Mercurial > hg
annotate hgext/fsmonitor/state.py @ 32816:1b25c648d5b7
fsmonitor: don't write out state if identity has changed (issue5581)
Inspired by the dirstate fix in dc7efa2826e4, this should fix any race
conditions with the fsmonitor state changing from underneath.
Since we now grab the wlock for any non-invalidate writes, the only situation
this appears to happen in is with a concurrent invalidation. Test that.
author | Siddharth Agarwal <sid0@fb.com> |
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date | Mon, 12 Jun 2017 15:34:31 -0700 |
parents | 15c998528c36 |
children | 718f7acd6d5e |
rev | line source |
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1 # state.py - fsmonitor persistent state |
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2 # |
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3 # Copyright 2013-2016 Facebook, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import errno |
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11 import os |
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12 import socket |
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13 import struct |
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14 |
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15 from mercurial.i18n import _ |
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16 from mercurial import ( |
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17 pathutil, |
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18 util, |
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19 ) |
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20 |
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21 _version = 4 |
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22 _versionformat = ">I" |
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23 |
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24 class state(object): |
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25 def __init__(self, repo): |
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26 self._vfs = repo.vfs |
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27 self._ui = repo.ui |
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28 self._rootdir = pathutil.normasprefix(repo.root) |
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29 self._lastclock = None |
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30 self._identity = util.filestat(None) |
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31 |
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32 self.mode = self._ui.config('fsmonitor', 'mode', default='on') |
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33 self.walk_on_invalidate = self._ui.configbool( |
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34 'fsmonitor', 'walk_on_invalidate', False) |
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35 self.timeout = float(self._ui.config( |
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36 'fsmonitor', 'timeout', default='2')) |
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37 |
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38 def get(self): |
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39 try: |
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40 file = self._vfs('fsmonitor.state', 'rb') |
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41 except IOError as inst: |
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42 self._identity = util.filestat(None) |
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43 if inst.errno != errno.ENOENT: |
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44 raise |
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45 return None, None, None |
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46 |
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47 self._identity = util.filestat.fromfp(file) |
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48 |
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49 versionbytes = file.read(4) |
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50 if len(versionbytes) < 4: |
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51 self._ui.log( |
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52 'fsmonitor', 'fsmonitor: state file only has %d bytes, ' |
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53 'nuking state\n' % len(versionbytes)) |
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54 self.invalidate() |
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55 return None, None, None |
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56 try: |
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57 diskversion = struct.unpack(_versionformat, versionbytes)[0] |
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58 if diskversion != _version: |
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59 # different version, nuke state and start over |
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60 self._ui.log( |
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61 'fsmonitor', 'fsmonitor: version switch from %d to ' |
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62 '%d, nuking state\n' % (diskversion, _version)) |
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63 self.invalidate() |
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64 return None, None, None |
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65 |
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66 state = file.read().split('\0') |
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67 # state = hostname\0clock\0ignorehash\0 + list of files, each |
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68 # followed by a \0 |
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69 if len(state) < 3: |
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70 self._ui.log( |
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71 'fsmonitor', 'fsmonitor: state file truncated (expected ' |
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72 '3 chunks, found %d), nuking state\n', len(state)) |
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73 self.invalidate() |
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74 return None, None, None |
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75 diskhostname = state[0] |
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76 hostname = socket.gethostname() |
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77 if diskhostname != hostname: |
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78 # file got moved to a different host |
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79 self._ui.log('fsmonitor', 'fsmonitor: stored hostname "%s" ' |
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80 'different from current "%s", nuking state\n' % |
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81 (diskhostname, hostname)) |
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82 self.invalidate() |
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83 return None, None, None |
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84 |
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85 clock = state[1] |
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86 ignorehash = state[2] |
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87 # discard the value after the last \0 |
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88 notefiles = state[3:-1] |
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89 |
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90 finally: |
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91 file.close() |
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92 |
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93 return clock, ignorehash, notefiles |
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94 |
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95 def set(self, clock, ignorehash, notefiles): |
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96 if clock is None: |
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97 self.invalidate() |
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98 return |
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99 |
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100 # Read the identity from the file on disk rather than from the open file |
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101 # pointer below, because the latter is actually a brand new file. |
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102 identity = util.filestat.frompath(self._vfs.join('fsmonitor.state')) |
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103 if identity != self._identity: |
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104 self._ui.debug('skip updating fsmonitor.state: identity mismatch\n') |
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105 return |
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106 |
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107 try: |
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108 file = self._vfs('fsmonitor.state', 'wb', atomictemp=True, |
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109 checkambig=True) |
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110 except (IOError, OSError): |
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111 self._ui.warn(_("warning: unable to write out fsmonitor state\n")) |
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112 return |
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113 |
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114 with file: |
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115 file.write(struct.pack(_versionformat, _version)) |
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116 file.write(socket.gethostname() + '\0') |
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117 file.write(clock + '\0') |
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118 file.write(ignorehash + '\0') |
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119 if notefiles: |
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120 file.write('\0'.join(notefiles)) |
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121 file.write('\0') |
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122 |
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123 def invalidate(self): |
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124 try: |
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125 os.unlink(os.path.join(self._rootdir, '.hg', 'fsmonitor.state')) |
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126 except OSError as inst: |
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127 if inst.errno != errno.ENOENT: |
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128 raise |
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129 self._identity = util.filestat(None) |
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130 |
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131 def setlastclock(self, clock): |
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132 self._lastclock = clock |
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133 |
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134 def getlastclock(self): |
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135 return self._lastclock |