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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | a8083063 | Iustin Pop | # Copyright (C) 2006, 2007 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Ganeti small utilities
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23 | 899d2a81 | Michael Hanselmann |
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24 | a8083063 | Iustin Pop | """
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25 | a8083063 | Iustin Pop | |
26 | a8083063 | Iustin Pop | |
27 | a8083063 | Iustin Pop | import sys |
28 | a8083063 | Iustin Pop | import os |
29 | a8083063 | Iustin Pop | import sha |
30 | a8083063 | Iustin Pop | import time |
31 | 113b55aa | Iustin Pop | import subprocess |
32 | a8083063 | Iustin Pop | import re |
33 | a8083063 | Iustin Pop | import socket |
34 | a8083063 | Iustin Pop | import tempfile |
35 | a8083063 | Iustin Pop | import shutil |
36 | 4ca1b175 | Alexander Schreiber | import errno |
37 | 2f8b60b3 | Iustin Pop | import pwd |
38 | 78feb6fb | Guido Trotter | import itertools |
39 | 9c233417 | Iustin Pop | import select |
40 | 9c233417 | Iustin Pop | import fcntl |
41 | 8f765069 | Iustin Pop | import resource |
42 | bb698c1f | Iustin Pop | import logging |
43 | 9c233417 | Iustin Pop | |
44 | 9c233417 | Iustin Pop | from cStringIO import StringIO |
45 | a8083063 | Iustin Pop | |
46 | a8083063 | Iustin Pop | from ganeti import errors |
47 | 3aecd2c7 | Iustin Pop | from ganeti import constants |
48 | a8083063 | Iustin Pop | |
49 | 16abfbc2 | Alexander Schreiber | |
50 | a8083063 | Iustin Pop | _locksheld = [] |
51 | a8083063 | Iustin Pop | _re_shell_unquoted = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
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52 | a8083063 | Iustin Pop | |
53 | f362096f | Iustin Pop | debug = False
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54 | b74159ee | Iustin Pop | no_fork = False
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55 | f362096f | Iustin Pop | |
56 | 7c0d6283 | Michael Hanselmann | |
57 | a8083063 | Iustin Pop | class RunResult(object): |
58 | a8083063 | Iustin Pop | """Simple class for holding the result of running external programs.
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59 | a8083063 | Iustin Pop |
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60 | a8083063 | Iustin Pop | Instance variables:
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61 | a8083063 | Iustin Pop | exit_code: the exit code of the program, or None (if the program
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62 | a8083063 | Iustin Pop | didn't exit())
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63 | a8083063 | Iustin Pop | signal: numeric signal that caused the program to finish, or None
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64 | a8083063 | Iustin Pop | (if the program wasn't terminated by a signal)
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65 | a8083063 | Iustin Pop | stdout: the standard output of the program
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66 | a8083063 | Iustin Pop | stderr: the standard error of the program
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67 | a8083063 | Iustin Pop | failed: a Boolean value which is True in case the program was
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68 | a8083063 | Iustin Pop | terminated by a signal or exited with a non-zero exit code
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69 | a8083063 | Iustin Pop | fail_reason: a string detailing the termination reason
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70 | a8083063 | Iustin Pop |
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71 | a8083063 | Iustin Pop | """
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72 | a8083063 | Iustin Pop | __slots__ = ["exit_code", "signal", "stdout", "stderr", |
73 | a8083063 | Iustin Pop | "failed", "fail_reason", "cmd"] |
74 | a8083063 | Iustin Pop | |
75 | a8083063 | Iustin Pop | |
76 | a8083063 | Iustin Pop | def __init__(self, exit_code, signal, stdout, stderr, cmd): |
77 | a8083063 | Iustin Pop | self.cmd = cmd
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78 | a8083063 | Iustin Pop | self.exit_code = exit_code
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79 | a8083063 | Iustin Pop | self.signal = signal
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80 | a8083063 | Iustin Pop | self.stdout = stdout
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81 | a8083063 | Iustin Pop | self.stderr = stderr
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82 | a8083063 | Iustin Pop | self.failed = (signal is not None or exit_code != 0) |
83 | a8083063 | Iustin Pop | |
84 | a8083063 | Iustin Pop | if self.signal is not None: |
85 | a8083063 | Iustin Pop | self.fail_reason = "terminated by signal %s" % self.signal |
86 | a8083063 | Iustin Pop | elif self.exit_code is not None: |
87 | a8083063 | Iustin Pop | self.fail_reason = "exited with exit code %s" % self.exit_code |
88 | a8083063 | Iustin Pop | else:
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89 | a8083063 | Iustin Pop | self.fail_reason = "unable to determine termination reason" |
90 | a8083063 | Iustin Pop | |
91 | bb698c1f | Iustin Pop | if self.failed: |
92 | bb698c1f | Iustin Pop | logging.debug("Command '%s' failed (%s); output: %s",
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93 | bb698c1f | Iustin Pop | self.cmd, self.fail_reason, self.output) |
94 | f362096f | Iustin Pop | |
95 | a8083063 | Iustin Pop | def _GetOutput(self): |
96 | a8083063 | Iustin Pop | """Returns the combined stdout and stderr for easier usage.
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97 | a8083063 | Iustin Pop |
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98 | a8083063 | Iustin Pop | """
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99 | a8083063 | Iustin Pop | return self.stdout + self.stderr |
100 | a8083063 | Iustin Pop | |
101 | a8083063 | Iustin Pop | output = property(_GetOutput, None, None, "Return full output") |
102 | a8083063 | Iustin Pop | |
103 | a8083063 | Iustin Pop | |
104 | a8083063 | Iustin Pop | def RunCmd(cmd): |
105 | a8083063 | Iustin Pop | """Execute a (shell) command.
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106 | a8083063 | Iustin Pop |
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107 | a8083063 | Iustin Pop | The command should not read from its standard input, as it will be
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108 | a8083063 | Iustin Pop | closed.
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109 | a8083063 | Iustin Pop |
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110 | a8083063 | Iustin Pop | Args:
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111 | a8083063 | Iustin Pop | cmd: command to run. (str)
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112 | a8083063 | Iustin Pop |
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113 | a8083063 | Iustin Pop | Returns: `RunResult` instance
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114 | a8083063 | Iustin Pop |
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115 | a8083063 | Iustin Pop | """
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116 | b74159ee | Iustin Pop | if no_fork:
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117 | b74159ee | Iustin Pop | raise errors.ProgrammerError("utils.RunCmd() called with fork() disabled") |
118 | b74159ee | Iustin Pop | |
119 | a8083063 | Iustin Pop | if isinstance(cmd, list): |
120 | a8083063 | Iustin Pop | cmd = [str(val) for val in cmd] |
121 | 113b55aa | Iustin Pop | strcmd = " ".join(cmd)
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122 | 113b55aa | Iustin Pop | shell = False
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123 | 113b55aa | Iustin Pop | else:
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124 | 113b55aa | Iustin Pop | strcmd = cmd |
125 | 113b55aa | Iustin Pop | shell = True
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126 | bb698c1f | Iustin Pop | logging.debug("RunCmd '%s'", strcmd)
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127 | 23f41a3e | Michael Hanselmann | env = os.environ.copy() |
128 | 23f41a3e | Michael Hanselmann | env["LC_ALL"] = "C" |
129 | 9c233417 | Iustin Pop | poller = select.poll() |
130 | 113b55aa | Iustin Pop | child = subprocess.Popen(cmd, shell=shell, |
131 | 113b55aa | Iustin Pop | stderr=subprocess.PIPE, |
132 | 113b55aa | Iustin Pop | stdout=subprocess.PIPE, |
133 | 113b55aa | Iustin Pop | stdin=subprocess.PIPE, |
134 | 23f41a3e | Michael Hanselmann | close_fds=True, env=env)
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135 | 113b55aa | Iustin Pop | |
136 | 113b55aa | Iustin Pop | child.stdin.close() |
137 | 9c233417 | Iustin Pop | poller.register(child.stdout, select.POLLIN) |
138 | 9c233417 | Iustin Pop | poller.register(child.stderr, select.POLLIN) |
139 | 9c233417 | Iustin Pop | out = StringIO() |
140 | 9c233417 | Iustin Pop | err = StringIO() |
141 | 9c233417 | Iustin Pop | fdmap = { |
142 | 9c233417 | Iustin Pop | child.stdout.fileno(): (out, child.stdout), |
143 | 9c233417 | Iustin Pop | child.stderr.fileno(): (err, child.stderr), |
144 | 9c233417 | Iustin Pop | } |
145 | 9c233417 | Iustin Pop | for fd in fdmap: |
146 | 9c233417 | Iustin Pop | status = fcntl.fcntl(fd, fcntl.F_GETFL) |
147 | 9c233417 | Iustin Pop | fcntl.fcntl(fd, fcntl.F_SETFL, status | os.O_NONBLOCK) |
148 | 9c233417 | Iustin Pop | |
149 | 9c233417 | Iustin Pop | while fdmap:
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150 | 9c233417 | Iustin Pop | for fd, event in poller.poll(): |
151 | 9c233417 | Iustin Pop | if event & select.POLLIN or event & select.POLLPRI: |
152 | 9c233417 | Iustin Pop | data = fdmap[fd][1].read()
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153 | 9c233417 | Iustin Pop | # no data from read signifies EOF (the same as POLLHUP)
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154 | 9c233417 | Iustin Pop | if not data: |
155 | 9c233417 | Iustin Pop | poller.unregister(fd) |
156 | 9c233417 | Iustin Pop | del fdmap[fd]
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157 | 9c233417 | Iustin Pop | continue
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158 | 9c233417 | Iustin Pop | fdmap[fd][0].write(data)
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159 | 9c233417 | Iustin Pop | if (event & select.POLLNVAL or event & select.POLLHUP or |
160 | 9c233417 | Iustin Pop | event & select.POLLERR): |
161 | 9c233417 | Iustin Pop | poller.unregister(fd) |
162 | 9c233417 | Iustin Pop | del fdmap[fd]
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163 | 9c233417 | Iustin Pop | |
164 | 9c233417 | Iustin Pop | out = out.getvalue() |
165 | 9c233417 | Iustin Pop | err = err.getvalue() |
166 | a8083063 | Iustin Pop | |
167 | a8083063 | Iustin Pop | status = child.wait() |
168 | 113b55aa | Iustin Pop | if status >= 0: |
169 | 113b55aa | Iustin Pop | exitcode = status |
170 | a8083063 | Iustin Pop | signal = None
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171 | a8083063 | Iustin Pop | else:
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172 | a8083063 | Iustin Pop | exitcode = None
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173 | 113b55aa | Iustin Pop | signal = -status |
174 | a8083063 | Iustin Pop | |
175 | a8083063 | Iustin Pop | return RunResult(exitcode, signal, out, err, strcmd)
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176 | a8083063 | Iustin Pop | |
177 | a8083063 | Iustin Pop | |
178 | a8083063 | Iustin Pop | def RemoveFile(filename): |
179 | a8083063 | Iustin Pop | """Remove a file ignoring some errors.
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180 | a8083063 | Iustin Pop |
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181 | a8083063 | Iustin Pop | Remove a file, ignoring non-existing ones or directories. Other
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182 | a8083063 | Iustin Pop | errors are passed.
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183 | a8083063 | Iustin Pop |
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184 | a8083063 | Iustin Pop | """
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185 | a8083063 | Iustin Pop | try:
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186 | a8083063 | Iustin Pop | os.unlink(filename) |
187 | a8083063 | Iustin Pop | except OSError, err: |
188 | 4ca1b175 | Alexander Schreiber | if err.errno not in (errno.ENOENT, errno.EISDIR): |
189 | a8083063 | Iustin Pop | raise
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190 | a8083063 | Iustin Pop | |
191 | a8083063 | Iustin Pop | |
192 | a8083063 | Iustin Pop | def _FingerprintFile(filename): |
193 | a8083063 | Iustin Pop | """Compute the fingerprint of a file.
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194 | a8083063 | Iustin Pop |
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195 | a8083063 | Iustin Pop | If the file does not exist, a None will be returned
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196 | a8083063 | Iustin Pop | instead.
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197 | a8083063 | Iustin Pop |
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198 | a8083063 | Iustin Pop | Args:
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199 | a8083063 | Iustin Pop | filename - Filename (str)
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200 | a8083063 | Iustin Pop |
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201 | a8083063 | Iustin Pop | """
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202 | a8083063 | Iustin Pop | if not (os.path.exists(filename) and os.path.isfile(filename)): |
203 | a8083063 | Iustin Pop | return None |
204 | a8083063 | Iustin Pop | |
205 | a8083063 | Iustin Pop | f = open(filename)
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206 | a8083063 | Iustin Pop | |
207 | a8083063 | Iustin Pop | fp = sha.sha() |
208 | a8083063 | Iustin Pop | while True: |
209 | a8083063 | Iustin Pop | data = f.read(4096)
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210 | a8083063 | Iustin Pop | if not data: |
211 | a8083063 | Iustin Pop | break
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212 | a8083063 | Iustin Pop | |
213 | a8083063 | Iustin Pop | fp.update(data) |
214 | a8083063 | Iustin Pop | |
215 | a8083063 | Iustin Pop | return fp.hexdigest()
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216 | a8083063 | Iustin Pop | |
217 | a8083063 | Iustin Pop | |
218 | a8083063 | Iustin Pop | def FingerprintFiles(files): |
219 | a8083063 | Iustin Pop | """Compute fingerprints for a list of files.
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220 | a8083063 | Iustin Pop |
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221 | a8083063 | Iustin Pop | Args:
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222 | a8083063 | Iustin Pop | files - array of filenames. ( [str, ...] )
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223 | a8083063 | Iustin Pop |
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224 | a8083063 | Iustin Pop | Return value:
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225 | a8083063 | Iustin Pop | dictionary of filename: fingerprint for the files that exist
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226 | a8083063 | Iustin Pop |
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227 | a8083063 | Iustin Pop | """
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228 | a8083063 | Iustin Pop | ret = {} |
229 | a8083063 | Iustin Pop | |
230 | a8083063 | Iustin Pop | for filename in files: |
231 | a8083063 | Iustin Pop | cksum = _FingerprintFile(filename) |
232 | a8083063 | Iustin Pop | if cksum:
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233 | a8083063 | Iustin Pop | ret[filename] = cksum |
234 | a8083063 | Iustin Pop | |
235 | a8083063 | Iustin Pop | return ret
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236 | a8083063 | Iustin Pop | |
237 | a8083063 | Iustin Pop | |
238 | a8083063 | Iustin Pop | def CheckDict(target, template, logname=None): |
239 | a8083063 | Iustin Pop | """Ensure a dictionary has a required set of keys.
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240 | a8083063 | Iustin Pop |
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241 | a8083063 | Iustin Pop | For the given dictionaries `target` and `template`, ensure target
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242 | a8083063 | Iustin Pop | has all the keys from template. Missing keys are added with values
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243 | a8083063 | Iustin Pop | from template.
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244 | a8083063 | Iustin Pop |
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245 | a8083063 | Iustin Pop | Args:
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246 | a8083063 | Iustin Pop | target - the dictionary to check
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247 | a8083063 | Iustin Pop | template - template dictionary
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248 | a8083063 | Iustin Pop | logname - a caller-chosen string to identify the debug log
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249 | a8083063 | Iustin Pop | entry; if None, no logging will be done
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250 | a8083063 | Iustin Pop |
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251 | a8083063 | Iustin Pop | Returns value:
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252 | a8083063 | Iustin Pop | None
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253 | a8083063 | Iustin Pop |
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254 | a8083063 | Iustin Pop | """
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255 | a8083063 | Iustin Pop | missing = [] |
256 | a8083063 | Iustin Pop | for k in template: |
257 | a8083063 | Iustin Pop | if k not in target: |
258 | a8083063 | Iustin Pop | missing.append(k) |
259 | a8083063 | Iustin Pop | target[k] = template[k] |
260 | a8083063 | Iustin Pop | |
261 | a8083063 | Iustin Pop | if missing and logname: |
262 | bb698c1f | Iustin Pop | logging.warning('%s missing keys %s', logname, ', '.join(missing)) |
263 | a8083063 | Iustin Pop | |
264 | a8083063 | Iustin Pop | |
265 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
266 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
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267 | a8083063 | Iustin Pop |
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268 | a8083063 | Iustin Pop | Returns: true or false, depending on if the pid exists or not
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269 | a8083063 | Iustin Pop |
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270 | a8083063 | Iustin Pop | Remarks: zombie processes treated as not alive
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271 | a8083063 | Iustin Pop |
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272 | a8083063 | Iustin Pop | """
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273 | a8083063 | Iustin Pop | try:
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274 | a8083063 | Iustin Pop | f = open("/proc/%d/status" % pid) |
275 | a8083063 | Iustin Pop | except IOError, err: |
276 | 4ca1b175 | Alexander Schreiber | if err.errno in (errno.ENOENT, errno.ENOTDIR): |
277 | a8083063 | Iustin Pop | return False |
278 | a8083063 | Iustin Pop | |
279 | a8083063 | Iustin Pop | alive = True
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280 | a8083063 | Iustin Pop | try:
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281 | a8083063 | Iustin Pop | data = f.readlines() |
282 | a8083063 | Iustin Pop | if len(data) > 1: |
283 | a8083063 | Iustin Pop | state = data[1].split()
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284 | a8083063 | Iustin Pop | if len(state) > 1 and state[1] == "Z": |
285 | a8083063 | Iustin Pop | alive = False
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286 | a8083063 | Iustin Pop | finally:
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287 | a8083063 | Iustin Pop | f.close() |
288 | a8083063 | Iustin Pop | |
289 | a8083063 | Iustin Pop | return alive
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290 | a8083063 | Iustin Pop | |
291 | a8083063 | Iustin Pop | |
292 | a8083063 | Iustin Pop | def MatchNameComponent(key, name_list): |
293 | a8083063 | Iustin Pop | """Try to match a name against a list.
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294 | a8083063 | Iustin Pop |
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295 | a8083063 | Iustin Pop | This function will try to match a name like test1 against a list
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296 | a8083063 | Iustin Pop | like ['test1.example.com', 'test2.example.com', ...]. Against this
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297 | a8083063 | Iustin Pop | list, 'test1' as well as 'test1.example' will match, but not
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298 | a8083063 | Iustin Pop | 'test1.ex'. A multiple match will be considered as no match at all
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299 | a8083063 | Iustin Pop | (e.g. 'test1' against ['test1.example.com', 'test1.example.org']).
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300 | a8083063 | Iustin Pop |
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301 | a8083063 | Iustin Pop | Args:
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302 | a8083063 | Iustin Pop | key: the name to be searched
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303 | a8083063 | Iustin Pop | name_list: the list of strings against which to search the key
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304 | a8083063 | Iustin Pop |
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305 | a8083063 | Iustin Pop | Returns:
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306 | a8083063 | Iustin Pop | None if there is no match *or* if there are multiple matches
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307 | a8083063 | Iustin Pop | otherwise the element from the list which matches
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308 | a8083063 | Iustin Pop |
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309 | a8083063 | Iustin Pop | """
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310 | a8083063 | Iustin Pop | mo = re.compile("^%s(\..*)?$" % re.escape(key))
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311 | a8083063 | Iustin Pop | names_filtered = [name for name in name_list if mo.match(name) is not None] |
312 | a8083063 | Iustin Pop | if len(names_filtered) != 1: |
313 | a8083063 | Iustin Pop | return None |
314 | a8083063 | Iustin Pop | return names_filtered[0] |
315 | a8083063 | Iustin Pop | |
316 | a8083063 | Iustin Pop | |
317 | bcf043c9 | Iustin Pop | class HostInfo: |
318 | 89e1fc26 | Iustin Pop | """Class implementing resolver and hostname functionality
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319 | bcf043c9 | Iustin Pop |
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320 | bcf043c9 | Iustin Pop | """
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321 | 89e1fc26 | Iustin Pop | def __init__(self, name=None): |
322 | bcf043c9 | Iustin Pop | """Initialize the host name object.
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323 | bcf043c9 | Iustin Pop |
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324 | 89e1fc26 | Iustin Pop | If the name argument is not passed, it will use this system's
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325 | 89e1fc26 | Iustin Pop | name.
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326 | bcf043c9 | Iustin Pop |
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327 | bcf043c9 | Iustin Pop | """
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328 | 89e1fc26 | Iustin Pop | if name is None: |
329 | 89e1fc26 | Iustin Pop | name = self.SysName()
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330 | 89e1fc26 | Iustin Pop | |
331 | 89e1fc26 | Iustin Pop | self.query = name
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332 | 89e1fc26 | Iustin Pop | self.name, self.aliases, self.ipaddrs = self.LookupHostname(name) |
333 | bcf043c9 | Iustin Pop | self.ip = self.ipaddrs[0] |
334 | bcf043c9 | Iustin Pop | |
335 | c8a0948f | Michael Hanselmann | def ShortName(self): |
336 | c8a0948f | Michael Hanselmann | """Returns the hostname without domain.
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337 | c8a0948f | Michael Hanselmann |
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338 | c8a0948f | Michael Hanselmann | """
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339 | c8a0948f | Michael Hanselmann | return self.name.split('.')[0] |
340 | c8a0948f | Michael Hanselmann | |
341 | 89e1fc26 | Iustin Pop | @staticmethod
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342 | 89e1fc26 | Iustin Pop | def SysName(): |
343 | 89e1fc26 | Iustin Pop | """Return the current system's name.
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344 | bcf043c9 | Iustin Pop |
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345 | 89e1fc26 | Iustin Pop | This is simply a wrapper over socket.gethostname()
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346 | a8083063 | Iustin Pop |
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347 | 89e1fc26 | Iustin Pop | """
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348 | 89e1fc26 | Iustin Pop | return socket.gethostname()
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349 | a8083063 | Iustin Pop | |
350 | 89e1fc26 | Iustin Pop | @staticmethod
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351 | 89e1fc26 | Iustin Pop | def LookupHostname(hostname): |
352 | 89e1fc26 | Iustin Pop | """Look up hostname
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353 | a8083063 | Iustin Pop |
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354 | 89e1fc26 | Iustin Pop | Args:
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355 | 89e1fc26 | Iustin Pop | hostname: hostname to look up
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356 | 89e1fc26 | Iustin Pop |
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357 | 89e1fc26 | Iustin Pop | Returns:
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358 | 89e1fc26 | Iustin Pop | a tuple (name, aliases, ipaddrs) as returned by socket.gethostbyname_ex
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359 | 89e1fc26 | Iustin Pop | in case of errors in resolving, we raise a ResolverError
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360 | 89e1fc26 | Iustin Pop |
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361 | 89e1fc26 | Iustin Pop | """
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362 | 89e1fc26 | Iustin Pop | try:
|
363 | 89e1fc26 | Iustin Pop | result = socket.gethostbyname_ex(hostname) |
364 | 89e1fc26 | Iustin Pop | except socket.gaierror, err:
|
365 | 89e1fc26 | Iustin Pop | # hostname not found in DNS
|
366 | 89e1fc26 | Iustin Pop | raise errors.ResolverError(hostname, err.args[0], err.args[1]) |
367 | a8083063 | Iustin Pop | |
368 | 89e1fc26 | Iustin Pop | return result
|
369 | a8083063 | Iustin Pop | |
370 | a8083063 | Iustin Pop | |
371 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
372 | a8083063 | Iustin Pop | """List volume groups and their size
|
373 | a8083063 | Iustin Pop |
|
374 | a8083063 | Iustin Pop | Returns:
|
375 | a8083063 | Iustin Pop | Dictionary with keys volume name and values the size of the volume
|
376 | a8083063 | Iustin Pop |
|
377 | a8083063 | Iustin Pop | """
|
378 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
379 | a8083063 | Iustin Pop | result = RunCmd(command) |
380 | a8083063 | Iustin Pop | retval = {} |
381 | a8083063 | Iustin Pop | if result.failed:
|
382 | a8083063 | Iustin Pop | return retval
|
383 | a8083063 | Iustin Pop | |
384 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
385 | a8083063 | Iustin Pop | try:
|
386 | a8083063 | Iustin Pop | name, size = line.split() |
387 | a8083063 | Iustin Pop | size = int(float(size)) |
388 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
389 | bb698c1f | Iustin Pop | logging.error("Invalid output from vgs (%s): %s", err, line)
|
390 | a8083063 | Iustin Pop | continue
|
391 | a8083063 | Iustin Pop | |
392 | a8083063 | Iustin Pop | retval[name] = size |
393 | a8083063 | Iustin Pop | |
394 | a8083063 | Iustin Pop | return retval
|
395 | a8083063 | Iustin Pop | |
396 | a8083063 | Iustin Pop | |
397 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
398 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
399 | a8083063 | Iustin Pop |
|
400 | a8083063 | Iustin Pop | Returns:
|
401 | a8083063 | Iustin Pop | True if it does, false otherwise.
|
402 | a8083063 | Iustin Pop |
|
403 | a8083063 | Iustin Pop | """
|
404 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
405 | a8083063 | Iustin Pop | |
406 | a8083063 | Iustin Pop | |
407 | a8083063 | Iustin Pop | def NiceSort(name_list): |
408 | a8083063 | Iustin Pop | """Sort a list of strings based on digit and non-digit groupings.
|
409 | a8083063 | Iustin Pop |
|
410 | a8083063 | Iustin Pop | Given a list of names ['a1', 'a10', 'a11', 'a2'] this function will
|
411 | a8083063 | Iustin Pop | sort the list in the logical order ['a1', 'a2', 'a10', 'a11'].
|
412 | a8083063 | Iustin Pop |
|
413 | a8083063 | Iustin Pop | The sort algorithm breaks each name in groups of either only-digits
|
414 | a8083063 | Iustin Pop | or no-digits. Only the first eight such groups are considered, and
|
415 | a8083063 | Iustin Pop | after that we just use what's left of the string.
|
416 | a8083063 | Iustin Pop |
|
417 | a8083063 | Iustin Pop | Return value
|
418 | a8083063 | Iustin Pop | - a copy of the list sorted according to our algorithm
|
419 | a8083063 | Iustin Pop |
|
420 | a8083063 | Iustin Pop | """
|
421 | a8083063 | Iustin Pop | _SORTER_BASE = "(\D+|\d+)"
|
422 | a8083063 | Iustin Pop | _SORTER_FULL = "^%s%s?%s?%s?%s?%s?%s?%s?.*$" % (_SORTER_BASE, _SORTER_BASE,
|
423 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
424 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
425 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE) |
426 | a8083063 | Iustin Pop | _SORTER_RE = re.compile(_SORTER_FULL) |
427 | a8083063 | Iustin Pop | _SORTER_NODIGIT = re.compile("^\D*$")
|
428 | a8083063 | Iustin Pop | def _TryInt(val): |
429 | a8083063 | Iustin Pop | """Attempts to convert a variable to integer."""
|
430 | a8083063 | Iustin Pop | if val is None or _SORTER_NODIGIT.match(val): |
431 | a8083063 | Iustin Pop | return val
|
432 | a8083063 | Iustin Pop | rval = int(val)
|
433 | a8083063 | Iustin Pop | return rval
|
434 | a8083063 | Iustin Pop | |
435 | a8083063 | Iustin Pop | to_sort = [([_TryInt(grp) for grp in _SORTER_RE.match(name).groups()], name) |
436 | a8083063 | Iustin Pop | for name in name_list] |
437 | a8083063 | Iustin Pop | to_sort.sort() |
438 | a8083063 | Iustin Pop | return [tup[1] for tup in to_sort] |
439 | a8083063 | Iustin Pop | |
440 | a8083063 | Iustin Pop | |
441 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
442 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
443 | a8083063 | Iustin Pop |
|
444 | a8083063 | Iustin Pop | This function tries to apply function `fn` to `val`. If no
|
445 | a8083063 | Iustin Pop | ValueError or TypeError exceptions are raised, it will return the
|
446 | a8083063 | Iustin Pop | result, else it will return the original value. Any other exceptions
|
447 | a8083063 | Iustin Pop | are propagated to the caller.
|
448 | a8083063 | Iustin Pop |
|
449 | a8083063 | Iustin Pop | """
|
450 | a8083063 | Iustin Pop | try:
|
451 | a8083063 | Iustin Pop | nv = fn(val) |
452 | a8083063 | Iustin Pop | except (ValueError, TypeError), err: |
453 | a8083063 | Iustin Pop | nv = val |
454 | a8083063 | Iustin Pop | return nv
|
455 | a8083063 | Iustin Pop | |
456 | a8083063 | Iustin Pop | |
457 | a8083063 | Iustin Pop | def IsValidIP(ip): |
458 | a8083063 | Iustin Pop | """Verifies the syntax of an IP address.
|
459 | a8083063 | Iustin Pop |
|
460 | a8083063 | Iustin Pop | This function checks if the ip address passes is valid or not based
|
461 | a8083063 | Iustin Pop | on syntax (not ip range, class calculations or anything).
|
462 | a8083063 | Iustin Pop |
|
463 | a8083063 | Iustin Pop | """
|
464 | a8083063 | Iustin Pop | unit = "(0|[1-9]\d{0,2})"
|
465 | a8083063 | Iustin Pop | return re.match("^%s\.%s\.%s\.%s$" % (unit, unit, unit, unit), ip) |
466 | a8083063 | Iustin Pop | |
467 | a8083063 | Iustin Pop | |
468 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
469 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
470 | a8083063 | Iustin Pop |
|
471 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
472 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
473 | a8083063 | Iustin Pop | the actual command.
|
474 | a8083063 | Iustin Pop |
|
475 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
476 | a8083063 | Iustin Pop | side.
|
477 | a8083063 | Iustin Pop |
|
478 | a8083063 | Iustin Pop | """
|
479 | a8083063 | Iustin Pop | return bool(re.match("^[-a-zA-Z0-9._+/:%@]+$", word)) |
480 | a8083063 | Iustin Pop | |
481 | a8083063 | Iustin Pop | |
482 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
483 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
484 | a8083063 | Iustin Pop |
|
485 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
486 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
487 | a8083063 | Iustin Pop | metacharaters). If everything is ok, it will return the result of
|
488 | a8083063 | Iustin Pop | template % args.
|
489 | a8083063 | Iustin Pop |
|
490 | a8083063 | Iustin Pop | """
|
491 | a8083063 | Iustin Pop | for word in args: |
492 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
493 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
494 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
495 | a8083063 | Iustin Pop | return template % args
|
496 | a8083063 | Iustin Pop | |
497 | a8083063 | Iustin Pop | |
498 | a8083063 | Iustin Pop | def FormatUnit(value): |
499 | a8083063 | Iustin Pop | """Formats an incoming number of MiB with the appropriate unit.
|
500 | a8083063 | Iustin Pop |
|
501 | a8083063 | Iustin Pop | Value needs to be passed as a numeric type. Return value is always a string.
|
502 | a8083063 | Iustin Pop |
|
503 | a8083063 | Iustin Pop | """
|
504 | a8083063 | Iustin Pop | if value < 1024: |
505 | a8083063 | Iustin Pop | return "%dM" % round(value, 0) |
506 | a8083063 | Iustin Pop | |
507 | a8083063 | Iustin Pop | elif value < (1024 * 1024): |
508 | a8083063 | Iustin Pop | return "%0.1fG" % round(float(value) / 1024, 1) |
509 | a8083063 | Iustin Pop | |
510 | a8083063 | Iustin Pop | else:
|
511 | a8083063 | Iustin Pop | return "%0.1fT" % round(float(value) / 1024 / 1024, 1) |
512 | a8083063 | Iustin Pop | |
513 | a8083063 | Iustin Pop | |
514 | a8083063 | Iustin Pop | def ParseUnit(input_string): |
515 | a8083063 | Iustin Pop | """Tries to extract number and scale from the given string.
|
516 | a8083063 | Iustin Pop |
|
517 | a8083063 | Iustin Pop | Input must be in the format NUMBER+ [DOT NUMBER+] SPACE* [UNIT]. If no unit
|
518 | a8083063 | Iustin Pop | is specified, it defaults to MiB. Return value is always an int in MiB.
|
519 | a8083063 | Iustin Pop |
|
520 | a8083063 | Iustin Pop | """
|
521 | a8083063 | Iustin Pop | m = re.match('^([.\d]+)\s*([a-zA-Z]+)?$', input_string)
|
522 | a8083063 | Iustin Pop | if not m: |
523 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Invalid format") |
524 | a8083063 | Iustin Pop | |
525 | a8083063 | Iustin Pop | value = float(m.groups()[0]) |
526 | a8083063 | Iustin Pop | |
527 | a8083063 | Iustin Pop | unit = m.groups()[1]
|
528 | a8083063 | Iustin Pop | if unit:
|
529 | a8083063 | Iustin Pop | lcunit = unit.lower() |
530 | a8083063 | Iustin Pop | else:
|
531 | a8083063 | Iustin Pop | lcunit = 'm'
|
532 | a8083063 | Iustin Pop | |
533 | a8083063 | Iustin Pop | if lcunit in ('m', 'mb', 'mib'): |
534 | a8083063 | Iustin Pop | # Value already in MiB
|
535 | a8083063 | Iustin Pop | pass
|
536 | a8083063 | Iustin Pop | |
537 | a8083063 | Iustin Pop | elif lcunit in ('g', 'gb', 'gib'): |
538 | a8083063 | Iustin Pop | value *= 1024
|
539 | a8083063 | Iustin Pop | |
540 | a8083063 | Iustin Pop | elif lcunit in ('t', 'tb', 'tib'): |
541 | a8083063 | Iustin Pop | value *= 1024 * 1024 |
542 | a8083063 | Iustin Pop | |
543 | a8083063 | Iustin Pop | else:
|
544 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Unknown unit: %s" % unit) |
545 | a8083063 | Iustin Pop | |
546 | a8083063 | Iustin Pop | # Make sure we round up
|
547 | a8083063 | Iustin Pop | if int(value) < value: |
548 | a8083063 | Iustin Pop | value += 1
|
549 | a8083063 | Iustin Pop | |
550 | a8083063 | Iustin Pop | # Round up to the next multiple of 4
|
551 | a8083063 | Iustin Pop | value = int(value)
|
552 | a8083063 | Iustin Pop | if value % 4: |
553 | a8083063 | Iustin Pop | value += 4 - value % 4 |
554 | a8083063 | Iustin Pop | |
555 | a8083063 | Iustin Pop | return value
|
556 | a8083063 | Iustin Pop | |
557 | a8083063 | Iustin Pop | |
558 | a8083063 | Iustin Pop | def AddAuthorizedKey(file_name, key): |
559 | a8083063 | Iustin Pop | """Adds an SSH public key to an authorized_keys file.
|
560 | a8083063 | Iustin Pop |
|
561 | a8083063 | Iustin Pop | Args:
|
562 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
563 | a8083063 | Iustin Pop | key: String containing key
|
564 | a8083063 | Iustin Pop | """
|
565 | a8083063 | Iustin Pop | key_fields = key.split() |
566 | a8083063 | Iustin Pop | |
567 | a8083063 | Iustin Pop | f = open(file_name, 'a+') |
568 | a8083063 | Iustin Pop | try:
|
569 | a8083063 | Iustin Pop | nl = True
|
570 | a8083063 | Iustin Pop | for line in f: |
571 | a8083063 | Iustin Pop | # Ignore whitespace changes
|
572 | a8083063 | Iustin Pop | if line.split() == key_fields:
|
573 | a8083063 | Iustin Pop | break
|
574 | a8083063 | Iustin Pop | nl = line.endswith('\n')
|
575 | a8083063 | Iustin Pop | else:
|
576 | a8083063 | Iustin Pop | if not nl: |
577 | a8083063 | Iustin Pop | f.write("\n")
|
578 | a8083063 | Iustin Pop | f.write(key.rstrip('\r\n'))
|
579 | a8083063 | Iustin Pop | f.write("\n")
|
580 | a8083063 | Iustin Pop | f.flush() |
581 | a8083063 | Iustin Pop | finally:
|
582 | a8083063 | Iustin Pop | f.close() |
583 | a8083063 | Iustin Pop | |
584 | a8083063 | Iustin Pop | |
585 | a8083063 | Iustin Pop | def RemoveAuthorizedKey(file_name, key): |
586 | a8083063 | Iustin Pop | """Removes an SSH public key from an authorized_keys file.
|
587 | a8083063 | Iustin Pop |
|
588 | a8083063 | Iustin Pop | Args:
|
589 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
590 | a8083063 | Iustin Pop | key: String containing key
|
591 | a8083063 | Iustin Pop | """
|
592 | a8083063 | Iustin Pop | key_fields = key.split() |
593 | a8083063 | Iustin Pop | |
594 | a8083063 | Iustin Pop | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
595 | a8083063 | Iustin Pop | try:
|
596 | 59f82e3f | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
597 | a8083063 | Iustin Pop | try:
|
598 | 59f82e3f | Michael Hanselmann | f = open(file_name, 'r') |
599 | 59f82e3f | Michael Hanselmann | try:
|
600 | 59f82e3f | Michael Hanselmann | for line in f: |
601 | 59f82e3f | Michael Hanselmann | # Ignore whitespace changes while comparing lines
|
602 | 59f82e3f | Michael Hanselmann | if line.split() != key_fields:
|
603 | 59f82e3f | Michael Hanselmann | out.write(line) |
604 | 899d2a81 | Michael Hanselmann | |
605 | 899d2a81 | Michael Hanselmann | out.flush() |
606 | 899d2a81 | Michael Hanselmann | os.rename(tmpname, file_name) |
607 | 899d2a81 | Michael Hanselmann | finally:
|
608 | 899d2a81 | Michael Hanselmann | f.close() |
609 | 899d2a81 | Michael Hanselmann | finally:
|
610 | 899d2a81 | Michael Hanselmann | out.close() |
611 | 899d2a81 | Michael Hanselmann | except:
|
612 | 899d2a81 | Michael Hanselmann | RemoveFile(tmpname) |
613 | 899d2a81 | Michael Hanselmann | raise
|
614 | 899d2a81 | Michael Hanselmann | |
615 | 899d2a81 | Michael Hanselmann | |
616 | 9440aeab | Michael Hanselmann | def SetEtcHostsEntry(file_name, ip, hostname, aliases): |
617 | 9440aeab | Michael Hanselmann | """Sets the name of an IP address and hostname in /etc/hosts.
|
618 | 899d2a81 | Michael Hanselmann |
|
619 | 899d2a81 | Michael Hanselmann | """
|
620 | 7fbb1f65 | Michael Hanselmann | # Ensure aliases are unique
|
621 | 7fbb1f65 | Michael Hanselmann | aliases = UniqueSequence([hostname] + aliases)[1:]
|
622 | 7fbb1f65 | Michael Hanselmann | |
623 | 9440aeab | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
624 | 899d2a81 | Michael Hanselmann | try:
|
625 | 9440aeab | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
626 | 9440aeab | Michael Hanselmann | try:
|
627 | 9440aeab | Michael Hanselmann | f = open(file_name, 'r') |
628 | 9440aeab | Michael Hanselmann | try:
|
629 | 9440aeab | Michael Hanselmann | written = False
|
630 | 9440aeab | Michael Hanselmann | for line in f: |
631 | 9440aeab | Michael Hanselmann | fields = line.split() |
632 | 7e3dbb94 | Iustin Pop | if fields and not fields[0].startswith('#') and ip == fields[0]: |
633 | 9440aeab | Michael Hanselmann | continue
|
634 | 9440aeab | Michael Hanselmann | out.write(line) |
635 | 9440aeab | Michael Hanselmann | |
636 | 7e3dbb94 | Iustin Pop | out.write("%s\t%s" % (ip, hostname))
|
637 | 9440aeab | Michael Hanselmann | if aliases:
|
638 | 9440aeab | Michael Hanselmann | out.write(" %s" % ' '.join(aliases)) |
639 | 9440aeab | Michael Hanselmann | out.write('\n')
|
640 | 9440aeab | Michael Hanselmann | |
641 | 9440aeab | Michael Hanselmann | out.flush() |
642 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
643 | 9440aeab | Michael Hanselmann | os.rename(tmpname, file_name) |
644 | 9440aeab | Michael Hanselmann | finally:
|
645 | 9440aeab | Michael Hanselmann | f.close() |
646 | 9440aeab | Michael Hanselmann | finally:
|
647 | 9440aeab | Michael Hanselmann | out.close() |
648 | 9440aeab | Michael Hanselmann | except:
|
649 | 9440aeab | Michael Hanselmann | RemoveFile(tmpname) |
650 | 9440aeab | Michael Hanselmann | raise
|
651 | 899d2a81 | Michael Hanselmann | |
652 | 899d2a81 | Michael Hanselmann | |
653 | d9c02ca6 | Michael Hanselmann | def AddHostToEtcHosts(hostname): |
654 | d9c02ca6 | Michael Hanselmann | """Wrapper around SetEtcHostsEntry.
|
655 | d9c02ca6 | Michael Hanselmann |
|
656 | d9c02ca6 | Michael Hanselmann | """
|
657 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
658 | d9c02ca6 | Michael Hanselmann | SetEtcHostsEntry(constants.ETC_HOSTS, hi.ip, hi.name, [hi.ShortName()]) |
659 | d9c02ca6 | Michael Hanselmann | |
660 | d9c02ca6 | Michael Hanselmann | |
661 | 899d2a81 | Michael Hanselmann | def RemoveEtcHostsEntry(file_name, hostname): |
662 | 3e1cdf9f | Michael Hanselmann | """Removes a hostname from /etc/hosts.
|
663 | 899d2a81 | Michael Hanselmann |
|
664 | 9440aeab | Michael Hanselmann | IP addresses without names are removed from the file.
|
665 | 899d2a81 | Michael Hanselmann | """
|
666 | 899d2a81 | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
667 | 899d2a81 | Michael Hanselmann | try:
|
668 | 899d2a81 | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
669 | 899d2a81 | Michael Hanselmann | try:
|
670 | 899d2a81 | Michael Hanselmann | f = open(file_name, 'r') |
671 | 899d2a81 | Michael Hanselmann | try:
|
672 | 899d2a81 | Michael Hanselmann | for line in f: |
673 | 899d2a81 | Michael Hanselmann | fields = line.split() |
674 | 899d2a81 | Michael Hanselmann | if len(fields) > 1 and not fields[0].startswith('#'): |
675 | 899d2a81 | Michael Hanselmann | names = fields[1:]
|
676 | 899d2a81 | Michael Hanselmann | if hostname in names: |
677 | 899d2a81 | Michael Hanselmann | while hostname in names: |
678 | 899d2a81 | Michael Hanselmann | names.remove(hostname) |
679 | 899d2a81 | Michael Hanselmann | if names:
|
680 | 9440aeab | Michael Hanselmann | out.write("%s %s\n" % (fields[0], ' '.join(names))) |
681 | 899d2a81 | Michael Hanselmann | continue
|
682 | 899d2a81 | Michael Hanselmann | |
683 | 899d2a81 | Michael Hanselmann | out.write(line) |
684 | 59f82e3f | Michael Hanselmann | |
685 | 59f82e3f | Michael Hanselmann | out.flush() |
686 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
687 | 59f82e3f | Michael Hanselmann | os.rename(tmpname, file_name) |
688 | 59f82e3f | Michael Hanselmann | finally:
|
689 | 59f82e3f | Michael Hanselmann | f.close() |
690 | a8083063 | Iustin Pop | finally:
|
691 | 59f82e3f | Michael Hanselmann | out.close() |
692 | 59f82e3f | Michael Hanselmann | except:
|
693 | 59f82e3f | Michael Hanselmann | RemoveFile(tmpname) |
694 | 59f82e3f | Michael Hanselmann | raise
|
695 | a8083063 | Iustin Pop | |
696 | a8083063 | Iustin Pop | |
697 | d9c02ca6 | Michael Hanselmann | def RemoveHostFromEtcHosts(hostname): |
698 | d9c02ca6 | Michael Hanselmann | """Wrapper around RemoveEtcHostsEntry.
|
699 | d9c02ca6 | Michael Hanselmann |
|
700 | d9c02ca6 | Michael Hanselmann | """
|
701 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
702 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.name) |
703 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.ShortName()) |
704 | d9c02ca6 | Michael Hanselmann | |
705 | d9c02ca6 | Michael Hanselmann | |
706 | a8083063 | Iustin Pop | def CreateBackup(file_name): |
707 | a8083063 | Iustin Pop | """Creates a backup of a file.
|
708 | a8083063 | Iustin Pop |
|
709 | a8083063 | Iustin Pop | Returns: the path to the newly created backup file.
|
710 | a8083063 | Iustin Pop |
|
711 | a8083063 | Iustin Pop | """
|
712 | a8083063 | Iustin Pop | if not os.path.isfile(file_name): |
713 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Can't make a backup of a non-file '%s'" % |
714 | 3ecf6786 | Iustin Pop | file_name) |
715 | a8083063 | Iustin Pop | |
716 | 081b1e69 | Michael Hanselmann | prefix = '%s.backup-%d.' % (os.path.basename(file_name), int(time.time())) |
717 | 65fe4693 | Iustin Pop | dir_name = os.path.dirname(file_name) |
718 | 081b1e69 | Michael Hanselmann | |
719 | 081b1e69 | Michael Hanselmann | fsrc = open(file_name, 'rb') |
720 | 081b1e69 | Michael Hanselmann | try:
|
721 | 65fe4693 | Iustin Pop | (fd, backup_name) = tempfile.mkstemp(prefix=prefix, dir=dir_name) |
722 | 081b1e69 | Michael Hanselmann | fdst = os.fdopen(fd, 'wb')
|
723 | 081b1e69 | Michael Hanselmann | try:
|
724 | 081b1e69 | Michael Hanselmann | shutil.copyfileobj(fsrc, fdst) |
725 | 081b1e69 | Michael Hanselmann | finally:
|
726 | 081b1e69 | Michael Hanselmann | fdst.close() |
727 | 081b1e69 | Michael Hanselmann | finally:
|
728 | 081b1e69 | Michael Hanselmann | fsrc.close() |
729 | 081b1e69 | Michael Hanselmann | |
730 | a8083063 | Iustin Pop | return backup_name
|
731 | a8083063 | Iustin Pop | |
732 | a8083063 | Iustin Pop | |
733 | a8083063 | Iustin Pop | def ShellQuote(value): |
734 | a8083063 | Iustin Pop | """Quotes shell argument according to POSIX.
|
735 | 3ecf6786 | Iustin Pop |
|
736 | a8083063 | Iustin Pop | """
|
737 | a8083063 | Iustin Pop | if _re_shell_unquoted.match(value):
|
738 | a8083063 | Iustin Pop | return value
|
739 | a8083063 | Iustin Pop | else:
|
740 | a8083063 | Iustin Pop | return "'%s'" % value.replace("'", "'\\''") |
741 | a8083063 | Iustin Pop | |
742 | a8083063 | Iustin Pop | |
743 | a8083063 | Iustin Pop | def ShellQuoteArgs(args): |
744 | a8083063 | Iustin Pop | """Quotes all given shell arguments and concatenates using spaces.
|
745 | a8083063 | Iustin Pop |
|
746 | a8083063 | Iustin Pop | """
|
747 | a8083063 | Iustin Pop | return ' '.join([ShellQuote(i) for i in args]) |
748 | 88d14415 | Michael Hanselmann | |
749 | 88d14415 | Michael Hanselmann | |
750 | b15d625f | Iustin Pop | def TcpPing(target, port, timeout=10, live_port_needed=False, source=None): |
751 | 2c30e9d7 | Alexander Schreiber | """Simple ping implementation using TCP connect(2).
|
752 | 2c30e9d7 | Alexander Schreiber |
|
753 | b15d625f | Iustin Pop | Try to do a TCP connect(2) from an optional source IP to the
|
754 | b15d625f | Iustin Pop | specified target IP and the specified target port. If the optional
|
755 | b15d625f | Iustin Pop | parameter live_port_needed is set to true, requires the remote end
|
756 | b15d625f | Iustin Pop | to accept the connection. The timeout is specified in seconds and
|
757 | b15d625f | Iustin Pop | defaults to 10 seconds. If the source optional argument is not
|
758 | b15d625f | Iustin Pop | passed, the source address selection is left to the kernel,
|
759 | b15d625f | Iustin Pop | otherwise we try to connect using the passed address (failures to
|
760 | b15d625f | Iustin Pop | bind other than EADDRNOTAVAIL will be ignored).
|
761 | 2c30e9d7 | Alexander Schreiber |
|
762 | 2c30e9d7 | Alexander Schreiber | """
|
763 | 2c30e9d7 | Alexander Schreiber | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
764 | 2c30e9d7 | Alexander Schreiber | |
765 | 2c30e9d7 | Alexander Schreiber | sucess = False
|
766 | 2c30e9d7 | Alexander Schreiber | |
767 | b15d625f | Iustin Pop | if source is not None: |
768 | b15d625f | Iustin Pop | try:
|
769 | b15d625f | Iustin Pop | sock.bind((source, 0))
|
770 | b15d625f | Iustin Pop | except socket.error, (errcode, errstring):
|
771 | b15d625f | Iustin Pop | if errcode == errno.EADDRNOTAVAIL:
|
772 | b15d625f | Iustin Pop | success = False
|
773 | 2c30e9d7 | Alexander Schreiber | |
774 | 2c30e9d7 | Alexander Schreiber | sock.settimeout(timeout) |
775 | 2c30e9d7 | Alexander Schreiber | |
776 | 2c30e9d7 | Alexander Schreiber | try:
|
777 | 2c30e9d7 | Alexander Schreiber | sock.connect((target, port)) |
778 | 2c30e9d7 | Alexander Schreiber | sock.close() |
779 | 2c30e9d7 | Alexander Schreiber | success = True
|
780 | 2c30e9d7 | Alexander Schreiber | except socket.timeout:
|
781 | 2c30e9d7 | Alexander Schreiber | success = False
|
782 | 2c30e9d7 | Alexander Schreiber | except socket.error, (errcode, errstring):
|
783 | 4ca1b175 | Alexander Schreiber | success = (not live_port_needed) and (errcode == errno.ECONNREFUSED) |
784 | 2c30e9d7 | Alexander Schreiber | |
785 | 2c30e9d7 | Alexander Schreiber | return success
|
786 | eedbda4b | Michael Hanselmann | |
787 | eedbda4b | Michael Hanselmann | |
788 | eedbda4b | Michael Hanselmann | def ListVisibleFiles(path): |
789 | eedbda4b | Michael Hanselmann | """Returns a list of all visible files in a directory.
|
790 | eedbda4b | Michael Hanselmann |
|
791 | eedbda4b | Michael Hanselmann | """
|
792 | f3299a07 | Michael Hanselmann | files = [i for i in os.listdir(path) if not i.startswith(".")] |
793 | f3299a07 | Michael Hanselmann | files.sort() |
794 | f3299a07 | Michael Hanselmann | return files
|
795 | 2f8b60b3 | Iustin Pop | |
796 | 2f8b60b3 | Iustin Pop | |
797 | 257f4c0a | Iustin Pop | def GetHomeDir(user, default=None): |
798 | 257f4c0a | Iustin Pop | """Try to get the homedir of the given user.
|
799 | 257f4c0a | Iustin Pop |
|
800 | 257f4c0a | Iustin Pop | The user can be passed either as a string (denoting the name) or as
|
801 | 257f4c0a | Iustin Pop | an integer (denoting the user id). If the user is not found, the
|
802 | 257f4c0a | Iustin Pop | 'default' argument is returned, which defaults to None.
|
803 | 2f8b60b3 | Iustin Pop |
|
804 | 2f8b60b3 | Iustin Pop | """
|
805 | 2f8b60b3 | Iustin Pop | try:
|
806 | 257f4c0a | Iustin Pop | if isinstance(user, basestring): |
807 | 257f4c0a | Iustin Pop | result = pwd.getpwnam(user) |
808 | 257f4c0a | Iustin Pop | elif isinstance(user, (int, long)): |
809 | 257f4c0a | Iustin Pop | result = pwd.getpwuid(user) |
810 | 257f4c0a | Iustin Pop | else:
|
811 | 257f4c0a | Iustin Pop | raise errors.ProgrammerError("Invalid type passed to GetHomeDir (%s)" % |
812 | 257f4c0a | Iustin Pop | type(user))
|
813 | 2f8b60b3 | Iustin Pop | except KeyError: |
814 | 2f8b60b3 | Iustin Pop | return default
|
815 | 2f8b60b3 | Iustin Pop | return result.pw_dir
|
816 | 59072e7e | Michael Hanselmann | |
817 | 59072e7e | Michael Hanselmann | |
818 | 24818e8f | Michael Hanselmann | def NewUUID(): |
819 | 59072e7e | Michael Hanselmann | """Returns a random UUID.
|
820 | 59072e7e | Michael Hanselmann |
|
821 | 59072e7e | Michael Hanselmann | """
|
822 | 59072e7e | Michael Hanselmann | f = open("/proc/sys/kernel/random/uuid", "r") |
823 | 59072e7e | Michael Hanselmann | try:
|
824 | 59072e7e | Michael Hanselmann | return f.read(128).rstrip("\n") |
825 | 59072e7e | Michael Hanselmann | finally:
|
826 | 59072e7e | Michael Hanselmann | f.close() |
827 | 087b34fe | Iustin Pop | |
828 | 087b34fe | Iustin Pop | |
829 | 087b34fe | Iustin Pop | def WriteFile(file_name, fn=None, data=None, |
830 | 087b34fe | Iustin Pop | mode=None, uid=-1, gid=-1, |
831 | 71714516 | Michael Hanselmann | atime=None, mtime=None, close=True, |
832 | 04a8d789 | Michael Hanselmann | dry_run=False, backup=False, |
833 | 71714516 | Michael Hanselmann | prewrite=None, postwrite=None): |
834 | 087b34fe | Iustin Pop | """(Over)write a file atomically.
|
835 | 087b34fe | Iustin Pop |
|
836 | 087b34fe | Iustin Pop | The file_name and either fn (a function taking one argument, the
|
837 | 087b34fe | Iustin Pop | file descriptor, and which should write the data to it) or data (the
|
838 | 087b34fe | Iustin Pop | contents of the file) must be passed. The other arguments are
|
839 | 087b34fe | Iustin Pop | optional and allow setting the file mode, owner and group, and the
|
840 | 087b34fe | Iustin Pop | mtime/atime of the file.
|
841 | 087b34fe | Iustin Pop |
|
842 | 087b34fe | Iustin Pop | If the function doesn't raise an exception, it has succeeded and the
|
843 | 087b34fe | Iustin Pop | target file has the new contents. If the file has raised an
|
844 | 087b34fe | Iustin Pop | exception, an existing target file should be unmodified and the
|
845 | 087b34fe | Iustin Pop | temporary file should be removed.
|
846 | 087b34fe | Iustin Pop |
|
847 | 71714516 | Michael Hanselmann | Args:
|
848 | 71714516 | Michael Hanselmann | file_name: New filename
|
849 | 71714516 | Michael Hanselmann | fn: Content writing function, called with file descriptor as parameter
|
850 | 71714516 | Michael Hanselmann | data: Content as string
|
851 | 71714516 | Michael Hanselmann | mode: File mode
|
852 | 71714516 | Michael Hanselmann | uid: Owner
|
853 | 71714516 | Michael Hanselmann | gid: Group
|
854 | 71714516 | Michael Hanselmann | atime: Access time
|
855 | 71714516 | Michael Hanselmann | mtime: Modification time
|
856 | 71714516 | Michael Hanselmann | close: Whether to close file after writing it
|
857 | 71714516 | Michael Hanselmann | prewrite: Function object called before writing content
|
858 | 71714516 | Michael Hanselmann | postwrite: Function object called after writing content
|
859 | 71714516 | Michael Hanselmann |
|
860 | 71714516 | Michael Hanselmann | Returns:
|
861 | 71714516 | Michael Hanselmann | None if "close" parameter evaluates to True, otherwise file descriptor.
|
862 | 71714516 | Michael Hanselmann |
|
863 | 087b34fe | Iustin Pop | """
|
864 | 04a8d789 | Michael Hanselmann | if not os.path.isabs(file_name): |
865 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Path passed to WriteFile is not" |
866 | 087b34fe | Iustin Pop | " absolute: '%s'" % file_name)
|
867 | 087b34fe | Iustin Pop | |
868 | 087b34fe | Iustin Pop | if [fn, data].count(None) != 1: |
869 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("fn or data required") |
870 | 087b34fe | Iustin Pop | |
871 | 087b34fe | Iustin Pop | if [atime, mtime].count(None) == 1: |
872 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Both atime and mtime must be either" |
873 | 087b34fe | Iustin Pop | " set or None")
|
874 | 087b34fe | Iustin Pop | |
875 | 70f4497c | Michael Hanselmann | if backup and not dry_run and os.path.isfile(file_name): |
876 | 70f4497c | Michael Hanselmann | CreateBackup(file_name) |
877 | 087b34fe | Iustin Pop | |
878 | 087b34fe | Iustin Pop | dir_name, base_name = os.path.split(file_name) |
879 | 087b34fe | Iustin Pop | fd, new_name = tempfile.mkstemp('.new', base_name, dir_name)
|
880 | 087b34fe | Iustin Pop | # here we need to make sure we remove the temp file, if any error
|
881 | 087b34fe | Iustin Pop | # leaves it in place
|
882 | 087b34fe | Iustin Pop | try:
|
883 | 087b34fe | Iustin Pop | if uid != -1 or gid != -1: |
884 | 087b34fe | Iustin Pop | os.chown(new_name, uid, gid) |
885 | 087b34fe | Iustin Pop | if mode:
|
886 | 087b34fe | Iustin Pop | os.chmod(new_name, mode) |
887 | 71714516 | Michael Hanselmann | if callable(prewrite): |
888 | 71714516 | Michael Hanselmann | prewrite(fd) |
889 | 087b34fe | Iustin Pop | if data is not None: |
890 | 087b34fe | Iustin Pop | os.write(fd, data) |
891 | 087b34fe | Iustin Pop | else:
|
892 | 087b34fe | Iustin Pop | fn(fd) |
893 | 71714516 | Michael Hanselmann | if callable(postwrite): |
894 | 71714516 | Michael Hanselmann | postwrite(fd) |
895 | 087b34fe | Iustin Pop | os.fsync(fd) |
896 | 087b34fe | Iustin Pop | if atime is not None and mtime is not None: |
897 | 087b34fe | Iustin Pop | os.utime(new_name, (atime, mtime)) |
898 | 70f4497c | Michael Hanselmann | if not dry_run: |
899 | 70f4497c | Michael Hanselmann | os.rename(new_name, file_name) |
900 | 087b34fe | Iustin Pop | finally:
|
901 | 71714516 | Michael Hanselmann | if close:
|
902 | 71714516 | Michael Hanselmann | os.close(fd) |
903 | 71714516 | Michael Hanselmann | result = None
|
904 | 71714516 | Michael Hanselmann | else:
|
905 | 71714516 | Michael Hanselmann | result = fd |
906 | 087b34fe | Iustin Pop | RemoveFile(new_name) |
907 | 78feb6fb | Guido Trotter | |
908 | 71714516 | Michael Hanselmann | return result
|
909 | 71714516 | Michael Hanselmann | |
910 | 78feb6fb | Guido Trotter | |
911 | 7b4126b7 | Iustin Pop | def FirstFree(seq, base=0): |
912 | 7b4126b7 | Iustin Pop | """Returns the first non-existing integer from seq.
|
913 | 7b4126b7 | Iustin Pop |
|
914 | 7b4126b7 | Iustin Pop | The seq argument should be a sorted list of positive integers. The
|
915 | 7b4126b7 | Iustin Pop | first time the index of an element is smaller than the element
|
916 | 7b4126b7 | Iustin Pop | value, the index will be returned.
|
917 | 7b4126b7 | Iustin Pop |
|
918 | 7b4126b7 | Iustin Pop | The base argument is used to start at a different offset,
|
919 | 7b4126b7 | Iustin Pop | i.e. [3, 4, 6] with offset=3 will return 5.
|
920 | 7b4126b7 | Iustin Pop |
|
921 | 7b4126b7 | Iustin Pop | Example: [0, 1, 3] will return 2.
|
922 | 7b4126b7 | Iustin Pop |
|
923 | 7b4126b7 | Iustin Pop | """
|
924 | 7b4126b7 | Iustin Pop | for idx, elem in enumerate(seq): |
925 | 7b4126b7 | Iustin Pop | assert elem >= base, "Passed element is higher than base offset" |
926 | 7b4126b7 | Iustin Pop | if elem > idx + base:
|
927 | 7b4126b7 | Iustin Pop | # idx is not used
|
928 | 7b4126b7 | Iustin Pop | return idx + base
|
929 | 7b4126b7 | Iustin Pop | return None |
930 | 7b4126b7 | Iustin Pop | |
931 | 7b4126b7 | Iustin Pop | |
932 | 78feb6fb | Guido Trotter | def all(seq, pred=bool): |
933 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for every element in the iterable"
|
934 | 78feb6fb | Guido Trotter | for elem in itertools.ifilterfalse(pred, seq): |
935 | 78feb6fb | Guido Trotter | return False |
936 | 78feb6fb | Guido Trotter | return True |
937 | 78feb6fb | Guido Trotter | |
938 | 78feb6fb | Guido Trotter | |
939 | 78feb6fb | Guido Trotter | def any(seq, pred=bool): |
940 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for at least one element in the iterable"
|
941 | 78feb6fb | Guido Trotter | for elem in itertools.ifilter(pred, seq): |
942 | 78feb6fb | Guido Trotter | return True |
943 | 78feb6fb | Guido Trotter | return False |
944 | f7414041 | Michael Hanselmann | |
945 | f7414041 | Michael Hanselmann | |
946 | f7414041 | Michael Hanselmann | def UniqueSequence(seq): |
947 | f7414041 | Michael Hanselmann | """Returns a list with unique elements.
|
948 | f7414041 | Michael Hanselmann |
|
949 | f7414041 | Michael Hanselmann | Element order is preserved.
|
950 | f7414041 | Michael Hanselmann | """
|
951 | f7414041 | Michael Hanselmann | seen = set()
|
952 | f7414041 | Michael Hanselmann | return [i for i in seq if i not in seen and not seen.add(i)] |
953 | 1862d460 | Alexander Schreiber | |
954 | 1862d460 | Alexander Schreiber | |
955 | 1862d460 | Alexander Schreiber | def IsValidMac(mac): |
956 | 1862d460 | Alexander Schreiber | """Predicate to check if a MAC address is valid.
|
957 | 1862d460 | Alexander Schreiber |
|
958 | 1862d460 | Alexander Schreiber | Checks wether the supplied MAC address is formally correct, only
|
959 | 1862d460 | Alexander Schreiber | accepts colon separated format.
|
960 | 1862d460 | Alexander Schreiber | """
|
961 | 1862d460 | Alexander Schreiber | mac_check = re.compile("^([0-9a-f]{2}(:|$)){6}$")
|
962 | 1862d460 | Alexander Schreiber | return mac_check.match(mac) is not None |
963 | 06009e27 | Iustin Pop | |
964 | 06009e27 | Iustin Pop | |
965 | 06009e27 | Iustin Pop | def TestDelay(duration): |
966 | 06009e27 | Iustin Pop | """Sleep for a fixed amount of time.
|
967 | 06009e27 | Iustin Pop |
|
968 | 06009e27 | Iustin Pop | """
|
969 | 06009e27 | Iustin Pop | if duration < 0: |
970 | 06009e27 | Iustin Pop | return False |
971 | 06009e27 | Iustin Pop | time.sleep(duration) |
972 | 06009e27 | Iustin Pop | return True |
973 | 8f765069 | Iustin Pop | |
974 | 8f765069 | Iustin Pop | |
975 | 8ff612c2 | Iustin Pop | def Daemonize(logfile, noclose_fds=None): |
976 | 8f765069 | Iustin Pop | """Daemonize the current process.
|
977 | 8f765069 | Iustin Pop |
|
978 | 8f765069 | Iustin Pop | This detaches the current process from the controlling terminal and
|
979 | 8f765069 | Iustin Pop | runs it in the background as a daemon.
|
980 | 8f765069 | Iustin Pop |
|
981 | 8f765069 | Iustin Pop | """
|
982 | 8f765069 | Iustin Pop | UMASK = 077
|
983 | 8f765069 | Iustin Pop | WORKDIR = "/"
|
984 | 8f765069 | Iustin Pop | # Default maximum for the number of available file descriptors.
|
985 | 8f765069 | Iustin Pop | if 'SC_OPEN_MAX' in os.sysconf_names: |
986 | 8f765069 | Iustin Pop | try:
|
987 | 8f765069 | Iustin Pop | MAXFD = os.sysconf('SC_OPEN_MAX')
|
988 | 8f765069 | Iustin Pop | if MAXFD < 0: |
989 | 8f765069 | Iustin Pop | MAXFD = 1024
|
990 | 8f765069 | Iustin Pop | except OSError: |
991 | 8f765069 | Iustin Pop | MAXFD = 1024
|
992 | 8f765069 | Iustin Pop | else:
|
993 | 8f765069 | Iustin Pop | MAXFD = 1024
|
994 | 8f765069 | Iustin Pop | |
995 | 8f765069 | Iustin Pop | # this might fail
|
996 | 8f765069 | Iustin Pop | pid = os.fork() |
997 | 8f765069 | Iustin Pop | if (pid == 0): # The first child. |
998 | 8f765069 | Iustin Pop | os.setsid() |
999 | 8f765069 | Iustin Pop | # this might fail
|
1000 | 8f765069 | Iustin Pop | pid = os.fork() # Fork a second child.
|
1001 | 8f765069 | Iustin Pop | if (pid == 0): # The second child. |
1002 | 8f765069 | Iustin Pop | os.chdir(WORKDIR) |
1003 | 8f765069 | Iustin Pop | os.umask(UMASK) |
1004 | 8f765069 | Iustin Pop | else:
|
1005 | 8f765069 | Iustin Pop | # exit() or _exit()? See below.
|
1006 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent (the first child) of the second child. |
1007 | 8f765069 | Iustin Pop | else:
|
1008 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent of the first child. |
1009 | 8f765069 | Iustin Pop | maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
|
1010 | 8f765069 | Iustin Pop | if (maxfd == resource.RLIM_INFINITY):
|
1011 | 8f765069 | Iustin Pop | maxfd = MAXFD |
1012 | 8f765069 | Iustin Pop | |
1013 | 8f765069 | Iustin Pop | # Iterate through and close all file descriptors.
|
1014 | 8f765069 | Iustin Pop | for fd in range(0, maxfd): |
1015 | 8ff612c2 | Iustin Pop | if noclose_fds and fd in noclose_fds: |
1016 | 8ff612c2 | Iustin Pop | continue
|
1017 | 8f765069 | Iustin Pop | try:
|
1018 | 8f765069 | Iustin Pop | os.close(fd) |
1019 | 8f765069 | Iustin Pop | except OSError: # ERROR, fd wasn't open to begin with (ignored) |
1020 | 8f765069 | Iustin Pop | pass
|
1021 | 8f765069 | Iustin Pop | os.open(logfile, os.O_RDWR|os.O_CREAT|os.O_APPEND, 0600)
|
1022 | 8f765069 | Iustin Pop | # Duplicate standard input to standard output and standard error.
|
1023 | 8f765069 | Iustin Pop | os.dup2(0, 1) # standard output (1) |
1024 | 8f765069 | Iustin Pop | os.dup2(0, 2) # standard error (2) |
1025 | 8f765069 | Iustin Pop | return 0 |
1026 | 57c177af | Iustin Pop | |
1027 | 57c177af | Iustin Pop | |
1028 | 57c177af | Iustin Pop | def FindFile(name, search_path, test=os.path.exists): |
1029 | 57c177af | Iustin Pop | """Look for a filesystem object in a given path.
|
1030 | 57c177af | Iustin Pop |
|
1031 | 57c177af | Iustin Pop | This is an abstract method to search for filesystem object (files,
|
1032 | 57c177af | Iustin Pop | dirs) under a given search path.
|
1033 | 57c177af | Iustin Pop |
|
1034 | 57c177af | Iustin Pop | Args:
|
1035 | 57c177af | Iustin Pop | - name: the name to look for
|
1036 | 57c177af | Iustin Pop | - search_path: list of directory names
|
1037 | 57c177af | Iustin Pop | - test: the test which the full path must satisfy
|
1038 | 57c177af | Iustin Pop | (defaults to os.path.exists)
|
1039 | 57c177af | Iustin Pop |
|
1040 | 57c177af | Iustin Pop | Returns:
|
1041 | 57c177af | Iustin Pop | - full path to the item if found
|
1042 | 57c177af | Iustin Pop | - None otherwise
|
1043 | 57c177af | Iustin Pop |
|
1044 | 57c177af | Iustin Pop | """
|
1045 | 57c177af | Iustin Pop | for dir_name in search_path: |
1046 | 57c177af | Iustin Pop | item_name = os.path.sep.join([dir_name, name]) |
1047 | 57c177af | Iustin Pop | if test(item_name):
|
1048 | 57c177af | Iustin Pop | return item_name
|
1049 | 57c177af | Iustin Pop | return None |
1050 | 8d1a2a64 | Michael Hanselmann | |
1051 | 8d1a2a64 | Michael Hanselmann | |
1052 | 8d1a2a64 | Michael Hanselmann | def CheckVolumeGroupSize(vglist, vgname, minsize): |
1053 | 8d1a2a64 | Michael Hanselmann | """Checks if the volume group list is valid.
|
1054 | 8d1a2a64 | Michael Hanselmann |
|
1055 | 8d1a2a64 | Michael Hanselmann | A non-None return value means there's an error, and the return value
|
1056 | 8d1a2a64 | Michael Hanselmann | is the error message.
|
1057 | 8d1a2a64 | Michael Hanselmann |
|
1058 | 8d1a2a64 | Michael Hanselmann | """
|
1059 | 8d1a2a64 | Michael Hanselmann | vgsize = vglist.get(vgname, None)
|
1060 | 8d1a2a64 | Michael Hanselmann | if vgsize is None: |
1061 | 8d1a2a64 | Michael Hanselmann | return "volume group '%s' missing" % vgname |
1062 | 8d1a2a64 | Michael Hanselmann | elif vgsize < minsize:
|
1063 | 8d1a2a64 | Michael Hanselmann | return ("volume group '%s' too small (%s MiB required, %d MiB found)" % |
1064 | 8d1a2a64 | Michael Hanselmann | (vgname, minsize, vgsize)) |
1065 | 8d1a2a64 | Michael Hanselmann | return None |
1066 | 7996a135 | Iustin Pop | |
1067 | 7996a135 | Iustin Pop | |
1068 | 7996a135 | Iustin Pop | def LockedMethod(fn): |
1069 | 7996a135 | Iustin Pop | """Synchronized object access decorator.
|
1070 | 7996a135 | Iustin Pop |
|
1071 | 7996a135 | Iustin Pop | This decorator is intended to protect access to an object using the
|
1072 | 7996a135 | Iustin Pop | object's own lock which is hardcoded to '_lock'.
|
1073 | 7996a135 | Iustin Pop |
|
1074 | 7996a135 | Iustin Pop | """
|
1075 | 7996a135 | Iustin Pop | def wrapper(self, *args, **kwargs): |
1076 | 7996a135 | Iustin Pop | assert hasattr(self, '_lock') |
1077 | 7996a135 | Iustin Pop | lock = self._lock
|
1078 | 7996a135 | Iustin Pop | lock.acquire() |
1079 | 7996a135 | Iustin Pop | try:
|
1080 | 7996a135 | Iustin Pop | result = fn(self, *args, **kwargs)
|
1081 | 7996a135 | Iustin Pop | finally:
|
1082 | 7996a135 | Iustin Pop | lock.release() |
1083 | 7996a135 | Iustin Pop | return result
|
1084 | 7996a135 | Iustin Pop | return wrapper
|
1085 | eb0f0ce0 | Michael Hanselmann | |
1086 | eb0f0ce0 | Michael Hanselmann | |
1087 | eb0f0ce0 | Michael Hanselmann | def LockFile(fd): |
1088 | eb0f0ce0 | Michael Hanselmann | """Locks a file using POSIX locks.
|
1089 | eb0f0ce0 | Michael Hanselmann |
|
1090 | eb0f0ce0 | Michael Hanselmann | """
|
1091 | eb0f0ce0 | Michael Hanselmann | try:
|
1092 | eb0f0ce0 | Michael Hanselmann | fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) |
1093 | eb0f0ce0 | Michael Hanselmann | except IOError, err: |
1094 | eb0f0ce0 | Michael Hanselmann | if err.errno == errno.EAGAIN:
|
1095 | eb0f0ce0 | Michael Hanselmann | raise errors.LockError("File already locked") |
1096 | eb0f0ce0 | Michael Hanselmann | raise |