Mercurial > hg
annotate hgext/fsmonitor/state.py @ 45613:ddcee0b0fd67
changing-files: add a utility to compute the merged files post-commit
We will need it in `_getsidedata` as soon as we start persisting that set.
Differential Revision: https://phab.mercurial-scm.org/D9089
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 25 Sep 2020 11:29:19 +0200 |
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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 encoding, |
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18 pathutil, |
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19 util, |
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20 ) |
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21 |
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22 _version = 4 |
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23 _versionformat = b">I" |
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24 |
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25 |
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26 class state(object): |
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27 def __init__(self, repo): |
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28 self._vfs = repo.vfs |
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29 self._ui = repo.ui |
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30 self._rootdir = pathutil.normasprefix(repo.root) |
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31 self._lastclock = None |
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32 self._identity = util.filestat(None) |
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33 |
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34 self.mode = self._ui.config(b'fsmonitor', b'mode') |
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35 self.walk_on_invalidate = self._ui.configbool( |
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36 b'fsmonitor', b'walk_on_invalidate' |
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37 ) |
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38 self.timeout = float(self._ui.config(b'fsmonitor', b'timeout')) |
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39 |
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40 def get(self): |
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41 try: |
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42 file = self._vfs(b'fsmonitor.state', b'rb') |
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43 except IOError as inst: |
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44 self._identity = util.filestat(None) |
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45 if inst.errno != errno.ENOENT: |
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46 raise |
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47 return None, None, None |
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48 |
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49 self._identity = util.filestat.fromfp(file) |
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50 |
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51 versionbytes = file.read(4) |
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52 if len(versionbytes) < 4: |
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53 self._ui.log( |
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54 b'fsmonitor', |
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55 b'fsmonitor: state file only has %d bytes, ' |
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56 b'nuking state\n' % len(versionbytes), |
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57 ) |
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58 self.invalidate() |
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59 return None, None, None |
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60 try: |
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61 diskversion = struct.unpack(_versionformat, versionbytes)[0] |
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62 if diskversion != _version: |
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63 # different version, nuke state and start over |
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64 self._ui.log( |
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65 b'fsmonitor', |
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66 b'fsmonitor: version switch from %d to ' |
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67 b'%d, nuking state\n' % (diskversion, _version), |
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68 ) |
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69 self.invalidate() |
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70 return None, None, None |
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71 |
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72 state = file.read().split(b'\0') |
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73 # state = hostname\0clock\0ignorehash\0 + list of files, each |
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74 # followed by a \0 |
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75 if len(state) < 3: |
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76 self._ui.log( |
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77 b'fsmonitor', |
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78 b'fsmonitor: state file truncated (expected ' |
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79 b'3 chunks, found %d), nuking state\n', |
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80 len(state), |
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81 ) |
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82 self.invalidate() |
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83 return None, None, None |
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84 diskhostname = state[0] |
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85 hostname = encoding.strtolocal(socket.gethostname()) |
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86 if diskhostname != hostname: |
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87 # file got moved to a different host |
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88 self._ui.log( |
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89 b'fsmonitor', |
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90 b'fsmonitor: stored hostname "%s" ' |
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91 b'different from current "%s", nuking state\n' |
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92 % (diskhostname, hostname), |
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93 ) |
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94 self.invalidate() |
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95 return None, None, None |
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96 |
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97 clock = state[1] |
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98 ignorehash = state[2] |
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99 # discard the value after the last \0 |
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100 notefiles = state[3:-1] |
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101 |
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102 finally: |
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103 file.close() |
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104 |
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105 return clock, ignorehash, notefiles |
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106 |
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107 def set(self, clock, ignorehash, notefiles): |
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108 if clock is None: |
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109 self.invalidate() |
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110 return |
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111 |
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112 # Read the identity from the file on disk rather than from the open file |
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113 # pointer below, because the latter is actually a brand new file. |
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114 identity = util.filestat.frompath(self._vfs.join(b'fsmonitor.state')) |
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115 if identity != self._identity: |
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116 self._ui.debug( |
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117 b'skip updating fsmonitor.state: identity mismatch\n' |
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118 ) |
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119 return |
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120 |
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121 try: |
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122 file = self._vfs( |
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123 b'fsmonitor.state', b'wb', atomictemp=True, checkambig=True |
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124 ) |
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125 except (IOError, OSError): |
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126 self._ui.warn(_(b"warning: unable to write out fsmonitor state\n")) |
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127 return |
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128 |
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129 with file: |
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130 file.write(struct.pack(_versionformat, _version)) |
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131 file.write(encoding.strtolocal(socket.gethostname()) + b'\0') |
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132 file.write(clock + b'\0') |
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133 file.write(ignorehash + b'\0') |
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134 if notefiles: |
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135 file.write(b'\0'.join(notefiles)) |
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136 file.write(b'\0') |
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137 |
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138 def invalidate(self): |
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139 try: |
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140 os.unlink(os.path.join(self._rootdir, b'.hg', b'fsmonitor.state')) |
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141 except OSError as inst: |
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142 if inst.errno != errno.ENOENT: |
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143 raise |
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144 self._identity = util.filestat(None) |
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145 |
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146 def setlastclock(self, clock): |
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147 self._lastclock = clock |
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148 |
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149 def getlastclock(self): |
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150 return self._lastclock |