Mercurial > hg
annotate mercurial/bundlerepo.py @ 2439:e8c4f3d3df8c
extend network protocol to stop clients from locking servers
now all repositories have capabilities slot, tuple with list of names.
if 'unbundle' capability present, repo supports push where client does
not need to lock server. repository classes that have unbundle capability
also have unbundle method.
implemented for ssh now, will be base for push over http.
unbundle protocol acts this way. server tells client what heads it
has during normal negotiate step. client starts unbundle by repeat
server's heads back to it. if server has new heads, abort immediately.
otherwise, transfer changes to server. once data transferred, server
locks and checks heads again. if heads same, changes can be added.
else someone else added heads, and server aborts.
if client wants to force server to add heads, sends special heads list of
'force'.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Thu, 15 Jun 2006 16:37:23 -0700 |
parents | f116ddea537f |
children | 109a22f5434a |
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(), "changegroup util os struct bz2 tempfile") |
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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 class bundlerevlog(revlog.revlog): |
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21 def __init__(self, opener, indexfile, datafile, 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, datafile) |
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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 = self.count() |
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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 revlog.RevlogError(_("unknown parent %s") % short(p1)) |
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54 if linkmapper is None: |
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55 link = n |
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56 else: |
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57 link = linkmapper(cs) |
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58 |
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59 if not prev: |
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60 prev = p1 |
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61 # start, size, base is not used, link, p1, p2, delta ref |
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62 if self.version == 0: |
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63 e = (start, size, None, link, p1, p2, node) |
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64 else: |
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65 e = (self.offset_type(start, 0), size, -1, None, link, |
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66 self.rev(p1), self.rev(p2), node) |
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67 self.basemap[n] = prev |
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68 self.index.append(e) |
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69 self.nodemap[node] = n |
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70 prev = node |
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71 n += 1 |
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72 |
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73 def bundle(self, rev): |
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74 """is rev from the bundle""" |
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75 if rev < 0: |
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76 return False |
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77 return rev in self.basemap |
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78 def bundlebase(self, rev): return self.basemap[rev] |
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79 def chunk(self, rev, df=None, cachelen=4096): |
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80 # Warning: in case of bundle, the diff is against bundlebase, |
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81 # not against rev - 1 |
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82 # XXX: could use some caching |
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83 if not self.bundle(rev): |
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84 return revlog.revlog.chunk(self, rev, df, cachelen) |
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85 self.bundlefile.seek(self.start(rev)) |
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86 return self.bundlefile.read(self.length(rev)) |
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87 |
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88 def revdiff(self, rev1, rev2): |
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89 """return or calculate a delta between two revisions""" |
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90 if self.bundle(rev1) and self.bundle(rev2): |
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91 # hot path for bundle |
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92 revb = self.rev(self.bundlebase(rev2)) |
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93 if revb == rev1: |
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94 return self.chunk(rev2) |
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95 elif not self.bundle(rev1) and not self.bundle(rev2): |
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96 return revlog.revlog.chunk(self, rev1, rev2) |
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97 |
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98 return self.diff(self.revision(self.node(rev1)), |
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99 self.revision(self.node(rev2))) |
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100 |
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101 def revision(self, node): |
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102 """return an uncompressed revision of a given""" |
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103 if node == nullid: 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): |
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111 if self.cache and self.cache[0] == iter_node: |
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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 = self.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): |
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126 raise revlog.RevlogError(_("integrity check failed on %s:%d") |
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127 % (self.datafile, self.rev(node))) |
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128 |
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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, unique=0): |
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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, "00changelog.i", "00changelog.d", |
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145 bundlefile) |
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146 |
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147 class bundlemanifest(bundlerevlog, manifest.manifest): |
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148 def __init__(self, opener, bundlefile, linkmapper): |
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149 manifest.manifest.__init__(self, opener) |
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150 bundlerevlog.__init__(self, opener, self.indexfile, self.datafile, |
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151 bundlefile, linkmapper) |
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152 |
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153 class bundlefilelog(bundlerevlog, filelog.filelog): |
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154 def __init__(self, opener, path, bundlefile, linkmapper): |
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155 filelog.filelog.__init__(self, opener, path) |
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156 bundlerevlog.__init__(self, opener, self.indexfile, self.datafile, |
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157 bundlefile, linkmapper) |
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158 |
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159 class bundlerepository(localrepo.localrepository): |
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160 def __init__(self, ui, path, bundlename): |
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161 localrepo.localrepository.__init__(self, ui, path) |
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162 self.tempfile = None |
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163 self.bundlefile = open(bundlename, "rb") |
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164 header = self.bundlefile.read(6) |
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165 if not header.startswith("HG"): |
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166 raise util.Abort(_("%s: not a Mercurial bundle file") % bundlename) |
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167 elif not header.startswith("HG10"): |
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168 raise util.Abort(_("%s: unknown bundle version") % bundlename) |
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169 elif header == "HG10BZ": |
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170 fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-", |
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171 suffix=".hg10un", dir=self.path) |
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172 self.tempfile = temp |
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173 fptemp = os.fdopen(fdtemp, 'wb') |
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174 def generator(f): |
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175 zd = bz2.BZ2Decompressor() |
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176 zd.decompress("BZ") |
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177 for chunk in f: |
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178 yield zd.decompress(chunk) |
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179 gen = generator(util.filechunkiter(self.bundlefile, 4096)) |
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180 |
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181 try: |
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182 fptemp.write("HG10UN") |
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183 for chunk in gen: |
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184 fptemp.write(chunk) |
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185 finally: |
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186 fptemp.close() |
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187 self.bundlefile.close() |
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188 |
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189 self.bundlefile = open(self.tempfile, "rb") |
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190 # seek right after the header |
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191 self.bundlefile.seek(6) |
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192 elif header == "HG10UN": |
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193 # nothing to do |
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194 pass |
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195 else: |
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196 raise util.Abort(_("%s: unknown bundle compression type") |
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197 % bundlename) |
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198 self.changelog = bundlechangelog(self.opener, self.bundlefile) |
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199 self.manifest = bundlemanifest(self.opener, self.bundlefile, |
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200 self.changelog.rev) |
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201 # dict with the mapping 'filename' -> position in the bundle |
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202 self.bundlefilespos = {} |
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203 while 1: |
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204 f = changegroup.getchunk(self.bundlefile) |
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205 if not f: |
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206 break |
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207 self.bundlefilespos[f] = self.bundlefile.tell() |
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208 for c in changegroup.chunkiter(self.bundlefile): |
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209 pass |
1942
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210 |
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211 def dev(self): |
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212 return -1 |
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213 |
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214 def file(self, f): |
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215 if f[0] == '/': |
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216 f = f[1:] |
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217 if f in self.bundlefilespos: |
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218 self.bundlefile.seek(self.bundlefilespos[f]) |
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219 return bundlefilelog(self.opener, f, self.bundlefile, |
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220 self.changelog.rev) |
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221 else: |
1946
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222 return filelog.filelog(self.opener, f) |
1942
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223 |
1971
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224 def close(self): |
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225 """Close assigned bundle file immediately.""" |
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226 self.bundlefile.close() |
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227 |
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228 def __del__(self): |
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229 if not self.bundlefile.closed: |
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230 self.bundlefile.close() |
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231 if self.tempfile is not None: |
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232 os.unlink(self.tempfile) |