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annotate mercurial/unionrepo.py @ 47682:78f7f0d490ee

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dirstate-v2: Move fixed-size tree metadata into the docket file Before this changeset, the dirstate-v2 data file contained not only nodes and paths that may be reused when appending to an existing file, but also some fixed-size metadata that applies to the entire tree and was added at the end of the data file for every append. This moves that metadata into the docket file, so that repeated "append" operations without meaningful changes don?t actually need to grow any file. Differential Revision: https://phab.mercurial-scm.org/D11098
author Simon Sapin <simon.sapin@octobus.net>
date Thu, 15 Jul 2021 23:02:17 +0200
parents 2b69555e4875
children 52034c42c09d
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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 from .revlogutils import (
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35 constants as revlog_constants,
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36 )
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37
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38
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39 class unionrevlog(revlog.revlog):
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40 def __init__(self, opener, radix, revlog2, linkmapper):
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41 # How it works:
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42 # To retrieve a revision, we just need to know the node id so we can
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43 # look it up in revlog2.
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44 #
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45 # To differentiate a rev in the second revlog from a rev in the revlog,
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46 # we check revision against repotiprev.
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47 opener = vfsmod.readonlyvfs(opener)
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48 target = getattr(revlog2, 'target', None)
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49 if target is None:
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50 # a revlog wrapper, eg: the manifestlog that is not an actual revlog
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51 target = revlog2._revlog.target
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52 revlog.revlog.__init__(self, opener, target=target, radix=radix)
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53 self.revlog2 = revlog2
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54
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55 n = len(self)
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56 self.repotiprev = n - 1
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57 self.bundlerevs = set() # used by 'bundle()' revset expression
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58 for rev2 in self.revlog2:
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59 rev = self.revlog2.index[rev2]
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60 # rev numbers - in revlog2, very different from self.rev
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61 (
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62 _start,
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63 _csize,
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64 rsize,
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65 base,
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66 linkrev,
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67 p1rev,
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68 p2rev,
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69 node,
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70 _sdo,
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71 _sds,
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72 _dcm,
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73 _sdcm,
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74 ) = rev
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75 flags = _start & 0xFFFF
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76
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77 if linkmapper is None: # link is to same revlog
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78 assert linkrev == rev2 # we never link back
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79 link = n
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80 else: # rev must be mapped from repo2 cl to unified cl by linkmapper
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81 link = linkmapper(linkrev)
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82
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83 if linkmapper is not None: # link is to same revlog
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84 base = linkmapper(base)
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85
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86 this_rev = self.index.get_rev(node)
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87 if this_rev is not None:
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88 # this happens for the common revlog revisions
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89 self.bundlerevs.add(this_rev)
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90 continue
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91
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92 p1node = self.revlog2.node(p1rev)
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93 p2node = self.revlog2.node(p2rev)
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94
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95 # TODO: it's probably wrong to set compressed length to -1, but
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96 # I have no idea if csize is valid in the base revlog context.
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97 e = (
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98 flags,
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99 -1,
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100 rsize,
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101 base,
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102 link,
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103 self.rev(p1node),
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104 self.rev(p2node),
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105 node,
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106 0, # sidedata offset
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107 0, # sidedata size
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108 revlog_constants.COMP_MODE_INLINE,
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109 revlog_constants.COMP_MODE_INLINE,
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110 )
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111 self.index.append(e)
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112 self.bundlerevs.add(n)
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113 n += 1
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114
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115 def _chunk(self, rev):
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116 if rev <= self.repotiprev:
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117 return revlog.revlog._chunk(self, rev)
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118 return self.revlog2._chunk(self.node(rev))
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119
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120 def revdiff(self, rev1, rev2):
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121 """return or calculate a delta between two revisions"""
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122 if rev1 > self.repotiprev and rev2 > self.repotiprev:
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123 return self.revlog2.revdiff(
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124 self.revlog2.rev(self.node(rev1)),
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125 self.revlog2.rev(self.node(rev2)),
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126 )
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127 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev:
42837
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parents: 42836
diff changeset
128 return super(unionrevlog, self).revdiff(rev1, rev2)
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129
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diff changeset
130 return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2))
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131
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132 def _revisiondata(self, nodeorrev, _df=None, raw=False):
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133 if isinstance(nodeorrev, int):
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134 rev = nodeorrev
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135 node = self.node(rev)
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136 else:
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137 node = nodeorrev
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diff changeset
138 rev = self.rev(node)
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139
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140 if rev > self.repotiprev:
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141 # work around manifestrevlog NOT being a revlog
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142 revlog2 = getattr(self.revlog2, '_revlog', self.revlog2)
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143 func = revlog2._revisiondata
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144 else:
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145 func = super(unionrevlog, self)._revisiondata
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146 return func(node, _df=_df, raw=raw)
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147
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148 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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149 raise NotImplementedError
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150
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151 def addgroup(
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152 self,
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153 deltas,
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154 linkmapper,
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155 transaction,
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156 alwayscache=False,
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157 addrevisioncb=None,
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158 duplicaterevisioncb=None,
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159 maybemissingparents=False,
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160 ):
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161 raise NotImplementedError
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162
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parents: 41041
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163 def strip(self, minlink, transaction):
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164 raise NotImplementedError
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165
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166 def checksize(self):
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167 raise NotImplementedError
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168
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169
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170 class unionchangelog(unionrevlog, changelog.changelog):
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171 def __init__(self, opener, opener2):
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172 changelog.changelog.__init__(self, opener)
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173 linkmapper = None
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174 changelog2 = changelog.changelog(opener2)
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175 unionrevlog.__init__(self, opener, self.radix, changelog2, linkmapper)
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176
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177
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parents: 30218
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178 class unionmanifest(unionrevlog, manifest.manifestrevlog):
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179 def __init__(self, nodeconstants, opener, opener2, linkmapper):
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180 manifest.manifestrevlog.__init__(self, nodeconstants, opener)
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181 manifest2 = manifest.manifestrevlog(nodeconstants, opener2)
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182 unionrevlog.__init__(
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183 self, opener, self._revlog.radix, manifest2, linkmapper
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184 )
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185
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186
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187 class unionfilelog(filelog.filelog):
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188 def __init__(self, opener, path, opener2, linkmapper, repo):
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189 filelog.filelog.__init__(self, opener, path)
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190 filelog2 = filelog.filelog(opener2, path)
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191 self._revlog = unionrevlog(
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diff changeset
192 opener, self._revlog.radix, filelog2._revlog, linkmapper
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193 )
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194 self._repo = repo
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195 self.repotiprev = self._revlog.repotiprev
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196 self.revlog2 = self._revlog.revlog2
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197
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198 def iscensored(self, rev):
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199 """Check if a revision is censored."""
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parents: 24003
diff changeset
200 if rev <= self.repotiprev:
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diff changeset
201 return filelog.filelog.iscensored(self, rev)
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parents: 26587
diff changeset
202 node = self.node(rev)
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parents: 26587
diff changeset
203 return self.revlog2.iscensored(self.revlog2.rev(node))
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parents: 24003
diff changeset
204
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205
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206 class unionpeer(localrepo.localpeer):
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207 def canpush(self):
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208 return False
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209
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210
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diff changeset
211 class unionrepository(object):
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212 """Represents the union of data in 2 repositories.
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213
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214 Instances are not usable if constructed directly. Use ``instance()``
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215 or ``makeunionrepository()`` to create a usable instance.
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216 """
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217
39621
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218 def __init__(self, repo2, url):
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219 self.repo2 = repo2
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220 self._url = url
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221
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diff changeset
222 self.ui.setconfig(b'phases', b'publish', False, b'unionrepo')
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223
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diff changeset
224 @localrepo.unfilteredpropertycache
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diff changeset
225 def changelog(self):
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Angel Ezquerra <angel.ezquerra@gmail.com>
parents: 20790
diff changeset
226 return unionchangelog(self.svfs, self.repo2.svfs)
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227
39779
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diff changeset
228 @localrepo.unfilteredpropertycache
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diff changeset
229 def manifestlog(self):
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230 rootstore = unionmanifest(
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diff changeset
231 self.nodeconstants,
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diff changeset
232 self.svfs,
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233 self.repo2.svfs,
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diff changeset
234 self.unfiltered()._clrev,
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235 )
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diff changeset
236 return manifest.manifestlog(
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diff changeset
237 self.svfs, self, rootstore, self.narrowmatch()
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diff changeset
238 )
39779
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diff changeset
239
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diff changeset
240 def _clrev(self, rev2):
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parents:
diff changeset
241 """map from repo2 changelog rev to temporary rev in self.changelog"""
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parents:
diff changeset
242 node = self.repo2.changelog.node(rev2)
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parents:
diff changeset
243 return self.changelog.rev(node)
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diff changeset
244
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parents:
diff changeset
245 def url(self):
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parents:
diff changeset
246 return self._url
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247
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diff changeset
248 def file(self, f):
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diff changeset
249 return unionfilelog(
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diff changeset
250 self.svfs, f, self.repo2.svfs, self.unfiltered()._clrev, self
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diff changeset
251 )
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252
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253 def close(self):
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diff changeset
254 self.repo2.close()
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255
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diff changeset
256 def cancopy(self):
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diff changeset
257 return False
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258
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259 def peer(self):
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diff changeset
260 return unionpeer(self)
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261
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262 def getcwd(self):
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263 return encoding.getcwd() # always outside the repo
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264
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265
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266 def instance(ui, path, create, intents=None, createopts=None):
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267 if create:
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268 raise error.Abort(_(b'cannot create new union repository'))
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269 parentpath = ui.config(b"bundle", b"mainreporoot")
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270 if not parentpath:
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271 # try to find the correct path to the working directory repo
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272 parentpath = cmdutil.findrepo(encoding.getcwd())
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273 if parentpath is None:
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274 parentpath = b''
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275 if parentpath:
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276 # Try to make the full path relative so we get a nice, short URL.
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277 # In particular, we don't want temp dir names in test outputs.
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278 cwd = encoding.getcwd()
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279 if parentpath == cwd:
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280 parentpath = b''
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281 else:
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282 cwd = pathutil.normasprefix(cwd)
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283 if parentpath.startswith(cwd):
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284 parentpath = parentpath[len(cwd) :]
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285 if path.startswith(b'union:'):
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286 s = path.split(b":", 1)[1].split(b"+", 1)
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287 if len(s) == 1:
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288 repopath, repopath2 = parentpath, s[0]
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289 else:
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290 repopath, repopath2 = s
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291 else:
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292 repopath, repopath2 = parentpath, path
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293
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294 return makeunionrepository(ui, repopath, repopath2)
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295
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296
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297 def makeunionrepository(ui, repopath1, repopath2):
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298 """Make a union repository object from 2 local repo paths."""
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299 repo1 = localrepo.instance(ui, repopath1, create=False)
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300 repo2 = localrepo.instance(ui, repopath2, create=False)
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301
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302 url = b'union:%s+%s' % (
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303 util.expandpath(repopath1),
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304 util.expandpath(repopath2),
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305 )
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306
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307 class derivedunionrepository(unionrepository, repo1.__class__):
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308 pass
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309
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310 repo = repo1
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311 repo.__class__ = derivedunionrepository
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312 unionrepository.__init__(repo1, repo2, url)
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313
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314 return repo