annotate mercurial/unionrepo.py @ 47249:130c9f7ed914

revlog: add a "data compression mode" entry in the index tuple That will make it possible to keep track of compression information in the revlog index, opening the way to more efficient revision restoration (in native code, but the python usage is already defeating performance work). We start with adding a new entry to the index tuple, using a value matching the current behavior. We will introduce storage and other value in later changesets. Differential Revision: https://phab.mercurial-scm.org/D10646
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 03 May 2021 18:19:16 +0200
parents 8d3c2f9d4af7
children 2b69555e4875
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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 ) = rev
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74 flags = _start & 0xFFFF
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75
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76 if linkmapper is None: # link is to same revlog
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77 assert linkrev == rev2 # we never link back
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78 link = n
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79 else: # rev must be mapped from repo2 cl to unified cl by linkmapper
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80 link = linkmapper(linkrev)
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81
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82 if linkmapper is not None: # link is to same revlog
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83 base = linkmapper(base)
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84
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85 this_rev = self.index.get_rev(node)
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86 if this_rev is not None:
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87 # this happens for the common revlog revisions
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88 self.bundlerevs.add(this_rev)
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89 continue
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90
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91 p1node = self.revlog2.node(p1rev)
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92 p2node = self.revlog2.node(p2rev)
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93
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94 # TODO: it's probably wrong to set compressed length to -1, but
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95 # I have no idea if csize is valid in the base revlog context.
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96 e = (
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97 flags,
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98 -1,
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99 rsize,
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100 base,
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101 link,
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102 self.rev(p1node),
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103 self.rev(p2node),
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104 node,
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105 0, # sidedata offset
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106 0, # sidedata size
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107 revlog_constants.COMP_MODE_INLINE,
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108 )
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109 self.index.append(e)
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110 self.bundlerevs.add(n)
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111 n += 1
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112
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113 def _chunk(self, rev):
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114 if rev <= self.repotiprev:
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115 return revlog.revlog._chunk(self, rev)
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116 return self.revlog2._chunk(self.node(rev))
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117
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118 def revdiff(self, rev1, rev2):
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119 """return or calculate a delta between two revisions"""
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120 if rev1 > self.repotiprev and rev2 > self.repotiprev:
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121 return self.revlog2.revdiff(
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122 self.revlog2.rev(self.node(rev1)),
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123 self.revlog2.rev(self.node(rev2)),
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124 )
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125 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev:
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126 return super(unionrevlog, self).revdiff(rev1, rev2)
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127
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents: 42825
diff changeset
128 return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2))
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129
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130 def _revisiondata(self, nodeorrev, _df=None, raw=False):
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131 if isinstance(nodeorrev, int):
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132 rev = nodeorrev
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133 node = self.node(rev)
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134 else:
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135 node = nodeorrev
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diff changeset
136 rev = self.rev(node)
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137
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138 if rev > self.repotiprev:
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diff changeset
139 # work around manifestrevlog NOT being a revlog
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140 revlog2 = getattr(self.revlog2, '_revlog', self.revlog2)
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diff changeset
141 func = revlog2._revisiondata
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142 else:
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diff changeset
143 func = super(unionrevlog, self)._revisiondata
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144 return func(node, _df=_df, raw=raw)
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145
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146 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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147 raise NotImplementedError
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148
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149 def addgroup(
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150 self,
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151 deltas,
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152 linkmapper,
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153 transaction,
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parents: 45815
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154 alwayscache=False,
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155 addrevisioncb=None,
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156 duplicaterevisioncb=None,
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157 maybemissingparents=False,
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158 ):
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159 raise NotImplementedError
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160
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parents: 41038
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161 def strip(self, minlink, transaction):
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162 raise NotImplementedError
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163
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164 def checksize(self):
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165 raise NotImplementedError
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166
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167
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168 class unionchangelog(unionrevlog, changelog.changelog):
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169 def __init__(self, opener, opener2):
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170 changelog.changelog.__init__(self, opener)
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171 linkmapper = None
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172 changelog2 = changelog.changelog(opener2)
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parents: 47148
diff changeset
173 unionrevlog.__init__(self, opener, self.radix, changelog2, linkmapper)
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174
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175
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Durham Goode <durham@fb.com>
parents: 30218
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176 class unionmanifest(unionrevlog, manifest.manifestrevlog):
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parents: 46373
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177 def __init__(self, nodeconstants, opener, opener2, linkmapper):
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178 manifest.manifestrevlog.__init__(self, nodeconstants, opener)
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179 manifest2 = manifest.manifestrevlog(nodeconstants, opener2)
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180 unionrevlog.__init__(
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diff changeset
181 self, opener, self._revlog.radix, manifest2, linkmapper
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182 )
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183
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184
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 34219
diff changeset
185 class unionfilelog(filelog.filelog):
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186 def __init__(self, opener, path, opener2, linkmapper, repo):
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187 filelog.filelog.__init__(self, opener, path)
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188 filelog2 = filelog.filelog(opener2, path)
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189 self._revlog = unionrevlog(
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diff changeset
190 opener, self._revlog.radix, filelog2._revlog, linkmapper
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191 )
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192 self._repo = repo
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193 self.repotiprev = self._revlog.repotiprev
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194 self.revlog2 = self._revlog.revlog2
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195
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parents: 24003
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196 def iscensored(self, rev):
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parents: 24003
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197 """Check if a revision is censored."""
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parents: 24003
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198 if rev <= self.repotiprev:
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parents: 24003
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199 return filelog.filelog.iscensored(self, rev)
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Sean Farley <sean@farley.io>
parents: 26587
diff changeset
200 node = self.node(rev)
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parents: 26587
diff changeset
201 return self.revlog2.iscensored(self.revlog2.rev(node))
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parents: 24003
diff changeset
202
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203
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204 class unionpeer(localrepo.localpeer):
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205 def canpush(self):
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206 return False
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207
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208
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diff changeset
209 class unionrepository(object):
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210 """Represents the union of data in 2 repositories.
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211
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212 Instances are not usable if constructed directly. Use ``instance()``
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213 or ``makeunionrepository()`` to create a usable instance.
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214 """
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215
39605
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216 def __init__(self, repo2, url):
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217 self.repo2 = repo2
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218 self._url = url
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219
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diff changeset
220 self.ui.setconfig(b'phases', b'publish', False, b'unionrepo')
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221
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diff changeset
222 @localrepo.unfilteredpropertycache
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diff changeset
223 def changelog(self):
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Angel Ezquerra <angel.ezquerra@gmail.com>
parents: 20790
diff changeset
224 return unionchangelog(self.svfs, self.repo2.svfs)
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225
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 39605
diff changeset
226 @localrepo.unfilteredpropertycache
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diff changeset
227 def manifestlog(self):
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228 rootstore = unionmanifest(
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diff changeset
229 self.nodeconstants,
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diff changeset
230 self.svfs,
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diff changeset
231 self.repo2.svfs,
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diff changeset
232 self.unfiltered()._clrev,
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233 )
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diff changeset
234 return manifest.manifestlog(
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diff changeset
235 self.svfs, self, rootstore, self.narrowmatch()
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diff changeset
236 )
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diff changeset
237
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diff changeset
238 def _clrev(self, rev2):
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parents:
diff changeset
239 """map from repo2 changelog rev to temporary rev in self.changelog"""
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parents:
diff changeset
240 node = self.repo2.changelog.node(rev2)
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parents:
diff changeset
241 return self.changelog.rev(node)
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diff changeset
242
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parents:
diff changeset
243 def url(self):
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parents:
diff changeset
244 return self._url
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245
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diff changeset
246 def file(self, f):
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247 return unionfilelog(
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diff changeset
248 self.svfs, f, self.repo2.svfs, self.unfiltered()._clrev, self
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diff changeset
249 )
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250
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diff changeset
251 def close(self):
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diff changeset
252 self.repo2.close()
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253
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diff changeset
254 def cancopy(self):
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diff changeset
255 return False
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256
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257 def peer(self):
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diff changeset
258 return unionpeer(self)
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259
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diff changeset
260 def getcwd(self):
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diff changeset
261 return encoding.getcwd() # always outside the repo
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262
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263
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264 def instance(ui, path, create, intents=None, createopts=None):
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265 if create:
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266 raise error.Abort(_(b'cannot create new union repository'))
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267 parentpath = ui.config(b"bundle", b"mainreporoot")
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268 if not parentpath:
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269 # try to find the correct path to the working directory repo
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270 parentpath = cmdutil.findrepo(encoding.getcwd())
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271 if parentpath is None:
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272 parentpath = b''
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273 if parentpath:
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274 # Try to make the full path relative so we get a nice, short URL.
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275 # In particular, we don't want temp dir names in test outputs.
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276 cwd = encoding.getcwd()
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277 if parentpath == cwd:
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278 parentpath = b''
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279 else:
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280 cwd = pathutil.normasprefix(cwd)
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281 if parentpath.startswith(cwd):
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282 parentpath = parentpath[len(cwd) :]
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283 if path.startswith(b'union:'):
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284 s = path.split(b":", 1)[1].split(b"+", 1)
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285 if len(s) == 1:
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286 repopath, repopath2 = parentpath, s[0]
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287 else:
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288 repopath, repopath2 = s
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289 else:
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290 repopath, repopath2 = parentpath, path
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291
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292 return makeunionrepository(ui, repopath, repopath2)
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293
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294
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295 def makeunionrepository(ui, repopath1, repopath2):
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296 """Make a union repository object from 2 local repo paths."""
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297 repo1 = localrepo.instance(ui, repopath1, create=False)
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298 repo2 = localrepo.instance(ui, repopath2, create=False)
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299
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300 url = b'union:%s+%s' % (
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301 util.expandpath(repopath1),
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302 util.expandpath(repopath2),
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303 )
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304
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305 class derivedunionrepository(unionrepository, repo1.__class__):
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306 pass
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307
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308 repo = repo1
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309 repo.__class__ = derivedunionrepository
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310 unionrepository.__init__(repo1, repo2, url)
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311
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312 return repo