Mercurial > hg
annotate hgext/journal.py @ 46540:311a18777f45
test-copies: improve description of the B+C "revert/restore" case
This will make its role clearer.
Differential Revision: https://phab.mercurial-scm.org/D10044
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 16 Feb 2021 05:58:22 +0100 |
parents | 59fa3890d40a |
children | d55b71393907 |
rev | line source |
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1 # journal.py |
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2 # |
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3 # Copyright 2014-2016 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 """track previous positions of bookmarks (EXPERIMENTAL) |
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8 |
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9 This extension adds a new command: `hg journal`, which shows you where |
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10 bookmarks were previously located. |
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11 |
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12 """ |
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13 |
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14 from __future__ import absolute_import |
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15 |
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16 import collections |
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17 import errno |
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18 import os |
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19 import weakref |
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20 |
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21 from mercurial.i18n import _ |
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22 from mercurial.node import ( |
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23 bin, |
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24 hex, |
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25 nullid, |
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26 ) |
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27 |
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28 from mercurial import ( |
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29 bookmarks, |
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30 cmdutil, |
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31 dispatch, |
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32 encoding, |
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33 error, |
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34 extensions, |
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35 hg, |
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36 localrepo, |
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37 lock, |
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38 logcmdutil, |
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39 pycompat, |
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40 registrar, |
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41 util, |
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42 ) |
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43 from mercurial.utils import ( |
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44 dateutil, |
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45 procutil, |
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46 stringutil, |
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47 ) |
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48 |
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49 cmdtable = {} |
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50 command = registrar.command(cmdtable) |
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51 |
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52 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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53 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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54 # be specifying the version(s) of Mercurial they are tested with, or |
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55 # leave the attribute unspecified. |
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56 testedwith = b'ships-with-hg-core' |
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57 |
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58 # storage format version; increment when the format changes |
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59 storageversion = 0 |
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60 |
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61 # namespaces |
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62 bookmarktype = b'bookmark' |
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63 wdirparenttype = b'wdirparent' |
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64 # In a shared repository, what shared feature name is used |
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65 # to indicate this namespace is shared with the source? |
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66 sharednamespaces = { |
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67 bookmarktype: hg.sharedbookmarks, |
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68 } |
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69 |
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70 # Journal recording, register hooks and storage object |
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71 def extsetup(ui): |
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72 extensions.wrapfunction(dispatch, b'runcommand', runcommand) |
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73 extensions.wrapfunction(bookmarks.bmstore, b'_write', recordbookmarks) |
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74 extensions.wrapfilecache( |
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75 localrepo.localrepository, b'dirstate', wrapdirstate |
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76 ) |
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77 extensions.wrapfunction(hg, b'postshare', wrappostshare) |
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78 extensions.wrapfunction(hg, b'copystore', unsharejournal) |
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79 |
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80 |
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81 def reposetup(ui, repo): |
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82 if repo.local(): |
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83 repo.journal = journalstorage(repo) |
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84 repo._wlockfreeprefix.add(b'namejournal') |
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85 |
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86 dirstate, cached = localrepo.isfilecached(repo, b'dirstate') |
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87 if cached: |
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88 # already instantiated dirstate isn't yet marked as |
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89 # "journal"-ing, even though repo.dirstate() was already |
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90 # wrapped by own wrapdirstate() |
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91 _setupdirstate(repo, dirstate) |
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92 |
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93 |
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94 def runcommand(orig, lui, repo, cmd, fullargs, *args): |
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95 """Track the command line options for recording in the journal""" |
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96 journalstorage.recordcommand(*fullargs) |
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97 return orig(lui, repo, cmd, fullargs, *args) |
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98 |
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99 |
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100 def _setupdirstate(repo, dirstate): |
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101 dirstate.journalstorage = repo.journal |
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102 dirstate.addparentchangecallback(b'journal', recorddirstateparents) |
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103 |
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104 |
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105 # hooks to record dirstate changes |
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106 def wrapdirstate(orig, repo): |
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107 """Make journal storage available to the dirstate object""" |
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108 dirstate = orig(repo) |
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109 if util.safehasattr(repo, 'journal'): |
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110 _setupdirstate(repo, dirstate) |
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111 return dirstate |
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112 |
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113 |
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114 def recorddirstateparents(dirstate, old, new): |
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115 """Records all dirstate parent changes in the journal.""" |
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116 old = list(old) |
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117 new = list(new) |
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118 if util.safehasattr(dirstate, 'journalstorage'): |
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119 # only record two hashes if there was a merge |
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120 oldhashes = old[:1] if old[1] == nullid else old |
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121 newhashes = new[:1] if new[1] == nullid else new |
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122 dirstate.journalstorage.record( |
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123 wdirparenttype, b'.', oldhashes, newhashes |
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124 ) |
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125 |
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126 |
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127 # hooks to record bookmark changes (both local and remote) |
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128 def recordbookmarks(orig, store, fp): |
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129 """Records all bookmark changes in the journal.""" |
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130 repo = store._repo |
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131 if util.safehasattr(repo, 'journal'): |
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132 oldmarks = bookmarks.bmstore(repo) |
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133 for mark, value in pycompat.iteritems(store): |
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134 oldvalue = oldmarks.get(mark, nullid) |
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135 if value != oldvalue: |
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136 repo.journal.record(bookmarktype, mark, oldvalue, value) |
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137 return orig(store, fp) |
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138 |
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139 |
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140 # shared repository support |
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141 def _readsharedfeatures(repo): |
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142 """A set of shared features for this repository""" |
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143 try: |
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144 return set(repo.vfs.read(b'shared').splitlines()) |
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145 except IOError as inst: |
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146 if inst.errno != errno.ENOENT: |
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147 raise |
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148 return set() |
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149 |
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150 |
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151 def _mergeentriesiter(*iterables, **kwargs): |
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152 """Given a set of sorted iterables, yield the next entry in merged order |
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153 |
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154 Note that by default entries go from most recent to oldest. |
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155 """ |
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156 order = kwargs.pop('order', max) |
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157 iterables = [iter(it) for it in iterables] |
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158 # this tracks still active iterables; iterables are deleted as they are |
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159 # exhausted, which is why this is a dictionary and why each entry also |
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160 # stores the key. Entries are mutable so we can store the next value each |
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161 # time. |
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162 iterable_map = {} |
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163 for key, it in enumerate(iterables): |
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164 try: |
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165 iterable_map[key] = [next(it), key, it] |
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166 except StopIteration: |
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167 # empty entry, can be ignored |
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168 pass |
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169 |
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170 while iterable_map: |
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171 value, key, it = order(pycompat.itervalues(iterable_map)) |
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172 yield value |
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173 try: |
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174 iterable_map[key][0] = next(it) |
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175 except StopIteration: |
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176 # this iterable is empty, remove it from consideration |
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177 del iterable_map[key] |
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178 |
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179 |
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180 def wrappostshare(orig, sourcerepo, destrepo, **kwargs): |
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181 """Mark this shared working copy as sharing journal information""" |
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182 with destrepo.wlock(): |
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183 orig(sourcerepo, destrepo, **kwargs) |
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184 with destrepo.vfs(b'shared', b'a') as fp: |
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185 fp.write(b'journal\n') |
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186 |
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187 |
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188 def unsharejournal(orig, ui, repo, repopath): |
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189 """Copy shared journal entries into this repo when unsharing""" |
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190 if ( |
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191 repo.path == repopath |
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192 and repo.shared() |
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193 and util.safehasattr(repo, 'journal') |
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194 ): |
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195 sharedrepo = hg.sharedreposource(repo) |
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196 sharedfeatures = _readsharedfeatures(repo) |
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197 if sharedrepo and sharedfeatures > {b'journal'}: |
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198 # there is a shared repository and there are shared journal entries |
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199 # to copy. move shared date over from source to destination but |
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200 # move the local file first |
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201 if repo.vfs.exists(b'namejournal'): |
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202 journalpath = repo.vfs.join(b'namejournal') |
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203 util.rename(journalpath, journalpath + b'.bak') |
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204 storage = repo.journal |
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205 local = storage._open( |
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206 repo.vfs, filename=b'namejournal.bak', _newestfirst=False |
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207 ) |
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208 shared = ( |
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209 e |
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210 for e in storage._open(sharedrepo.vfs, _newestfirst=False) |
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211 if sharednamespaces.get(e.namespace) in sharedfeatures |
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212 ) |
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213 for entry in _mergeentriesiter(local, shared, order=min): |
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214 storage._write(repo.vfs, entry) |
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215 |
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216 return orig(ui, repo, repopath) |
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217 |
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218 |
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219 class journalentry( |
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220 collections.namedtuple( |
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221 'journalentry', |
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222 'timestamp user command namespace name oldhashes newhashes', |
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223 ) |
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224 ): |
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225 """Individual journal entry |
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226 |
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227 * timestamp: a mercurial (time, timezone) tuple |
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228 * user: the username that ran the command |
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229 * namespace: the entry namespace, an opaque string |
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230 * name: the name of the changed item, opaque string with meaning in the |
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231 namespace |
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232 * command: the hg command that triggered this record |
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233 * oldhashes: a tuple of one or more binary hashes for the old location |
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234 * newhashes: a tuple of one or more binary hashes for the new location |
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235 |
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236 Handles serialisation from and to the storage format. Fields are |
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237 separated by newlines, hashes are written out in hex separated by commas, |
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238 timestamp and timezone are separated by a space. |
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239 |
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240 """ |
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241 |
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242 @classmethod |
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243 def fromstorage(cls, line): |
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244 ( |
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245 time, |
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246 user, |
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247 command, |
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248 namespace, |
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249 name, |
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250 oldhashes, |
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251 newhashes, |
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252 ) = line.split(b'\n') |
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253 timestamp, tz = time.split() |
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254 timestamp, tz = float(timestamp), int(tz) |
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255 oldhashes = tuple(bin(hash) for hash in oldhashes.split(b',')) |
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256 newhashes = tuple(bin(hash) for hash in newhashes.split(b',')) |
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257 return cls( |
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258 (timestamp, tz), |
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259 user, |
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260 command, |
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261 namespace, |
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262 name, |
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263 oldhashes, |
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264 newhashes, |
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265 ) |
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266 |
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267 def __bytes__(self): |
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268 """bytes representation for storage""" |
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269 time = b' '.join(map(pycompat.bytestr, self.timestamp)) |
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270 oldhashes = b','.join([hex(hash) for hash in self.oldhashes]) |
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271 newhashes = b','.join([hex(hash) for hash in self.newhashes]) |
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272 return b'\n'.join( |
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273 ( |
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274 time, |
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275 self.user, |
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276 self.command, |
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277 self.namespace, |
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278 self.name, |
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279 oldhashes, |
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280 newhashes, |
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281 ) |
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282 ) |
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283 |
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284 __str__ = encoding.strmethod(__bytes__) |
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285 |
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286 |
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287 class journalstorage(object): |
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288 """Storage for journal entries |
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289 |
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290 Entries are divided over two files; one with entries that pertain to the |
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291 local working copy *only*, and one with entries that are shared across |
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292 multiple working copies when shared using the share extension. |
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293 |
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294 Entries are stored with NUL bytes as separators. See the journalentry |
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295 class for the per-entry structure. |
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296 |
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297 The file format starts with an integer version, delimited by a NUL. |
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298 |
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299 This storage uses a dedicated lock; this makes it easier to avoid issues |
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300 with adding entries that added when the regular wlock is unlocked (e.g. |
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301 the dirstate). |
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302 |
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303 """ |
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304 |
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305 _currentcommand = () |
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306 _lockref = None |
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307 |
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308 def __init__(self, repo): |
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309 self.user = procutil.getuser() |
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310 self.ui = repo.ui |
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311 self.vfs = repo.vfs |
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312 |
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313 # is this working copy using a shared storage? |
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314 self.sharedfeatures = self.sharedvfs = None |
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315 if repo.shared(): |
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316 features = _readsharedfeatures(repo) |
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317 sharedrepo = hg.sharedreposource(repo) |
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318 if sharedrepo is not None and b'journal' in features: |
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319 self.sharedvfs = sharedrepo.vfs |
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320 self.sharedfeatures = features |
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321 |
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322 # track the current command for recording in journal entries |
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323 @property |
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324 def command(self): |
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325 commandstr = b' '.join( |
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326 map(procutil.shellquote, journalstorage._currentcommand) |
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327 ) |
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328 if b'\n' in commandstr: |
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329 # truncate multi-line commands |
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330 commandstr = commandstr.partition(b'\n')[0] + b' ...' |
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331 return commandstr |
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332 |
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333 @classmethod |
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334 def recordcommand(cls, *fullargs): |
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335 """Set the current hg arguments, stored with recorded entries""" |
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336 # Set the current command on the class because we may have started |
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337 # with a non-local repo (cloning for example). |
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338 cls._currentcommand = fullargs |
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339 |
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340 def _currentlock(self, lockref): |
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341 """Returns the lock if it's held, or None if it's not. |
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342 |
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343 (This is copied from the localrepo class) |
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344 """ |
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345 if lockref is None: |
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346 return None |
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347 l = lockref() |
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348 if l is None or not l.held: |
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349 return None |
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350 return l |
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351 |
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352 def jlock(self, vfs): |
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353 """Create a lock for the journal file""" |
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354 if self._currentlock(self._lockref) is not None: |
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355 raise error.Abort(_(b'journal lock does not support nesting')) |
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356 desc = _(b'journal of %s') % vfs.base |
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357 try: |
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358 l = lock.lock(vfs, b'namejournal.lock', 0, desc=desc) |
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359 except error.LockHeld as inst: |
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360 self.ui.warn( |
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361 _(b"waiting for lock on %s held by %r\n") % (desc, inst.locker) |
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362 ) |
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363 # default to 600 seconds timeout |
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364 l = lock.lock( |
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365 vfs, |
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366 b'namejournal.lock', |
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367 self.ui.configint(b"ui", b"timeout"), |
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368 desc=desc, |
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369 ) |
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370 self.ui.warn(_(b"got lock after %s seconds\n") % l.delay) |
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371 self._lockref = weakref.ref(l) |
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372 return l |
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373 |
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374 def record(self, namespace, name, oldhashes, newhashes): |
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375 """Record a new journal entry |
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376 |
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377 * namespace: an opaque string; this can be used to filter on the type |
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378 of recorded entries. |
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379 * name: the name defining this entry; for bookmarks, this is the |
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380 bookmark name. Can be filtered on when retrieving entries. |
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381 * oldhashes and newhashes: each a single binary hash, or a list of |
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382 binary hashes. These represent the old and new position of the named |
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383 item. |
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384 |
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385 """ |
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386 if not isinstance(oldhashes, list): |
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387 oldhashes = [oldhashes] |
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388 if not isinstance(newhashes, list): |
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389 newhashes = [newhashes] |
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390 |
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391 entry = journalentry( |
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392 dateutil.makedate(), |
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393 self.user, |
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394 self.command, |
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395 namespace, |
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396 name, |
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397 oldhashes, |
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398 newhashes, |
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399 ) |
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400 |
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401 vfs = self.vfs |
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402 if self.sharedvfs is not None: |
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403 # write to the shared repository if this feature is being |
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404 # shared between working copies. |
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405 if sharednamespaces.get(namespace) in self.sharedfeatures: |
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406 vfs = self.sharedvfs |
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407 |
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408 self._write(vfs, entry) |
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409 |
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410 def _write(self, vfs, entry): |
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411 with self.jlock(vfs): |
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412 # open file in amend mode to ensure it is created if missing |
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413 with vfs(b'namejournal', mode=b'a+b') as f: |
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414 f.seek(0, os.SEEK_SET) |
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415 # Read just enough bytes to get a version number (up to 2 |
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416 # digits plus separator) |
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417 version = f.read(3).partition(b'\0')[0] |
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418 if version and version != b"%d" % storageversion: |
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419 # different version of the storage. Exit early (and not |
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420 # write anything) if this is not a version we can handle or |
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421 # the file is corrupt. In future, perhaps rotate the file |
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422 # instead? |
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423 self.ui.warn( |
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424 _(b"unsupported journal file version '%s'\n") % version |
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425 ) |
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426 return |
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427 if not version: |
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428 # empty file, write version first |
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429 f.write((b"%d" % storageversion) + b'\0') |
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430 f.seek(0, os.SEEK_END) |
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431 f.write(bytes(entry) + b'\0') |
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432 |
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433 def filtered(self, namespace=None, name=None): |
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434 """Yield all journal entries with the given namespace or name |
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435 |
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436 Both the namespace and the name are optional; if neither is given all |
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437 entries in the journal are produced. |
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438 |
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439 Matching supports regular expressions by using the `re:` prefix |
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440 (use `literal:` to match names or namespaces that start with `re:`) |
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441 |
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442 """ |
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443 if namespace is not None: |
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444 namespace = stringutil.stringmatcher(namespace)[-1] |
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445 if name is not None: |
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446 name = stringutil.stringmatcher(name)[-1] |
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447 for entry in self: |
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448 if namespace is not None and not namespace(entry.namespace): |
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449 continue |
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450 if name is not None and not name(entry.name): |
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451 continue |
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452 yield entry |
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453 |
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454 def __iter__(self): |
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455 """Iterate over the storage |
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456 |
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457 Yields journalentry instances for each contained journal record. |
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458 |
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459 """ |
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460 local = self._open(self.vfs) |
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461 |
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462 if self.sharedvfs is None: |
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463 return local |
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464 |
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465 # iterate over both local and shared entries, but only those |
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466 # shared entries that are among the currently shared features |
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467 shared = ( |
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468 e |
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469 for e in self._open(self.sharedvfs) |
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470 if sharednamespaces.get(e.namespace) in self.sharedfeatures |
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471 ) |
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472 return _mergeentriesiter(local, shared) |
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473 |
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474 def _open(self, vfs, filename=b'namejournal', _newestfirst=True): |
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475 if not vfs.exists(filename): |
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476 return |
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477 |
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478 with vfs(filename) as f: |
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479 raw = f.read() |
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480 |
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481 lines = raw.split(b'\0') |
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482 version = lines and lines[0] |
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483 if version != b"%d" % storageversion: |
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484 version = version or _(b'not available') |
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485 raise error.Abort(_(b"unknown journal file version '%s'") % version) |
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486 |
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487 # Skip the first line, it's a version number. Normally we iterate over |
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488 # these in reverse order to list newest first; only when copying across |
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489 # a shared storage do we forgo reversing. |
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490 lines = lines[1:] |
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491 if _newestfirst: |
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492 lines = reversed(lines) |
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493 for line in lines: |
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494 if not line: |
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495 continue |
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496 yield journalentry.fromstorage(line) |
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497 |
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498 |
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499 # journal reading |
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500 # log options that don't make sense for journal |
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501 _ignoreopts = (b'no-merges', b'graph') |
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502 |
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503 |
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504 @command( |
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505 b'journal', |
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506 [ |
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507 (b'', b'all', None, b'show history for all names'), |
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508 (b'c', b'commits', None, b'show commit metadata'), |
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509 ] |
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510 + [opt for opt in cmdutil.logopts if opt[1] not in _ignoreopts], |
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511 b'[OPTION]... [BOOKMARKNAME]', |
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512 helpcategory=command.CATEGORY_CHANGE_ORGANIZATION, |
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513 ) |
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514 def journal(ui, repo, *args, **opts): |
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515 """show the previous position of bookmarks and the working copy |
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516 |
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517 The journal is used to see the previous commits that bookmarks and the |
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518 working copy pointed to. By default the previous locations for the working |
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519 copy. Passing a bookmark name will show all the previous positions of |
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520 that bookmark. Use the --all switch to show previous locations for all |
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521 bookmarks and the working copy; each line will then include the bookmark |
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522 name, or '.' for the working copy, as well. |
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523 |
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524 If `name` starts with `re:`, the remainder of the name is treated as |
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525 a regular expression. To match a name that actually starts with `re:`, |
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526 use the prefix `literal:`. |
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527 |
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528 By default hg journal only shows the commit hash and the command that was |
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529 running at that time. -v/--verbose will show the prior hash, the user, and |
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530 the time at which it happened. |
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531 |
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532 Use -c/--commits to output log information on each commit hash; at this |
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533 point you can use the usual `--patch`, `--git`, `--stat` and `--template` |
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534 switches to alter the log output for these. |
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535 |
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536 `hg journal -T json` can be used to produce machine readable output. |
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537 |
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538 """ |
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539 opts = pycompat.byteskwargs(opts) |
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540 name = b'.' |
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541 if opts.get(b'all'): |
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542 if args: |
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543 raise error.Abort( |
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544 _(b"You can't combine --all and filtering on a name") |
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545 ) |
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546 name = None |
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547 if args: |
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548 name = args[0] |
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549 |
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550 fm = ui.formatter(b'journal', opts) |
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551 |
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552 def formatnodes(nodes): |
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553 return fm.formatlist(map(fm.hexfunc, nodes), name=b'node', sep=b',') |
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554 |
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555 if opts.get(b"template") != b"json": |
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556 if name is None: |
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557 displayname = _(b'the working copy and bookmarks') |
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558 else: |
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559 displayname = b"'%s'" % name |
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560 ui.status(_(b"previous locations of %s:\n") % displayname) |
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561 |
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562 limit = logcmdutil.getlimit(opts) |
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563 entry = None |
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564 ui.pager(b'journal') |
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565 for count, entry in enumerate(repo.journal.filtered(name=name)): |
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566 if count == limit: |
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567 break |
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568 |
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569 fm.startitem() |
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570 fm.condwrite( |
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571 ui.verbose, b'oldnodes', b'%s -> ', formatnodes(entry.oldhashes) |
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572 ) |
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573 fm.write(b'newnodes', b'%s', formatnodes(entry.newhashes)) |
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574 fm.condwrite(ui.verbose, b'user', b' %-8s', entry.user) |
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575 fm.condwrite( |
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576 opts.get(b'all') or name.startswith(b're:'), |
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577 b'name', |
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578 b' %-8s', |
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579 entry.name, |
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580 ) |
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581 |
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582 fm.condwrite( |
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583 ui.verbose, |
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584 b'date', |
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585 b' %s', |
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586 fm.formatdate(entry.timestamp, b'%Y-%m-%d %H:%M %1%2'), |
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587 ) |
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588 fm.write(b'command', b' %s\n', entry.command) |
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589 |
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590 if opts.get(b"commits"): |
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591 if fm.isplain(): |
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592 displayer = logcmdutil.changesetdisplayer(ui, repo, opts) |
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593 else: |
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594 displayer = logcmdutil.changesetformatter( |
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595 ui, repo, fm.nested(b'changesets'), diffopts=opts |
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596 ) |
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597 for hash in entry.newhashes: |
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598 try: |
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599 ctx = repo[hash] |
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600 displayer.show(ctx) |
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601 except error.RepoLookupError as e: |
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602 fm.plain(b"%s\n\n" % pycompat.bytestr(e)) |
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603 displayer.close() |
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604 |
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605 fm.end() |
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606 |
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607 if entry is None: |
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608 ui.status(_(b"no recorded locations\n")) |