Mercurial > hg
annotate hgext/fsmonitor/state.py @ 43076:2372284d9457
formatting: blacken the codebase
This is using my patch to black
(https://github.com/psf/black/pull/826) so we don't un-wrap collection
literals.
Done with:
hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S
# skip-blame mass-reformatting only
# no-check-commit reformats foo_bar functions
Differential Revision: https://phab.mercurial-scm.org/D6971
author | Augie Fackler <augie@google.com> |
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date | Sun, 06 Oct 2019 09:45:02 -0400 |
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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 |
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25 class state(object): |
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26 def __init__(self, repo): |
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27 self._vfs = repo.vfs |
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28 self._ui = repo.ui |
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29 self._rootdir = pathutil.normasprefix(repo.root) |
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30 self._lastclock = None |
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31 self._identity = util.filestat(None) |
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32 |
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33 self.mode = self._ui.config('fsmonitor', 'mode') |
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34 self.walk_on_invalidate = self._ui.configbool( |
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35 'fsmonitor', 'walk_on_invalidate' |
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36 ) |
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37 self.timeout = float(self._ui.config('fsmonitor', 'timeout')) |
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38 |
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39 def get(self): |
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40 try: |
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41 file = self._vfs('fsmonitor.state', 'rb') |
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42 except IOError as inst: |
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43 self._identity = util.filestat(None) |
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44 if inst.errno != errno.ENOENT: |
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45 raise |
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46 return None, None, None |
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47 |
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48 self._identity = util.filestat.fromfp(file) |
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49 |
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50 versionbytes = file.read(4) |
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51 if len(versionbytes) < 4: |
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52 self._ui.log( |
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53 'fsmonitor', |
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54 'fsmonitor: state file only has %d bytes, ' |
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55 'nuking state\n' % len(versionbytes), |
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56 ) |
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57 self.invalidate() |
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58 return None, None, None |
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59 try: |
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60 diskversion = struct.unpack(_versionformat, versionbytes)[0] |
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61 if diskversion != _version: |
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62 # different version, nuke state and start over |
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63 self._ui.log( |
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64 'fsmonitor', |
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65 'fsmonitor: version switch from %d to ' |
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66 '%d, nuking state\n' % (diskversion, _version), |
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67 ) |
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68 self.invalidate() |
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69 return None, None, None |
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70 |
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71 state = file.read().split('\0') |
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72 # state = hostname\0clock\0ignorehash\0 + list of files, each |
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73 # followed by a \0 |
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74 if len(state) < 3: |
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75 self._ui.log( |
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76 'fsmonitor', |
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77 'fsmonitor: state file truncated (expected ' |
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78 '3 chunks, found %d), nuking state\n', |
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79 len(state), |
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80 ) |
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81 self.invalidate() |
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82 return None, None, None |
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83 diskhostname = state[0] |
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84 hostname = socket.gethostname() |
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85 if diskhostname != hostname: |
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86 # file got moved to a different host |
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87 self._ui.log( |
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88 'fsmonitor', |
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89 'fsmonitor: stored hostname "%s" ' |
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90 'different from current "%s", nuking state\n' |
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91 % (diskhostname, hostname), |
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92 ) |
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93 self.invalidate() |
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94 return None, None, None |
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95 |
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96 clock = state[1] |
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97 ignorehash = state[2] |
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98 # discard the value after the last \0 |
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99 notefiles = state[3:-1] |
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100 |
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101 finally: |
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102 file.close() |
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103 |
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104 return clock, ignorehash, notefiles |
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105 |
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106 def set(self, clock, ignorehash, notefiles): |
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107 if clock is None: |
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108 self.invalidate() |
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109 return |
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110 |
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111 # Read the identity from the file on disk rather than from the open file |
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112 # pointer below, because the latter is actually a brand new file. |
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113 identity = util.filestat.frompath(self._vfs.join('fsmonitor.state')) |
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114 if identity != self._identity: |
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115 self._ui.debug('skip updating fsmonitor.state: identity mismatch\n') |
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116 return |
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117 |
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118 try: |
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119 file = self._vfs( |
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120 'fsmonitor.state', 'wb', atomictemp=True, checkambig=True |
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121 ) |
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122 except (IOError, OSError): |
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123 self._ui.warn(_("warning: unable to write out fsmonitor state\n")) |
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124 return |
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125 |
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126 with file: |
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127 file.write(struct.pack(_versionformat, _version)) |
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128 file.write(socket.gethostname() + '\0') |
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129 file.write(clock + '\0') |
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130 file.write(ignorehash + '\0') |
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131 if notefiles: |
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132 file.write('\0'.join(notefiles)) |
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133 file.write('\0') |
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134 |
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135 def invalidate(self): |
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136 try: |
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137 os.unlink(os.path.join(self._rootdir, '.hg', 'fsmonitor.state')) |
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138 except OSError as inst: |
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139 if inst.errno != errno.ENOENT: |
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140 raise |
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fsmonitor: don't write out state if identity has changed (issue5581)
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141 self._identity = util.filestat(None) |
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142 |
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143 def setlastclock(self, clock): |
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144 self._lastclock = clock |
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145 |
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146 def getlastclock(self): |
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147 return self._lastclock |