Mercurial > hg
annotate mercurial/bundlerepo.py @ 11791:00cde9bddbe4
repair: do not compress partial bundle if we do not keep it on disk
A partial bundle is created to temporarily save revisions > rev but
not descending from the node to strip, to be able to restore the
changesets after stripping the changelog.
Since this bundle is not kept after the strip operation, and is not
user-visible, it is not necessary and should be faster to avoid
compression.
author | Nicolas Dumazet <nicdumz.commits@gmail.com> |
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date | Thu, 12 Aug 2010 16:53:23 +0900 |
parents | 17031fea4e95 |
children | bcc7139521b7 |
rev | line source |
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1 # bundlerepo.py - repository class for viewing uncompressed bundles |
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2 # |
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3 # Copyright 2006, 2007 Benoit Boissinot <bboissin@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 """Repository class for viewing uncompressed bundles. |
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9 |
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10 This provides a read-only repository interface to bundles as if they |
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11 were part of the actual repository. |
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12 """ |
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13 |
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14 from node import nullid |
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16 import os, struct, bz2, zlib, tempfile, shutil |
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17 import changegroup, util, mdiff |
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18 import localrepo, changelog, manifest, filelog, revlog, error |
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19 |
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20 class bundlerevlog(revlog.revlog): |
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21 def __init__(self, opener, indexfile, bundlefile, |
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22 linkmapper=None): |
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23 # How it works: |
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24 # to retrieve a revision, we need to know the offset of |
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25 # the revision in the bundlefile (an opened file). |
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26 # |
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27 # We store this offset in the index (start), to differentiate a |
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28 # rev in the bundle and from a rev in the revlog, we check |
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29 # len(index[r]). If the tuple is bigger than 7, it is a bundle |
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30 # (it is bigger since we store the node to which the delta is) |
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31 # |
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32 revlog.revlog.__init__(self, opener, indexfile) |
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33 self.bundlefile = bundlefile |
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34 self.basemap = {} |
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35 def chunkpositer(): |
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36 for chunk in changegroup.chunkiter(bundlefile): |
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37 pos = bundlefile.tell() |
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38 yield chunk, pos - len(chunk) |
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39 n = len(self) |
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40 prev = None |
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41 for chunk, start in chunkpositer(): |
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42 size = len(chunk) |
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43 if size < 80: |
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44 raise util.Abort(_("invalid changegroup")) |
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45 start += 80 |
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46 size -= 80 |
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47 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) |
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48 if node in self.nodemap: |
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49 prev = node |
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50 continue |
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51 for p in (p1, p2): |
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52 if not p in self.nodemap: |
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53 raise error.LookupError(p, self.indexfile, |
7633 | 54 _("unknown parent")) |
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55 if linkmapper is None: |
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56 link = n |
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57 else: |
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58 link = linkmapper(cs) |
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59 |
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60 if not prev: |
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61 prev = p1 |
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62 # start, size, full unc. size, base (unused), link, p1, p2, node |
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63 e = (revlog.offset_type(start, 0), size, -1, -1, link, |
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64 self.rev(p1), self.rev(p2), node) |
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65 self.basemap[n] = prev |
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66 self.index.insert(-1, e) |
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67 self.nodemap[node] = n |
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68 prev = node |
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69 n += 1 |
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70 |
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71 def bundle(self, rev): |
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72 """is rev from the bundle""" |
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73 if rev < 0: |
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74 return False |
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75 return rev in self.basemap |
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76 def bundlebase(self, rev): |
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77 return self.basemap[rev] |
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78 def _chunk(self, rev): |
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79 # Warning: in case of bundle, the diff is against bundlebase, |
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80 # not against rev - 1 |
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81 # XXX: could use some caching |
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82 if not self.bundle(rev): |
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83 return revlog.revlog._chunk(self, rev) |
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84 self.bundlefile.seek(self.start(rev)) |
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85 return self.bundlefile.read(self.length(rev)) |
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86 |
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87 def revdiff(self, rev1, rev2): |
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88 """return or calculate a delta between two revisions""" |
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89 if self.bundle(rev1) and self.bundle(rev2): |
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90 # hot path for bundle |
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91 revb = self.rev(self.bundlebase(rev2)) |
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92 if revb == rev1: |
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93 return self._chunk(rev2) |
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94 elif not self.bundle(rev1) and not self.bundle(rev2): |
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95 return revlog.revlog.revdiff(self, rev1, rev2) |
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96 |
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97 return mdiff.textdiff(self.revision(self.node(rev1)), |
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98 self.revision(self.node(rev2))) |
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99 |
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100 def revision(self, node): |
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101 """return an uncompressed revision of a given""" |
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102 if node == nullid: |
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103 return "" |
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104 |
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105 text = None |
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106 chain = [] |
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107 iter_node = node |
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108 rev = self.rev(iter_node) |
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109 # reconstruct the revision if it is from a changegroup |
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110 while self.bundle(rev): |
4984 | 111 if self._cache and self._cache[0] == iter_node: |
112 text = self._cache[2] | |
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113 break |
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114 chain.append(rev) |
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115 iter_node = self.bundlebase(rev) |
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116 rev = self.rev(iter_node) |
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117 if text is None: |
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118 text = revlog.revlog.revision(self, iter_node) |
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119 |
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120 while chain: |
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121 delta = self._chunk(chain.pop()) |
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122 text = mdiff.patches(text, [delta]) |
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123 |
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124 p1, p2 = self.parents(node) |
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125 if node != revlog.hash(text, p1, p2): |
7633 | 126 raise error.RevlogError(_("integrity check failed on %s:%d") |
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127 % (self.datafile, self.rev(node))) |
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128 |
4984 | 129 self._cache = (node, self.rev(node), text) |
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130 return text |
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131 |
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132 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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133 raise NotImplementedError |
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134 def addgroup(self, revs, linkmapper, transaction): |
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135 raise NotImplementedError |
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136 def strip(self, rev, minlink): |
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137 raise NotImplementedError |
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138 def checksize(self): |
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139 raise NotImplementedError |
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140 |
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141 class bundlechangelog(bundlerevlog, changelog.changelog): |
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142 def __init__(self, opener, bundlefile): |
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143 changelog.changelog.__init__(self, opener) |
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144 bundlerevlog.__init__(self, opener, self.indexfile, bundlefile) |
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145 |
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146 class bundlemanifest(bundlerevlog, manifest.manifest): |
1942
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147 def __init__(self, opener, bundlefile, linkmapper): |
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148 manifest.manifest.__init__(self, opener) |
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149 bundlerevlog.__init__(self, opener, self.indexfile, bundlefile, |
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150 linkmapper) |
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151 |
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152 class bundlefilelog(bundlerevlog, filelog.filelog): |
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153 def __init__(self, opener, path, bundlefile, linkmapper): |
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154 filelog.filelog.__init__(self, opener, path) |
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155 bundlerevlog.__init__(self, opener, self.indexfile, bundlefile, |
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156 linkmapper) |
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157 |
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158 class bundlerepository(localrepo.localrepository): |
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159 def __init__(self, ui, path, bundlename): |
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160 self._tempparent = None |
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161 try: |
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162 localrepo.localrepository.__init__(self, ui, path) |
7637 | 163 except error.RepoError: |
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164 self._tempparent = tempfile.mkdtemp() |
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165 localrepo.instance(ui, self._tempparent, 1) |
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166 localrepo.localrepository.__init__(self, ui, self._tempparent) |
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167 |
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168 if path: |
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169 self._url = 'bundle:' + util.expandpath(path) + '+' + bundlename |
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170 else: |
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171 self._url = 'bundle:' + bundlename |
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172 |
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173 self.tempfile = None |
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174 self.bundlefile = open(bundlename, "rb") |
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175 header = self.bundlefile.read(6) |
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176 if not header.startswith("HG"): |
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177 raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename) |
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178 elif not header.startswith("HG10"): |
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179 raise util.Abort(_("%s: unknown bundle version") % bundlename) |
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180 elif (header == "HG10BZ") or (header == "HG10GZ"): |
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181 fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-", |
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182 suffix=".hg10un", dir=self.path) |
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183 self.tempfile = temp |
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184 fptemp = os.fdopen(fdtemp, 'wb') |
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185 def generator(f): |
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186 if header == "HG10BZ": |
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187 zd = bz2.BZ2Decompressor() |
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188 zd.decompress("BZ") |
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189 elif header == "HG10GZ": |
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190 zd = zlib.decompressobj() |
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191 for chunk in f: |
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192 yield zd.decompress(chunk) |
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193 gen = generator(util.filechunkiter(self.bundlefile, 4096)) |
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194 |
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195 try: |
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196 fptemp.write("HG10UN") |
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197 for chunk in gen: |
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198 fptemp.write(chunk) |
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199 finally: |
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200 fptemp.close() |
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201 self.bundlefile.close() |
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202 |
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203 self.bundlefile = open(self.tempfile, "rb") |
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204 # seek right after the header |
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205 self.bundlefile.seek(6) |
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206 elif header == "HG10UN": |
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207 # nothing to do |
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208 pass |
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209 else: |
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210 raise util.Abort(_("%s: unknown bundle compression type") |
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211 % bundlename) |
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212 # dict with the mapping 'filename' -> position in the bundle |
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213 self.bundlefilespos = {} |
5262 | 214 |
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215 @util.propertycache |
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216 def changelog(self): |
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217 c = bundlechangelog(self.sopener, self.bundlefile) |
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218 self.manstart = self.bundlefile.tell() |
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219 return c |
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220 |
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221 @util.propertycache |
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222 def manifest(self): |
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223 self.bundlefile.seek(self.manstart) |
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224 m = bundlemanifest(self.sopener, self.bundlefile, self.changelog.rev) |
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225 self.filestart = self.bundlefile.tell() |
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226 return m |
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227 |
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228 @util.propertycache |
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229 def manstart(self): |
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230 self.changelog |
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231 return self.manstart |
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232 |
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233 @util.propertycache |
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234 def filestart(self): |
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235 self.manifest |
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236 return self.filestart |
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237 |
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238 def url(self): |
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239 return self._url |
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240 |
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241 def file(self, f): |
5262 | 242 if not self.bundlefilespos: |
243 self.bundlefile.seek(self.filestart) | |
244 while 1: | |
245 chunk = changegroup.getchunk(self.bundlefile) | |
246 if not chunk: | |
247 break | |
248 self.bundlefilespos[chunk] = self.bundlefile.tell() | |
249 for c in changegroup.chunkiter(self.bundlefile): | |
250 pass | |
251 | |
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252 if f[0] == '/': |
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253 f = f[1:] |
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254 if f in self.bundlefilespos: |
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255 self.bundlefile.seek(self.bundlefilespos[f]) |
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256 return bundlefilelog(self.sopener, f, self.bundlefile, |
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257 self.changelog.rev) |
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258 else: |
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259 return filelog.filelog(self.sopener, f) |
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260 |
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261 def close(self): |
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262 """Close assigned bundle file immediately.""" |
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263 self.bundlefile.close() |
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264 |
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265 def __del__(self): |
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266 bundlefile = getattr(self, 'bundlefile', None) |
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267 if bundlefile and not bundlefile.closed: |
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268 bundlefile.close() |
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269 tempfile = getattr(self, 'tempfile', None) |
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270 if tempfile is not None: |
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271 os.unlink(tempfile) |
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272 if self._tempparent: |
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273 shutil.rmtree(self._tempparent, True) |
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274 |
6315 | 275 def cancopy(self): |
276 return False | |
277 | |
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278 def getcwd(self): |
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279 return os.getcwd() # always outside the repo |
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280 |
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281 def instance(ui, path, create): |
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282 if create: |
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283 raise util.Abort(_('cannot create new bundle repository')) |
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284 parentpath = ui.config("bundle", "mainreporoot", "") |
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285 if parentpath: |
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286 # Try to make the full path relative so we get a nice, short URL. |
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287 # In particular, we don't want temp dir names in test outputs. |
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288 cwd = os.getcwd() |
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289 if parentpath == cwd: |
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290 parentpath = '' |
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291 else: |
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292 cwd = os.path.join(cwd,'') |
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293 if parentpath.startswith(cwd): |
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294 parentpath = parentpath[len(cwd):] |
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295 path = util.drop_scheme('file', path) |
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296 if path.startswith('bundle:'): |
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297 path = util.drop_scheme('bundle', path) |
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298 s = path.split("+", 1) |
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299 if len(s) == 1: |
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300 repopath, bundlename = parentpath, s[0] |
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301 else: |
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302 repopath, bundlename = s |
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303 else: |
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304 repopath, bundlename = parentpath, path |
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305 return bundlerepository(ui, repopath, bundlename) |