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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 | de499029 | Michael Hanselmann | import signal |
44 | 9c233417 | Iustin Pop | |
45 | 9c233417 | Iustin Pop | from cStringIO import StringIO |
46 | a8083063 | Iustin Pop | |
47 | a8083063 | Iustin Pop | from ganeti import errors |
48 | 3aecd2c7 | Iustin Pop | from ganeti import constants |
49 | a8083063 | Iustin Pop | |
50 | 16abfbc2 | Alexander Schreiber | |
51 | a8083063 | Iustin Pop | _locksheld = [] |
52 | a8083063 | Iustin Pop | _re_shell_unquoted = re.compile('^[-.,=:/_+@A-Za-z0-9]+$')
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53 | a8083063 | Iustin Pop | |
54 | f362096f | Iustin Pop | debug = False
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55 | b74159ee | Iustin Pop | no_fork = False
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56 | f362096f | Iustin Pop | |
57 | 7c0d6283 | Michael Hanselmann | |
58 | a8083063 | Iustin Pop | class RunResult(object): |
59 | a8083063 | Iustin Pop | """Simple class for holding the result of running external programs.
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60 | a8083063 | Iustin Pop |
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61 | a8083063 | Iustin Pop | Instance variables:
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62 | a8083063 | Iustin Pop | exit_code: the exit code of the program, or None (if the program
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63 | a8083063 | Iustin Pop | didn't exit())
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64 | a8083063 | Iustin Pop | signal: numeric signal that caused the program to finish, or None
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65 | a8083063 | Iustin Pop | (if the program wasn't terminated by a signal)
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66 | a8083063 | Iustin Pop | stdout: the standard output of the program
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67 | a8083063 | Iustin Pop | stderr: the standard error of the program
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68 | a8083063 | Iustin Pop | failed: a Boolean value which is True in case the program was
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69 | a8083063 | Iustin Pop | terminated by a signal or exited with a non-zero exit code
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70 | a8083063 | Iustin Pop | fail_reason: a string detailing the termination reason
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71 | a8083063 | Iustin Pop |
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72 | a8083063 | Iustin Pop | """
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73 | a8083063 | Iustin Pop | __slots__ = ["exit_code", "signal", "stdout", "stderr", |
74 | a8083063 | Iustin Pop | "failed", "fail_reason", "cmd"] |
75 | a8083063 | Iustin Pop | |
76 | a8083063 | Iustin Pop | |
77 | a8083063 | Iustin Pop | def __init__(self, exit_code, signal, stdout, stderr, cmd): |
78 | a8083063 | Iustin Pop | self.cmd = cmd
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79 | a8083063 | Iustin Pop | self.exit_code = exit_code
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80 | a8083063 | Iustin Pop | self.signal = signal
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81 | a8083063 | Iustin Pop | self.stdout = stdout
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82 | a8083063 | Iustin Pop | self.stderr = stderr
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83 | a8083063 | Iustin Pop | self.failed = (signal is not None or exit_code != 0) |
84 | a8083063 | Iustin Pop | |
85 | a8083063 | Iustin Pop | if self.signal is not None: |
86 | a8083063 | Iustin Pop | self.fail_reason = "terminated by signal %s" % self.signal |
87 | a8083063 | Iustin Pop | elif self.exit_code is not None: |
88 | a8083063 | Iustin Pop | self.fail_reason = "exited with exit code %s" % self.exit_code |
89 | a8083063 | Iustin Pop | else:
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90 | a8083063 | Iustin Pop | self.fail_reason = "unable to determine termination reason" |
91 | a8083063 | Iustin Pop | |
92 | bb698c1f | Iustin Pop | if self.failed: |
93 | bb698c1f | Iustin Pop | logging.debug("Command '%s' failed (%s); output: %s",
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94 | bb698c1f | Iustin Pop | self.cmd, self.fail_reason, self.output) |
95 | f362096f | Iustin Pop | |
96 | a8083063 | Iustin Pop | def _GetOutput(self): |
97 | a8083063 | Iustin Pop | """Returns the combined stdout and stderr for easier usage.
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98 | a8083063 | Iustin Pop |
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99 | a8083063 | Iustin Pop | """
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100 | a8083063 | Iustin Pop | return self.stdout + self.stderr |
101 | a8083063 | Iustin Pop | |
102 | a8083063 | Iustin Pop | output = property(_GetOutput, None, None, "Return full output") |
103 | a8083063 | Iustin Pop | |
104 | a8083063 | Iustin Pop | |
105 | a8083063 | Iustin Pop | def RunCmd(cmd): |
106 | a8083063 | Iustin Pop | """Execute a (shell) command.
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107 | a8083063 | Iustin Pop |
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108 | a8083063 | Iustin Pop | The command should not read from its standard input, as it will be
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109 | a8083063 | Iustin Pop | closed.
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110 | a8083063 | Iustin Pop |
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111 | a8083063 | Iustin Pop | Args:
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112 | a8083063 | Iustin Pop | cmd: command to run. (str)
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113 | a8083063 | Iustin Pop |
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114 | a8083063 | Iustin Pop | Returns: `RunResult` instance
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115 | a8083063 | Iustin Pop |
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116 | a8083063 | Iustin Pop | """
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117 | b74159ee | Iustin Pop | if no_fork:
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118 | b74159ee | Iustin Pop | raise errors.ProgrammerError("utils.RunCmd() called with fork() disabled") |
119 | b74159ee | Iustin Pop | |
120 | a8083063 | Iustin Pop | if isinstance(cmd, list): |
121 | a8083063 | Iustin Pop | cmd = [str(val) for val in cmd] |
122 | 113b55aa | Iustin Pop | strcmd = " ".join(cmd)
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123 | 113b55aa | Iustin Pop | shell = False
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124 | 113b55aa | Iustin Pop | else:
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125 | 113b55aa | Iustin Pop | strcmd = cmd |
126 | 113b55aa | Iustin Pop | shell = True
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127 | bb698c1f | Iustin Pop | logging.debug("RunCmd '%s'", strcmd)
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128 | 23f41a3e | Michael Hanselmann | env = os.environ.copy() |
129 | 23f41a3e | Michael Hanselmann | env["LC_ALL"] = "C" |
130 | 9c233417 | Iustin Pop | poller = select.poll() |
131 | 113b55aa | Iustin Pop | child = subprocess.Popen(cmd, shell=shell, |
132 | 113b55aa | Iustin Pop | stderr=subprocess.PIPE, |
133 | 113b55aa | Iustin Pop | stdout=subprocess.PIPE, |
134 | 113b55aa | Iustin Pop | stdin=subprocess.PIPE, |
135 | 23f41a3e | Michael Hanselmann | close_fds=True, env=env)
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136 | 113b55aa | Iustin Pop | |
137 | 113b55aa | Iustin Pop | child.stdin.close() |
138 | 9c233417 | Iustin Pop | poller.register(child.stdout, select.POLLIN) |
139 | 9c233417 | Iustin Pop | poller.register(child.stderr, select.POLLIN) |
140 | 9c233417 | Iustin Pop | out = StringIO() |
141 | 9c233417 | Iustin Pop | err = StringIO() |
142 | 9c233417 | Iustin Pop | fdmap = { |
143 | 9c233417 | Iustin Pop | child.stdout.fileno(): (out, child.stdout), |
144 | 9c233417 | Iustin Pop | child.stderr.fileno(): (err, child.stderr), |
145 | 9c233417 | Iustin Pop | } |
146 | 9c233417 | Iustin Pop | for fd in fdmap: |
147 | 9c233417 | Iustin Pop | status = fcntl.fcntl(fd, fcntl.F_GETFL) |
148 | 9c233417 | Iustin Pop | fcntl.fcntl(fd, fcntl.F_SETFL, status | os.O_NONBLOCK) |
149 | 9c233417 | Iustin Pop | |
150 | 9c233417 | Iustin Pop | while fdmap:
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151 | 9c233417 | Iustin Pop | for fd, event in poller.poll(): |
152 | 9c233417 | Iustin Pop | if event & select.POLLIN or event & select.POLLPRI: |
153 | 9c233417 | Iustin Pop | data = fdmap[fd][1].read()
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154 | 9c233417 | Iustin Pop | # no data from read signifies EOF (the same as POLLHUP)
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155 | 9c233417 | Iustin Pop | if not data: |
156 | 9c233417 | Iustin Pop | poller.unregister(fd) |
157 | 9c233417 | Iustin Pop | del fdmap[fd]
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158 | 9c233417 | Iustin Pop | continue
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159 | 9c233417 | Iustin Pop | fdmap[fd][0].write(data)
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160 | 9c233417 | Iustin Pop | if (event & select.POLLNVAL or event & select.POLLHUP or |
161 | 9c233417 | Iustin Pop | event & select.POLLERR): |
162 | 9c233417 | Iustin Pop | poller.unregister(fd) |
163 | 9c233417 | Iustin Pop | del fdmap[fd]
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164 | 9c233417 | Iustin Pop | |
165 | 9c233417 | Iustin Pop | out = out.getvalue() |
166 | 9c233417 | Iustin Pop | err = err.getvalue() |
167 | a8083063 | Iustin Pop | |
168 | a8083063 | Iustin Pop | status = child.wait() |
169 | 113b55aa | Iustin Pop | if status >= 0: |
170 | 113b55aa | Iustin Pop | exitcode = status |
171 | a8083063 | Iustin Pop | signal = None
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172 | a8083063 | Iustin Pop | else:
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173 | a8083063 | Iustin Pop | exitcode = None
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174 | 113b55aa | Iustin Pop | signal = -status |
175 | a8083063 | Iustin Pop | |
176 | a8083063 | Iustin Pop | return RunResult(exitcode, signal, out, err, strcmd)
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177 | a8083063 | Iustin Pop | |
178 | a8083063 | Iustin Pop | |
179 | a8083063 | Iustin Pop | def RemoveFile(filename): |
180 | a8083063 | Iustin Pop | """Remove a file ignoring some errors.
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181 | a8083063 | Iustin Pop |
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182 | a8083063 | Iustin Pop | Remove a file, ignoring non-existing ones or directories. Other
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183 | a8083063 | Iustin Pop | errors are passed.
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184 | a8083063 | Iustin Pop |
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185 | a8083063 | Iustin Pop | """
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186 | a8083063 | Iustin Pop | try:
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187 | a8083063 | Iustin Pop | os.unlink(filename) |
188 | a8083063 | Iustin Pop | except OSError, err: |
189 | 4ca1b175 | Alexander Schreiber | if err.errno not in (errno.ENOENT, errno.EISDIR): |
190 | a8083063 | Iustin Pop | raise
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191 | a8083063 | Iustin Pop | |
192 | a8083063 | Iustin Pop | |
193 | a8083063 | Iustin Pop | def _FingerprintFile(filename): |
194 | a8083063 | Iustin Pop | """Compute the fingerprint of a file.
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195 | a8083063 | Iustin Pop |
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196 | a8083063 | Iustin Pop | If the file does not exist, a None will be returned
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197 | a8083063 | Iustin Pop | instead.
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198 | a8083063 | Iustin Pop |
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199 | a8083063 | Iustin Pop | Args:
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200 | a8083063 | Iustin Pop | filename - Filename (str)
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201 | a8083063 | Iustin Pop |
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202 | a8083063 | Iustin Pop | """
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203 | a8083063 | Iustin Pop | if not (os.path.exists(filename) and os.path.isfile(filename)): |
204 | a8083063 | Iustin Pop | return None |
205 | a8083063 | Iustin Pop | |
206 | a8083063 | Iustin Pop | f = open(filename)
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207 | a8083063 | Iustin Pop | |
208 | a8083063 | Iustin Pop | fp = sha.sha() |
209 | a8083063 | Iustin Pop | while True: |
210 | a8083063 | Iustin Pop | data = f.read(4096)
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211 | a8083063 | Iustin Pop | if not data: |
212 | a8083063 | Iustin Pop | break
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213 | a8083063 | Iustin Pop | |
214 | a8083063 | Iustin Pop | fp.update(data) |
215 | a8083063 | Iustin Pop | |
216 | a8083063 | Iustin Pop | return fp.hexdigest()
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217 | a8083063 | Iustin Pop | |
218 | a8083063 | Iustin Pop | |
219 | a8083063 | Iustin Pop | def FingerprintFiles(files): |
220 | a8083063 | Iustin Pop | """Compute fingerprints for a list of files.
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221 | a8083063 | Iustin Pop |
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222 | a8083063 | Iustin Pop | Args:
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223 | a8083063 | Iustin Pop | files - array of filenames. ( [str, ...] )
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224 | a8083063 | Iustin Pop |
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225 | a8083063 | Iustin Pop | Return value:
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226 | a8083063 | Iustin Pop | dictionary of filename: fingerprint for the files that exist
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227 | a8083063 | Iustin Pop |
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228 | a8083063 | Iustin Pop | """
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229 | a8083063 | Iustin Pop | ret = {} |
230 | a8083063 | Iustin Pop | |
231 | a8083063 | Iustin Pop | for filename in files: |
232 | a8083063 | Iustin Pop | cksum = _FingerprintFile(filename) |
233 | a8083063 | Iustin Pop | if cksum:
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234 | a8083063 | Iustin Pop | ret[filename] = cksum |
235 | a8083063 | Iustin Pop | |
236 | a8083063 | Iustin Pop | return ret
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237 | a8083063 | Iustin Pop | |
238 | a8083063 | Iustin Pop | |
239 | a8083063 | Iustin Pop | def CheckDict(target, template, logname=None): |
240 | a8083063 | Iustin Pop | """Ensure a dictionary has a required set of keys.
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241 | a8083063 | Iustin Pop |
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242 | a8083063 | Iustin Pop | For the given dictionaries `target` and `template`, ensure target
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243 | a8083063 | Iustin Pop | has all the keys from template. Missing keys are added with values
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244 | a8083063 | Iustin Pop | from template.
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245 | a8083063 | Iustin Pop |
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246 | a8083063 | Iustin Pop | Args:
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247 | a8083063 | Iustin Pop | target - the dictionary to check
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248 | a8083063 | Iustin Pop | template - template dictionary
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249 | a8083063 | Iustin Pop | logname - a caller-chosen string to identify the debug log
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250 | a8083063 | Iustin Pop | entry; if None, no logging will be done
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251 | a8083063 | Iustin Pop |
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252 | a8083063 | Iustin Pop | Returns value:
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253 | a8083063 | Iustin Pop | None
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254 | a8083063 | Iustin Pop |
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255 | a8083063 | Iustin Pop | """
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256 | a8083063 | Iustin Pop | missing = [] |
257 | a8083063 | Iustin Pop | for k in template: |
258 | a8083063 | Iustin Pop | if k not in target: |
259 | a8083063 | Iustin Pop | missing.append(k) |
260 | a8083063 | Iustin Pop | target[k] = template[k] |
261 | a8083063 | Iustin Pop | |
262 | a8083063 | Iustin Pop | if missing and logname: |
263 | bb698c1f | Iustin Pop | logging.warning('%s missing keys %s', logname, ', '.join(missing)) |
264 | a8083063 | Iustin Pop | |
265 | a8083063 | Iustin Pop | |
266 | a8083063 | Iustin Pop | def IsProcessAlive(pid): |
267 | a8083063 | Iustin Pop | """Check if a given pid exists on the system.
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268 | a8083063 | Iustin Pop |
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269 | a8083063 | Iustin Pop | Returns: true or false, depending on if the pid exists or not
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270 | a8083063 | Iustin Pop |
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271 | a8083063 | Iustin Pop | Remarks: zombie processes treated as not alive
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272 | a8083063 | Iustin Pop |
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273 | a8083063 | Iustin Pop | """
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274 | a8083063 | Iustin Pop | try:
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275 | a8083063 | Iustin Pop | f = open("/proc/%d/status" % pid) |
276 | a8083063 | Iustin Pop | except IOError, err: |
277 | 4ca1b175 | Alexander Schreiber | if err.errno in (errno.ENOENT, errno.ENOTDIR): |
278 | a8083063 | Iustin Pop | return False |
279 | a8083063 | Iustin Pop | |
280 | a8083063 | Iustin Pop | alive = True
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281 | a8083063 | Iustin Pop | try:
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282 | a8083063 | Iustin Pop | data = f.readlines() |
283 | a8083063 | Iustin Pop | if len(data) > 1: |
284 | a8083063 | Iustin Pop | state = data[1].split()
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285 | a8083063 | Iustin Pop | if len(state) > 1 and state[1] == "Z": |
286 | a8083063 | Iustin Pop | alive = False
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287 | a8083063 | Iustin Pop | finally:
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288 | a8083063 | Iustin Pop | f.close() |
289 | a8083063 | Iustin Pop | |
290 | a8083063 | Iustin Pop | return alive
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291 | a8083063 | Iustin Pop | |
292 | a8083063 | Iustin Pop | |
293 | fee80e90 | Guido Trotter | def IsPidFileAlive(pidfile): |
294 | fee80e90 | Guido Trotter | """Check whether the given pidfile points to a live process.
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295 | fee80e90 | Guido Trotter |
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296 | fee80e90 | Guido Trotter | @param pidfile: Path to a file containing the pid to be checked
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297 | fee80e90 | Guido Trotter | @type pidfile: string (filename)
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298 | fee80e90 | Guido Trotter |
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299 | fee80e90 | Guido Trotter | """
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300 | fee80e90 | Guido Trotter | try:
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301 | fee80e90 | Guido Trotter | pf = open(pidfile, 'r') |
302 | fee80e90 | Guido Trotter | except EnvironmentError, open_err: |
303 | fee80e90 | Guido Trotter | if open_err.errno == errno.ENOENT:
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304 | fee80e90 | Guido Trotter | return False |
305 | fee80e90 | Guido Trotter | else:
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306 | fee80e90 | Guido Trotter | raise errors.GenericError("Cannot open file %s. Error: %s" % |
307 | fee80e90 | Guido Trotter | (pidfile, str(open_err)))
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308 | fee80e90 | Guido Trotter | |
309 | fee80e90 | Guido Trotter | try:
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310 | fee80e90 | Guido Trotter | pid = int(pf.read())
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311 | fee80e90 | Guido Trotter | except ValueError: |
312 | fee80e90 | Guido Trotter | raise errors.GenericError("Invalid pid string in %s" % |
313 | fee80e90 | Guido Trotter | (pidfile,)) |
314 | fee80e90 | Guido Trotter | |
315 | fee80e90 | Guido Trotter | return IsProcessAlive(pid)
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316 | fee80e90 | Guido Trotter | |
317 | fee80e90 | Guido Trotter | |
318 | a8083063 | Iustin Pop | def MatchNameComponent(key, name_list): |
319 | a8083063 | Iustin Pop | """Try to match a name against a list.
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320 | a8083063 | Iustin Pop |
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321 | a8083063 | Iustin Pop | This function will try to match a name like test1 against a list
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322 | a8083063 | Iustin Pop | like ['test1.example.com', 'test2.example.com', ...]. Against this
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323 | a8083063 | Iustin Pop | list, 'test1' as well as 'test1.example' will match, but not
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324 | a8083063 | Iustin Pop | 'test1.ex'. A multiple match will be considered as no match at all
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325 | a8083063 | Iustin Pop | (e.g. 'test1' against ['test1.example.com', 'test1.example.org']).
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326 | a8083063 | Iustin Pop |
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327 | a8083063 | Iustin Pop | Args:
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328 | a8083063 | Iustin Pop | key: the name to be searched
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329 | a8083063 | Iustin Pop | name_list: the list of strings against which to search the key
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330 | a8083063 | Iustin Pop |
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331 | a8083063 | Iustin Pop | Returns:
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332 | a8083063 | Iustin Pop | None if there is no match *or* if there are multiple matches
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333 | a8083063 | Iustin Pop | otherwise the element from the list which matches
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334 | a8083063 | Iustin Pop |
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335 | a8083063 | Iustin Pop | """
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336 | a8083063 | Iustin Pop | mo = re.compile("^%s(\..*)?$" % re.escape(key))
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337 | a8083063 | Iustin Pop | names_filtered = [name for name in name_list if mo.match(name) is not None] |
338 | a8083063 | Iustin Pop | if len(names_filtered) != 1: |
339 | a8083063 | Iustin Pop | return None |
340 | a8083063 | Iustin Pop | return names_filtered[0] |
341 | a8083063 | Iustin Pop | |
342 | a8083063 | Iustin Pop | |
343 | bcf043c9 | Iustin Pop | class HostInfo: |
344 | 89e1fc26 | Iustin Pop | """Class implementing resolver and hostname functionality
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345 | bcf043c9 | Iustin Pop |
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346 | bcf043c9 | Iustin Pop | """
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347 | 89e1fc26 | Iustin Pop | def __init__(self, name=None): |
348 | bcf043c9 | Iustin Pop | """Initialize the host name object.
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349 | bcf043c9 | Iustin Pop |
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350 | 89e1fc26 | Iustin Pop | If the name argument is not passed, it will use this system's
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351 | 89e1fc26 | Iustin Pop | name.
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352 | bcf043c9 | Iustin Pop |
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353 | bcf043c9 | Iustin Pop | """
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354 | 89e1fc26 | Iustin Pop | if name is None: |
355 | 89e1fc26 | Iustin Pop | name = self.SysName()
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356 | 89e1fc26 | Iustin Pop | |
357 | 89e1fc26 | Iustin Pop | self.query = name
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358 | 89e1fc26 | Iustin Pop | self.name, self.aliases, self.ipaddrs = self.LookupHostname(name) |
359 | bcf043c9 | Iustin Pop | self.ip = self.ipaddrs[0] |
360 | bcf043c9 | Iustin Pop | |
361 | c8a0948f | Michael Hanselmann | def ShortName(self): |
362 | c8a0948f | Michael Hanselmann | """Returns the hostname without domain.
|
363 | c8a0948f | Michael Hanselmann |
|
364 | c8a0948f | Michael Hanselmann | """
|
365 | c8a0948f | Michael Hanselmann | return self.name.split('.')[0] |
366 | c8a0948f | Michael Hanselmann | |
367 | 89e1fc26 | Iustin Pop | @staticmethod
|
368 | 89e1fc26 | Iustin Pop | def SysName(): |
369 | 89e1fc26 | Iustin Pop | """Return the current system's name.
|
370 | bcf043c9 | Iustin Pop |
|
371 | 89e1fc26 | Iustin Pop | This is simply a wrapper over socket.gethostname()
|
372 | a8083063 | Iustin Pop |
|
373 | 89e1fc26 | Iustin Pop | """
|
374 | 89e1fc26 | Iustin Pop | return socket.gethostname()
|
375 | a8083063 | Iustin Pop | |
376 | 89e1fc26 | Iustin Pop | @staticmethod
|
377 | 89e1fc26 | Iustin Pop | def LookupHostname(hostname): |
378 | 89e1fc26 | Iustin Pop | """Look up hostname
|
379 | a8083063 | Iustin Pop |
|
380 | 89e1fc26 | Iustin Pop | Args:
|
381 | 89e1fc26 | Iustin Pop | hostname: hostname to look up
|
382 | 89e1fc26 | Iustin Pop |
|
383 | 89e1fc26 | Iustin Pop | Returns:
|
384 | 89e1fc26 | Iustin Pop | a tuple (name, aliases, ipaddrs) as returned by socket.gethostbyname_ex
|
385 | 89e1fc26 | Iustin Pop | in case of errors in resolving, we raise a ResolverError
|
386 | 89e1fc26 | Iustin Pop |
|
387 | 89e1fc26 | Iustin Pop | """
|
388 | 89e1fc26 | Iustin Pop | try:
|
389 | 89e1fc26 | Iustin Pop | result = socket.gethostbyname_ex(hostname) |
390 | 89e1fc26 | Iustin Pop | except socket.gaierror, err:
|
391 | 89e1fc26 | Iustin Pop | # hostname not found in DNS
|
392 | 89e1fc26 | Iustin Pop | raise errors.ResolverError(hostname, err.args[0], err.args[1]) |
393 | a8083063 | Iustin Pop | |
394 | 89e1fc26 | Iustin Pop | return result
|
395 | a8083063 | Iustin Pop | |
396 | a8083063 | Iustin Pop | |
397 | a8083063 | Iustin Pop | def ListVolumeGroups(): |
398 | a8083063 | Iustin Pop | """List volume groups and their size
|
399 | a8083063 | Iustin Pop |
|
400 | a8083063 | Iustin Pop | Returns:
|
401 | a8083063 | Iustin Pop | Dictionary with keys volume name and values the size of the volume
|
402 | a8083063 | Iustin Pop |
|
403 | a8083063 | Iustin Pop | """
|
404 | a8083063 | Iustin Pop | command = "vgs --noheadings --units m --nosuffix -o name,size"
|
405 | a8083063 | Iustin Pop | result = RunCmd(command) |
406 | a8083063 | Iustin Pop | retval = {} |
407 | a8083063 | Iustin Pop | if result.failed:
|
408 | a8083063 | Iustin Pop | return retval
|
409 | a8083063 | Iustin Pop | |
410 | a8083063 | Iustin Pop | for line in result.stdout.splitlines(): |
411 | a8083063 | Iustin Pop | try:
|
412 | a8083063 | Iustin Pop | name, size = line.split() |
413 | a8083063 | Iustin Pop | size = int(float(size)) |
414 | a8083063 | Iustin Pop | except (IndexError, ValueError), err: |
415 | bb698c1f | Iustin Pop | logging.error("Invalid output from vgs (%s): %s", err, line)
|
416 | a8083063 | Iustin Pop | continue
|
417 | a8083063 | Iustin Pop | |
418 | a8083063 | Iustin Pop | retval[name] = size |
419 | a8083063 | Iustin Pop | |
420 | a8083063 | Iustin Pop | return retval
|
421 | a8083063 | Iustin Pop | |
422 | a8083063 | Iustin Pop | |
423 | a8083063 | Iustin Pop | def BridgeExists(bridge): |
424 | a8083063 | Iustin Pop | """Check whether the given bridge exists in the system
|
425 | a8083063 | Iustin Pop |
|
426 | a8083063 | Iustin Pop | Returns:
|
427 | a8083063 | Iustin Pop | True if it does, false otherwise.
|
428 | a8083063 | Iustin Pop |
|
429 | a8083063 | Iustin Pop | """
|
430 | a8083063 | Iustin Pop | return os.path.isdir("/sys/class/net/%s/bridge" % bridge) |
431 | a8083063 | Iustin Pop | |
432 | a8083063 | Iustin Pop | |
433 | a8083063 | Iustin Pop | def NiceSort(name_list): |
434 | a8083063 | Iustin Pop | """Sort a list of strings based on digit and non-digit groupings.
|
435 | a8083063 | Iustin Pop |
|
436 | a8083063 | Iustin Pop | Given a list of names ['a1', 'a10', 'a11', 'a2'] this function will
|
437 | a8083063 | Iustin Pop | sort the list in the logical order ['a1', 'a2', 'a10', 'a11'].
|
438 | a8083063 | Iustin Pop |
|
439 | a8083063 | Iustin Pop | The sort algorithm breaks each name in groups of either only-digits
|
440 | a8083063 | Iustin Pop | or no-digits. Only the first eight such groups are considered, and
|
441 | a8083063 | Iustin Pop | after that we just use what's left of the string.
|
442 | a8083063 | Iustin Pop |
|
443 | a8083063 | Iustin Pop | Return value
|
444 | a8083063 | Iustin Pop | - a copy of the list sorted according to our algorithm
|
445 | a8083063 | Iustin Pop |
|
446 | a8083063 | Iustin Pop | """
|
447 | a8083063 | Iustin Pop | _SORTER_BASE = "(\D+|\d+)"
|
448 | a8083063 | Iustin Pop | _SORTER_FULL = "^%s%s?%s?%s?%s?%s?%s?%s?.*$" % (_SORTER_BASE, _SORTER_BASE,
|
449 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
450 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE, |
451 | a8083063 | Iustin Pop | _SORTER_BASE, _SORTER_BASE) |
452 | a8083063 | Iustin Pop | _SORTER_RE = re.compile(_SORTER_FULL) |
453 | a8083063 | Iustin Pop | _SORTER_NODIGIT = re.compile("^\D*$")
|
454 | a8083063 | Iustin Pop | def _TryInt(val): |
455 | a8083063 | Iustin Pop | """Attempts to convert a variable to integer."""
|
456 | a8083063 | Iustin Pop | if val is None or _SORTER_NODIGIT.match(val): |
457 | a8083063 | Iustin Pop | return val
|
458 | a8083063 | Iustin Pop | rval = int(val)
|
459 | a8083063 | Iustin Pop | return rval
|
460 | a8083063 | Iustin Pop | |
461 | a8083063 | Iustin Pop | to_sort = [([_TryInt(grp) for grp in _SORTER_RE.match(name).groups()], name) |
462 | a8083063 | Iustin Pop | for name in name_list] |
463 | a8083063 | Iustin Pop | to_sort.sort() |
464 | a8083063 | Iustin Pop | return [tup[1] for tup in to_sort] |
465 | a8083063 | Iustin Pop | |
466 | a8083063 | Iustin Pop | |
467 | a8083063 | Iustin Pop | def TryConvert(fn, val): |
468 | a8083063 | Iustin Pop | """Try to convert a value ignoring errors.
|
469 | a8083063 | Iustin Pop |
|
470 | a8083063 | Iustin Pop | This function tries to apply function `fn` to `val`. If no
|
471 | a8083063 | Iustin Pop | ValueError or TypeError exceptions are raised, it will return the
|
472 | a8083063 | Iustin Pop | result, else it will return the original value. Any other exceptions
|
473 | a8083063 | Iustin Pop | are propagated to the caller.
|
474 | a8083063 | Iustin Pop |
|
475 | a8083063 | Iustin Pop | """
|
476 | a8083063 | Iustin Pop | try:
|
477 | a8083063 | Iustin Pop | nv = fn(val) |
478 | a8083063 | Iustin Pop | except (ValueError, TypeError), err: |
479 | a8083063 | Iustin Pop | nv = val |
480 | a8083063 | Iustin Pop | return nv
|
481 | a8083063 | Iustin Pop | |
482 | a8083063 | Iustin Pop | |
483 | a8083063 | Iustin Pop | def IsValidIP(ip): |
484 | a8083063 | Iustin Pop | """Verifies the syntax of an IP address.
|
485 | a8083063 | Iustin Pop |
|
486 | a8083063 | Iustin Pop | This function checks if the ip address passes is valid or not based
|
487 | a8083063 | Iustin Pop | on syntax (not ip range, class calculations or anything).
|
488 | a8083063 | Iustin Pop |
|
489 | a8083063 | Iustin Pop | """
|
490 | a8083063 | Iustin Pop | unit = "(0|[1-9]\d{0,2})"
|
491 | a8083063 | Iustin Pop | return re.match("^%s\.%s\.%s\.%s$" % (unit, unit, unit, unit), ip) |
492 | a8083063 | Iustin Pop | |
493 | a8083063 | Iustin Pop | |
494 | a8083063 | Iustin Pop | def IsValidShellParam(word): |
495 | a8083063 | Iustin Pop | """Verifies is the given word is safe from the shell's p.o.v.
|
496 | a8083063 | Iustin Pop |
|
497 | a8083063 | Iustin Pop | This means that we can pass this to a command via the shell and be
|
498 | a8083063 | Iustin Pop | sure that it doesn't alter the command line and is passed as such to
|
499 | a8083063 | Iustin Pop | the actual command.
|
500 | a8083063 | Iustin Pop |
|
501 | a8083063 | Iustin Pop | Note that we are overly restrictive here, in order to be on the safe
|
502 | a8083063 | Iustin Pop | side.
|
503 | a8083063 | Iustin Pop |
|
504 | a8083063 | Iustin Pop | """
|
505 | a8083063 | Iustin Pop | return bool(re.match("^[-a-zA-Z0-9._+/:%@]+$", word)) |
506 | a8083063 | Iustin Pop | |
507 | a8083063 | Iustin Pop | |
508 | a8083063 | Iustin Pop | def BuildShellCmd(template, *args): |
509 | a8083063 | Iustin Pop | """Build a safe shell command line from the given arguments.
|
510 | a8083063 | Iustin Pop |
|
511 | a8083063 | Iustin Pop | This function will check all arguments in the args list so that they
|
512 | a8083063 | Iustin Pop | are valid shell parameters (i.e. they don't contain shell
|
513 | a8083063 | Iustin Pop | metacharaters). If everything is ok, it will return the result of
|
514 | a8083063 | Iustin Pop | template % args.
|
515 | a8083063 | Iustin Pop |
|
516 | a8083063 | Iustin Pop | """
|
517 | a8083063 | Iustin Pop | for word in args: |
518 | a8083063 | Iustin Pop | if not IsValidShellParam(word): |
519 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Shell argument '%s' contains" |
520 | 3ecf6786 | Iustin Pop | " invalid characters" % word)
|
521 | a8083063 | Iustin Pop | return template % args
|
522 | a8083063 | Iustin Pop | |
523 | a8083063 | Iustin Pop | |
524 | a8083063 | Iustin Pop | def FormatUnit(value): |
525 | a8083063 | Iustin Pop | """Formats an incoming number of MiB with the appropriate unit.
|
526 | a8083063 | Iustin Pop |
|
527 | a8083063 | Iustin Pop | Value needs to be passed as a numeric type. Return value is always a string.
|
528 | a8083063 | Iustin Pop |
|
529 | a8083063 | Iustin Pop | """
|
530 | a8083063 | Iustin Pop | if value < 1024: |
531 | a8083063 | Iustin Pop | return "%dM" % round(value, 0) |
532 | a8083063 | Iustin Pop | |
533 | a8083063 | Iustin Pop | elif value < (1024 * 1024): |
534 | a8083063 | Iustin Pop | return "%0.1fG" % round(float(value) / 1024, 1) |
535 | a8083063 | Iustin Pop | |
536 | a8083063 | Iustin Pop | else:
|
537 | a8083063 | Iustin Pop | return "%0.1fT" % round(float(value) / 1024 / 1024, 1) |
538 | a8083063 | Iustin Pop | |
539 | a8083063 | Iustin Pop | |
540 | a8083063 | Iustin Pop | def ParseUnit(input_string): |
541 | a8083063 | Iustin Pop | """Tries to extract number and scale from the given string.
|
542 | a8083063 | Iustin Pop |
|
543 | a8083063 | Iustin Pop | Input must be in the format NUMBER+ [DOT NUMBER+] SPACE* [UNIT]. If no unit
|
544 | a8083063 | Iustin Pop | is specified, it defaults to MiB. Return value is always an int in MiB.
|
545 | a8083063 | Iustin Pop |
|
546 | a8083063 | Iustin Pop | """
|
547 | a8083063 | Iustin Pop | m = re.match('^([.\d]+)\s*([a-zA-Z]+)?$', input_string)
|
548 | a8083063 | Iustin Pop | if not m: |
549 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Invalid format") |
550 | a8083063 | Iustin Pop | |
551 | a8083063 | Iustin Pop | value = float(m.groups()[0]) |
552 | a8083063 | Iustin Pop | |
553 | a8083063 | Iustin Pop | unit = m.groups()[1]
|
554 | a8083063 | Iustin Pop | if unit:
|
555 | a8083063 | Iustin Pop | lcunit = unit.lower() |
556 | a8083063 | Iustin Pop | else:
|
557 | a8083063 | Iustin Pop | lcunit = 'm'
|
558 | a8083063 | Iustin Pop | |
559 | a8083063 | Iustin Pop | if lcunit in ('m', 'mb', 'mib'): |
560 | a8083063 | Iustin Pop | # Value already in MiB
|
561 | a8083063 | Iustin Pop | pass
|
562 | a8083063 | Iustin Pop | |
563 | a8083063 | Iustin Pop | elif lcunit in ('g', 'gb', 'gib'): |
564 | a8083063 | Iustin Pop | value *= 1024
|
565 | a8083063 | Iustin Pop | |
566 | a8083063 | Iustin Pop | elif lcunit in ('t', 'tb', 'tib'): |
567 | a8083063 | Iustin Pop | value *= 1024 * 1024 |
568 | a8083063 | Iustin Pop | |
569 | a8083063 | Iustin Pop | else:
|
570 | 3ecf6786 | Iustin Pop | raise errors.UnitParseError("Unknown unit: %s" % unit) |
571 | a8083063 | Iustin Pop | |
572 | a8083063 | Iustin Pop | # Make sure we round up
|
573 | a8083063 | Iustin Pop | if int(value) < value: |
574 | a8083063 | Iustin Pop | value += 1
|
575 | a8083063 | Iustin Pop | |
576 | a8083063 | Iustin Pop | # Round up to the next multiple of 4
|
577 | a8083063 | Iustin Pop | value = int(value)
|
578 | a8083063 | Iustin Pop | if value % 4: |
579 | a8083063 | Iustin Pop | value += 4 - value % 4 |
580 | a8083063 | Iustin Pop | |
581 | a8083063 | Iustin Pop | return value
|
582 | a8083063 | Iustin Pop | |
583 | a8083063 | Iustin Pop | |
584 | a8083063 | Iustin Pop | def AddAuthorizedKey(file_name, key): |
585 | a8083063 | Iustin Pop | """Adds an SSH public key to an authorized_keys file.
|
586 | a8083063 | Iustin Pop |
|
587 | a8083063 | Iustin Pop | Args:
|
588 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
589 | a8083063 | Iustin Pop | key: String containing key
|
590 | a8083063 | Iustin Pop | """
|
591 | a8083063 | Iustin Pop | key_fields = key.split() |
592 | a8083063 | Iustin Pop | |
593 | a8083063 | Iustin Pop | f = open(file_name, 'a+') |
594 | a8083063 | Iustin Pop | try:
|
595 | a8083063 | Iustin Pop | nl = True
|
596 | a8083063 | Iustin Pop | for line in f: |
597 | a8083063 | Iustin Pop | # Ignore whitespace changes
|
598 | a8083063 | Iustin Pop | if line.split() == key_fields:
|
599 | a8083063 | Iustin Pop | break
|
600 | a8083063 | Iustin Pop | nl = line.endswith('\n')
|
601 | a8083063 | Iustin Pop | else:
|
602 | a8083063 | Iustin Pop | if not nl: |
603 | a8083063 | Iustin Pop | f.write("\n")
|
604 | a8083063 | Iustin Pop | f.write(key.rstrip('\r\n'))
|
605 | a8083063 | Iustin Pop | f.write("\n")
|
606 | a8083063 | Iustin Pop | f.flush() |
607 | a8083063 | Iustin Pop | finally:
|
608 | a8083063 | Iustin Pop | f.close() |
609 | a8083063 | Iustin Pop | |
610 | a8083063 | Iustin Pop | |
611 | a8083063 | Iustin Pop | def RemoveAuthorizedKey(file_name, key): |
612 | a8083063 | Iustin Pop | """Removes an SSH public key from an authorized_keys file.
|
613 | a8083063 | Iustin Pop |
|
614 | a8083063 | Iustin Pop | Args:
|
615 | a8083063 | Iustin Pop | file_name: Path to authorized_keys file
|
616 | a8083063 | Iustin Pop | key: String containing key
|
617 | a8083063 | Iustin Pop | """
|
618 | a8083063 | Iustin Pop | key_fields = key.split() |
619 | a8083063 | Iustin Pop | |
620 | a8083063 | Iustin Pop | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
621 | a8083063 | Iustin Pop | try:
|
622 | 59f82e3f | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
623 | a8083063 | Iustin Pop | try:
|
624 | 59f82e3f | Michael Hanselmann | f = open(file_name, 'r') |
625 | 59f82e3f | Michael Hanselmann | try:
|
626 | 59f82e3f | Michael Hanselmann | for line in f: |
627 | 59f82e3f | Michael Hanselmann | # Ignore whitespace changes while comparing lines
|
628 | 59f82e3f | Michael Hanselmann | if line.split() != key_fields:
|
629 | 59f82e3f | Michael Hanselmann | out.write(line) |
630 | 899d2a81 | Michael Hanselmann | |
631 | 899d2a81 | Michael Hanselmann | out.flush() |
632 | 899d2a81 | Michael Hanselmann | os.rename(tmpname, file_name) |
633 | 899d2a81 | Michael Hanselmann | finally:
|
634 | 899d2a81 | Michael Hanselmann | f.close() |
635 | 899d2a81 | Michael Hanselmann | finally:
|
636 | 899d2a81 | Michael Hanselmann | out.close() |
637 | 899d2a81 | Michael Hanselmann | except:
|
638 | 899d2a81 | Michael Hanselmann | RemoveFile(tmpname) |
639 | 899d2a81 | Michael Hanselmann | raise
|
640 | 899d2a81 | Michael Hanselmann | |
641 | 899d2a81 | Michael Hanselmann | |
642 | 9440aeab | Michael Hanselmann | def SetEtcHostsEntry(file_name, ip, hostname, aliases): |
643 | 9440aeab | Michael Hanselmann | """Sets the name of an IP address and hostname in /etc/hosts.
|
644 | 899d2a81 | Michael Hanselmann |
|
645 | 899d2a81 | Michael Hanselmann | """
|
646 | 7fbb1f65 | Michael Hanselmann | # Ensure aliases are unique
|
647 | 7fbb1f65 | Michael Hanselmann | aliases = UniqueSequence([hostname] + aliases)[1:]
|
648 | 7fbb1f65 | Michael Hanselmann | |
649 | 9440aeab | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
650 | 899d2a81 | Michael Hanselmann | try:
|
651 | 9440aeab | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
652 | 9440aeab | Michael Hanselmann | try:
|
653 | 9440aeab | Michael Hanselmann | f = open(file_name, 'r') |
654 | 9440aeab | Michael Hanselmann | try:
|
655 | 9440aeab | Michael Hanselmann | written = False
|
656 | 9440aeab | Michael Hanselmann | for line in f: |
657 | 9440aeab | Michael Hanselmann | fields = line.split() |
658 | 7e3dbb94 | Iustin Pop | if fields and not fields[0].startswith('#') and ip == fields[0]: |
659 | 9440aeab | Michael Hanselmann | continue
|
660 | 9440aeab | Michael Hanselmann | out.write(line) |
661 | 9440aeab | Michael Hanselmann | |
662 | 7e3dbb94 | Iustin Pop | out.write("%s\t%s" % (ip, hostname))
|
663 | 9440aeab | Michael Hanselmann | if aliases:
|
664 | 9440aeab | Michael Hanselmann | out.write(" %s" % ' '.join(aliases)) |
665 | 9440aeab | Michael Hanselmann | out.write('\n')
|
666 | 9440aeab | Michael Hanselmann | |
667 | 9440aeab | Michael Hanselmann | out.flush() |
668 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
669 | 9440aeab | Michael Hanselmann | os.rename(tmpname, file_name) |
670 | 9440aeab | Michael Hanselmann | finally:
|
671 | 9440aeab | Michael Hanselmann | f.close() |
672 | 9440aeab | Michael Hanselmann | finally:
|
673 | 9440aeab | Michael Hanselmann | out.close() |
674 | 9440aeab | Michael Hanselmann | except:
|
675 | 9440aeab | Michael Hanselmann | RemoveFile(tmpname) |
676 | 9440aeab | Michael Hanselmann | raise
|
677 | 899d2a81 | Michael Hanselmann | |
678 | 899d2a81 | Michael Hanselmann | |
679 | d9c02ca6 | Michael Hanselmann | def AddHostToEtcHosts(hostname): |
680 | d9c02ca6 | Michael Hanselmann | """Wrapper around SetEtcHostsEntry.
|
681 | d9c02ca6 | Michael Hanselmann |
|
682 | d9c02ca6 | Michael Hanselmann | """
|
683 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
684 | d9c02ca6 | Michael Hanselmann | SetEtcHostsEntry(constants.ETC_HOSTS, hi.ip, hi.name, [hi.ShortName()]) |
685 | d9c02ca6 | Michael Hanselmann | |
686 | d9c02ca6 | Michael Hanselmann | |
687 | 899d2a81 | Michael Hanselmann | def RemoveEtcHostsEntry(file_name, hostname): |
688 | 3e1cdf9f | Michael Hanselmann | """Removes a hostname from /etc/hosts.
|
689 | 899d2a81 | Michael Hanselmann |
|
690 | 9440aeab | Michael Hanselmann | IP addresses without names are removed from the file.
|
691 | 899d2a81 | Michael Hanselmann | """
|
692 | 899d2a81 | Michael Hanselmann | fd, tmpname = tempfile.mkstemp(dir=os.path.dirname(file_name)) |
693 | 899d2a81 | Michael Hanselmann | try:
|
694 | 899d2a81 | Michael Hanselmann | out = os.fdopen(fd, 'w')
|
695 | 899d2a81 | Michael Hanselmann | try:
|
696 | 899d2a81 | Michael Hanselmann | f = open(file_name, 'r') |
697 | 899d2a81 | Michael Hanselmann | try:
|
698 | 899d2a81 | Michael Hanselmann | for line in f: |
699 | 899d2a81 | Michael Hanselmann | fields = line.split() |
700 | 899d2a81 | Michael Hanselmann | if len(fields) > 1 and not fields[0].startswith('#'): |
701 | 899d2a81 | Michael Hanselmann | names = fields[1:]
|
702 | 899d2a81 | Michael Hanselmann | if hostname in names: |
703 | 899d2a81 | Michael Hanselmann | while hostname in names: |
704 | 899d2a81 | Michael Hanselmann | names.remove(hostname) |
705 | 899d2a81 | Michael Hanselmann | if names:
|
706 | 9440aeab | Michael Hanselmann | out.write("%s %s\n" % (fields[0], ' '.join(names))) |
707 | 899d2a81 | Michael Hanselmann | continue
|
708 | 899d2a81 | Michael Hanselmann | |
709 | 899d2a81 | Michael Hanselmann | out.write(line) |
710 | 59f82e3f | Michael Hanselmann | |
711 | 59f82e3f | Michael Hanselmann | out.flush() |
712 | 2e3e75b7 | Michael Hanselmann | os.fsync(out) |
713 | 59f82e3f | Michael Hanselmann | os.rename(tmpname, file_name) |
714 | 59f82e3f | Michael Hanselmann | finally:
|
715 | 59f82e3f | Michael Hanselmann | f.close() |
716 | a8083063 | Iustin Pop | finally:
|
717 | 59f82e3f | Michael Hanselmann | out.close() |
718 | 59f82e3f | Michael Hanselmann | except:
|
719 | 59f82e3f | Michael Hanselmann | RemoveFile(tmpname) |
720 | 59f82e3f | Michael Hanselmann | raise
|
721 | a8083063 | Iustin Pop | |
722 | a8083063 | Iustin Pop | |
723 | d9c02ca6 | Michael Hanselmann | def RemoveHostFromEtcHosts(hostname): |
724 | d9c02ca6 | Michael Hanselmann | """Wrapper around RemoveEtcHostsEntry.
|
725 | d9c02ca6 | Michael Hanselmann |
|
726 | d9c02ca6 | Michael Hanselmann | """
|
727 | d9c02ca6 | Michael Hanselmann | hi = HostInfo(name=hostname) |
728 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.name) |
729 | d9c02ca6 | Michael Hanselmann | RemoveEtcHostsEntry(constants.ETC_HOSTS, hi.ShortName()) |
730 | d9c02ca6 | Michael Hanselmann | |
731 | d9c02ca6 | Michael Hanselmann | |
732 | a8083063 | Iustin Pop | def CreateBackup(file_name): |
733 | a8083063 | Iustin Pop | """Creates a backup of a file.
|
734 | a8083063 | Iustin Pop |
|
735 | a8083063 | Iustin Pop | Returns: the path to the newly created backup file.
|
736 | a8083063 | Iustin Pop |
|
737 | a8083063 | Iustin Pop | """
|
738 | a8083063 | Iustin Pop | if not os.path.isfile(file_name): |
739 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Can't make a backup of a non-file '%s'" % |
740 | 3ecf6786 | Iustin Pop | file_name) |
741 | a8083063 | Iustin Pop | |
742 | 081b1e69 | Michael Hanselmann | prefix = '%s.backup-%d.' % (os.path.basename(file_name), int(time.time())) |
743 | 65fe4693 | Iustin Pop | dir_name = os.path.dirname(file_name) |
744 | 081b1e69 | Michael Hanselmann | |
745 | 081b1e69 | Michael Hanselmann | fsrc = open(file_name, 'rb') |
746 | 081b1e69 | Michael Hanselmann | try:
|
747 | 65fe4693 | Iustin Pop | (fd, backup_name) = tempfile.mkstemp(prefix=prefix, dir=dir_name) |
748 | 081b1e69 | Michael Hanselmann | fdst = os.fdopen(fd, 'wb')
|
749 | 081b1e69 | Michael Hanselmann | try:
|
750 | 081b1e69 | Michael Hanselmann | shutil.copyfileobj(fsrc, fdst) |
751 | 081b1e69 | Michael Hanselmann | finally:
|
752 | 081b1e69 | Michael Hanselmann | fdst.close() |
753 | 081b1e69 | Michael Hanselmann | finally:
|
754 | 081b1e69 | Michael Hanselmann | fsrc.close() |
755 | 081b1e69 | Michael Hanselmann | |
756 | a8083063 | Iustin Pop | return backup_name
|
757 | a8083063 | Iustin Pop | |
758 | a8083063 | Iustin Pop | |
759 | a8083063 | Iustin Pop | def ShellQuote(value): |
760 | a8083063 | Iustin Pop | """Quotes shell argument according to POSIX.
|
761 | 3ecf6786 | Iustin Pop |
|
762 | a8083063 | Iustin Pop | """
|
763 | a8083063 | Iustin Pop | if _re_shell_unquoted.match(value):
|
764 | a8083063 | Iustin Pop | return value
|
765 | a8083063 | Iustin Pop | else:
|
766 | a8083063 | Iustin Pop | return "'%s'" % value.replace("'", "'\\''") |
767 | a8083063 | Iustin Pop | |
768 | a8083063 | Iustin Pop | |
769 | a8083063 | Iustin Pop | def ShellQuoteArgs(args): |
770 | a8083063 | Iustin Pop | """Quotes all given shell arguments and concatenates using spaces.
|
771 | a8083063 | Iustin Pop |
|
772 | a8083063 | Iustin Pop | """
|
773 | a8083063 | Iustin Pop | return ' '.join([ShellQuote(i) for i in args]) |
774 | 88d14415 | Michael Hanselmann | |
775 | 88d14415 | Michael Hanselmann | |
776 | b15d625f | Iustin Pop | def TcpPing(target, port, timeout=10, live_port_needed=False, source=None): |
777 | 2c30e9d7 | Alexander Schreiber | """Simple ping implementation using TCP connect(2).
|
778 | 2c30e9d7 | Alexander Schreiber |
|
779 | b15d625f | Iustin Pop | Try to do a TCP connect(2) from an optional source IP to the
|
780 | b15d625f | Iustin Pop | specified target IP and the specified target port. If the optional
|
781 | b15d625f | Iustin Pop | parameter live_port_needed is set to true, requires the remote end
|
782 | b15d625f | Iustin Pop | to accept the connection. The timeout is specified in seconds and
|
783 | b15d625f | Iustin Pop | defaults to 10 seconds. If the source optional argument is not
|
784 | b15d625f | Iustin Pop | passed, the source address selection is left to the kernel,
|
785 | b15d625f | Iustin Pop | otherwise we try to connect using the passed address (failures to
|
786 | b15d625f | Iustin Pop | bind other than EADDRNOTAVAIL will be ignored).
|
787 | 2c30e9d7 | Alexander Schreiber |
|
788 | 2c30e9d7 | Alexander Schreiber | """
|
789 | 2c30e9d7 | Alexander Schreiber | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
790 | 2c30e9d7 | Alexander Schreiber | |
791 | 2c30e9d7 | Alexander Schreiber | sucess = False
|
792 | 2c30e9d7 | Alexander Schreiber | |
793 | b15d625f | Iustin Pop | if source is not None: |
794 | b15d625f | Iustin Pop | try:
|
795 | b15d625f | Iustin Pop | sock.bind((source, 0))
|
796 | b15d625f | Iustin Pop | except socket.error, (errcode, errstring):
|
797 | b15d625f | Iustin Pop | if errcode == errno.EADDRNOTAVAIL:
|
798 | b15d625f | Iustin Pop | success = False
|
799 | 2c30e9d7 | Alexander Schreiber | |
800 | 2c30e9d7 | Alexander Schreiber | sock.settimeout(timeout) |
801 | 2c30e9d7 | Alexander Schreiber | |
802 | 2c30e9d7 | Alexander Schreiber | try:
|
803 | 2c30e9d7 | Alexander Schreiber | sock.connect((target, port)) |
804 | 2c30e9d7 | Alexander Schreiber | sock.close() |
805 | 2c30e9d7 | Alexander Schreiber | success = True
|
806 | 2c30e9d7 | Alexander Schreiber | except socket.timeout:
|
807 | 2c30e9d7 | Alexander Schreiber | success = False
|
808 | 2c30e9d7 | Alexander Schreiber | except socket.error, (errcode, errstring):
|
809 | 4ca1b175 | Alexander Schreiber | success = (not live_port_needed) and (errcode == errno.ECONNREFUSED) |
810 | 2c30e9d7 | Alexander Schreiber | |
811 | 2c30e9d7 | Alexander Schreiber | return success
|
812 | eedbda4b | Michael Hanselmann | |
813 | eedbda4b | Michael Hanselmann | |
814 | eedbda4b | Michael Hanselmann | def ListVisibleFiles(path): |
815 | eedbda4b | Michael Hanselmann | """Returns a list of all visible files in a directory.
|
816 | eedbda4b | Michael Hanselmann |
|
817 | eedbda4b | Michael Hanselmann | """
|
818 | f3299a07 | Michael Hanselmann | files = [i for i in os.listdir(path) if not i.startswith(".")] |
819 | f3299a07 | Michael Hanselmann | files.sort() |
820 | f3299a07 | Michael Hanselmann | return files
|
821 | 2f8b60b3 | Iustin Pop | |
822 | 2f8b60b3 | Iustin Pop | |
823 | 257f4c0a | Iustin Pop | def GetHomeDir(user, default=None): |
824 | 257f4c0a | Iustin Pop | """Try to get the homedir of the given user.
|
825 | 257f4c0a | Iustin Pop |
|
826 | 257f4c0a | Iustin Pop | The user can be passed either as a string (denoting the name) or as
|
827 | 257f4c0a | Iustin Pop | an integer (denoting the user id). If the user is not found, the
|
828 | 257f4c0a | Iustin Pop | 'default' argument is returned, which defaults to None.
|
829 | 2f8b60b3 | Iustin Pop |
|
830 | 2f8b60b3 | Iustin Pop | """
|
831 | 2f8b60b3 | Iustin Pop | try:
|
832 | 257f4c0a | Iustin Pop | if isinstance(user, basestring): |
833 | 257f4c0a | Iustin Pop | result = pwd.getpwnam(user) |
834 | 257f4c0a | Iustin Pop | elif isinstance(user, (int, long)): |
835 | 257f4c0a | Iustin Pop | result = pwd.getpwuid(user) |
836 | 257f4c0a | Iustin Pop | else:
|
837 | 257f4c0a | Iustin Pop | raise errors.ProgrammerError("Invalid type passed to GetHomeDir (%s)" % |
838 | 257f4c0a | Iustin Pop | type(user))
|
839 | 2f8b60b3 | Iustin Pop | except KeyError: |
840 | 2f8b60b3 | Iustin Pop | return default
|
841 | 2f8b60b3 | Iustin Pop | return result.pw_dir
|
842 | 59072e7e | Michael Hanselmann | |
843 | 59072e7e | Michael Hanselmann | |
844 | 24818e8f | Michael Hanselmann | def NewUUID(): |
845 | 59072e7e | Michael Hanselmann | """Returns a random UUID.
|
846 | 59072e7e | Michael Hanselmann |
|
847 | 59072e7e | Michael Hanselmann | """
|
848 | 59072e7e | Michael Hanselmann | f = open("/proc/sys/kernel/random/uuid", "r") |
849 | 59072e7e | Michael Hanselmann | try:
|
850 | 59072e7e | Michael Hanselmann | return f.read(128).rstrip("\n") |
851 | 59072e7e | Michael Hanselmann | finally:
|
852 | 59072e7e | Michael Hanselmann | f.close() |
853 | 087b34fe | Iustin Pop | |
854 | 087b34fe | Iustin Pop | |
855 | 087b34fe | Iustin Pop | def WriteFile(file_name, fn=None, data=None, |
856 | 087b34fe | Iustin Pop | mode=None, uid=-1, gid=-1, |
857 | 71714516 | Michael Hanselmann | atime=None, mtime=None, close=True, |
858 | 04a8d789 | Michael Hanselmann | dry_run=False, backup=False, |
859 | 71714516 | Michael Hanselmann | prewrite=None, postwrite=None): |
860 | 087b34fe | Iustin Pop | """(Over)write a file atomically.
|
861 | 087b34fe | Iustin Pop |
|
862 | 087b34fe | Iustin Pop | The file_name and either fn (a function taking one argument, the
|
863 | 087b34fe | Iustin Pop | file descriptor, and which should write the data to it) or data (the
|
864 | 087b34fe | Iustin Pop | contents of the file) must be passed. The other arguments are
|
865 | 087b34fe | Iustin Pop | optional and allow setting the file mode, owner and group, and the
|
866 | 087b34fe | Iustin Pop | mtime/atime of the file.
|
867 | 087b34fe | Iustin Pop |
|
868 | 087b34fe | Iustin Pop | If the function doesn't raise an exception, it has succeeded and the
|
869 | 087b34fe | Iustin Pop | target file has the new contents. If the file has raised an
|
870 | 087b34fe | Iustin Pop | exception, an existing target file should be unmodified and the
|
871 | 087b34fe | Iustin Pop | temporary file should be removed.
|
872 | 087b34fe | Iustin Pop |
|
873 | 71714516 | Michael Hanselmann | Args:
|
874 | 71714516 | Michael Hanselmann | file_name: New filename
|
875 | 71714516 | Michael Hanselmann | fn: Content writing function, called with file descriptor as parameter
|
876 | 71714516 | Michael Hanselmann | data: Content as string
|
877 | 71714516 | Michael Hanselmann | mode: File mode
|
878 | 71714516 | Michael Hanselmann | uid: Owner
|
879 | 71714516 | Michael Hanselmann | gid: Group
|
880 | 71714516 | Michael Hanselmann | atime: Access time
|
881 | 71714516 | Michael Hanselmann | mtime: Modification time
|
882 | 71714516 | Michael Hanselmann | close: Whether to close file after writing it
|
883 | 71714516 | Michael Hanselmann | prewrite: Function object called before writing content
|
884 | 71714516 | Michael Hanselmann | postwrite: Function object called after writing content
|
885 | 71714516 | Michael Hanselmann |
|
886 | 71714516 | Michael Hanselmann | Returns:
|
887 | 71714516 | Michael Hanselmann | None if "close" parameter evaluates to True, otherwise file descriptor.
|
888 | 71714516 | Michael Hanselmann |
|
889 | 087b34fe | Iustin Pop | """
|
890 | 04a8d789 | Michael Hanselmann | if not os.path.isabs(file_name): |
891 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Path passed to WriteFile is not" |
892 | 087b34fe | Iustin Pop | " absolute: '%s'" % file_name)
|
893 | 087b34fe | Iustin Pop | |
894 | 087b34fe | Iustin Pop | if [fn, data].count(None) != 1: |
895 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("fn or data required") |
896 | 087b34fe | Iustin Pop | |
897 | 087b34fe | Iustin Pop | if [atime, mtime].count(None) == 1: |
898 | 087b34fe | Iustin Pop | raise errors.ProgrammerError("Both atime and mtime must be either" |
899 | 087b34fe | Iustin Pop | " set or None")
|
900 | 087b34fe | Iustin Pop | |
901 | 70f4497c | Michael Hanselmann | if backup and not dry_run and os.path.isfile(file_name): |
902 | 70f4497c | Michael Hanselmann | CreateBackup(file_name) |
903 | 087b34fe | Iustin Pop | |
904 | 087b34fe | Iustin Pop | dir_name, base_name = os.path.split(file_name) |
905 | 087b34fe | Iustin Pop | fd, new_name = tempfile.mkstemp('.new', base_name, dir_name)
|
906 | 087b34fe | Iustin Pop | # here we need to make sure we remove the temp file, if any error
|
907 | 087b34fe | Iustin Pop | # leaves it in place
|
908 | 087b34fe | Iustin Pop | try:
|
909 | 087b34fe | Iustin Pop | if uid != -1 or gid != -1: |
910 | 087b34fe | Iustin Pop | os.chown(new_name, uid, gid) |
911 | 087b34fe | Iustin Pop | if mode:
|
912 | 087b34fe | Iustin Pop | os.chmod(new_name, mode) |
913 | 71714516 | Michael Hanselmann | if callable(prewrite): |
914 | 71714516 | Michael Hanselmann | prewrite(fd) |
915 | 087b34fe | Iustin Pop | if data is not None: |
916 | 087b34fe | Iustin Pop | os.write(fd, data) |
917 | 087b34fe | Iustin Pop | else:
|
918 | 087b34fe | Iustin Pop | fn(fd) |
919 | 71714516 | Michael Hanselmann | if callable(postwrite): |
920 | 71714516 | Michael Hanselmann | postwrite(fd) |
921 | 087b34fe | Iustin Pop | os.fsync(fd) |
922 | 087b34fe | Iustin Pop | if atime is not None and mtime is not None: |
923 | 087b34fe | Iustin Pop | os.utime(new_name, (atime, mtime)) |
924 | 70f4497c | Michael Hanselmann | if not dry_run: |
925 | 70f4497c | Michael Hanselmann | os.rename(new_name, file_name) |
926 | 087b34fe | Iustin Pop | finally:
|
927 | 71714516 | Michael Hanselmann | if close:
|
928 | 71714516 | Michael Hanselmann | os.close(fd) |
929 | 71714516 | Michael Hanselmann | result = None
|
930 | 71714516 | Michael Hanselmann | else:
|
931 | 71714516 | Michael Hanselmann | result = fd |
932 | 087b34fe | Iustin Pop | RemoveFile(new_name) |
933 | 78feb6fb | Guido Trotter | |
934 | 71714516 | Michael Hanselmann | return result
|
935 | 71714516 | Michael Hanselmann | |
936 | 78feb6fb | Guido Trotter | |
937 | 7b4126b7 | Iustin Pop | def FirstFree(seq, base=0): |
938 | 7b4126b7 | Iustin Pop | """Returns the first non-existing integer from seq.
|
939 | 7b4126b7 | Iustin Pop |
|
940 | 7b4126b7 | Iustin Pop | The seq argument should be a sorted list of positive integers. The
|
941 | 7b4126b7 | Iustin Pop | first time the index of an element is smaller than the element
|
942 | 7b4126b7 | Iustin Pop | value, the index will be returned.
|
943 | 7b4126b7 | Iustin Pop |
|
944 | 7b4126b7 | Iustin Pop | The base argument is used to start at a different offset,
|
945 | 7b4126b7 | Iustin Pop | i.e. [3, 4, 6] with offset=3 will return 5.
|
946 | 7b4126b7 | Iustin Pop |
|
947 | 7b4126b7 | Iustin Pop | Example: [0, 1, 3] will return 2.
|
948 | 7b4126b7 | Iustin Pop |
|
949 | 7b4126b7 | Iustin Pop | """
|
950 | 7b4126b7 | Iustin Pop | for idx, elem in enumerate(seq): |
951 | 7b4126b7 | Iustin Pop | assert elem >= base, "Passed element is higher than base offset" |
952 | 7b4126b7 | Iustin Pop | if elem > idx + base:
|
953 | 7b4126b7 | Iustin Pop | # idx is not used
|
954 | 7b4126b7 | Iustin Pop | return idx + base
|
955 | 7b4126b7 | Iustin Pop | return None |
956 | 7b4126b7 | Iustin Pop | |
957 | 7b4126b7 | Iustin Pop | |
958 | 78feb6fb | Guido Trotter | def all(seq, pred=bool): |
959 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for every element in the iterable"
|
960 | 78feb6fb | Guido Trotter | for elem in itertools.ifilterfalse(pred, seq): |
961 | 78feb6fb | Guido Trotter | return False |
962 | 78feb6fb | Guido Trotter | return True |
963 | 78feb6fb | Guido Trotter | |
964 | 78feb6fb | Guido Trotter | |
965 | 78feb6fb | Guido Trotter | def any(seq, pred=bool): |
966 | 78feb6fb | Guido Trotter | "Returns True if pred(x) is True for at least one element in the iterable"
|
967 | 78feb6fb | Guido Trotter | for elem in itertools.ifilter(pred, seq): |
968 | 78feb6fb | Guido Trotter | return True |
969 | 78feb6fb | Guido Trotter | return False |
970 | f7414041 | Michael Hanselmann | |
971 | f7414041 | Michael Hanselmann | |
972 | f7414041 | Michael Hanselmann | def UniqueSequence(seq): |
973 | f7414041 | Michael Hanselmann | """Returns a list with unique elements.
|
974 | f7414041 | Michael Hanselmann |
|
975 | f7414041 | Michael Hanselmann | Element order is preserved.
|
976 | f7414041 | Michael Hanselmann | """
|
977 | f7414041 | Michael Hanselmann | seen = set()
|
978 | f7414041 | Michael Hanselmann | return [i for i in seq if i not in seen and not seen.add(i)] |
979 | 1862d460 | Alexander Schreiber | |
980 | 1862d460 | Alexander Schreiber | |
981 | 1862d460 | Alexander Schreiber | def IsValidMac(mac): |
982 | 1862d460 | Alexander Schreiber | """Predicate to check if a MAC address is valid.
|
983 | 1862d460 | Alexander Schreiber |
|
984 | 1862d460 | Alexander Schreiber | Checks wether the supplied MAC address is formally correct, only
|
985 | 1862d460 | Alexander Schreiber | accepts colon separated format.
|
986 | 1862d460 | Alexander Schreiber | """
|
987 | 1862d460 | Alexander Schreiber | mac_check = re.compile("^([0-9a-f]{2}(:|$)){6}$")
|
988 | 1862d460 | Alexander Schreiber | return mac_check.match(mac) is not None |
989 | 06009e27 | Iustin Pop | |
990 | 06009e27 | Iustin Pop | |
991 | 06009e27 | Iustin Pop | def TestDelay(duration): |
992 | 06009e27 | Iustin Pop | """Sleep for a fixed amount of time.
|
993 | 06009e27 | Iustin Pop |
|
994 | 06009e27 | Iustin Pop | """
|
995 | 06009e27 | Iustin Pop | if duration < 0: |
996 | 06009e27 | Iustin Pop | return False |
997 | 06009e27 | Iustin Pop | time.sleep(duration) |
998 | 06009e27 | Iustin Pop | return True |
999 | 8f765069 | Iustin Pop | |
1000 | 8f765069 | Iustin Pop | |
1001 | 8ff612c2 | Iustin Pop | def Daemonize(logfile, noclose_fds=None): |
1002 | 8f765069 | Iustin Pop | """Daemonize the current process.
|
1003 | 8f765069 | Iustin Pop |
|
1004 | 8f765069 | Iustin Pop | This detaches the current process from the controlling terminal and
|
1005 | 8f765069 | Iustin Pop | runs it in the background as a daemon.
|
1006 | 8f765069 | Iustin Pop |
|
1007 | 8f765069 | Iustin Pop | """
|
1008 | 8f765069 | Iustin Pop | UMASK = 077
|
1009 | 8f765069 | Iustin Pop | WORKDIR = "/"
|
1010 | 8f765069 | Iustin Pop | # Default maximum for the number of available file descriptors.
|
1011 | 8f765069 | Iustin Pop | if 'SC_OPEN_MAX' in os.sysconf_names: |
1012 | 8f765069 | Iustin Pop | try:
|
1013 | 8f765069 | Iustin Pop | MAXFD = os.sysconf('SC_OPEN_MAX')
|
1014 | 8f765069 | Iustin Pop | if MAXFD < 0: |
1015 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1016 | 8f765069 | Iustin Pop | except OSError: |
1017 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1018 | 8f765069 | Iustin Pop | else:
|
1019 | 8f765069 | Iustin Pop | MAXFD = 1024
|
1020 | 8f765069 | Iustin Pop | |
1021 | 8f765069 | Iustin Pop | # this might fail
|
1022 | 8f765069 | Iustin Pop | pid = os.fork() |
1023 | 8f765069 | Iustin Pop | if (pid == 0): # The first child. |
1024 | 8f765069 | Iustin Pop | os.setsid() |
1025 | 8f765069 | Iustin Pop | # this might fail
|
1026 | 8f765069 | Iustin Pop | pid = os.fork() # Fork a second child.
|
1027 | 8f765069 | Iustin Pop | if (pid == 0): # The second child. |
1028 | 8f765069 | Iustin Pop | os.chdir(WORKDIR) |
1029 | 8f765069 | Iustin Pop | os.umask(UMASK) |
1030 | 8f765069 | Iustin Pop | else:
|
1031 | 8f765069 | Iustin Pop | # exit() or _exit()? See below.
|
1032 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent (the first child) of the second child. |
1033 | 8f765069 | Iustin Pop | else:
|
1034 | 8f765069 | Iustin Pop | os._exit(0) # Exit parent of the first child. |
1035 | 8f765069 | Iustin Pop | maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
|
1036 | 8f765069 | Iustin Pop | if (maxfd == resource.RLIM_INFINITY):
|
1037 | 8f765069 | Iustin Pop | maxfd = MAXFD |
1038 | 8f765069 | Iustin Pop | |
1039 | 8f765069 | Iustin Pop | # Iterate through and close all file descriptors.
|
1040 | 8f765069 | Iustin Pop | for fd in range(0, maxfd): |
1041 | 8ff612c2 | Iustin Pop | if noclose_fds and fd in noclose_fds: |
1042 | 8ff612c2 | Iustin Pop | continue
|
1043 | 8f765069 | Iustin Pop | try:
|
1044 | 8f765069 | Iustin Pop | os.close(fd) |
1045 | 8f765069 | Iustin Pop | except OSError: # ERROR, fd wasn't open to begin with (ignored) |
1046 | 8f765069 | Iustin Pop | pass
|
1047 | 8f765069 | Iustin Pop | os.open(logfile, os.O_RDWR|os.O_CREAT|os.O_APPEND, 0600)
|
1048 | 8f765069 | Iustin Pop | # Duplicate standard input to standard output and standard error.
|
1049 | 8f765069 | Iustin Pop | os.dup2(0, 1) # standard output (1) |
1050 | 8f765069 | Iustin Pop | os.dup2(0, 2) # standard error (2) |
1051 | 8f765069 | Iustin Pop | return 0 |
1052 | 57c177af | Iustin Pop | |
1053 | 57c177af | Iustin Pop | |
1054 | b330ac0b | Guido Trotter | def _DaemonPidFileName(name): |
1055 | b330ac0b | Guido Trotter | """Compute a ganeti pid file absolute path, given the daemon name.
|
1056 | b330ac0b | Guido Trotter |
|
1057 | b330ac0b | Guido Trotter | """
|
1058 | b330ac0b | Guido Trotter | return os.path.join(constants.RUN_GANETI_DIR, "%s.pid" % name) |
1059 | b330ac0b | Guido Trotter | |
1060 | b330ac0b | Guido Trotter | |
1061 | b330ac0b | Guido Trotter | def WritePidFile(name): |
1062 | b330ac0b | Guido Trotter | """Write the current process pidfile.
|
1063 | b330ac0b | Guido Trotter |
|
1064 | b330ac0b | Guido Trotter | The file will be written to constants.RUN_GANETI_DIR/name.pid
|
1065 | b330ac0b | Guido Trotter |
|
1066 | b330ac0b | Guido Trotter | """
|
1067 | b330ac0b | Guido Trotter | pid = os.getpid() |
1068 | b330ac0b | Guido Trotter | pidfilename = _DaemonPidFileName(name) |
1069 | b330ac0b | Guido Trotter | if IsPidFileAlive(pidfilename):
|
1070 | 533bb4b1 | Michael Hanselmann | raise errors.GenericError("%s contains a live process" % pidfilename) |
1071 | b330ac0b | Guido Trotter | |
1072 | b330ac0b | Guido Trotter | WriteFile(pidfilename, data="%d\n" % pid)
|
1073 | b330ac0b | Guido Trotter | |
1074 | b330ac0b | Guido Trotter | |
1075 | b330ac0b | Guido Trotter | def RemovePidFile(name): |
1076 | b330ac0b | Guido Trotter | """Remove the current process pidfile.
|
1077 | b330ac0b | Guido Trotter |
|
1078 | b330ac0b | Guido Trotter | Any errors are ignored.
|
1079 | b330ac0b | Guido Trotter |
|
1080 | b330ac0b | Guido Trotter | """
|
1081 | b330ac0b | Guido Trotter | pid = os.getpid() |
1082 | b330ac0b | Guido Trotter | pidfilename = _DaemonPidFileName(name) |
1083 | b330ac0b | Guido Trotter | # TODO: we could check here that the file contains our pid
|
1084 | b330ac0b | Guido Trotter | try:
|
1085 | b330ac0b | Guido Trotter | RemoveFile(pidfilename) |
1086 | b330ac0b | Guido Trotter | except:
|
1087 | b330ac0b | Guido Trotter | pass
|
1088 | b330ac0b | Guido Trotter | |
1089 | b330ac0b | Guido Trotter | |
1090 | 57c177af | Iustin Pop | def FindFile(name, search_path, test=os.path.exists): |
1091 | 57c177af | Iustin Pop | """Look for a filesystem object in a given path.
|
1092 | 57c177af | Iustin Pop |
|
1093 | 57c177af | Iustin Pop | This is an abstract method to search for filesystem object (files,
|
1094 | 57c177af | Iustin Pop | dirs) under a given search path.
|
1095 | 57c177af | Iustin Pop |
|
1096 | 57c177af | Iustin Pop | Args:
|
1097 | 57c177af | Iustin Pop | - name: the name to look for
|
1098 | 57c177af | Iustin Pop | - search_path: list of directory names
|
1099 | 57c177af | Iustin Pop | - test: the test which the full path must satisfy
|
1100 | 57c177af | Iustin Pop | (defaults to os.path.exists)
|
1101 | 57c177af | Iustin Pop |
|
1102 | 57c177af | Iustin Pop | Returns:
|
1103 | 57c177af | Iustin Pop | - full path to the item if found
|
1104 | 57c177af | Iustin Pop | - None otherwise
|
1105 | 57c177af | Iustin Pop |
|
1106 | 57c177af | Iustin Pop | """
|
1107 | 57c177af | Iustin Pop | for dir_name in search_path: |
1108 | 57c177af | Iustin Pop | item_name = os.path.sep.join([dir_name, name]) |
1109 | 57c177af | Iustin Pop | if test(item_name):
|
1110 | 57c177af | Iustin Pop | return item_name
|
1111 | 57c177af | Iustin Pop | return None |
1112 | 8d1a2a64 | Michael Hanselmann | |
1113 | 8d1a2a64 | Michael Hanselmann | |
1114 | 8d1a2a64 | Michael Hanselmann | def CheckVolumeGroupSize(vglist, vgname, minsize): |
1115 | 8d1a2a64 | Michael Hanselmann | """Checks if the volume group list is valid.
|
1116 | 8d1a2a64 | Michael Hanselmann |
|
1117 | 8d1a2a64 | Michael Hanselmann | A non-None return value means there's an error, and the return value
|
1118 | 8d1a2a64 | Michael Hanselmann | is the error message.
|
1119 | 8d1a2a64 | Michael Hanselmann |
|
1120 | 8d1a2a64 | Michael Hanselmann | """
|
1121 | 8d1a2a64 | Michael Hanselmann | vgsize = vglist.get(vgname, None)
|
1122 | 8d1a2a64 | Michael Hanselmann | if vgsize is None: |
1123 | 8d1a2a64 | Michael Hanselmann | return "volume group '%s' missing" % vgname |
1124 | 8d1a2a64 | Michael Hanselmann | elif vgsize < minsize:
|
1125 | 8d1a2a64 | Michael Hanselmann | return ("volume group '%s' too small (%s MiB required, %d MiB found)" % |
1126 | 8d1a2a64 | Michael Hanselmann | (vgname, minsize, vgsize)) |
1127 | 8d1a2a64 | Michael Hanselmann | return None |
1128 | 7996a135 | Iustin Pop | |
1129 | 7996a135 | Iustin Pop | |
1130 | 7996a135 | Iustin Pop | def LockedMethod(fn): |
1131 | 7996a135 | Iustin Pop | """Synchronized object access decorator.
|
1132 | 7996a135 | Iustin Pop |
|
1133 | 7996a135 | Iustin Pop | This decorator is intended to protect access to an object using the
|
1134 | 7996a135 | Iustin Pop | object's own lock which is hardcoded to '_lock'.
|
1135 | 7996a135 | Iustin Pop |
|
1136 | 7996a135 | Iustin Pop | """
|
1137 | 7996a135 | Iustin Pop | def wrapper(self, *args, **kwargs): |
1138 | 7996a135 | Iustin Pop | assert hasattr(self, '_lock') |
1139 | 7996a135 | Iustin Pop | lock = self._lock
|
1140 | 7996a135 | Iustin Pop | lock.acquire() |
1141 | 7996a135 | Iustin Pop | try:
|
1142 | 7996a135 | Iustin Pop | result = fn(self, *args, **kwargs)
|
1143 | 7996a135 | Iustin Pop | finally:
|
1144 | 7996a135 | Iustin Pop | lock.release() |
1145 | 7996a135 | Iustin Pop | return result
|
1146 | 7996a135 | Iustin Pop | return wrapper
|
1147 | eb0f0ce0 | Michael Hanselmann | |
1148 | eb0f0ce0 | Michael Hanselmann | |
1149 | eb0f0ce0 | Michael Hanselmann | def LockFile(fd): |
1150 | eb0f0ce0 | Michael Hanselmann | """Locks a file using POSIX locks.
|
1151 | eb0f0ce0 | Michael Hanselmann |
|
1152 | eb0f0ce0 | Michael Hanselmann | """
|
1153 | eb0f0ce0 | Michael Hanselmann | try:
|
1154 | eb0f0ce0 | Michael Hanselmann | fcntl.flock(fd, fcntl.LOCK_EX | fcntl.LOCK_NB) |
1155 | eb0f0ce0 | Michael Hanselmann | except IOError, err: |
1156 | eb0f0ce0 | Michael Hanselmann | if err.errno == errno.EAGAIN:
|
1157 | eb0f0ce0 | Michael Hanselmann | raise errors.LockError("File already locked") |
1158 | eb0f0ce0 | Michael Hanselmann | raise
|
1159 | de499029 | Michael Hanselmann | |
1160 | de499029 | Michael Hanselmann | |
1161 | de499029 | Michael Hanselmann | class SignalHandler(object): |
1162 | de499029 | Michael Hanselmann | """Generic signal handler class.
|
1163 | de499029 | Michael Hanselmann |
|
1164 | de499029 | Michael Hanselmann | It automatically restores the original handler when deconstructed or when
|
1165 | de499029 | Michael Hanselmann | Reset() is called. You can either pass your own handler function in or query
|
1166 | de499029 | Michael Hanselmann | the "called" attribute to detect whether the signal was sent.
|
1167 | de499029 | Michael Hanselmann |
|
1168 | de499029 | Michael Hanselmann | """
|
1169 | de499029 | Michael Hanselmann | def __init__(self, signum): |
1170 | de499029 | Michael Hanselmann | """Constructs a new SignalHandler instance.
|
1171 | de499029 | Michael Hanselmann |
|
1172 | de499029 | Michael Hanselmann | @param signum: Single signal number or set of signal numbers
|
1173 | de499029 | Michael Hanselmann |
|
1174 | de499029 | Michael Hanselmann | """
|
1175 | de499029 | Michael Hanselmann | if isinstance(signum, (int, long)): |
1176 | de499029 | Michael Hanselmann | self.signum = set([signum]) |
1177 | de499029 | Michael Hanselmann | else:
|
1178 | de499029 | Michael Hanselmann | self.signum = set(signum) |
1179 | de499029 | Michael Hanselmann | |
1180 | de499029 | Michael Hanselmann | self.called = False |
1181 | de499029 | Michael Hanselmann | |
1182 | de499029 | Michael Hanselmann | self._previous = {}
|
1183 | de499029 | Michael Hanselmann | try:
|
1184 | de499029 | Michael Hanselmann | for signum in self.signum: |
1185 | de499029 | Michael Hanselmann | # Setup handler
|
1186 | de499029 | Michael Hanselmann | prev_handler = signal.signal(signum, self._HandleSignal)
|
1187 | de499029 | Michael Hanselmann | try:
|
1188 | de499029 | Michael Hanselmann | self._previous[signum] = prev_handler
|
1189 | de499029 | Michael Hanselmann | except:
|
1190 | de499029 | Michael Hanselmann | # Restore previous handler
|
1191 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
1192 | de499029 | Michael Hanselmann | raise
|
1193 | de499029 | Michael Hanselmann | except:
|
1194 | de499029 | Michael Hanselmann | # Reset all handlers
|
1195 | de499029 | Michael Hanselmann | self.Reset()
|
1196 | de499029 | Michael Hanselmann | # Here we have a race condition: a handler may have already been called,
|
1197 | de499029 | Michael Hanselmann | # but there's not much we can do about it at this point.
|
1198 | de499029 | Michael Hanselmann | raise
|
1199 | de499029 | Michael Hanselmann | |
1200 | de499029 | Michael Hanselmann | def __del__(self): |
1201 | de499029 | Michael Hanselmann | self.Reset()
|
1202 | de499029 | Michael Hanselmann | |
1203 | de499029 | Michael Hanselmann | def Reset(self): |
1204 | de499029 | Michael Hanselmann | """Restore previous handler.
|
1205 | de499029 | Michael Hanselmann |
|
1206 | de499029 | Michael Hanselmann | """
|
1207 | de499029 | Michael Hanselmann | for signum, prev_handler in self._previous.items(): |
1208 | de499029 | Michael Hanselmann | signal.signal(signum, prev_handler) |
1209 | de499029 | Michael Hanselmann | # If successful, remove from dict
|
1210 | de499029 | Michael Hanselmann | del self._previous[signum] |
1211 | de499029 | Michael Hanselmann | |
1212 | de499029 | Michael Hanselmann | def Clear(self): |
1213 | de499029 | Michael Hanselmann | """Unsets "called" flag.
|
1214 | de499029 | Michael Hanselmann |
|
1215 | de499029 | Michael Hanselmann | This function can be used in case a signal may arrive several times.
|
1216 | de499029 | Michael Hanselmann |
|
1217 | de499029 | Michael Hanselmann | """
|
1218 | de499029 | Michael Hanselmann | self.called = False |
1219 | de499029 | Michael Hanselmann | |
1220 | de499029 | Michael Hanselmann | def _HandleSignal(self, signum, frame): |
1221 | de499029 | Michael Hanselmann | """Actual signal handling function.
|
1222 | de499029 | Michael Hanselmann |
|
1223 | de499029 | Michael Hanselmann | """
|
1224 | de499029 | Michael Hanselmann | # This is not nice and not absolutely atomic, but it appears to be the only
|
1225 | de499029 | Michael Hanselmann | # solution in Python -- there are no atomic types.
|
1226 | de499029 | Michael Hanselmann | self.called = True |