Mercurial > hg
annotate mercurial/unionrepo.py @ 26755:bb0b955d050d
streamclone: support for producing and consuming stream clone bundles
Up to this point, stream clones only existed as a dynamically generated
data format produced and consumed during streaming clones. In order to
support this efficient cloning format with the clone bundles feature, we
need a more formal, on disk representation of the streaming clone data.
This patch introduces a new "bundle" type for streaming clones. Unlike
existing bundles, it does not contain changegroup data. It does,
however, share the same concepts like the 4 byte header which identifies
the type of data that follows and the 2 byte abbreviation for
compression types (of which only "UN" is currently supported).
The new bundle format is essentially the existing stream clone version 1
data format with some headers at the beginning.
Content negotiation at stream clone request time checked for repository
format/requirements compatibility before initiating a stream clone. We
can't do active content negotiation when using clone bundles. So, we put
this set of requirements inside the payload so consumers have a built-in
mechanism for checking compatibility before reading and applying lots of
data. Of course, we will also advertise this requirements set in clone
bundles. But that's for another patch.
We currently don't have a mechanism to produce and consume this new
bundle format. This will be implemented in upcoming patches.
It's worth noting that if a legacy client attempts to `hg unbundle` a
stream clone bundle (with the "HGS1" header), it will abort with:
"unknown bundle version S1," which seems appropriate.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 17 Oct 2015 11:14:52 -0700 |
parents | 56b2bcea2529 |
children | 12f727a5b434 bf86e3e87123 |
rev | line source |
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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 import os |
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17 |
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18 from .i18n import _ |
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19 from .node import nullid |
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20 |
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21 from . import ( |
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22 changelog, |
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23 cmdutil, |
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24 error, |
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25 filelog, |
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26 localrepo, |
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27 manifest, |
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28 mdiff, |
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29 pathutil, |
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30 revlog, |
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31 scmutil, |
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32 util, |
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33 ) |
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34 |
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35 class unionrevlog(revlog.revlog): |
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36 def __init__(self, opener, indexfile, revlog2, linkmapper): |
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37 # How it works: |
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38 # To retrieve a revision, we just need to know the node id so we can |
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39 # look it up in revlog2. |
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40 # |
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41 # To differentiate a rev in the second revlog from a rev in the revlog, |
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42 # we check revision against repotiprev. |
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43 opener = scmutil.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 |
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55 if linkmapper is None: # link is to same revlog |
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56 assert linkrev == rev2 # we never link back |
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57 link = n |
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58 else: # rev must be mapped from repo2 cl to unified cl by linkmapper |
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59 link = linkmapper(linkrev) |
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60 |
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61 if linkmapper is not None: # link is to same revlog |
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62 base = linkmapper(base) |
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63 |
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64 if node in self.nodemap: |
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65 # this happens for the common revlog revisions |
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66 self.bundlerevs.add(self.nodemap[node]) |
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67 continue |
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68 |
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69 p1node = self.revlog2.node(p1rev) |
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70 p2node = self.revlog2.node(p2rev) |
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71 |
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72 e = (None, None, None, base, |
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73 link, self.rev(p1node), self.rev(p2node), node) |
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74 self.index.insert(-1, e) |
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75 self.nodemap[node] = n |
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76 self.bundlerevs.add(n) |
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77 n += 1 |
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78 |
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79 def _chunk(self, rev): |
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80 if rev <= self.repotiprev: |
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81 return revlog.revlog._chunk(self, rev) |
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82 return self.revlog2._chunk(self.node(rev)) |
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83 |
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84 def revdiff(self, rev1, rev2): |
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85 """return or calculate a delta between two revisions""" |
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86 if rev1 > self.repotiprev and rev2 > self.repotiprev: |
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87 return self.revlog2.revdiff( |
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88 self.revlog2.rev(self.node(rev1)), |
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89 self.revlog2.rev(self.node(rev2))) |
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90 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev: |
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91 return self.baserevdiff(rev1, rev2) |
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92 |
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93 return mdiff.textdiff(self.revision(self.node(rev1)), |
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94 self.revision(self.node(rev2))) |
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95 |
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96 def revision(self, nodeorrev): |
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97 """return an uncompressed revision of a given node or revision |
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98 number. |
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99 """ |
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100 if isinstance(nodeorrev, int): |
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101 rev = nodeorrev |
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102 node = self.node(rev) |
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103 else: |
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104 node = nodeorrev |
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105 rev = self.rev(node) |
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106 |
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107 if node == nullid: |
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108 return "" |
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109 |
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110 if rev > self.repotiprev: |
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111 text = self.revlog2.revision(node) |
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112 self._cache = (node, rev, text) |
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113 else: |
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114 text = self.baserevision(rev) |
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115 # already cached |
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116 return text |
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117 |
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118 def baserevision(self, nodeorrev): |
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119 # Revlog subclasses may override 'revision' method to modify format of |
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120 # content retrieved from revlog. To use unionrevlog with such class one |
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121 # needs to override 'baserevision' and make more specific call here. |
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122 return revlog.revlog.revision(self, nodeorrev) |
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123 |
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124 def baserevdiff(self, rev1, rev2): |
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125 # Exists for the same purpose as baserevision. |
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126 return revlog.revlog.revdiff(self, rev1, rev2) |
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127 |
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128 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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129 raise NotImplementedError |
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130 def addgroup(self, revs, linkmapper, transaction): |
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131 raise NotImplementedError |
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132 def strip(self, rev, minlink): |
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133 raise NotImplementedError |
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134 def checksize(self): |
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135 raise NotImplementedError |
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136 |
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137 class unionchangelog(unionrevlog, changelog.changelog): |
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138 def __init__(self, opener, opener2): |
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139 changelog.changelog.__init__(self, opener) |
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140 linkmapper = None |
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141 changelog2 = changelog.changelog(opener2) |
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142 unionrevlog.__init__(self, opener, self.indexfile, changelog2, |
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143 linkmapper) |
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144 |
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145 def baserevision(self, nodeorrev): |
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146 # Although changelog doesn't override 'revision' method, some extensions |
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147 # may replace this class with another that does. Same story with |
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148 # manifest and filelog classes. |
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149 return changelog.changelog.revision(self, nodeorrev) |
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150 |
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151 def baserevdiff(self, rev1, rev2): |
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152 return changelog.changelog.revdiff(self, rev1, rev2) |
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153 |
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154 class unionmanifest(unionrevlog, manifest.manifest): |
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155 def __init__(self, opener, opener2, linkmapper): |
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156 manifest.manifest.__init__(self, opener) |
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157 manifest2 = manifest.manifest(opener2) |
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158 unionrevlog.__init__(self, opener, self.indexfile, manifest2, |
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159 linkmapper) |
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160 |
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161 def baserevision(self, nodeorrev): |
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162 return manifest.manifest.revision(self, nodeorrev) |
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163 |
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164 def baserevdiff(self, rev1, rev2): |
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165 return manifest.manifest.revdiff(self, rev1, rev2) |
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166 |
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167 class unionfilelog(unionrevlog, filelog.filelog): |
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168 def __init__(self, opener, path, opener2, linkmapper, repo): |
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169 filelog.filelog.__init__(self, opener, path) |
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170 filelog2 = filelog.filelog(opener2, path) |
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171 unionrevlog.__init__(self, opener, self.indexfile, filelog2, |
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172 linkmapper) |
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173 self._repo = repo |
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174 |
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175 def baserevision(self, nodeorrev): |
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176 return filelog.filelog.revision(self, nodeorrev) |
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177 |
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178 def baserevdiff(self, rev1, rev2): |
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179 return filelog.filelog.revdiff(self, rev1, rev2) |
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180 |
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181 def iscensored(self, rev): |
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182 """Check if a revision is censored.""" |
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183 if rev <= self.repotiprev: |
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184 return filelog.filelog.iscensored(self, rev) |
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185 return self.revlog2.iscensored(rev) |
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186 |
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187 class unionpeer(localrepo.localpeer): |
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188 def canpush(self): |
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189 return False |
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190 |
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191 class unionrepository(localrepo.localrepository): |
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192 def __init__(self, ui, path, path2): |
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193 localrepo.localrepository.__init__(self, ui, path) |
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194 self.ui.setconfig('phases', 'publish', False, 'unionrepo') |
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195 |
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196 self._url = 'union:%s+%s' % (util.expandpath(path), |
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197 util.expandpath(path2)) |
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198 self.repo2 = localrepo.localrepository(ui, path2) |
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199 |
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200 @localrepo.unfilteredpropertycache |
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201 def changelog(self): |
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202 return unionchangelog(self.svfs, self.repo2.svfs) |
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203 |
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204 def _clrev(self, rev2): |
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205 """map from repo2 changelog rev to temporary rev in self.changelog""" |
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206 node = self.repo2.changelog.node(rev2) |
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207 return self.changelog.rev(node) |
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208 |
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209 @localrepo.unfilteredpropertycache |
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210 def manifest(self): |
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211 return unionmanifest(self.svfs, self.repo2.svfs, |
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212 self._clrev) |
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213 |
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214 def url(self): |
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215 return self._url |
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216 |
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217 def file(self, f): |
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218 return unionfilelog(self.svfs, f, self.repo2.svfs, |
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219 self._clrev, self) |
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220 |
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221 def close(self): |
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222 self.repo2.close() |
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223 |
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224 def cancopy(self): |
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225 return False |
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226 |
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227 def peer(self): |
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228 return unionpeer(self) |
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229 |
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230 def getcwd(self): |
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231 return os.getcwd() # always outside the repo |
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232 |
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233 def instance(ui, path, create): |
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234 if create: |
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235 raise error.Abort(_('cannot create new union repository')) |
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236 parentpath = ui.config("bundle", "mainreporoot", "") |
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237 if not parentpath: |
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238 # try to find the correct path to the working directory repo |
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239 parentpath = cmdutil.findrepo(os.getcwd()) |
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240 if parentpath is None: |
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241 parentpath = '' |
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242 if parentpath: |
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243 # Try to make the full path relative so we get a nice, short URL. |
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244 # In particular, we don't want temp dir names in test outputs. |
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245 cwd = os.getcwd() |
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246 if parentpath == cwd: |
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247 parentpath = '' |
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248 else: |
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249 cwd = pathutil.normasprefix(cwd) |
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250 if parentpath.startswith(cwd): |
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251 parentpath = parentpath[len(cwd):] |
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252 if path.startswith('union:'): |
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253 s = path.split(":", 1)[1].split("+", 1) |
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254 if len(s) == 1: |
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255 repopath, repopath2 = parentpath, s[0] |
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256 else: |
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257 repopath, repopath2 = s |
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258 else: |
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259 repopath, repopath2 = parentpath, path |
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260 return unionrepository(ui, repopath, repopath2) |