annotate mercurial/unionrepo.py @ 45061:02b17231f6c3

util: provide a helper function to estimate RAM size For POSIX systems, it uses sysconf. For Windows, it uses the win32 API directly. Differential Revision: https://phab.mercurial-scm.org/D8644
author Joerg Sonnenberger <joerg@bec.de>
date Tue, 09 Jun 2020 11:22:31 +0200
parents f212cc5ffceb
children a5206e71c536
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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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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 revlog.revlog.__init__(self, opener, indexfile)
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45 self.revlog2 = revlog2
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46
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47 n = len(self)
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48 self.repotiprev = n - 1
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49 self.bundlerevs = set() # used by 'bundle()' revset expression
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50 for rev2 in self.revlog2:
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51 rev = self.revlog2.index[rev2]
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52 # rev numbers - in revlog2, very different from self.rev
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53 _start, _csize, rsize, base, linkrev, p1rev, p2rev, node = rev
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54 flags = _start & 0xFFFF
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55
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56 if linkmapper is None: # link is to same revlog
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57 assert linkrev == rev2 # we never link back
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58 link = n
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59 else: # rev must be mapped from repo2 cl to unified cl by linkmapper
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60 link = linkmapper(linkrev)
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61
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62 if linkmapper is not None: # link is to same revlog
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63 base = linkmapper(base)
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64
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65 this_rev = self.index.get_rev(node)
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66 if this_rev is not None:
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67 # this happens for the common revlog revisions
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68 self.bundlerevs.add(this_rev)
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69 continue
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70
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71 p1node = self.revlog2.node(p1rev)
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72 p2node = self.revlog2.node(p2rev)
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73
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74 # TODO: it's probably wrong to set compressed length to None, but
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75 # I have no idea if csize is valid in the base revlog context.
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76 e = (
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77 flags,
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78 None,
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79 rsize,
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80 base,
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81 link,
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82 self.rev(p1node),
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83 self.rev(p2node),
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84 node,
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85 )
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86 self.index.append(e)
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87 self.bundlerevs.add(n)
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88 n += 1
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89
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90 def _chunk(self, rev):
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91 if rev <= self.repotiprev:
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92 return revlog.revlog._chunk(self, rev)
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93 return self.revlog2._chunk(self.node(rev))
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94
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95 def revdiff(self, rev1, rev2):
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96 """return or calculate a delta between two revisions"""
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97 if rev1 > self.repotiprev and rev2 > self.repotiprev:
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98 return self.revlog2.revdiff(
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99 self.revlog2.rev(self.node(rev1)),
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100 self.revlog2.rev(self.node(rev2)),
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101 )
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102 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev:
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103 return super(unionrevlog, self).revdiff(rev1, rev2)
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104
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105 return mdiff.textdiff(self.rawdata(rev1), self.rawdata(rev2))
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106
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107 def _revisiondata(self, nodeorrev, _df=None, raw=False):
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108 if isinstance(nodeorrev, int):
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109 rev = nodeorrev
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110 node = self.node(rev)
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111 else:
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112 node = nodeorrev
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113 rev = self.rev(node)
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114
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115 if rev > self.repotiprev:
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116 # work around manifestrevlog NOT being a revlog
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117 revlog2 = getattr(self.revlog2, '_revlog', self.revlog2)
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118 func = revlog2._revisiondata
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119 else:
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120 func = super(unionrevlog, self)._revisiondata
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121 return func(node, _df=_df, raw=raw)
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122
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123 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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124 raise NotImplementedError
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125
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126 def addgroup(
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127 self,
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128 deltas,
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129 linkmapper,
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130 transaction,
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131 addrevisioncb=None,
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132 maybemissingparents=False,
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133 ):
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134 raise NotImplementedError
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135
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136 def strip(self, minlink, transaction):
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137 raise NotImplementedError
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138
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139 def checksize(self):
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140 raise NotImplementedError
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141
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142
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143 class unionchangelog(unionrevlog, changelog.changelog):
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144 def __init__(self, opener, opener2):
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145 changelog.changelog.__init__(self, opener)
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146 linkmapper = None
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147 changelog2 = changelog.changelog(opener2)
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148 unionrevlog.__init__(
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149 self, opener, self.indexfile, changelog2, linkmapper
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150 )
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151
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152
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153 class unionmanifest(unionrevlog, manifest.manifestrevlog):
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154 def __init__(self, opener, opener2, linkmapper):
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155 manifest.manifestrevlog.__init__(self, opener)
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156 manifest2 = manifest.manifestrevlog(opener2)
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157 unionrevlog.__init__(
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158 self, opener, self.indexfile, manifest2, linkmapper
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159 )
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160
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161
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162 class unionfilelog(filelog.filelog):
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163 def __init__(self, opener, path, opener2, linkmapper, repo):
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164 filelog.filelog.__init__(self, opener, path)
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165 filelog2 = filelog.filelog(opener2, path)
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166 self._revlog = unionrevlog(
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167 opener, self.indexfile, filelog2._revlog, linkmapper
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168 )
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169 self._repo = repo
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170 self.repotiprev = self._revlog.repotiprev
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171 self.revlog2 = self._revlog.revlog2
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172
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173 def iscensored(self, rev):
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174 """Check if a revision is censored."""
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175 if rev <= self.repotiprev:
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176 return filelog.filelog.iscensored(self, rev)
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177 node = self.node(rev)
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178 return self.revlog2.iscensored(self.revlog2.rev(node))
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179
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180
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181 class unionpeer(localrepo.localpeer):
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182 def canpush(self):
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183 return False
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184
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185
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186 class unionrepository(object):
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187 """Represents the union of data in 2 repositories.
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188
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189 Instances are not usable if constructed directly. Use ``instance()``
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190 or ``makeunionrepository()`` to create a usable instance.
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191 """
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192
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193 def __init__(self, repo2, url):
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194 self.repo2 = repo2
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195 self._url = url
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196
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197 self.ui.setconfig(b'phases', b'publish', False, b'unionrepo')
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198
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199 @localrepo.unfilteredpropertycache
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200 def changelog(self):
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201 return unionchangelog(self.svfs, self.repo2.svfs)
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202
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203 @localrepo.unfilteredpropertycache
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204 def manifestlog(self):
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205 rootstore = unionmanifest(
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206 self.svfs, self.repo2.svfs, self.unfiltered()._clrev
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207 )
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208 return manifest.manifestlog(
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209 self.svfs, self, rootstore, self.narrowmatch()
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210 )
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211
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212 def _clrev(self, rev2):
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213 """map from repo2 changelog rev to temporary rev in self.changelog"""
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214 node = self.repo2.changelog.node(rev2)
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215 return self.changelog.rev(node)
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216
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217 def url(self):
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218 return self._url
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219
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220 def file(self, f):
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221 return unionfilelog(
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222 self.svfs, f, self.repo2.svfs, self.unfiltered()._clrev, self
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223 )
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224
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225 def close(self):
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226 self.repo2.close()
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227
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228 def cancopy(self):
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229 return False
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230
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231 def peer(self):
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232 return unionpeer(self)
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233
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234 def getcwd(self):
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235 return encoding.getcwd() # always outside the repo
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236
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237
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238 def instance(ui, path, create, intents=None, createopts=None):
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239 if create:
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240 raise error.Abort(_(b'cannot create new union repository'))
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241 parentpath = ui.config(b"bundle", b"mainreporoot")
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242 if not parentpath:
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243 # try to find the correct path to the working directory repo
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244 parentpath = cmdutil.findrepo(encoding.getcwd())
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245 if parentpath is None:
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246 parentpath = b''
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247 if parentpath:
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248 # Try to make the full path relative so we get a nice, short URL.
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249 # In particular, we don't want temp dir names in test outputs.
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250 cwd = encoding.getcwd()
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251 if parentpath == cwd:
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252 parentpath = b''
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253 else:
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254 cwd = pathutil.normasprefix(cwd)
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255 if parentpath.startswith(cwd):
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256 parentpath = parentpath[len(cwd) :]
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257 if path.startswith(b'union:'):
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258 s = path.split(b":", 1)[1].split(b"+", 1)
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259 if len(s) == 1:
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260 repopath, repopath2 = parentpath, s[0]
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261 else:
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262 repopath, repopath2 = s
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263 else:
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264 repopath, repopath2 = parentpath, path
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265
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266 return makeunionrepository(ui, repopath, repopath2)
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267
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268
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269 def makeunionrepository(ui, repopath1, repopath2):
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270 """Make a union repository object from 2 local repo paths."""
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271 repo1 = localrepo.instance(ui, repopath1, create=False)
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272 repo2 = localrepo.instance(ui, repopath2, create=False)
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273
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274 url = b'union:%s+%s' % (
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275 util.expandpath(repopath1),
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276 util.expandpath(repopath2),
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277 )
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278
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279 class derivedunionrepository(unionrepository, repo1.__class__):
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280 pass
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281
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282 repo = repo1
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283 repo.__class__ = derivedunionrepository
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284 unionrepository.__init__(repo1, repo2, url)
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285
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286 return repo