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