Mercurial > hg
annotate mercurial/unionrepo.py @ 40626:87a872555e90
revlog: detect incomplete revlog reads
_readsegment() is supposed to return N bytes of revlog revision
data starting at a file offset. Surprisingly, its behavior before
this patch never verified that it actually read and returned N
bytes! Instead, it would perform the read(), then return whatever
data was available. And even more surprisingly, nothing in the
call chain appears to have been validating that it received all
the data it was expecting.
This behavior could lead to partial or incomplete revision chunks
being operated on. This could result in e.g. cached deltas being
applied against incomplete base revisions. The delta application
process would happily perform this operation. Only hash
verification would detect the corruption and save us.
This commit changes the behavior of raw revlog reading to validate
that we actually read() the number of bytes that were requested.
We will raise a more specific error faster, rather than possibly
have it go undetected or manifest later in the call stack, at
delta application or hash verification.
Differential Revision: https://phab.mercurial-scm.org/D5266
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 13 Nov 2018 12:30:59 -0800 |
parents | 55db747a21ad |
children | 3913223417ea |
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 from .i18n import _ |
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17 from .node import nullid |
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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 class unionrevlog(revlog.revlog): |
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35 def __init__(self, opener, indexfile, revlog2, linkmapper): |
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36 # How it works: |
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37 # To retrieve a revision, we just need to know the node id so we can |
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38 # look it up in revlog2. |
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39 # |
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40 # To differentiate a rev in the second revlog from a rev in the revlog, |
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41 # we check revision against repotiprev. |
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42 opener = vfsmod.readonlyvfs(opener) |
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43 revlog.revlog.__init__(self, opener, indexfile) |
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44 self.revlog2 = revlog2 |
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45 |
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46 n = len(self) |
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47 self.repotiprev = n - 1 |
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48 self.bundlerevs = set() # used by 'bundle()' revset expression |
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49 for rev2 in self.revlog2: |
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50 rev = self.revlog2.index[rev2] |
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51 # rev numbers - in revlog2, very different from self.rev |
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52 _start, _csize, rsize, base, linkrev, p1rev, p2rev, node = rev |
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53 flags = _start & 0xFFFF |
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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 # TODO: it's probably wrong to set compressed length to None, but |
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73 # I have no idea if csize is valid in the base revlog context. |
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74 e = (flags, None, rsize, base, |
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75 link, self.rev(p1node), self.rev(p2node), node) |
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76 self.index.append(e) |
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77 self.nodemap[node] = n |
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78 self.bundlerevs.add(n) |
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79 n += 1 |
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80 |
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81 def _chunk(self, rev): |
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82 if rev <= self.repotiprev: |
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83 return revlog.revlog._chunk(self, rev) |
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84 return self.revlog2._chunk(self.node(rev)) |
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85 |
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86 def revdiff(self, rev1, rev2): |
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87 """return or calculate a delta between two revisions""" |
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88 if rev1 > self.repotiprev and rev2 > self.repotiprev: |
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89 return self.revlog2.revdiff( |
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90 self.revlog2.rev(self.node(rev1)), |
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91 self.revlog2.rev(self.node(rev2))) |
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92 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev: |
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93 return self.baserevdiff(rev1, rev2) |
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94 |
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95 return mdiff.textdiff(self.revision(rev1), self.revision(rev2)) |
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96 |
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97 def revision(self, nodeorrev, _df=None, raw=False): |
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98 """return an uncompressed revision of a given node or revision |
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99 number. |
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100 """ |
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101 if isinstance(nodeorrev, int): |
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102 rev = nodeorrev |
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103 node = self.node(rev) |
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104 else: |
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105 node = nodeorrev |
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106 rev = self.rev(node) |
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107 |
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108 if node == nullid: |
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109 return "" |
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110 |
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111 if rev > self.repotiprev: |
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112 text = self.revlog2.revision(node) |
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113 self._revisioncache = (node, rev, text) |
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114 else: |
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115 text = self.baserevision(rev) |
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116 # already cached |
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117 return text |
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118 |
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119 def baserevision(self, nodeorrev): |
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120 # Revlog subclasses may override 'revision' method to modify format of |
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121 # content retrieved from revlog. To use unionrevlog with such class one |
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122 # needs to override 'baserevision' and make more specific call here. |
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123 return revlog.revlog.revision(self, nodeorrev) |
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124 |
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125 def baserevdiff(self, rev1, rev2): |
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126 # Exists for the same purpose as baserevision. |
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127 return revlog.revlog.revdiff(self, rev1, rev2) |
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128 |
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129 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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130 raise NotImplementedError |
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131 def addgroup(self, deltas, transaction, addrevisioncb=None): |
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132 raise NotImplementedError |
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133 def strip(self, rev, minlink): |
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134 raise NotImplementedError |
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135 def checksize(self): |
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136 raise NotImplementedError |
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137 |
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138 class unionchangelog(unionrevlog, changelog.changelog): |
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139 def __init__(self, opener, opener2): |
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140 changelog.changelog.__init__(self, opener) |
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141 linkmapper = None |
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142 changelog2 = changelog.changelog(opener2) |
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143 unionrevlog.__init__(self, opener, self.indexfile, changelog2, |
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144 linkmapper) |
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145 |
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146 def baserevision(self, nodeorrev): |
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147 # Although changelog doesn't override 'revision' method, some extensions |
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148 # may replace this class with another that does. Same story with |
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149 # manifest and filelog classes. |
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150 return changelog.changelog.revision(self, nodeorrev) |
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151 |
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152 def baserevdiff(self, rev1, rev2): |
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153 return changelog.changelog.revdiff(self, rev1, rev2) |
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154 |
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155 class unionmanifest(unionrevlog, manifest.manifestrevlog): |
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156 def __init__(self, opener, opener2, linkmapper): |
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157 manifest.manifestrevlog.__init__(self, opener) |
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158 manifest2 = manifest.manifestrevlog(opener2) |
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159 unionrevlog.__init__(self, opener, self.indexfile, manifest2, |
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160 linkmapper) |
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161 |
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162 def baserevision(self, nodeorrev): |
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163 return manifest.manifestrevlog.revision(self, nodeorrev) |
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164 |
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165 def baserevdiff(self, rev1, rev2): |
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166 return manifest.manifestrevlog.revdiff(self, rev1, rev2) |
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167 |
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168 class unionfilelog(filelog.filelog): |
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169 def __init__(self, opener, path, opener2, linkmapper, repo): |
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170 filelog.filelog.__init__(self, opener, path) |
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171 filelog2 = filelog.filelog(opener2, path) |
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172 self._revlog = unionrevlog(opener, self.indexfile, |
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173 filelog2._revlog, linkmapper) |
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174 self._repo = repo |
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175 self.repotiprev = self._revlog.repotiprev |
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176 self.revlog2 = self._revlog.revlog2 |
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177 |
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178 def baserevision(self, nodeorrev): |
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179 return filelog.filelog.revision(self, nodeorrev) |
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180 |
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181 def baserevdiff(self, rev1, rev2): |
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182 return filelog.filelog.revdiff(self, rev1, rev2) |
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183 |
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184 def iscensored(self, rev): |
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185 """Check if a revision is censored.""" |
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186 if rev <= self.repotiprev: |
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187 return filelog.filelog.iscensored(self, rev) |
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188 node = self.node(rev) |
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189 return self.revlog2.iscensored(self.revlog2.rev(node)) |
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190 |
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191 class unionpeer(localrepo.localpeer): |
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192 def canpush(self): |
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193 return False |
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194 |
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195 class unionrepository(object): |
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196 """Represents the union of data in 2 repositories. |
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197 |
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198 Instances are not usable if constructed directly. Use ``instance()`` |
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199 or ``makeunionrepository()`` to create a usable instance. |
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200 """ |
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201 def __init__(self, repo2, url): |
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202 self.repo2 = repo2 |
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203 self._url = url |
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204 |
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205 self.ui.setconfig('phases', 'publish', False, 'unionrepo') |
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206 |
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207 @localrepo.unfilteredpropertycache |
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208 def changelog(self): |
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209 return unionchangelog(self.svfs, self.repo2.svfs) |
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210 |
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211 @localrepo.unfilteredpropertycache |
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212 def manifestlog(self): |
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213 rootstore = unionmanifest(self.svfs, self.repo2.svfs, |
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214 self.unfiltered()._clrev) |
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215 return manifest.manifestlog(self.svfs, self, rootstore) |
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216 |
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217 def _clrev(self, rev2): |
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218 """map from repo2 changelog rev to temporary rev in self.changelog""" |
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219 node = self.repo2.changelog.node(rev2) |
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220 return self.changelog.rev(node) |
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221 |
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222 def url(self): |
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223 return self._url |
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224 |
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225 def file(self, f): |
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226 return unionfilelog(self.svfs, f, self.repo2.svfs, |
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227 self.unfiltered()._clrev, self) |
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228 |
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229 def close(self): |
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230 self.repo2.close() |
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231 |
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232 def cancopy(self): |
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233 return False |
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234 |
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235 def peer(self): |
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236 return unionpeer(self) |
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237 |
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238 def getcwd(self): |
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239 return encoding.getcwd() # always outside the repo |
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240 |
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241 def instance(ui, path, create, intents=None, createopts=None): |
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242 if create: |
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243 raise error.Abort(_('cannot create new union repository')) |
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244 parentpath = ui.config("bundle", "mainreporoot") |
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245 if not parentpath: |
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246 # try to find the correct path to the working directory repo |
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247 parentpath = cmdutil.findrepo(encoding.getcwd()) |
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248 if parentpath is None: |
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249 parentpath = '' |
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250 if parentpath: |
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251 # Try to make the full path relative so we get a nice, short URL. |
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252 # In particular, we don't want temp dir names in test outputs. |
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253 cwd = encoding.getcwd() |
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254 if parentpath == cwd: |
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255 parentpath = '' |
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256 else: |
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257 cwd = pathutil.normasprefix(cwd) |
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258 if parentpath.startswith(cwd): |
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259 parentpath = parentpath[len(cwd):] |
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260 if path.startswith('union:'): |
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261 s = path.split(":", 1)[1].split("+", 1) |
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262 if len(s) == 1: |
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263 repopath, repopath2 = parentpath, s[0] |
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264 else: |
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265 repopath, repopath2 = s |
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266 else: |
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267 repopath, repopath2 = parentpath, path |
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268 |
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269 return makeunionrepository(ui, repopath, repopath2) |
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270 |
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271 def makeunionrepository(ui, repopath1, repopath2): |
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272 """Make a union repository object from 2 local repo paths.""" |
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273 repo1 = localrepo.instance(ui, repopath1, create=False) |
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274 repo2 = localrepo.instance(ui, repopath2, create=False) |
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275 |
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276 url = 'union:%s+%s' % (util.expandpath(repopath1), |
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277 util.expandpath(repopath2)) |
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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 |