root / lib / utils.py @ 8bd562f5
History | View | Annotate | Download (18.5 kB)
1 | a8083063 | Iustin Pop | #!/usr/bin/python
|
---|---|---|---|
2 | a8083063 | Iustin Pop | #
|
3 | a8083063 | Iustin Pop | |
4 | a8083063 | Iustin Pop | # Copyright (C) 2006, 2007 Google Inc.
|
5 | a8083063 | Iustin Pop | #
|
6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
|
7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
|
8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
|
9 | a8083063 | Iustin Pop | # (at your option) any later version.
|
10 | a8083063 | Iustin Pop | #
|
11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
|
12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 | a8083063 | Iustin Pop | # General Public License for more details.
|
15 | a8083063 | Iustin Pop | #
|
16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
|
17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
|
18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
19 | a8083063 | Iustin Pop | # 02110-1301, USA.
|
20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Ganeti small utilities
|
23 | a8083063 | Iustin Pop | """
|
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 | a8083063 | Iustin Pop | import popen2 |
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 | a8083063 | Iustin Pop | from errno import ENOENT, ENOTDIR, EISDIR, EEXIST |
36 | a8083063 | Iustin Pop | |
37 | a8083063 | Iustin Pop | from ganeti import logger |
38 | a8083063 | Iustin Pop | from ganeti import errors |
39 | a8083063 | Iustin Pop | |
40 | a8083063 | Iustin Pop | _locksheld = [] |
41 | a8083063 | Iustin Pop | _re_shell_unquoted = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
|
42 | a8083063 | Iustin Pop | |
43 | a8083063 | Iustin Pop | class RunResult(object): |
44 | a8083063 | Iustin Pop | """Simple class for holding the result of running external programs.
|
45 | a8083063 | Iustin Pop |
|
46 | a8083063 | Iustin Pop | Instance variables:
|
47 | a8083063 | Iustin Pop | exit_code: the exit code of the program, or None (if the program
|
48 | a8083063 | Iustin Pop | didn't exit())
|
49 | a8083063 | Iustin Pop | signal: numeric signal that caused the program to finish, or None
|
50 | a8083063 | Iustin Pop | (if the program wasn't terminated by a signal)
|
51 | a8083063 | Iustin Pop | stdout: the standard output of the program
|
52 | a8083063 | Iustin Pop | stderr: the standard error of the program
|
53 | a8083063 | Iustin Pop | failed: a Boolean value which is True in case the program was
|
54 | a8083063 | Iustin Pop | terminated by a signal or exited with a non-zero exit code
|
55 | a8083063 | Iustin Pop | fail_reason: a string detailing the termination reason
|
56 | a8083063 | Iustin Pop |
|
57 | a8083063 | Iustin Pop | """
|
58 | a8083063 | Iustin Pop | __slots__ = ["exit_code", "signal", "stdout", "stderr", |
59 | a8083063 | Iustin Pop | "failed", "fail_reason", "cmd"] |
60 | a8083063 | Iustin Pop | |
61 | a8083063 | Iustin Pop | |
62 | a8083063 | Iustin Pop | def __init__(self, exit_code, signal, stdout, stderr, cmd): |
63 | a8083063 | Iustin Pop | self.cmd = cmd
|
64 | a8083063 | Iustin Pop | self.exit_code = exit_code
|
65 | a8083063 | Iustin Pop | self.signal = signal
|
66 | a8083063 | Iustin Pop | self.stdout = stdout
|
67 | a8083063 | Iustin Pop | self.stderr = stderr
|
68 | a8083063 | Iustin Pop | self.failed = (signal is not None or exit_code != 0) |
69 | a8083063 | Iustin Pop | |
70 | a8083063 | Iustin Pop | if self.signal is not None: |
71 | a8083063 | Iustin Pop | self.fail_reason = "terminated by signal %s" % self.signal |
72 | a8083063 | Iustin Pop | elif self.exit_code is not None: |
73 | a8083063 | Iustin Pop | self.fail_reason = "exited with exit code %s" % self.exit_code |
74 | a8083063 | Iustin Pop | else:
|
75 | a8083063 | Iustin Pop | self.fail_reason = "unable to determine termination reason" |
76 | a8083063 | Iustin Pop | |
77 | a8083063 | Iustin Pop | def _GetOutput(self): |
78 | a8083063 | Iustin Pop | """Returns the combined stdout and stderr for easier usage.
|
79 | a8083063 | Iustin Pop |
|
80 | a8083063 | Iustin Pop | """
|
81 | a8083063 | Iustin Pop | return self.stdout + self.stderr |
82 | a8083063 | Iustin Pop | |
83 | a8083063 | Iustin Pop | output = property(_GetOutput, None, None, "Return full output") |
84 | a8083063 | Iustin Pop | |
85 | a8083063 | Iustin Pop | |
86 | a8083063 | Iustin Pop | def _GetLockFile(subsystem): |
87 | a8083063 | Iustin Pop | """Compute the file name for a given lock name."""
|
88 | a8083063 | Iustin Pop | return "/var/lock/ganeti_lock_%s" % subsystem |
89 | a8083063 | Iustin Pop | |
90 | a8083063 | Iustin Pop | |
91 | a8083063 | Iustin Pop | def Lock(name, max_retries=None, debug=False): |
92 | a8083063 | Iustin Pop | """Lock a given subsystem.
|
93 | a8083063 | Iustin Pop |
|
94 | a8083063 | Iustin Pop | In case the lock is already held by an alive process, the function
|
95 | a8083063 | Iustin Pop | will sleep indefintely and poll with a one second interval.
|
96 | a8083063 | Iustin Pop |
|
97 | a8083063 | Iustin Pop | When the optional integer argument 'max_retries' is passed with a
|
98 | a8083063 | Iustin Pop | non-zero value, the function will sleep only for this number of
|
99 | a8083063 | Iustin Pop | times, and then it will will raise a LockError if the lock can't be
|
100 | a8083063 | Iustin Pop | acquired. Passing in a negative number will cause only one try to
|
101 | a8083063 | Iustin Pop | get the lock. Passing a positive number will make the function retry
|
102 | a8083063 | Iustin Pop | for approximately that number of seconds.
|
103 | a8083063 | Iustin Pop |
|
104 | a8083063 | Iustin Pop | """
|
105 | a8083063 | Iustin Pop | lockfile = _GetLockFile(name) |
106 | a8083063 | Iustin Pop | |
107 | a8083063 | Iustin Pop | if name in _locksheld: |
108 | a8083063 | Iustin Pop | raise errors.LockError('Lock "%s" already held!' % (name,)) |
109 | a8083063 | Iustin Pop | |
110 | a8083063 | Iustin Pop | errcount = 0
|
111 | a8083063 | Iustin Pop | |
112 | a8083063 | Iustin Pop | retries = 0
|
113 | a8083063 | Iustin Pop | while True: |
114 | a8083063 | Iustin Pop | try:
|
115 | a8083063 | Iustin Pop | fd = os.open(lockfile, os.O_CREAT | os.O_EXCL | os.O_RDWR | os.O_SYNC) |
116 | a8083063 | Iustin Pop | break
|
117 | a8083063 | Iustin Pop | except OSError, creat_err: |
118 | a8083063 | Iustin Pop | if creat_err.errno != EEXIST:
|
119 | 3ecf6786 | Iustin Pop | raise errors.LockError("Can't create the lock file. Error '%s'." % |
120 | 3ecf6786 | Iustin Pop | str(creat_err))
|
121 | a8083063 | Iustin Pop | |
122 | a8083063 | Iustin Pop | try:
|
123 | a8083063 | Iustin Pop | pf = open(lockfile, 'r') |
124 | a8083063 | Iustin Pop | except IOError, open_err: |
125 | a8083063 | Iustin Pop | errcount += 1
|
126 | a8083063 | Iustin Pop | if errcount >= 5: |
127 | 3ecf6786 | Iustin Pop | raise errors.LockError("Lock file exists but cannot be opened." |
128 | 3ecf6786 | Iustin Pop | " Error: '%s'." % str(open_err)) |
129 | a8083063 | Iustin Pop | time.sleep(1)
|
130 | a8083063 | Iustin Pop | continue
|
131 | a8083063 | Iustin Pop | |
132 | a8083063 | Iustin Pop | try:
|
133 | a8083063 | Iustin Pop | pid = int(pf.read())
|
134 | a8083063 | Iustin Pop | except ValueError: |
135 | 3ecf6786 | Iustin Pop | raise errors.LockError("Invalid pid string in %s" % |
136 | a8083063 | Iustin Pop | (lockfile,)) |
137 | a8083063 | Iustin Pop | |
138 | a8083063 | Iustin Pop | if not IsProcessAlive(pid): |
139 | 3ecf6786 | Iustin Pop | raise errors.LockError("Stale lockfile %s for pid %d?" % |
140 | 3ecf6786 | Iustin Pop | (lockfile, pid)) |
141 | a8083063 | Iustin Pop | |
142 | a8083063 | Iustin Pop | if max_retries and max_retries <= retries: |
143 | 3ecf6786 | Iustin Pop | raise errors.LockError("Can't acquire lock during the specified" |
144 | 3ecf6786 | Iustin Pop | " time, aborting.")
|
145 | a8083063 | Iustin Pop | if retries == 5 and (debug or sys.stdin.isatty()): |
146 | a8083063 | Iustin Pop | logger.ToStderr("Waiting for '%s' lock from pid %d..." % (name, pid))
|
147 | a8083063 | Iustin Pop | |
148 | a8083063 | Iustin Pop | time.sleep(1)
|
149 | a8083063 | Iustin Pop | retries += 1
|
150 | a8083063 | Iustin Pop | continue
|
151 | a8083063 | Iustin Pop | |
152 | a8083063 | Iustin Pop | os.write(fd, '%d\n' % (os.getpid(),))
|
153 | a8083063 | Iustin Pop | os.close(fd) |
154 | a8083063 | Iustin Pop | |
155 | a8083063 | Iustin Pop | _locksheld.append(name) |
156 | a8083063 | Iustin Pop | |
157 | a8083063 | Iustin Pop | |
158 | a8083063 | Iustin Pop | def Unlock(name): |
159 | 098c0958 | Michael Hanselmann | """Unlock a given subsystem.
|
160 | a8083063 | Iustin Pop |
|
161 | 098c0958 | Michael Hanselmann | """
|
162 | a8083063 | Iustin Pop | lockfile = _GetLockFile(name) |
163 | a8083063 | Iustin Pop | |
164 | a8083063 | Iustin Pop | try:
|
165 | a8083063 | Iustin Pop | fd = os.open(lockfile, os.O_RDONLY) |
166 | a8083063 | Iustin Pop | except OSError: |
167 | a8083063 | Iustin Pop | raise errors.LockError('Lock "%s" not held.' % (name,)) |
168 | a8083063 | Iustin Pop | |
169 | a8083063 | Iustin Pop | f = os.fdopen(fd, 'r')
|
170 | a8083063 | Iustin Pop | pid_str = f.read() |
171 | a8083063 | Iustin Pop | |
172 | a8083063 | Iustin Pop | try:
|
173 | a8083063 | Iustin Pop | pid = int(pid_str)
|
174 | a8083063 | Iustin Pop | except ValueError: |
175 | a8083063 | Iustin Pop | raise errors.LockError('Unable to determine PID of locking process.') |
176 | a8083063 | Iustin Pop | |
177 | a8083063 | Iustin Pop | if pid != os.getpid():
|
178 | a8083063 | Iustin Pop | raise errors.LockError('Lock not held by me (%d != %d)' % |
179 | a8083063 | Iustin Pop | (os.getpid(), pid,)) |
180 | a8083063 | Iustin Pop | |
181 | a8083063 | Iustin Pop | os.unlink(lockfile) |
182 | a8083063 | Iustin Pop | _locksheld.remove(name) |
183 | a8083063 | Iustin Pop | |
184 | a8083063 | Iustin Pop | |
185 | a8083063 | Iustin Pop | def LockCleanup(): |
186 | 098c0958 | Michael Hanselmann | """Remove all locks.
|
187 | a8083063 | Iustin Pop |
|
188 | 098c0958 | Michael Hanselmann | """
|
189 | a8083063 | Iustin Pop | for lock in _locksheld: |
190 | a8083063 | Iustin Pop | Unlock(lock) |
191 | a8083063 | Iustin Pop | |
192 | a8083063 | Iustin Pop | |
193 | a8083063 | Iustin Pop | def RunCmd(cmd): |
194 | a8083063 | Iustin Pop | """Execute a (shell) command.
|
195 | a8083063 | Iustin Pop |
|
196 | a8083063 | Iustin Pop | The command should not read from its standard input, as it will be
|
197 | a8083063 | Iustin Pop | closed.
|
198 | a8083063 | Iustin Pop |
|
199 | a8083063 | Iustin Pop | Args:
|
200 | a8083063 | Iustin Pop | cmd: command to run. (str)
|
201 | a8083063 | Iustin Pop |
|
202 | a8083063 | Iustin Pop | Returns: `RunResult` instance
|
203 | a8083063 | Iustin Pop |
|
204 | a8083063 | Iustin Pop | """
|
205 | a8083063 | Iustin Pop | if isinstance(cmd, list): |
206 | a8083063 | Iustin Pop | cmd = [str(val) for val in cmd] |
207 | a8083063 | Iustin Pop | child = popen2.Popen3(cmd, capturestderr=True)
|
208 | a8083063 | Iustin Pop | |
209 | a8083063 | Iustin Pop | child.tochild.close() |
210 | a8083063 | Iustin Pop | out = child.fromchild.read() |
211 | a8083063 | Iustin Pop | err = child.childerr.read() |
212 | a8083063 | Iustin Pop | |
213 | a8083063 | Iustin Pop | status = child.wait() |
214 | a8083063 | Iustin Pop | if os.WIFSIGNALED(status):
|
215 | a8083063 | Iustin Pop | signal = os.WTERMSIG(status) |
216 | a8083063 | Iustin Pop | else:
|
217 | a8083063 | Iustin Pop | signal = None
|
218 | a8083063 | Iustin Pop | if os.WIFEXITED(status):
|
219 | a8083063 | Iustin Pop | exitcode = os.WEXITSTATUS(status) |
220 | a8083063 | Iustin Pop | else:
|
221 | a8083063 | Iustin Pop | exitcode = None
|
222 | a8083063 | Iustin Pop | |
223 | a8083063 | Iustin Pop | if isinstance(cmd, list): |
224 | a8083063 | Iustin Pop | strcmd = " ".join(cmd)
|
225 | a8083063 | Iustin Pop | else:
|
226 | a8083063 | Iustin Pop | strcmd = str(cmd)
|
227 | a8083063 | Iustin Pop | |
228 | a8083063 | Iustin Pop | return RunResult(exitcode, signal, out, err, strcmd)
|
229 | a8083063 | Iustin Pop | |
230 | a8083063 | Iustin Pop | |
231 | a8083063 | Iustin Pop | def RunCmdUnlocked(cmd): |
232 | a8083063 | Iustin Pop | """Execute a shell command without the 'cmd' lock.
|
233 | a8083063 | Iustin Pop |
|
234 | a8083063 | Iustin Pop | This variant of `RunCmd()` drops the 'cmd' lock before running the
|
235 | a8083063 | Iustin Pop | command and re-aquires it afterwards, thus it can be used to call
|
236 | a8083063 | Iustin Pop | other ganeti commands.
|
237 | a8083063 | Iustin Pop |
|
238 | a8083063 | Iustin Pop | The argument and return values are the same as for the `RunCmd()`
|
239 | a8083063 | Iustin Pop | function.
|
240 | a8083063 | Iustin Pop |
|
241 | a8083063 | Iustin Pop | Args:
|
242 | a8083063 | Iustin Pop | cmd - command to run. (str)
|
243 | a8083063 | Iustin Pop |
|
244 | a8083063 | Iustin Pop | Returns:
|
245 | a8083063 | Iustin Pop | `RunResult`
|
246 | a8083063 | Iustin Pop |
|
247 | a8083063 | Iustin Pop | """
|
248 | a8083063 | Iustin Pop | Unlock('cmd')
|
249 | a8083063 | Iustin Pop | ret = RunCmd(cmd) |
250 | a8083063 | Iustin Pop | Lock('cmd')
|
251 | a8083063 | Iustin Pop | |
252 | a8083063 | Iustin Pop | return ret
|
253 | a8083063 | Iustin Pop | |
254 | a8083063 | Iustin Pop | |
255 | a8083063 | Iustin Pop | def RemoveFile(filename): |
256 | a8083063 | Iustin Pop | """Remove a file ignoring some errors.
|
257 | a8083063 | Iustin Pop |
|
258 | a8083063 | Iustin Pop | Remove a file, ignoring non-existing ones or directories. Other
|
259 | a8083063 | Iustin Pop | errors are passed.
|
260 | a8083063 | Iustin Pop |
|
261 | a8083063 | Iustin Pop | """
|
262 | a8083063 | Iustin Pop | try:
|
263 | a8083063 | Iustin Pop | os.unlink(filename) |
264 | a8083063 | Iustin Pop | except OSError, err: |
265 | a8083063 | Iustin Pop | if err.errno not in (ENOENT, EISDIR): |
266 | a8083063 | Iustin Pop | raise
|
267 | a8083063 | Iustin Pop | |
268 | a8083063 | Iustin Pop | |
269 | a8083063 | Iustin Pop | def _FingerprintFile(filename): |
270 | a8083063 | Iustin Pop | """Compute the fingerprint of a file.
|
271 | a8083063 | Iustin Pop |
|
272 | a8083063 | Iustin Pop | If the file does not exist, a None will be returned
|
273 | a8083063 | Iustin Pop | instead.
|
274 | a8083063 | Iustin Pop |
|
275 | a8083063 | Iustin Pop | Args:
|
276 | a8083063 | Iustin Pop | filename - Filename (str)
|
277 | a8083063 | Iustin Pop |
|
278 | a8083063 | Iustin Pop | """
|
279 | a8083063 | Iustin Pop | if not (os.path.exists(filename) and os.path.isfile(filename)): |
280 | a8083063 | Iustin Pop | return None |
281 | a8083063 | Iustin Pop | |
282 | a8083063 | Iustin Pop | f = open(filename)
|
283 | a8083063 | Iustin Pop | |
284 | a8083063 | Iustin Pop | fp = sha.sha() |
285 | a8083063 | Iustin Pop | while True: |
286 | a8083063 | Iustin Pop | data = f.read(4096)
|
287 | a8083063 | Iustin Pop | if not data: |
288 | a8083063 | Iustin Pop | break
|
289 | a8083063 | Iustin Pop | |
290 | a8083063 | Iustin Pop | fp.update(data) |
291 | a8083063 | Iustin Pop | |
292 | a8083063 | Iustin Pop | return fp.hexdigest()
|
293 | a8083063 | Iustin Pop | |
294 | a8083063 | Iustin Pop | |
295 | a8083063 | Iustin Pop | def FingerprintFiles(files): |
296 | a8083063 | Iustin Pop | """Compute fingerprints for a list of files.
|
297 | a8083063 | Iustin Pop |
|
298 | a8083063 | Iustin Pop | Args:
|
299 | a8083063 | Iustin Pop | files - array of filenames. ( [str, ...] )
|
300 | a8083063 | Iustin Pop |
|
301 | a8083063 | Iustin Pop | Return value:
|
302 | a8083063 | Iustin Pop | dictionary of filename: fingerprint for the files that exist
|
303 | a8083063 | Iustin Pop |
|
304 | a8083063 | Iustin Pop | """
|
305 | a8083063 | Iustin Pop | ret = {} |
306 | a8083063 | Iustin Pop | |
307 | a8083063 | Iustin Pop | for filename in files: |
308 | a8083063 | Iustin Pop | cksum = _FingerprintFile(filename) |
309 | a8083063 | Iustin Pop | if cksum:
|
310 | a8083063 | Iustin Pop | ret[filename] = cksum |
311 | a8083063 | Iustin Pop | |
312 | a8083063 | Iustin Pop | return ret
|
313 | a8083063 | Iustin Pop | |
314 | a8083063 | Iustin Pop | |
315 | a8083063 | Iustin Pop | def CheckDict(target, template, logname=None): |
316 | a8083063 | Iustin Pop | """Ensure a dictionary has a required set of keys.
|
317 | a8083063 | Iustin Pop |
|
318 | a8083063 | Iustin Pop | For the given dictionaries `target` and `template`, ensure target
|
319 | a8083063 | Iustin Pop | has all the keys from template. Missing keys are added with values
|
320 | a8083063 | Iustin Pop | from template.
|
321 | a8083063 | Iustin Pop |
|
322 | a8083063 | Iustin Pop | Args:
|
323 | a8083063 | Iustin Pop | target - the dictionary to check
|
324 | a8083063 | Iustin Pop | template - template dictionary
|
325 | a8083063 | Iustin Pop | logname - a caller-chosen string to identify the debug log
|
326 | a8083063 | Iustin Pop | entry; if None, no logging will be done
|
327 | a8083063 | Iustin Pop |
|
328 | a8083063 | Iustin Pop | Returns value:
|
329 | a8083063 | Iustin Pop | None
|
330 | a8083063 | Iustin Pop |
|
331 | a8083063 | Iustin Pop | """
|
332 | a8083063 | Iustin Pop | missing = [] |
333 | a8083063 | Iustin Pop | for k in template: |
334 | a8083063 | Iustin Pop | if k not in target: |
335 | a8083063 | Iustin Pop | missing.append(k) |
336 | a8083063 | Iustin Pop | target[k] = template[k] |
337 | a8083063 | Iustin Pop | |
338 | a8083063 | Iustin Pop | if missing and logname: |
339 | a8083063 | Iustin Pop | logger.Debug('%s missing keys %s' %
|
340 | a8083063 | Iustin Pop | (logname, ', '.join(missing)))
|
341 | a8083063 | Iustin Pop | |
342 | a8083063 | Iustin Pop | |
343 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
344 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
|
345 | a8083063 | Iustin Pop |
|
346 | a8083063 | Iustin Pop | Returns: true or false, depending on if the pid exists or not
|
347 | a8083063 | Iustin Pop |
|
348 | a8083063 | Iustin Pop | Remarks: zombie processes treated as not alive
|
349 | a8083063 | Iustin Pop |
|
350 | a8083063 | Iustin Pop | """
|
351 | a8083063 | Iustin Pop | try:
|
352 | a8083063 | Iustin Pop | f = open("/proc/%d/status" % pid) |
353 | a8083063 | Iustin Pop | except IOError, err: |
354 | a8083063 | Iustin Pop | if err.errno in (ENOENT, ENOTDIR): |
355 | a8083063 | Iustin Pop | return False |
356 | a8083063 | Iustin Pop | |
357 | a8083063 | Iustin Pop | alive = True
|
358 | a8083063 | Iustin Pop | try:
|
359 | a8083063 | Iustin Pop | data = f.readlines() |
360 | a8083063 | Iustin Pop | if len(data) > 1: |
361 | a8083063 | Iustin Pop | state = data[1].split()
|
362 | a8083063 | Iustin Pop | if len(state) > 1 and state[1] == "Z": |
363 | a8083063 | Iustin Pop | alive = False
|
364 | a8083063 | Iustin Pop | finally:
|
365 | a8083063 | Iustin Pop | f.close() |
366 | a8083063 | Iustin Pop | |
367 | a8083063 | Iustin Pop | return alive
|
368 | a8083063 | Iustin Pop | |
369 | a8083063 | Iustin Pop | |
370 | a8083063 | Iustin Pop | def MatchNameComponent(key, name_list): |
371 | a8083063 | Iustin Pop | """Try to match a name against a list.
|
372 | a8083063 | Iustin Pop |
|
373 | a8083063 | Iustin Pop | This function will try to match a name like test1 against a list
|
374 | a8083063 | Iustin Pop | like ['test1.example.com', 'test2.example.com', ...]. Against this
|
375 | a8083063 | Iustin Pop | list, 'test1' as well as 'test1.example' will match, but not
|
376 | a8083063 | Iustin Pop | 'test1.ex'. A multiple match will be considered as no match at all
|
377 | a8083063 | Iustin Pop | (e.g. 'test1' against ['test1.example.com', 'test1.example.org']).
|
378 | a8083063 | Iustin Pop |
|
379 | a8083063 | Iustin Pop | Args:
|
380 | a8083063 | Iustin Pop | key: the name to be searched
|
381 | a8083063 | Iustin Pop | name_list: the list of strings against which to search the key
|
382 | a8083063 | Iustin Pop |
|
383 | a8083063 | Iustin Pop | Returns:
|
384 | a8083063 | Iustin Pop | None if there is no match *or* if there are multiple matches
|
385 | a8083063 | Iustin Pop | otherwise the element from the list which matches
|
386 | a8083063 | Iustin Pop |
|
387 | a8083063 | Iustin Pop | """
|
388 | a8083063 | Iustin Pop | mo = re.compile("^%s(\..*)?$" % re.escape(key))
|
389 | a8083063 | Iustin Pop | names_filtered = [name for name in name_list if mo.match(name) is not None] |
390 | a8083063 | Iustin Pop | if len(names_filtered) != 1: |
391 | a8083063 | Iustin Pop | return None |
392 | a8083063 | Iustin Pop | return names_filtered[0] |
393 | a8083063 | Iustin Pop | |
394 | a8083063 | Iustin Pop | |
395 | a8083063 | Iustin Pop | def LookupHostname(hostname): |
396 | a8083063 | Iustin Pop | """Look up hostname
|
397 | a8083063 | Iustin Pop |
|
398 | a8083063 | Iustin Pop | Args:
|
399 | a8083063 | Iustin Pop | hostname: hostname to look up, can be also be a non FQDN
|
400 | a8083063 | Iustin Pop |
|
401 | a8083063 | Iustin Pop | Returns:
|
402 | a8083063 | Iustin Pop | Dictionary with keys:
|
403 | a8083063 | Iustin Pop | - ip: IP addr
|
404 | a8083063 | Iustin Pop | - hostname_full: hostname fully qualified
|
405 | a8083063 | Iustin Pop | - hostname: hostname fully qualified (historic artifact)
|
406 | a8083063 | Iustin Pop |
|
407 | 098c0958 | Michael Hanselmann | """
|
408 | a8083063 | Iustin Pop | try:
|
409 | a8083063 | Iustin Pop | (fqdn, dummy, ipaddrs) = socket.gethostbyname_ex(hostname) |
410 | a8083063 | Iustin Pop | ipaddr = ipaddrs[0]
|
411 | a8083063 | Iustin Pop | except socket.gaierror:
|
412 | a8083063 | Iustin Pop | # hostname not found in DNS
|
413 | a8083063 | Iustin Pop | return None |
414 | a8083063 | Iustin Pop | |
415 | a8083063 | Iustin Pop | returnhostname = { |
416 | a8083063 | Iustin Pop | "ip": ipaddr,
|
417 | a8083063 | Iustin Pop | "hostname_full": fqdn,
|
418 | a8083063 | Iustin Pop | "hostname": fqdn,
|
419 | a8083063 | Iustin Pop | } |
420 | a8083063 | Iustin Pop | |
421 | a8083063 | Iustin Pop | return returnhostname
|
422 | a8083063 | Iustin Pop | |
423 | a8083063 | Iustin Pop | |
424 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
425 | a8083063 | Iustin Pop | """List volume groups and their size
|
426 | a8083063 | Iustin Pop |
|
427 | a8083063 | Iustin Pop | Returns:
|
428 | a8083063 | Iustin Pop | Dictionary with keys volume name and values the size of the volume
|
429 | a8083063 | Iustin Pop |
|
430 | a8083063 | Iustin Pop | """
|
431 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
432 | a8083063 | Iustin Pop | result = RunCmd(command) |
433 | a8083063 | Iustin Pop | retval = {} |
434 | a8083063 | Iustin Pop | if result.failed:
|
435 | a8083063 | Iustin Pop | return retval
|
436 | a8083063 | Iustin Pop | |
437 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
438 | a8083063 | Iustin Pop | try:
|
439 | a8083063 | Iustin Pop | name, size = line.split() |
440 | a8083063 | Iustin Pop | size = int(float(size)) |
441 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
442 | a8083063 | Iustin Pop | logger.Error("Invalid output from vgs (%s): %s" % (err, line))
|
443 | a8083063 | Iustin Pop | continue
|
444 | a8083063 | Iustin Pop | |
445 | a8083063 | Iustin Pop | retval[name] = size |
446 | a8083063 | Iustin Pop | |
447 | a8083063 | Iustin Pop | return retval
|
448 | a8083063 | Iustin Pop | |
449 | a8083063 | Iustin Pop | |
450 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
451 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
452 | a8083063 | Iustin Pop |
|
453 | a8083063 | Iustin Pop | Returns:
|
454 | a8083063 | Iustin Pop | True if it does, false otherwise.
|
455 | a8083063 | Iustin Pop |
|
456 | a8083063 | Iustin Pop | """
|
457 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
458 | a8083063 | Iustin Pop | |
459 | a8083063 | Iustin Pop | |
460 | a8083063 | Iustin Pop | def NiceSort(name_list): |
461 | a8083063 | Iustin Pop | """Sort a list of strings based on digit and non-digit groupings.
|
462 | a8083063 | Iustin Pop |
|
463 | a8083063 | Iustin Pop | Given a list of names ['a1', 'a10', 'a11', 'a2'] this function will
|
464 | a8083063 | Iustin Pop | sort the list in the logical order ['a1', 'a2', 'a10', 'a11'].
|
465 | a8083063 | Iustin Pop |
|
466 | a8083063 | Iustin Pop | The sort algorithm breaks each name in groups of either only-digits
|
467 | a8083063 | Iustin Pop | or no-digits. Only the first eight such groups are considered, and
|
468 | a8083063 | Iustin Pop | after that we just use what's left of the string.
|
469 | a8083063 | Iustin Pop |
|
470 | a8083063 | Iustin Pop | Return value
|
471 | a8083063 | Iustin Pop | - a copy of the list sorted according to our algorithm
|
472 | a8083063 | Iustin Pop |
|
473 | a8083063 | Iustin Pop | """
|
474 | a8083063 | Iustin Pop | _SORTER_BASE = "(\D+|\d+)"
|
475 | a8083063 | Iustin Pop | _SORTER_FULL = "^%s%s?%s?%s?%s?%s?%s?%s?.*$" % (_SORTER_BASE, _SORTER_BASE,
|
476 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
477 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
478 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE) |
479 | a8083063 | Iustin Pop | _SORTER_RE = re.compile(_SORTER_FULL) |
480 | a8083063 | Iustin Pop | _SORTER_NODIGIT = re.compile("^\D*$")
|
481 | a8083063 | Iustin Pop | def _TryInt(val): |
482 | a8083063 | Iustin Pop | """Attempts to convert a variable to integer."""
|
483 | a8083063 | Iustin Pop | if val is None or _SORTER_NODIGIT.match(val): |
484 | a8083063 | Iustin Pop | return val
|
485 | a8083063 | Iustin Pop | rval = int(val)
|
486 | a8083063 | Iustin Pop | return rval
|
487 | a8083063 | Iustin Pop | |
488 | a8083063 | Iustin Pop | to_sort = [([_TryInt(grp) for grp in _SORTER_RE.match(name).groups()], name) |
489 | a8083063 | Iustin Pop | for name in name_list] |
490 | a8083063 | Iustin Pop | to_sort.sort() |
491 | a8083063 | Iustin Pop | return [tup[1] for tup in to_sort] |
492 | a8083063 | Iustin Pop | |
493 | a8083063 | Iustin Pop | |
494 | a8083063 | Iustin Pop | def CheckDaemonAlive(pid_file, process_string): |
495 | a8083063 | Iustin Pop | """Check wether the specified daemon is alive.
|
496 | a8083063 | Iustin Pop |
|
497 | a8083063 | Iustin Pop | Args:
|
498 | a8083063 | Iustin Pop | - pid_file: file to read the daemon pid from, the file is
|
499 | a8083063 | Iustin Pop | expected to contain only a single line containing
|
500 | a8083063 | Iustin Pop | only the PID
|
501 | a8083063 | Iustin Pop | - process_string: a substring that we expect to find in
|
502 | a8083063 | Iustin Pop | the command line of the daemon process
|
503 | a8083063 | Iustin Pop |
|
504 | a8083063 | Iustin Pop | Returns:
|
505 | a8083063 | Iustin Pop | - True if the daemon is judged to be alive (that is:
|
506 | a8083063 | Iustin Pop | - the PID file exists, is readable and contains a number
|
507 | a8083063 | Iustin Pop | - a process of the specified PID is running
|
508 | a8083063 | Iustin Pop | - that process contains the specified string in its
|
509 | a8083063 | Iustin Pop | command line
|
510 | a8083063 | Iustin Pop | - the process is not in state Z (zombie))
|
511 | a8083063 | Iustin Pop | - False otherwise
|
512 | a8083063 | Iustin Pop |
|
513 | a8083063 | Iustin Pop | """
|
514 | a8083063 | Iustin Pop | try:
|
515 | a8083063 | Iustin Pop | pid_file = file(pid_file, 'r') |
516 | a8083063 | Iustin Pop | try:
|
517 | a8083063 | Iustin Pop | pid = int(pid_file.readline())
|
518 | a8083063 | Iustin Pop | finally:
|
519 | a8083063 | Iustin Pop | pid_file.close() |
520 | a8083063 | Iustin Pop | |
521 | a8083063 | Iustin Pop | cmdline_file_path = "/proc/%s/cmdline" % (pid)
|
522 | a8083063 | Iustin Pop | cmdline_file = open(cmdline_file_path, 'r') |
523 | a8083063 | Iustin Pop | try:
|
524 | a8083063 | Iustin Pop | cmdline = cmdline_file.readline() |
525 | a8083063 | Iustin Pop | finally:
|
526 | a8083063 | Iustin Pop | cmdline_file.close() |
527 | a8083063 | Iustin Pop | |
528 | a8083063 | Iustin Pop | if not process_string in cmdline: |
529 | a8083063 | Iustin Pop | return False |
530 | a8083063 | Iustin Pop | |
531 | a8083063 | Iustin Pop | stat_file_path = "/proc/%s/stat" % (pid)
|
532 | a8083063 | Iustin Pop | stat_file = open(stat_file_path, 'r') |
533 | a8083063 | Iustin Pop | try:
|
534 | a8083063 | Iustin Pop | process_state = stat_file.readline().split()[2]
|
535 | a8083063 | Iustin Pop | finally:
|
536 | a8083063 | Iustin Pop | stat_file.close() |
537 | a8083063 | Iustin Pop | |
538 | a8083063 | Iustin Pop | if process_state == 'Z': |
539 | a8083063 | Iustin Pop | return False |
540 | a8083063 | Iustin Pop | |
541 | a8083063 | Iustin Pop | except (IndexError, IOError, ValueError): |
542 | a8083063 | Iustin Pop | return False |
543 | a8083063 | Iustin Pop | |
544 | a8083063 | Iustin Pop | return True |
545 | a8083063 | Iustin Pop | |
546 | a8083063 | Iustin Pop | |
547 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
548 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
549 | a8083063 | Iustin Pop |
|
550 | a8083063 | Iustin Pop | This function tries to apply function `fn` to `val`. If no
|
551 | a8083063 | Iustin Pop | ValueError or TypeError exceptions are raised, it will return the
|
552 | a8083063 | Iustin Pop | result, else it will return the original value. Any other exceptions
|
553 | a8083063 | Iustin Pop | are propagated to the caller.
|
554 | a8083063 | Iustin Pop |
|
555 | a8083063 | Iustin Pop | """
|
556 | a8083063 | Iustin Pop | try:
|
557 | a8083063 | Iustin Pop | nv = fn(val) |
558 | a8083063 | Iustin Pop | except (ValueError, TypeError), err: |
559 | a8083063 | Iustin Pop | nv = val |
560 | a8083063 | Iustin Pop | return nv
|
561 | a8083063 | Iustin Pop | |
562 | a8083063 | Iustin Pop | |
563 | a8083063 | Iustin Pop | def IsValidIP(ip): |
564 | a8083063 | Iustin Pop | """Verifies the syntax of an IP address.
|
565 | a8083063 | Iustin Pop |
|
566 | a8083063 | Iustin Pop | This function checks if the ip address passes is valid or not based
|
567 | a8083063 | Iustin Pop | on syntax (not ip range, class calculations or anything).
|
568 | a8083063 | Iustin Pop |
|
569 | a8083063 | Iustin Pop | """
|
570 | a8083063 | Iustin Pop | unit = "(0|[1-9]\d{0,2})"
|
571 | a8083063 | Iustin Pop | return re.match("^%s\.%s\.%s\.%s$" % (unit, unit, unit, unit), ip) |
572 | a8083063 | Iustin Pop | |
573 | a8083063 | Iustin Pop | |
574 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
575 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
576 | a8083063 | Iustin Pop |
|
577 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
578 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
579 | a8083063 | Iustin Pop | the actual command.
|
580 | a8083063 | Iustin Pop |
|
581 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
582 | a8083063 | Iustin Pop | side.
|
583 | a8083063 | Iustin Pop |
|
584 | a8083063 | Iustin Pop | """
|
585 | a8083063 | Iustin Pop | return bool(re.match("^[-a-zA-Z0-9._+/:%@]+$", word)) |
586 | a8083063 | Iustin Pop | |
587 | a8083063 | Iustin Pop | |
588 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
589 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
590 | a8083063 | Iustin Pop |
|
591 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
592 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
593 | a8083063 | Iustin Pop | metacharaters). If everything is ok, it will return the result of
|
594 | a8083063 | Iustin Pop | template % args.
|
595 | a8083063 | Iustin Pop |
|
596 | a8083063 | Iustin Pop | """
|
597 | a8083063 | Iustin Pop | for word in args: |
598 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
599 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
600 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
601 | a8083063 | Iustin Pop | return template % args
|
602 | a8083063 | Iustin Pop | |
603 | a8083063 | Iustin Pop | |
604 | a8083063 | Iustin Pop | def FormatUnit(value): |
605 | a8083063 | Iustin Pop | """Formats an incoming number of MiB with the appropriate unit.
|
606 | a8083063 | Iustin Pop |
|
607 | a8083063 | Iustin Pop | Value needs to be passed as a numeric type. Return value is always a string.
|
608 | a8083063 | Iustin Pop |
|
609 | a8083063 | Iustin Pop | """
|
610 | a8083063 | Iustin Pop | if value < 1024: |
611 | a8083063 | Iustin Pop | return "%dM" % round(value, 0) |
612 | a8083063 | Iustin Pop | |
613 | a8083063 | Iustin Pop | elif value < (1024 * 1024): |
614 | a8083063 | Iustin Pop | return "%0.1fG" % round(float(value) / 1024, 1) |
615 | a8083063 | Iustin Pop | |
616 | a8083063 | Iustin Pop | else:
|
617 | a8083063 | Iustin Pop | return "%0.1fT" % round(float(value) / 1024 / 1024, 1) |
618 | a8083063 | Iustin Pop | |
619 | a8083063 | Iustin Pop | |
620 | a8083063 | Iustin Pop | def ParseUnit(input_string): |
621 | a8083063 | Iustin Pop | """Tries to extract number and scale from the given string.
|
622 | a8083063 | Iustin Pop |
|
623 | a8083063 | Iustin Pop | Input must be in the format NUMBER+ [DOT NUMBER+] SPACE* [UNIT]. If no unit
|
624 | a8083063 | Iustin Pop | is specified, it defaults to MiB. Return value is always an int in MiB.
|
625 | a8083063 | Iustin Pop |
|
626 | a8083063 | Iustin Pop | """
|
627 | a8083063 | Iustin Pop | m = re.match('^([.\d]+)\s*([a-zA-Z]+)?$', input_string)
|
628 | a8083063 | Iustin Pop | if not m: |
629 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Invalid format") |
630 | a8083063 | Iustin Pop | |
631 | a8083063 | Iustin Pop | value = float(m.groups()[0]) |
632 | a8083063 | Iustin Pop | |
633 | a8083063 | Iustin Pop | unit = m.groups()[1]
|
634 | a8083063 | Iustin Pop | if unit:
|
635 | a8083063 | Iustin Pop | lcunit = unit.lower() |
636 | a8083063 | Iustin Pop | else:
|
637 | a8083063 | Iustin Pop | lcunit = 'm'
|
638 | a8083063 | Iustin Pop | |
639 | a8083063 | Iustin Pop | if lcunit in ('m', 'mb', 'mib'): |
640 | a8083063 | Iustin Pop | # Value already in MiB
|
641 | a8083063 | Iustin Pop | pass
|
642 | a8083063 | Iustin Pop | |
643 | a8083063 | Iustin Pop | elif lcunit in ('g', 'gb', 'gib'): |
644 | a8083063 | Iustin Pop | value *= 1024
|
645 | a8083063 | Iustin Pop | |
646 | a8083063 | Iustin Pop | elif lcunit in ('t', 'tb', 'tib'): |
647 | a8083063 | Iustin Pop | value *= 1024 * 1024 |
648 | a8083063 | Iustin Pop | |
649 | a8083063 | Iustin Pop | else:
|
650 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Unknown unit: %s" % unit) |
651 | a8083063 | Iustin Pop | |
652 | a8083063 | Iustin Pop | # Make sure we round up
|
653 | a8083063 | Iustin Pop | if int(value) < value: |
654 | a8083063 | Iustin Pop | value += 1
|
655 | a8083063 | Iustin Pop | |
656 | a8083063 | Iustin Pop | # Round up to the next multiple of 4
|
657 | a8083063 | Iustin Pop | value = int(value)
|
658 | a8083063 | Iustin Pop | if value % 4: |
659 | a8083063 | Iustin Pop | value += 4 - value % 4 |
660 | a8083063 | Iustin Pop | |
661 | a8083063 | Iustin Pop | return value
|
662 | a8083063 | Iustin Pop | |
663 | a8083063 | Iustin Pop | |
664 | a8083063 | Iustin Pop | def AddAuthorizedKey(file_name, key): |
665 | a8083063 | Iustin Pop | """Adds an SSH public key to an authorized_keys file.
|
666 | a8083063 | Iustin Pop |
|
667 | a8083063 | Iustin Pop | Args:
|
668 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
669 | a8083063 | Iustin Pop | key: String containing key
|
670 | a8083063 | Iustin Pop | """
|
671 | a8083063 | Iustin Pop | key_fields = key.split() |
672 | a8083063 | Iustin Pop | |
673 | a8083063 | Iustin Pop | f = open(file_name, 'a+') |
674 | a8083063 | Iustin Pop | try:
|
675 | a8083063 | Iustin Pop | nl = True
|
676 | a8083063 | Iustin Pop | for line in f: |
677 | a8083063 | Iustin Pop | # Ignore whitespace changes
|
678 | a8083063 | Iustin Pop | if line.split() == key_fields:
|
679 | a8083063 | Iustin Pop | break
|
680 | a8083063 | Iustin Pop | nl = line.endswith('\n')
|
681 | a8083063 | Iustin Pop | else:
|
682 | a8083063 | Iustin Pop | if not nl: |
683 | a8083063 | Iustin Pop | f.write("\n")
|
684 | a8083063 | Iustin Pop | f.write(key.rstrip('\r\n'))
|
685 | a8083063 | Iustin Pop | f.write("\n")
|
686 | a8083063 | Iustin Pop | f.flush() |
687 | a8083063 | Iustin Pop | finally:
|
688 | a8083063 | Iustin Pop | f.close() |
689 | a8083063 | Iustin Pop | |
690 | a8083063 | Iustin Pop | |
691 | a8083063 | Iustin Pop | def RemoveAuthorizedKey(file_name, key): |
692 | a8083063 | Iustin Pop | """Removes an SSH public key from an authorized_keys file.
|
693 | a8083063 | Iustin Pop |
|
694 | a8083063 | Iustin Pop | Args:
|
695 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
696 | a8083063 | Iustin Pop | key: String containing key
|
697 | a8083063 | Iustin Pop | """
|
698 | a8083063 | Iustin Pop | key_fields = key.split() |
699 | a8083063 | Iustin Pop | |
700 | a8083063 | Iustin Pop | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
701 | a8083063 | Iustin Pop | out = os.fdopen(fd, 'w')
|
702 | a8083063 | Iustin Pop | try:
|
703 | a8083063 | Iustin Pop | f = open(file_name, 'r') |
704 | a8083063 | Iustin Pop | try:
|
705 | a8083063 | Iustin Pop | for line in f: |
706 | a8083063 | Iustin Pop | # Ignore whitespace changes while comparing lines
|
707 | a8083063 | Iustin Pop | if line.split() != key_fields:
|
708 | a8083063 | Iustin Pop | out.write(line) |
709 | a8083063 | Iustin Pop | |
710 | a8083063 | Iustin Pop | out.flush() |
711 | a8083063 | Iustin Pop | os.rename(tmpname, file_name) |
712 | a8083063 | Iustin Pop | finally:
|
713 | a8083063 | Iustin Pop | f.close() |
714 | a8083063 | Iustin Pop | finally:
|
715 | a8083063 | Iustin Pop | out.close() |
716 | a8083063 | Iustin Pop | |
717 | a8083063 | Iustin Pop | |
718 | a8083063 | Iustin Pop | def CreateBackup(file_name): |
719 | a8083063 | Iustin Pop | """Creates a backup of a file.
|
720 | a8083063 | Iustin Pop |
|
721 | a8083063 | Iustin Pop | Returns: the path to the newly created backup file.
|
722 | a8083063 | Iustin Pop |
|
723 | a8083063 | Iustin Pop | """
|
724 | a8083063 | Iustin Pop | if not os.path.isfile(file_name): |
725 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Can't make a backup of a non-file '%s'" % |
726 | 3ecf6786 | Iustin Pop | file_name) |
727 | a8083063 | Iustin Pop | |
728 | a8083063 | Iustin Pop | # Warning: the following code contains a race condition when we create more
|
729 | a8083063 | Iustin Pop | # than one backup of the same file in a second.
|
730 | a8083063 | Iustin Pop | backup_name = file_name + '.backup-%d' % int(time.time()) |
731 | a8083063 | Iustin Pop | shutil.copyfile(file_name, backup_name) |
732 | a8083063 | Iustin Pop | return backup_name
|
733 | a8083063 | Iustin Pop | |
734 | a8083063 | Iustin Pop | |
735 | a8083063 | Iustin Pop | def ShellQuote(value): |
736 | a8083063 | Iustin Pop | """Quotes shell argument according to POSIX.
|
737 | 3ecf6786 | Iustin Pop |
|
738 | a8083063 | Iustin Pop | """
|
739 | a8083063 | Iustin Pop | if _re_shell_unquoted.match(value):
|
740 | a8083063 | Iustin Pop | return value
|
741 | a8083063 | Iustin Pop | else:
|
742 | a8083063 | Iustin Pop | return "'%s'" % value.replace("'", "'\\''") |
743 | a8083063 | Iustin Pop | |
744 | a8083063 | Iustin Pop | |
745 | a8083063 | Iustin Pop | def ShellQuoteArgs(args): |
746 | a8083063 | Iustin Pop | """Quotes all given shell arguments and concatenates using spaces.
|
747 | a8083063 | Iustin Pop |
|
748 | a8083063 | Iustin Pop | """
|
749 | a8083063 | Iustin Pop | return ' '.join([ShellQuote(i) for i in args]) |