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annotate rhodecode/lib/unionrepo.py @ 3371:199fd214b213 beta

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author Marcin Kuzminski <marcin@python-works.com>
date Fri, 15 Feb 2013 00:53:47 +0100
parents ead7a902998c
children 6354556781ef
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1 # unionrepo.py - repository class for viewing union of repositories
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2 #
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3 # Derived from Mercurial 2.5 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 """
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12
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13 from mercurial.node import nullid
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14 from mercurial import util, mdiff
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15 from mercurial import localrepo, changelog, manifest, filelog, revlog
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16
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17 class unionrevlog(revlog.revlog):
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18 def __init__(self, opener, indexfile, revlog2, linkmapper):
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19 # How it works:
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20 # To retrieve a revision, we just need to know the node id so we can
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21 # look it up in revlog2.
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22 #
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23 # basemap is indexed with revisions coming from the second revlog.
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24 #
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25 # To differentiate a rev in the second revlog from a rev in the revlog,
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26 # we check revision against basemap.
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27 revlog.revlog.__init__(self, opener, indexfile)
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28 self.revlog2 = revlog2
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29
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30 self.basemap = {} # mapping rev that is in revlog2 to ... nothing
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31 n = len(self)
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32 self.bundlerevs = set() # used by 'bundle()' revset expression
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33 for rev2 in self.revlog2:
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34 rev = self.revlog2.index[rev2]
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35 # rev numbers - in revlog2, very different from self.rev
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36 _start, _csize, _rsize, _base, linkrev, p1rev, p2rev, node = rev
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37
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38 if linkmapper is None: # link is to same revlog
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39 assert linkrev == rev2 # we never link back
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40 link = n
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41 else: # rev must be mapped from repo2 cl to unified cl by linkmapper
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42 link = linkmapper(linkrev)
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43
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44 if node in self.nodemap:
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45 # this happens for for the common revlog revisions
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46 self.bundlerevs.add(self.nodemap[node])
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47 continue
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48
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49 p1node = self.revlog2.node(p1rev)
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50 p2node = self.revlog2.node(p2rev)
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51
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52 e = (None, None, None, None,
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53 link, self.rev(p1node), self.rev(p2node), node)
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54 self.basemap[n] = None
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55 self.index.insert(-1, e)
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56 self.nodemap[node] = n
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57 self.bundlerevs.add(n)
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58 n += 1
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59
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60 def _chunk(self, rev):
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61 if rev not in self.basemap:
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62 return revlog.revlog._chunk(self, rev)
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63 return self.revlog2._chunk(self.node(rev))
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64
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65 def revdiff(self, rev1, rev2):
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66 """return or calculate a delta between two revisions"""
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67 if rev1 in self.basemap and rev2 in self.basemap:
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68 return self.revlog2.revdiff(
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69 self.revlog2.rev(self.node(rev1)),
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70 self.revlog2.rev(self.node(rev2)))
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71 elif rev1 not in self.basemap and rev2 not in self.basemap:
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72 return revlog.revlog.revdiff(self, rev1, rev2)
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73
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74 return mdiff.textdiff(self.revision(self.node(rev1)),
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75 self.revision(self.node(rev2)))
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76
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77 def revision(self, nodeorrev):
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78 """return an uncompressed revision of a given node or revision
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79 number.
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80 """
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81 if isinstance(nodeorrev, int):
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82 rev = nodeorrev
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83 node = self.node(rev)
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84 else:
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85 node = nodeorrev
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86 rev = self.rev(node)
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87
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88 if node == nullid:
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89 return ""
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90
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91 if rev in self.basemap:
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92 text = self.revlog2.revision(node)
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93 self._cache = (node, rev, text)
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94 else:
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95 text = revlog.revlog.revision(self, rev)
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96 # already cached
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97 return text
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98
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99 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None):
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100 raise NotImplementedError
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101 def addgroup(self, revs, linkmapper, transaction):
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102 raise NotImplementedError
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103 def strip(self, rev, minlink):
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104 raise NotImplementedError
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105 def checksize(self):
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106 raise NotImplementedError
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107
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108 class unionchangelog(unionrevlog, changelog.changelog):
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109 def __init__(self, opener, opener2):
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110 changelog.changelog.__init__(self, opener)
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111 linkmapper = None
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112 changelog2 = changelog.changelog(opener2)
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113 unionrevlog.__init__(self, opener, self.indexfile, changelog2,
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114 linkmapper)
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115
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116 class unionmanifest(unionrevlog, manifest.manifest):
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117 def __init__(self, opener, opener2, linkmapper):
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118 manifest.manifest.__init__(self, opener)
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119 manifest2 = manifest.manifest(opener2)
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120 unionrevlog.__init__(self, opener, self.indexfile, manifest2,
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121 linkmapper)
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122
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123 class unionfilelog(unionrevlog, filelog.filelog):
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124 def __init__(self, opener, path, opener2, linkmapper, repo):
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125 filelog.filelog.__init__(self, opener, path)
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126 filelog2 = filelog.filelog(opener2, path)
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127 unionrevlog.__init__(self, opener, self.indexfile, filelog2,
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128 linkmapper)
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129 self._repo = repo
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130
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131 def _file(self, f):
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132 self._repo.file(f)
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133
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134 class unionpeer(localrepo.localpeer):
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135 def canpush(self):
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136 return False
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137
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138 class unionrepository(localrepo.localrepository):
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139 def __init__(self, ui, path, path2):
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140 localrepo.localrepository.__init__(self, ui, path)
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141 self.ui.setconfig('phases', 'publish', False)
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142
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143 self._url = 'union:%s+%s' % (util.expandpath(path),
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144 util.expandpath(path2))
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145 self.repo2 = localrepo.localrepository(ui, path2)
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146
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147 @util.propertycache
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148 def changelog(self):
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149 return unionchangelog(self.sopener, self.repo2.sopener)
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150
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151 def _clrev(self, rev2):
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152 """map from repo2 changelog rev to temporary rev in self.changelog"""
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153 node = self.repo2.changelog.node(rev2)
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154 return self.changelog.rev(node)
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155
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156 @util.propertycache
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157 def manifest(self):
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158 return unionmanifest(self.sopener, self.repo2.sopener,
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159 self._clrev)
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160
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161 def url(self):
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162 return self._url
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163
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164 def file(self, f):
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165 return unionfilelog(self.sopener, f, self.repo2.sopener,
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166 self._clrev, self)
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167
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168 def close(self):
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169 self.repo2.close()
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170
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171 def cancopy(self):
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172 return False
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173
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174 def peer(self):
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175 return unionpeer(self)
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176
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177 def instance(ui, path, create):
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178 u = util.url(path)
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179 assert u.scheme == 'union'
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180 repopath, repopath2 = u.path.split("+", 1)
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181 return unionrepository(ui, repopath, repopath2)