Mercurial > hg
annotate mercurial/bundlerepo.py @ 12709:4147a292c508
filectx: use ctx.size comparisons to speed up ctx.cmp
Comparing sizes is cheaper than comparing file contents, as it does not
involve reading the file on disk or from the filelog.
It is however not always possible: some extensions, or encode filters,
change data when extracting it to the working directory.
author | Nicolas Dumazet <nicdumz.commits@gmail.com> |
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date | Tue, 27 Jul 2010 23:07:30 +0900 |
parents | 6277a9469dff |
children | 5dfd1c49dcc5 |
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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, 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, bundle, |
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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 bundle (an unbundle object). |
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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.bundle = bundle |
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34 self.basemap = {} |
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35 def chunkpositer(): |
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36 while 1: |
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37 chunk = bundle.chunk() |
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38 if not chunk: |
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39 break |
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40 pos = bundle.tell() |
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41 yield chunk, pos - len(chunk) |
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42 n = len(self) |
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43 prev = None |
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44 for chunk, start in chunkpositer(): |
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45 size = len(chunk) |
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46 if size < 80: |
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47 raise util.Abort(_("invalid changegroup")) |
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48 start += 80 |
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49 size -= 80 |
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50 node, p1, p2, cs = struct.unpack("20s20s20s20s", chunk[:80]) |
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51 if node in self.nodemap: |
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52 prev = node |
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53 continue |
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54 for p in (p1, p2): |
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55 if not p in self.nodemap: |
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56 raise error.LookupError(p, self.indexfile, |
7633 | 57 _("unknown parent")) |
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58 if linkmapper is None: |
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59 link = n |
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60 else: |
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61 link = linkmapper(cs) |
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62 |
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63 if not prev: |
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64 prev = p1 |
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65 # start, size, full unc. size, base (unused), link, p1, p2, node |
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66 e = (revlog.offset_type(start, 0), size, -1, -1, link, |
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67 self.rev(p1), self.rev(p2), node) |
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68 self.basemap[n] = prev |
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69 self.index.insert(-1, e) |
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70 self.nodemap[node] = n |
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71 prev = node |
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72 n += 1 |
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73 |
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74 def inbundle(self, rev): |
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75 """is rev from the bundle""" |
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76 if rev < 0: |
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77 return False |
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78 return rev in self.basemap |
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79 def bundlebase(self, rev): |
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80 return self.basemap[rev] |
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81 def _chunk(self, rev): |
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82 # Warning: in case of bundle, the diff is against bundlebase, |
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83 # not against rev - 1 |
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84 # XXX: could use some caching |
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85 if not self.inbundle(rev): |
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86 return revlog.revlog._chunk(self, rev) |
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87 self.bundle.seek(self.start(rev)) |
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88 return self.bundle.read(self.length(rev)) |
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89 |
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90 def revdiff(self, rev1, rev2): |
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91 """return or calculate a delta between two revisions""" |
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92 if self.inbundle(rev1) and self.inbundle(rev2): |
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93 # hot path for bundle |
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94 revb = self.rev(self.bundlebase(rev2)) |
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95 if revb == rev1: |
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96 return self._chunk(rev2) |
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97 elif not self.inbundle(rev1) and not self.inbundle(rev2): |
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98 return revlog.revlog.revdiff(self, rev1, rev2) |
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99 |
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100 return mdiff.textdiff(self.revision(self.node(rev1)), |
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101 self.revision(self.node(rev2))) |
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102 |
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103 def revision(self, node): |
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104 """return an uncompressed revision of a given""" |
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105 if node == nullid: |
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106 return "" |
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107 |
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108 text = None |
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109 chain = [] |
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110 iter_node = node |
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111 rev = self.rev(iter_node) |
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112 # reconstruct the revision if it is from a changegroup |
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113 while self.inbundle(rev): |
4984 | 114 if self._cache and self._cache[0] == iter_node: |
115 text = self._cache[2] | |
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116 break |
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117 chain.append(rev) |
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118 iter_node = self.bundlebase(rev) |
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119 rev = self.rev(iter_node) |
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120 if text is None: |
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121 text = revlog.revlog.revision(self, iter_node) |
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122 |
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123 while chain: |
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124 delta = self._chunk(chain.pop()) |
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125 text = mdiff.patches(text, [delta]) |
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126 |
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127 p1, p2 = self.parents(node) |
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128 if node != revlog.hash(text, p1, p2): |
7633 | 129 raise error.RevlogError(_("integrity check failed on %s:%d") |
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130 % (self.datafile, self.rev(node))) |
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131 |
4984 | 132 self._cache = (node, self.rev(node), text) |
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133 return text |
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134 |
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135 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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136 raise NotImplementedError |
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137 def addgroup(self, revs, linkmapper, transaction): |
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138 raise NotImplementedError |
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139 def strip(self, rev, minlink): |
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140 raise NotImplementedError |
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141 def checksize(self): |
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142 raise NotImplementedError |
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143 |
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144 class bundlechangelog(bundlerevlog, changelog.changelog): |
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145 def __init__(self, opener, bundle): |
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146 changelog.changelog.__init__(self, opener) |
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147 bundlerevlog.__init__(self, opener, self.indexfile, bundle) |
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148 |
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149 class bundlemanifest(bundlerevlog, manifest.manifest): |
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150 def __init__(self, opener, bundle, linkmapper): |
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151 manifest.manifest.__init__(self, opener) |
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152 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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153 linkmapper) |
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154 |
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155 class bundlefilelog(bundlerevlog, filelog.filelog): |
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156 def __init__(self, opener, path, bundle, linkmapper): |
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157 filelog.filelog.__init__(self, opener, path) |
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158 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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159 linkmapper) |
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160 |
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161 class bundlerepository(localrepo.localrepository): |
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162 def __init__(self, ui, path, bundlename): |
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163 self._tempparent = None |
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164 try: |
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165 localrepo.localrepository.__init__(self, ui, path) |
7637 | 166 except error.RepoError: |
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167 self._tempparent = tempfile.mkdtemp() |
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168 localrepo.instance(ui, self._tempparent, 1) |
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169 localrepo.localrepository.__init__(self, ui, self._tempparent) |
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170 |
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171 if path: |
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172 self._url = 'bundle:' + util.expandpath(path) + '+' + bundlename |
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173 else: |
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174 self._url = 'bundle:' + bundlename |
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175 |
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176 self.tempfile = None |
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177 f = open(bundlename, "rb") |
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178 self.bundle = changegroup.readbundle(f, bundlename) |
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179 if self.bundle.compressed(): |
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180 fdtemp, temp = tempfile.mkstemp(prefix="hg-bundle-", |
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181 suffix=".hg10un", dir=self.path) |
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182 self.tempfile = temp |
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183 fptemp = os.fdopen(fdtemp, 'wb') |
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184 |
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185 try: |
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186 fptemp.write("HG10UN") |
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187 while 1: |
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188 chunk = self.bundle.read(2**18) |
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189 if not chunk: |
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190 break |
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191 fptemp.write(chunk) |
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192 finally: |
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193 fptemp.close() |
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194 |
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195 f = open(self.tempfile, "rb") |
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196 self.bundle = changegroup.readbundle(f, bundlename) |
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197 |
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198 # dict with the mapping 'filename' -> position in the bundle |
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199 self.bundlefilespos = {} |
5262 | 200 |
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201 @util.propertycache |
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202 def changelog(self): |
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203 c = bundlechangelog(self.sopener, self.bundle) |
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204 self.manstart = self.bundle.tell() |
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205 return c |
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206 |
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207 @util.propertycache |
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208 def manifest(self): |
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209 self.bundle.seek(self.manstart) |
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210 m = bundlemanifest(self.sopener, self.bundle, self.changelog.rev) |
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211 self.filestart = self.bundle.tell() |
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212 return m |
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213 |
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214 @util.propertycache |
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215 def manstart(self): |
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216 self.changelog |
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217 return self.manstart |
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218 |
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219 @util.propertycache |
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220 def filestart(self): |
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221 self.manifest |
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222 return self.filestart |
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223 |
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224 def url(self): |
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225 return self._url |
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226 |
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227 def file(self, f): |
5262 | 228 if not self.bundlefilespos: |
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229 self.bundle.seek(self.filestart) |
5262 | 230 while 1: |
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231 chunk = self.bundle.chunk() |
5262 | 232 if not chunk: |
233 break | |
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234 self.bundlefilespos[chunk] = self.bundle.tell() |
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235 while 1: |
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236 c = self.bundle.chunk() |
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237 if not c: |
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238 break |
5262 | 239 |
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240 if f[0] == '/': |
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241 f = f[1:] |
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242 if f in self.bundlefilespos: |
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243 self.bundle.seek(self.bundlefilespos[f]) |
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244 return bundlefilelog(self.sopener, f, self.bundle, |
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245 self.changelog.rev) |
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246 else: |
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247 return filelog.filelog(self.sopener, f) |
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248 |
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249 def close(self): |
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250 """Close assigned bundle file immediately.""" |
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251 self.bundle.close() |
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252 |
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253 def __del__(self): |
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254 del self.bundle |
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255 if tempfile is not None: |
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256 os.unlink(tempfile) |
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257 if self._tempparent: |
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258 shutil.rmtree(self._tempparent, True) |
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259 |
6315 | 260 def cancopy(self): |
261 return False | |
262 | |
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263 def getcwd(self): |
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264 return os.getcwd() # always outside the repo |
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265 |
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266 def instance(ui, path, create): |
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267 if create: |
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268 raise util.Abort(_('cannot create new bundle repository')) |
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269 parentpath = ui.config("bundle", "mainreporoot", "") |
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270 if parentpath: |
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271 # Try to make the full path relative so we get a nice, short URL. |
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272 # In particular, we don't want temp dir names in test outputs. |
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273 cwd = os.getcwd() |
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274 if parentpath == cwd: |
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275 parentpath = '' |
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276 else: |
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277 cwd = os.path.join(cwd,'') |
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278 if parentpath.startswith(cwd): |
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279 parentpath = parentpath[len(cwd):] |
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280 path = util.drop_scheme('file', path) |
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281 if path.startswith('bundle:'): |
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282 path = util.drop_scheme('bundle', path) |
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283 s = path.split("+", 1) |
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284 if len(s) == 1: |
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285 repopath, bundlename = parentpath, s[0] |
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286 else: |
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287 repopath, bundlename = s |
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288 else: |
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289 repopath, bundlename = parentpath, path |
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290 return bundlerepository(ui, repopath, bundlename) |