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annotate mercurial/bundlerepo.py @ 9183:d0225fa2f6c4
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author | Martin Geisler <mg@lazybytes.net> |
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date | Wed, 22 Jul 2009 22:50:34 +0200 |
parents | b87a50b7125c |
children | 061eeb602354 |
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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 |
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6 # GNU General Public License version 2, incorporated herein by reference. |
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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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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): return self.basemap[rev] |
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77 def chunk(self, rev, df=None, cachelen=4096): |
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78 # Warning: in case of bundle, the diff is against bundlebase, |
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79 # not against rev - 1 |
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80 # XXX: could use some caching |
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81 if not self.bundle(rev): |
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82 return revlog.revlog.chunk(self, rev, df) |
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83 self.bundlefile.seek(self.start(rev)) |
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84 return self.bundlefile.read(self.length(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 self.bundle(rev1) and self.bundle(rev2): |
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89 # hot path for bundle |
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90 revb = self.rev(self.bundlebase(rev2)) |
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91 if revb == rev1: |
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92 return self.chunk(rev2) |
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93 elif not self.bundle(rev1) and not self.bundle(rev2): |
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94 return revlog.revlog.revdiff(self, rev1, rev2) |
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95 |
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96 return mdiff.textdiff(self.revision(self.node(rev1)), |
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97 self.revision(self.node(rev2))) |
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98 |
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99 def revision(self, node): |
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100 """return an uncompressed revision of a given""" |
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101 if node == nullid: return "" |
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102 |
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103 text = None |
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104 chain = [] |
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105 iter_node = node |
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106 rev = self.rev(iter_node) |
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107 # reconstruct the revision if it is from a changegroup |
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108 while self.bundle(rev): |
4984 | 109 if self._cache and self._cache[0] == iter_node: |
110 text = self._cache[2] | |
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111 break |
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112 chain.append(rev) |
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113 iter_node = self.bundlebase(rev) |
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114 rev = self.rev(iter_node) |
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115 if text is None: |
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116 text = revlog.revlog.revision(self, iter_node) |
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117 |
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118 while chain: |
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119 delta = self.chunk(chain.pop()) |
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120 text = mdiff.patches(text, [delta]) |
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121 |
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122 p1, p2 = self.parents(node) |
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123 if node != revlog.hash(text, p1, p2): |
7633 | 124 raise error.RevlogError(_("integrity check failed on %s:%d") |
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125 % (self.datafile, self.rev(node))) |
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126 |
4984 | 127 self._cache = (node, self.rev(node), text) |
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128 return text |
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129 |
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130 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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131 raise NotImplementedError |
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132 def addgroup(self, revs, linkmapper, transaction): |
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133 raise NotImplementedError |
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134 def strip(self, rev, minlink): |
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135 raise NotImplementedError |
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136 def checksize(self): |
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137 raise NotImplementedError |
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138 |
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139 class bundlechangelog(bundlerevlog, changelog.changelog): |
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140 def __init__(self, opener, bundlefile): |
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141 changelog.changelog.__init__(self, opener) |
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142 bundlerevlog.__init__(self, opener, self.indexfile, bundlefile) |
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143 |
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144 class bundlemanifest(bundlerevlog, manifest.manifest): |
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145 def __init__(self, opener, bundlefile, linkmapper): |
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146 manifest.manifest.__init__(self, opener) |
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147 bundlerevlog.__init__(self, opener, self.indexfile, bundlefile, |
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148 linkmapper) |
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149 |
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150 class bundlefilelog(bundlerevlog, filelog.filelog): |
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151 def __init__(self, opener, path, bundlefile, linkmapper): |
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152 filelog.filelog.__init__(self, opener, path) |
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153 bundlerevlog.__init__(self, opener, self.indexfile, bundlefile, |
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154 linkmapper) |
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155 |
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156 class bundlerepository(localrepo.localrepository): |
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157 def __init__(self, ui, path, bundlename): |
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158 self._tempparent = None |
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159 try: |
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160 localrepo.localrepository.__init__(self, ui, path) |
7637 | 161 except error.RepoError: |
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162 self._tempparent = tempfile.mkdtemp() |
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163 localrepo.instance(ui,self._tempparent,1) |
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164 localrepo.localrepository.__init__(self, ui, self._tempparent) |
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165 |
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166 if path: |
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167 self._url = 'bundle:' + path + '+' + bundlename |
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168 else: |
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169 self._url = 'bundle:' + bundlename |
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170 |
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171 self.tempfile = None |
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172 self.bundlefile = open(bundlename, "rb") |
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173 header = self.bundlefile.read(6) |
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174 if not header.startswith("HG"): |
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175 raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename) |
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176 elif not header.startswith("HG10"): |
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177 raise util.Abort(_("%s: unknown bundle version") % bundlename) |
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178 elif (header == "HG10BZ") or (header == "HG10GZ"): |
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179 fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-", |
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180 suffix=".hg10un", dir=self.path) |
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181 self.tempfile = temp |
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182 fptemp = os.fdopen(fdtemp, 'wb') |
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183 def generator(f): |
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184 if header == "HG10BZ": |
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185 zd = bz2.BZ2Decompressor() |
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186 zd.decompress("BZ") |
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187 elif header == "HG10GZ": |
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188 zd = zlib.decompressobj() |
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189 for chunk in f: |
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190 yield zd.decompress(chunk) |
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191 gen = generator(util.filechunkiter(self.bundlefile, 4096)) |
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192 |
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193 try: |
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194 fptemp.write("HG10UN") |
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195 for chunk in gen: |
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196 fptemp.write(chunk) |
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197 finally: |
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198 fptemp.close() |
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199 self.bundlefile.close() |
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200 |
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201 self.bundlefile = open(self.tempfile, "rb") |
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202 # seek right after the header |
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203 self.bundlefile.seek(6) |
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204 elif header == "HG10UN": |
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205 # nothing to do |
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206 pass |
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207 else: |
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208 raise util.Abort(_("%s: unknown bundle compression type") |
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209 % bundlename) |
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210 # dict with the mapping 'filename' -> position in the bundle |
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211 self.bundlefilespos = {} |
5262 | 212 |
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213 @util.propertycache |
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214 def changelog(self): |
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215 c = bundlechangelog(self.sopener, self.bundlefile) |
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216 self.manstart = self.bundlefile.tell() |
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217 return c |
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218 |
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219 @util.propertycache |
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220 def manifest(self): |
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221 self.bundlefile.seek(self.manstart) |
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222 m = bundlemanifest(self.sopener, self.bundlefile, self.changelog.rev) |
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223 self.filestart = self.bundlefile.tell() |
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224 return m |
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225 |
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226 @util.propertycache |
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227 def manstart(self): |
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228 self.changelog |
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229 return self.manstart |
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230 |
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231 @util.propertycache |
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232 def filestart(self): |
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233 self.manifest |
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234 return self.filestart |
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235 |
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236 def url(self): |
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237 return self._url |
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238 |
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239 def file(self, f): |
5262 | 240 if not self.bundlefilespos: |
241 self.bundlefile.seek(self.filestart) | |
242 while 1: | |
243 chunk = changegroup.getchunk(self.bundlefile) | |
244 if not chunk: | |
245 break | |
246 self.bundlefilespos[chunk] = self.bundlefile.tell() | |
247 for c in changegroup.chunkiter(self.bundlefile): | |
248 pass | |
249 | |
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250 if f[0] == '/': |
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251 f = f[1:] |
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252 if f in self.bundlefilespos: |
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253 self.bundlefile.seek(self.bundlefilespos[f]) |
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254 return bundlefilelog(self.sopener, f, self.bundlefile, |
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255 self.changelog.rev) |
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256 else: |
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257 return filelog.filelog(self.sopener, f) |
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258 |
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259 def close(self): |
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260 """Close assigned bundle file immediately.""" |
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261 self.bundlefile.close() |
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262 |
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263 def __del__(self): |
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264 bundlefile = getattr(self, 'bundlefile', None) |
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265 if bundlefile and not bundlefile.closed: |
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266 bundlefile.close() |
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267 tempfile = getattr(self, 'tempfile', None) |
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268 if tempfile is not None: |
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269 os.unlink(tempfile) |
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270 if self._tempparent: |
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271 shutil.rmtree(self._tempparent, True) |
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272 |
6315 | 273 def cancopy(self): |
274 return False | |
275 | |
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276 def getcwd(self): |
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277 return os.getcwd() # always outside the repo |
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278 |
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279 def instance(ui, path, create): |
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280 if create: |
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281 raise util.Abort(_('cannot create new bundle repository')) |
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282 parentpath = ui.config("bundle", "mainreporoot", "") |
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283 if parentpath: |
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284 # Try to make the full path relative so we get a nice, short URL. |
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285 # In particular, we don't want temp dir names in test outputs. |
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286 cwd = os.getcwd() |
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287 if parentpath == cwd: |
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288 parentpath = '' |
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289 else: |
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290 cwd = os.path.join(cwd,'') |
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291 if parentpath.startswith(cwd): |
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292 parentpath = parentpath[len(cwd):] |
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293 path = util.drop_scheme('file', path) |
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294 if path.startswith('bundle:'): |
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295 path = util.drop_scheme('bundle', path) |
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296 s = path.split("+", 1) |
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297 if len(s) == 1: |
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298 repopath, bundlename = parentpath, s[0] |
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299 else: |
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300 repopath, bundlename = s |
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301 else: |
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302 repopath, bundlename = parentpath, path |
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303 return bundlerepository(ui, repopath, bundlename) |