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Path passed to WriteFile is not" |
1005 | 087b34fe | Iustin Pop | " absolute: '%s'" % file_name)
|
1006 | 087b34fe | Iustin Pop | |
1007 | 087b34fe | Iustin Pop | if [fn, data].count(None) != 1: |
1008 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("fn or data required") |
1009 | 087b34fe | Iustin Pop | |
1010 | 087b34fe | Iustin Pop | if [atime, mtime].count(None) == 1: |
1011 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Both atime and mtime must be either" |
1012 | 087b34fe | Iustin Pop | " set or None")
|
1013 | 087b34fe | Iustin Pop | |
1014 | 087b34fe | Iustin Pop | |
1015 | 087b34fe | Iustin Pop | dir_name, base_name = os.path.split(file_name) |
1016 | 087b34fe | Iustin Pop | fd, new_name = tempfile.mkstemp('.new', base_name, dir_name)
|
1017 | 087b34fe | Iustin Pop | # here we need to make sure we remove the temp file, if any error
|
1018 | 087b34fe | Iustin Pop | # leaves it in place
|
1019 | 087b34fe | Iustin Pop | try:
|
1020 | 087b34fe | Iustin Pop | if uid != -1 or gid != -1: |
1021 | 087b34fe | Iustin Pop | os.chown(new_name, uid, gid) |
1022 | 087b34fe | Iustin Pop | if mode:
|
1023 | 087b34fe | Iustin Pop | os.chmod(new_name, mode) |
1024 | 087b34fe | Iustin Pop | if data is not None: |
1025 | 087b34fe | Iustin Pop | os.write(fd, data) |
1026 | 087b34fe | Iustin Pop | else:
|
1027 | 087b34fe | Iustin Pop | fn(fd) |
1028 | 087b34fe | Iustin Pop | os.fsync(fd) |
1029 | 087b34fe | Iustin Pop | if atime is not None and mtime is not None: |
1030 | 087b34fe | Iustin Pop | os.utime(new_name, (atime, mtime)) |
1031 | 087b34fe | Iustin Pop | os.rename(new_name, file_name) |
1032 | 087b34fe | Iustin Pop | finally:
|
1033 | 087b34fe | Iustin Pop | os.close(fd) |
1034 | 087b34fe | Iustin Pop | RemoveFile(new_name) |
1035 | 78feb6fb | Guido Trotter | |
1036 | 78feb6fb | Guido Trotter | |
1037 | 78feb6fb | Guido Trotter | def all(seq, pred=bool): |
1038 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for every element in the iterable"
|
1039 | 78feb6fb | Guido Trotter | for elem in itertools.ifilterfalse(pred, seq): |
1040 | 78feb6fb | Guido Trotter | return False |
1041 | 78feb6fb | Guido Trotter | return True |
1042 | 78feb6fb | Guido Trotter | |
1043 | 78feb6fb | Guido Trotter | |
1044 | 78feb6fb | Guido Trotter | def any(seq, pred=bool): |
1045 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for at least one element in the iterable"
|
1046 | 78feb6fb | Guido Trotter | for elem in itertools.ifilter(pred, seq): |
1047 | 78feb6fb | Guido Trotter | return True |
1048 | 78feb6fb | Guido Trotter | return False |
1049 | f7414041 | Michael Hanselmann | |
1050 | f7414041 | Michael Hanselmann | |
1051 | f7414041 | Michael Hanselmann | def UniqueSequence(seq): |
1052 | f7414041 | Michael Hanselmann | """Returns a list with unique elements.
|
1053 | f7414041 | Michael Hanselmann |
|
1054 | f7414041 | Michael Hanselmann | Element order is preserved.
|
1055 | f7414041 | Michael Hanselmann | """
|
1056 | f7414041 | Michael Hanselmann | seen = set()
|
1057 | f7414041 | Michael Hanselmann | return [i for i in seq if i not in seen and not seen.add(i)] |
1058 | 1862d460 | Alexander Schreiber | |
1059 | 1862d460 | Alexander Schreiber | |
1060 | 1862d460 | Alexander Schreiber | def IsValidMac(mac): |
1061 | 1862d460 | Alexander Schreiber | """Predicate to check if a MAC address is valid.
|
1062 | 1862d460 | Alexander Schreiber |
|
1063 | 1862d460 | Alexander Schreiber | Checks wether the supplied MAC address is formally correct, only
|
1064 | 1862d460 | Alexander Schreiber | accepts colon separated format.
|
1065 | 1862d460 | Alexander Schreiber | """
|
1066 | 1862d460 | Alexander Schreiber | mac_check = re.compile("^([0-9a-f]{2}(:|$)){6}$")
|
1067 | 1862d460 | Alexander Schreiber | return mac_check.match(mac) is not None |
1068 | 06009e27 | Iustin Pop | |
1069 | 06009e27 | Iustin Pop | |
1070 | 06009e27 | Iustin Pop | def TestDelay(duration): |
1071 | 06009e27 | Iustin Pop | """Sleep for a fixed amount of time.
|
1072 | 06009e27 | Iustin Pop |
|
1073 | 06009e27 | Iustin Pop | """
|
1074 | 06009e27 | Iustin Pop | if duration < 0: |
1075 | 06009e27 | Iustin Pop | return False |
1076 | 06009e27 | Iustin Pop | time.sleep(duration) |
1077 | 06009e27 | Iustin Pop | return True |