Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/bundlerepo.py @ 4029:9210fba03d16
merge with -stable
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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date | Mon, 15 Jan 2007 18:23:21 +0100 |
parents | 540d1059c802 01d98d68d697 |
children | 1b5c38e9d7aa |
rev | line source |
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1942
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1 """ |
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2 bundlerepo.py - repository class for viewing uncompressed bundles |
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3 |
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4 This provides a read-only repository interface to bundles as if |
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5 they were part of the actual repository. |
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6 |
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7 Copyright 2006 Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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8 |
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9 This software may be used and distributed according to the terms |
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10 of the GNU General Public License, incorporated herein by reference. |
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11 """ |
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12 |
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13 from node import * |
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15 import changegroup, util, os, struct, bz2, tempfile |
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16 |
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17 import localrepo, changelog, manifest, filelog, revlog |
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18 |
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19 class bundlerevlog(revlog.revlog): |
1942
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20 def __init__(self, opener, indexfile, datafile, bundlefile, |
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21 linkmapper=None): |
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22 # How it works: |
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23 # to retrieve a revision, we need to know the offset of |
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24 # the revision in the bundlefile (an opened file). |
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25 # |
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26 # We store this offset in the index (start), to differentiate a |
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27 # rev in the bundle and from a rev in the revlog, we check |
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28 # len(index[r]). If the tuple is bigger than 7, it is a bundle |
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29 # (it is bigger since we store the node to which the delta is) |
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30 # |
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31 revlog.revlog.__init__(self, opener, indexfile, datafile) |
1942
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32 self.bundlefile = bundlefile |
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33 self.basemap = {} |
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34 def chunkpositer(): |
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35 for chunk in changegroup.chunkiter(bundlefile): |
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36 pos = bundlefile.tell() |
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37 yield chunk, pos - len(chunk) |
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38 n = self.count() |
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39 prev = None |
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40 for chunk, start in chunkpositer(): |
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41 size = len(chunk) |
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42 if size < 80: |
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43 raise util.Abort("invalid changegroup") |
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44 start += 80 |
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45 size -= 80 |
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46 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) |
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47 if node in self.nodemap: |
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48 prev = node |
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49 continue |
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50 for p in (p1, p2): |
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51 if not p in self.nodemap: |
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52 raise revlog.LookupError(_("unknown parent %s") % short(p1)) |
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53 if linkmapper is None: |
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54 link = n |
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55 else: |
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56 link = linkmapper(cs) |
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57 |
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58 if not prev: |
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59 prev = p1 |
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60 # start, size, base is not used, link, p1, p2, delta ref |
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61 if self.version == revlog.REVLOGV0: |
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62 e = (start, size, None, link, p1, p2, node) |
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63 else: |
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64 e = (self.offset_type(start, 0), size, -1, None, link, |
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65 self.rev(p1), self.rev(p2), node) |
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66 self.basemap[n] = prev |
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67 self.index.append(e) |
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68 self.nodemap[node] = n |
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69 prev = node |
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70 n += 1 |
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71 |
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72 def bundle(self, rev): |
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73 """is rev from the bundle""" |
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74 if rev < 0: |
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75 return False |
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76 return rev in self.basemap |
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77 def bundlebase(self, rev): return self.basemap[rev] |
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78 def chunk(self, rev, df=None, cachelen=4096): |
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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, df, cachelen) |
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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 self.diff(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: return "" |
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103 |
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104 text = None |
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105 chain = [] |
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106 iter_node = node |
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107 rev = self.rev(iter_node) |
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108 # reconstruct the revision if it is from a changegroup |
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109 while self.bundle(rev): |
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110 if self.cache and self.cache[0] == iter_node: |
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111 text = self.cache[2] |
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112 break |
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113 chain.append(rev) |
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114 iter_node = self.bundlebase(rev) |
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115 rev = self.rev(iter_node) |
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116 if text is None: |
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117 text = revlog.revlog.revision(self, iter_node) |
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118 |
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119 while chain: |
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120 delta = self.chunk(chain.pop()) |
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121 text = self.patches(text, [delta]) |
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122 |
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123 p1, p2 = self.parents(node) |
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124 if node != revlog.hash(text, p1, p2): |
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125 raise revlog.RevlogError(_("integrity check failed on %s:%d") |
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126 % (self.datafile, self.rev(node))) |
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127 |
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128 self.cache = (node, self.rev(node), text) |
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129 return text |
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130 |
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131 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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132 raise NotImplementedError |
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133 def addgroup(self, revs, linkmapper, transaction, unique=0): |
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134 raise NotImplementedError |
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135 def strip(self, rev, minlink): |
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136 raise NotImplementedError |
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137 def checksize(self): |
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138 raise NotImplementedError |
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139 |
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140 class bundlechangelog(bundlerevlog, changelog.changelog): |
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141 def __init__(self, opener, bundlefile): |
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142 changelog.changelog.__init__(self, opener) |
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143 bundlerevlog.__init__(self, opener, self.indexfile, self.datafile, |
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144 bundlefile) |
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145 |
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146 class bundlemanifest(bundlerevlog, manifest.manifest): |
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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, self.datafile, |
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150 bundlefile, 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, self.datafile, |
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156 bundlefile, 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 localrepo.localrepository.__init__(self, ui, path) |
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161 |
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162 self._url = 'bundle:' + bundlename |
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163 if path: self._url += '+' + path |
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164 |
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165 self.tempfile = None |
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166 self.bundlefile = open(bundlename, "rb") |
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167 header = self.bundlefile.read(6) |
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168 if not header.startswith("HG"): |
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169 raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename) |
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170 elif not header.startswith("HG10"): |
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171 raise util.Abort(_("%s: unknown bundle version") % bundlename) |
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172 elif header == "HG10BZ": |
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173 fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-", |
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174 suffix=".hg10un", dir=self.path) |
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175 self.tempfile = temp |
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176 fptemp = os.fdopen(fdtemp, 'wb') |
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177 def generator(f): |
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178 zd = bz2.BZ2Decompressor() |
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179 zd.decompress("BZ") |
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180 for chunk in f: |
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181 yield zd.decompress(chunk) |
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182 gen = generator(util.filechunkiter(self.bundlefile, 4096)) |
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183 |
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184 try: |
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185 fptemp.write("HG10UN") |
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186 for chunk in gen: |
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187 fptemp.write(chunk) |
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188 finally: |
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189 fptemp.close() |
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190 self.bundlefile.close() |
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191 |
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192 self.bundlefile = open(self.tempfile, "rb") |
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193 # seek right after the header |
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194 self.bundlefile.seek(6) |
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195 elif header == "HG10UN": |
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196 # nothing to do |
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197 pass |
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198 else: |
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199 raise util.Abort(_("%s: unknown bundle compression type") |
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200 % bundlename) |
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201 self.changelog = bundlechangelog(self.sopener, self.bundlefile) |
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202 self.manifest = bundlemanifest(self.sopener, self.bundlefile, |
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203 self.changelog.rev) |
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204 # dict with the mapping 'filename' -> position in the bundle |
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205 self.bundlefilespos = {} |
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206 while 1: |
1981
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207 f = changegroup.getchunk(self.bundlefile) |
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208 if not f: |
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209 break |
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210 self.bundlefilespos[f] = self.bundlefile.tell() |
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211 for c in changegroup.chunkiter(self.bundlefile): |
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212 pass |
1942
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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 |
1942
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217 def dev(self): |
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218 return -1 |
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219 |
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220 def file(self, f): |
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221 if f[0] == '/': |
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222 f = f[1:] |
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223 if f in self.bundlefilespos: |
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224 self.bundlefile.seek(self.bundlefilespos[f]) |
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225 return bundlefilelog(self.sopener, f, self.bundlefile, |
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226 self.changelog.rev) |
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227 else: |
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228 return filelog.filelog(self.sopener, f) |
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229 |
1971
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230 def close(self): |
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231 """Close assigned bundle file immediately.""" |
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232 self.bundlefile.close() |
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233 |
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234 def __del__(self): |
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235 bundlefile = getattr(self, 'bundlefile', None) |
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236 if bundlefile and not bundlefile.closed: |
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237 bundlefile.close() |
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238 tempfile = getattr(self, 'tempfile', None) |
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239 if tempfile is not None: |
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240 os.unlink(tempfile) |
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241 |
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242 def instance(ui, path, create): |
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243 if create: |
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244 raise util.Abort(_('cannot create new bundle repository')) |
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245 path = util.drop_scheme('file', path) |
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246 if path.startswith('bundle:'): |
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247 path = util.drop_scheme('bundle', path) |
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248 s = path.split("+", 1) |
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249 if len(s) == 1: |
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250 repopath, bundlename = "", s[0] |
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251 else: |
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252 repopath, bundlename = s |
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253 else: |
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254 repopath, bundlename = '', path |
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255 return bundlerepository(ui, repopath, bundlename) |