Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/bundlerepo.py @ 1971:915b81a35e46
imported patch /home/thomas/fix-incoming-abortion4.patch
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Sat, 18 Mar 2006 09:13:27 +0100 |
parents | 9fee186f7f0d |
children | dfb796786337 |
rev | line source |
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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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14 from i18n import gettext as _ |
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15 from demandload import demandload |
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16 demandload(globals(), "util os struct") |
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17 |
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18 import localrepo, changelog, manifest, filelog, revlog |
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19 |
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20 def getchunk(source): |
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21 """get a chunk from a group""" |
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22 d = source.read(4) |
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23 if not d: |
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24 return "" |
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25 l = struct.unpack(">l", d)[0] |
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26 if l <= 4: |
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27 return "" |
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28 d = source.read(l - 4) |
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29 if len(d) < l - 4: |
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30 raise util.Abort(_("premature EOF reading chunk" |
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31 " (got %d bytes, expected %d)") |
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32 % (len(d), l - 4)) |
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33 return d |
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34 |
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35 class bundlerevlog(revlog.revlog): |
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36 def __init__(self, opener, indexfile, datafile, bundlefile, |
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37 linkmapper=None): |
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38 # How it works: |
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39 # to retrieve a revision, we need to know the offset of |
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40 # the revision in the bundlefile (an opened file). |
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41 # |
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42 # We store this offset in the index (start), to differentiate a |
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43 # rev in the bundle and from a rev in the revlog, we check |
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44 # len(index[r]). If the tuple is bigger than 7, it is a bundle |
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45 # (it is bigger since we store the node to which the delta is) |
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46 # |
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47 revlog.revlog.__init__(self, opener, indexfile, datafile) |
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48 self.bundlefile = bundlefile |
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49 def genchunk(): |
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50 while 1: |
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51 pos = bundlefile.tell() |
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52 chunk = getchunk(bundlefile) |
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53 if not chunk: |
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54 break |
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55 yield chunk, pos + 4 # XXX struct.calcsize(">l") == 4 |
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56 n = self.count() |
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57 prev = None |
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58 for chunk, start in genchunk(): |
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59 size = len(chunk) |
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60 if size < 80: |
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61 raise util.Abort("invalid changegroup") |
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62 start += 80 |
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63 size -= 80 |
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64 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) |
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65 if node in self.nodemap: |
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66 prev = node |
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67 continue |
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68 for p in (p1, p2): |
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69 if not p in self.nodemap: |
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70 raise RevlogError(_("unknown parent %s") % short(p1)) |
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71 if linkmapper is None: |
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72 link = n |
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73 else: |
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74 link = linkmapper(cs) |
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75 |
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76 if not prev: |
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77 prev = p1 |
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78 # start, size, base is not used, link, p1, p2, delta ref |
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79 e = (start, size, None, link, p1, p2, node, prev) |
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80 self.index.append(e) |
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81 self.nodemap[node] = n |
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82 prev = node |
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83 n += 1 |
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84 |
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85 def bundle(self, rev): |
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86 """is rev from the bundle""" |
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87 if rev < 0: |
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88 return False |
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89 return len(self.index[rev]) > 7 |
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90 def bundlebase(self, rev): return self.index[rev][7] |
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91 def chunk(self, rev): |
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92 # Warning: in case of bundle, the diff is against bundlebase, |
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93 # not against rev - 1 |
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94 # XXX: could use some caching |
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95 if not self.bundle(rev): |
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96 return revlog.revlog.chunk(self, rev) |
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97 self.bundlefile.seek(self.start(rev)) |
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98 return self.bundlefile.read(self.length(rev)) |
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99 |
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100 def revdiff(self, rev1, rev2): |
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101 """return or calculate a delta between two revisions""" |
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102 if self.bundle(rev1) and self.bundle(rev2): |
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103 # hot path for bundle |
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104 revb = self.rev(self.bundlebase(rev2)) |
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105 if revb == rev1: |
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106 return self.chunk(rev2) |
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107 elif not self.bundle(rev1) and not self.bundle(rev2): |
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108 return revlog.revlog.chunk(self, rev1, rev2) |
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109 |
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110 return self.diff(self.revision(self.node(rev1)), |
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111 self.revision(self.node(rev2))) |
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112 |
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113 def revision(self, node): |
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114 """return an uncompressed revision of a given""" |
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115 if node == nullid: return "" |
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116 |
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117 text = None |
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118 chain = [] |
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119 iter_node = node |
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120 rev = self.rev(iter_node) |
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121 # reconstruct the revision if it is from a changegroup |
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122 while self.bundle(rev): |
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123 if self.cache and self.cache[0] == iter_node: |
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124 text = self.cache[2] |
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125 break |
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126 chain.append(rev) |
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127 iter_node = self.bundlebase(rev) |
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128 rev = self.rev(iter_node) |
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129 if text is None: |
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130 text = revlog.revlog.revision(self, iter_node) |
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131 |
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132 while chain: |
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133 delta = self.chunk(chain.pop()) |
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134 text = self.patches(text, [delta]) |
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135 |
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136 p1, p2 = self.parents(node) |
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137 if node != revlog.hash(text, p1, p2): |
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138 raise RevlogError(_("integrity check failed on %s:%d") |
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139 % (self.datafile, self.rev(node))) |
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140 |
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141 self.cache = (node, rev, text) |
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142 return text |
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143 |
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144 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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145 raise NotImplementedError |
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146 def addgroup(self, revs, linkmapper, transaction, unique=0): |
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147 raise NotImplementedError |
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148 def strip(self, rev, minlink): |
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149 raise NotImplementedError |
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150 def checksize(self): |
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151 raise NotImplementedError |
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152 |
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153 class bundlechangelog(bundlerevlog, changelog.changelog): |
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154 def __init__(self, opener, bundlefile): |
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155 changelog.changelog.__init__(self, opener) |
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156 bundlerevlog.__init__(self, opener, "00changelog.i", "00changelog.d", |
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157 bundlefile) |
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158 |
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159 class bundlemanifest(bundlerevlog, manifest.manifest): |
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160 def __init__(self, opener, bundlefile, linkmapper): |
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161 manifest.manifest.__init__(self, opener) |
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162 bundlerevlog.__init__(self, opener, self.indexfile, self.datafile, |
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163 bundlefile, linkmapper) |
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164 |
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165 class bundlefilelog(bundlerevlog, filelog.filelog): |
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166 def __init__(self, opener, path, bundlefile, linkmapper): |
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167 filelog.filelog.__init__(self, opener, path) |
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168 bundlerevlog.__init__(self, opener, self.indexfile, self.datafile, |
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169 bundlefile, linkmapper) |
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170 |
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171 class bundlerepository(localrepo.localrepository): |
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172 def __init__(self, ui, path, bundlename): |
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173 localrepo.localrepository.__init__(self, ui, path) |
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174 f = open(bundlename, "rb") |
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175 s = os.fstat(f.fileno()) |
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176 self.bundlefile = f |
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177 header = self.bundlefile.read(4) |
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178 if header == "HG10": |
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179 raise util.Abort(_("%s: compressed bundle not supported") |
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180 % bundlename) |
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181 elif header != "HG11": |
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182 raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename) |
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183 self.changelog = bundlechangelog(self.opener, self.bundlefile) |
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184 self.manifest = bundlemanifest(self.opener, self.bundlefile, |
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185 self.changelog.rev) |
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186 # dict with the mapping 'filename' -> position in the bundle |
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187 self.bundlefilespos = {} |
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188 while 1: |
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189 f = getchunk(self.bundlefile) |
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190 if not f: |
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191 break |
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192 self.bundlefilespos[f] = self.bundlefile.tell() |
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193 while getchunk(self.bundlefile): |
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194 pass |
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195 |
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196 def dev(self): |
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197 return -1 |
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198 |
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199 def file(self, f): |
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200 if f[0] == '/': |
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201 f = f[1:] |
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202 if f in self.bundlefilespos: |
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203 self.bundlefile.seek(self.bundlefilespos[f]) |
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff
changeset
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204 return bundlefilelog(self.opener, f, self.bundlefile, |
9da45de3118d
add bundlerepo.py: a read-only repo that can use uncompressed bundles
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff
changeset
|
205 self.changelog.rev) |
9da45de3118d
add bundlerepo.py: a read-only repo that can use uncompressed bundles
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff
changeset
|
206 else: |
1946
9fee186f7f0d
bundlerepo: remove relative import, fix a comment
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1942
diff
changeset
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207 return filelog.filelog(self.opener, f) |
1942
9da45de3118d
add bundlerepo.py: a read-only repo that can use uncompressed bundles
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
diff
changeset
|
208 |
1971
915b81a35e46
imported patch /home/thomas/fix-incoming-abortion4.patch
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1946
diff
changeset
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209 def close(self): |
915b81a35e46
imported patch /home/thomas/fix-incoming-abortion4.patch
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1946
diff
changeset
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210 """Close assigned bundle file immediately.""" |
915b81a35e46
imported patch /home/thomas/fix-incoming-abortion4.patch
Thomas Arendsen Hein <thomas@intevation.de>
parents:
1946
diff
changeset
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211 self.bundlefile.close() |