annotate mercurial/unionrepo.py @ 47089:4c041c71ec01

revlog: introduce an explicit tracking of what the revlog is about Since the dawn of time, people have been forced to rely to lossy introspection of the index filename to determine what the purpose and role of the revlog they encounter is. This is hacky, error prone, inflexible, abstraction-leaky, <insert-your-own-complaints-here>. In f63299ee7e4d Rapha?l introduced a new attribute to track this information: `revlog_kind`. However it is initialized in an odd place and various instances end up not having it set. In addition is only tracking some of the information we end up having to introspect in various pieces of code. So we add a new attribute that holds more data and is more strictly enforced. This work is done in collaboration with Rapha?l. The `revlog_kind` one will be removed/adapted in the next changeset. We expect to be able to clean up various existing piece of code and to simplify coming work around the newer revlog format. Differential Revision: https://phab.mercurial-scm.org/D10352
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 06 Apr 2021 05:20:24 +0200
parents 6266d19556ad
children 4292bed8da7c
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1 # unionrepo.py - repository class for viewing union of repository changesets
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2 #
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3 # Derived from bundlerepo.py
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4 # Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.com>
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5 # Copyright 2013 Unity Technologies, Mads Kiilerich <madski@unity3d.com>
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6 #
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7 # This software may be used and distributed according to the terms of the
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8 # GNU General Public License version 2 or any later version.
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9
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10 """Repository class for "in-memory pull" of one local repository to another,
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11 allowing operations like diff and log with revsets.
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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 from .i18n import _
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17 from .pycompat import getattr
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18
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19 from . import (
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20 changelog,
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21 cmdutil,
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22 encoding,
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23 error,
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24 filelog,
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25 localrepo,
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26 manifest,
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27 mdiff,
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28 pathutil,
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29 revlog,
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30 util,
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31 vfs as vfsmod,
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32 )
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33
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34
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35 class unionrevlog(revlog.revlog):
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36 def __init__(self, opener, indexfile, revlog2, linkmapper):
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37 # How it works:
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38 # To retrieve a revision, we just need to know the node id so we can
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39 # look it up in revlog2.
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40 #
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41 # To differentiate a rev in the second revlog from a rev in the revlog,
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42 # we check revision against repotiprev.
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43 opener = vfsmod.readonlyvfs(opener)
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44 target = getattr(revlog2, 'target', None)
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45 if target is None:
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46 # a revlog wrapper, eg: the manifestlog that is not an actual revlog
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47 target = revlog2._revlog.target
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48 revlog.revlog.__init__(self, opener, target=target, indexfile=indexfile)
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49 self.revlog2 = revlog2
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50
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51 n = len(self)
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52 self.repotiprev = n - 1
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53 self.bundlerevs = set() # used by 'bundle()' revset expression
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54 for rev2 in self.revlog2:
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55 rev = self.revlog2.index[rev2]
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56 # rev numbers - in revlog2, very different from self.rev
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57 _start, _csize, rsize, base, linkrev, p1rev, p2rev, node = rev
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58 flags = _start & 0xFFFF
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59
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60 if linkmapper is None: # link is to same revlog
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61 assert linkrev == rev2 # we never link back
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62 link = n
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63 else: # rev must be mapped from repo2 cl to unified cl by linkmapper
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64 link = linkmapper(linkrev)
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65
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66 if linkmapper is not None: # link is to same revlog
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67 base = linkmapper(base)
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68
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69 this_rev = self.index.get_rev(node)
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70 if this_rev is not None:
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71 # this happens for the common revlog revisions
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72 self.bundlerevs.add(this_rev)
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73 continue
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74
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75 p1node = self.revlog2.node(p1rev)
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76 p2node = self.revlog2.node(p2rev)
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77
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78 # TODO: it's probably wrong to set compressed length to -1, but
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79 # I have no idea if csize is valid in the base revlog context.
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80 e = (
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81 flags,
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82 -1,
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83 rsize,
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84 base,
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85 link,
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86 self.rev(p1node),
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87 self.rev(p2node),
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88 node,
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89 )
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90 self.index.append(e)
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91 self.bundlerevs.add(n)
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92 n += 1
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93
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94 def _chunk(self, rev):
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95 if rev <= self.repotiprev:
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96 return revlog.revlog._chunk(self, rev)
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97 return self.revlog2._chunk(self.node(rev))
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98
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99 def revdiff(self, rev1, rev2):
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100 """return or calculate a delta between two revisions"""
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101 if rev1 > self.repotiprev and rev2 > self.repotiprev:
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102 return self.revlog2.revdiff(
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103 self.revlog2.rev(self.node(rev1)),
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104 self.revlog2.rev(self.node(rev2)),
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105 )
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106 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev:
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107 return super(unionrevlog, self).revdiff(rev1, rev2)
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108
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109 return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2))
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110
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111 def _revisiondata(self, nodeorrev, _df=None, raw=False):
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112 if isinstance(nodeorrev, int):
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113 rev = nodeorrev
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114 node = self.node(rev)
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115 else:
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116 node = nodeorrev
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117 rev = self.rev(node)
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118
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119 if rev > self.repotiprev:
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120 # work around manifestrevlog NOT being a revlog
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121 revlog2 = getattr(self.revlog2, '_revlog', self.revlog2)
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122 func = revlog2._revisiondata
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123 else:
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124 func = super(unionrevlog, self)._revisiondata
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125 return func(node, _df=_df, raw=raw)
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126
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127 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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128 raise NotImplementedError
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129
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130 def addgroup(
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131 self,
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132 deltas,
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133 linkmapper,
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134 transaction,
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135 alwayscache=False,
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136 addrevisioncb=None,
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137 duplicaterevisioncb=None,
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138 maybemissingparents=False,
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139 ):
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140 raise NotImplementedError
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141
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142 def strip(self, minlink, transaction):
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143 raise NotImplementedError
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144
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145 def checksize(self):
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146 raise NotImplementedError
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147
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148
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149 class unionchangelog(unionrevlog, changelog.changelog):
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150 def __init__(self, opener, opener2):
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151 changelog.changelog.__init__(self, opener)
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152 linkmapper = None
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153 changelog2 = changelog.changelog(opener2)
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154 unionrevlog.__init__(
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155 self, opener, self.indexfile, changelog2, linkmapper
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156 )
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157
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158
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159 class unionmanifest(unionrevlog, manifest.manifestrevlog):
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160 def __init__(self, nodeconstants, opener, opener2, linkmapper):
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161 manifest.manifestrevlog.__init__(self, nodeconstants, opener)
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162 manifest2 = manifest.manifestrevlog(nodeconstants, opener2)
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163 unionrevlog.__init__(
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164 self, opener, self.indexfile, manifest2, linkmapper
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165 )
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166
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167
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168 class unionfilelog(filelog.filelog):
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169 def __init__(self, opener, path, opener2, linkmapper, repo):
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170 filelog.filelog.__init__(self, opener, path)
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171 filelog2 = filelog.filelog(opener2, path)
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172 self._revlog = unionrevlog(
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173 opener, self.indexfile, filelog2._revlog, linkmapper
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174 )
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175 self._repo = repo
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176 self.repotiprev = self._revlog.repotiprev
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177 self.revlog2 = self._revlog.revlog2
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178
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179 def iscensored(self, rev):
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180 """Check if a revision is censored."""
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181 if rev <= self.repotiprev:
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182 return filelog.filelog.iscensored(self, rev)
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183 node = self.node(rev)
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184 return self.revlog2.iscensored(self.revlog2.rev(node))
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185
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186
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187 class unionpeer(localrepo.localpeer):
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188 def canpush(self):
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189 return False
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190
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191
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192 class unionrepository(object):
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193 """Represents the union of data in 2 repositories.
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194
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195 Instances are not usable if constructed directly. Use ``instance()``
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196 or ``makeunionrepository()`` to create a usable instance.
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197 """
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198
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199 def __init__(self, repo2, url):
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200 self.repo2 = repo2
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201 self._url = url
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202
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203 self.ui.setconfig(b'phases', b'publish', False, b'unionrepo')
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204
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205 @localrepo.unfilteredpropertycache
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206 def changelog(self):
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207 return unionchangelog(self.svfs, self.repo2.svfs)
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208
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209 @localrepo.unfilteredpropertycache
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210 def manifestlog(self):
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211 rootstore = unionmanifest(
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212 self.nodeconstants,
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213 self.svfs,
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214 self.repo2.svfs,
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215 self.unfiltered()._clrev,
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216 )
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217 return manifest.manifestlog(
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218 self.svfs, self, rootstore, self.narrowmatch()
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219 )
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220
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221 def _clrev(self, rev2):
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222 """map from repo2 changelog rev to temporary rev in self.changelog"""
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223 node = self.repo2.changelog.node(rev2)
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224 return self.changelog.rev(node)
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225
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226 def url(self):
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227 return self._url
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228
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229 def file(self, f):
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230 return unionfilelog(
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231 self.svfs, f, self.repo2.svfs, self.unfiltered()._clrev, self
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232 )
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233
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234 def close(self):
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diff changeset
235 self.repo2.close()
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236
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237 def cancopy(self):
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238 return False
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239
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240 def peer(self):
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241 return unionpeer(self)
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242
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243 def getcwd(self):
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244 return encoding.getcwd() # always outside the repo
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245
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246
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247 def instance(ui, path, create, intents=None, createopts=None):
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248 if create:
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249 raise error.Abort(_(b'cannot create new union repository'))
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250 parentpath = ui.config(b"bundle", b"mainreporoot")
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251 if not parentpath:
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252 # try to find the correct path to the working directory repo
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253 parentpath = cmdutil.findrepo(encoding.getcwd())
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254 if parentpath is None:
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255 parentpath = b''
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256 if parentpath:
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257 # Try to make the full path relative so we get a nice, short URL.
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258 # In particular, we don't want temp dir names in test outputs.
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diff changeset
259 cwd = encoding.getcwd()
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260 if parentpath == cwd:
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261 parentpath = b''
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diff changeset
262 else:
24835
e4f75c93f073 unionrepo: use pathutil.normasprefix to ensure os.sep at the end of cwd
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 24118
diff changeset
263 cwd = pathutil.normasprefix(cwd)
18944
a9c443b3b240 unionrepo: read-only operations on a union of two localrepos
Mads Kiilerich <madski@unity3d.com>
parents:
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264 if parentpath.startswith(cwd):
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Augie Fackler <augie@google.com>
parents: 42839
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265 parentpath = parentpath[len(cwd) :]
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Augie Fackler <augie@google.com>
parents: 43076
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266 if path.startswith(b'union:'):
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Augie Fackler <augie@google.com>
parents: 43076
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267 s = path.split(b":", 1)[1].split(b"+", 1)
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Mads Kiilerich <madski@unity3d.com>
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268 if len(s) == 1:
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Mads Kiilerich <madski@unity3d.com>
parents:
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269 repopath, repopath2 = parentpath, s[0]
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Mads Kiilerich <madski@unity3d.com>
parents:
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270 else:
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Mads Kiilerich <madski@unity3d.com>
parents:
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271 repopath, repopath2 = s
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Mads Kiilerich <madski@unity3d.com>
parents:
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272 else:
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Mads Kiilerich <madski@unity3d.com>
parents:
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273 repopath, repopath2 = parentpath, path
39621
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
274
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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275 return makeunionrepository(ui, repopath, repopath2)
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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276
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Augie Fackler <augie@google.com>
parents: 42839
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277
39621
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
278 def makeunionrepository(ui, repopath1, repopath2):
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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279 """Make a union repository object from 2 local repo paths."""
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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280 repo1 = localrepo.instance(ui, repopath1, create=False)
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
281 repo2 = localrepo.instance(ui, repopath2, create=False)
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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282
43077
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Augie Fackler <augie@google.com>
parents: 43076
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283 url = b'union:%s+%s' % (
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Augie Fackler <augie@google.com>
parents: 42839
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284 util.expandpath(repopath1),
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Augie Fackler <augie@google.com>
parents: 42839
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285 util.expandpath(repopath2),
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Augie Fackler <augie@google.com>
parents: 42839
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286 )
39621
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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287
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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288 class derivedunionrepository(unionrepository, repo1.__class__):
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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289 pass
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
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290
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
291 repo = repo1
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
292 repo.__class__ = derivedunionrepository
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
293 unionrepository.__init__(repo1, repo2, url)
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
294
23f2299e9e53 unionrepo: dynamically create repository type from base repository
Gregory Szorc <gregory.szorc@gmail.com>
parents: 39565
diff changeset
295 return repo