Mercurial > hg
annotate mercurial/bundlerepo.py @ 25018:93e015a3d1ea
commit: add ui.allowemptycommit config option
This adds a config flag that enables a user to make empty commits.
This is useful in a number of cases.
For instance, automation that creates release branches via
bookmarks may want to make empty commits to that release bookmark so that it
can't be fast-forwarded and so it can record information about the release
bookmark's creation. This is already possible with named branches, so making it
possible for bookmarks makes sense.
Another case we've wanted it is for mirroring repositories into Mercurial. We
have automation that syncs commits into hg by running things from the command
line. The ability to produce empty commits is useful for syncing unusual commits
from other VCS's.
In general, allowing the user to create the DAG as they see fit seems useful,
and when I mentioned this in IRC more than one person piped up and said they
were already hacking around this limitation by using mq, import, and
commit-dummy-change-then-amend-the-content-away style solutions.
author | Durham Goode <durham@fb.com> |
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date | Mon, 11 May 2015 16:18:28 -0700 |
parents | 86c0b5c09ee6 |
children | 5418dd5be8ac |
rev | line source |
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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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14158 | 16 import os, tempfile, shutil |
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17 import changegroup, util, mdiff, discovery, cmdutil, scmutil, exchange |
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18 import localrepo, changelog, manifest, filelog, revlog, error, phases, bundle2 |
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19 import pathutil |
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20 |
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21 class bundlerevlog(revlog.revlog): |
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22 def __init__(self, opener, indexfile, bundle, linkmapper): |
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23 # How it works: |
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24 # To retrieve a revision, we need to know the offset of the revision in |
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25 # the bundle (an unbundle object). We store this offset in the index |
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26 # (start). The base of the delta is stored in the base field. |
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27 # |
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28 # To differentiate a rev in the bundle from a rev in the revlog, we |
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29 # check revision against repotiprev. |
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30 opener = scmutil.readonlyvfs(opener) |
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31 revlog.revlog.__init__(self, opener, indexfile) |
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32 self.bundle = bundle |
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33 n = len(self) |
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34 self.repotiprev = n - 1 |
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35 chain = None |
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36 self.bundlerevs = set() # used by 'bundle()' revset expression |
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37 while True: |
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38 chunkdata = bundle.deltachunk(chain) |
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39 if not chunkdata: |
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40 break |
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41 node = chunkdata['node'] |
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42 p1 = chunkdata['p1'] |
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43 p2 = chunkdata['p2'] |
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44 cs = chunkdata['cs'] |
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45 deltabase = chunkdata['deltabase'] |
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46 delta = chunkdata['delta'] |
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47 |
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48 size = len(delta) |
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49 start = bundle.tell() - size |
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50 |
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51 link = linkmapper(cs) |
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52 if node in self.nodemap: |
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53 # this can happen if two branches make the same change |
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54 chain = node |
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55 self.bundlerevs.add(self.nodemap[node]) |
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56 continue |
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57 |
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58 for p in (p1, p2): |
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59 if p not in self.nodemap: |
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60 raise error.LookupError(p, self.indexfile, |
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62 |
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63 if deltabase not in self.nodemap: |
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64 raise LookupError(deltabase, self.indexfile, |
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65 _('unknown delta base')) |
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66 |
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67 baserev = self.rev(deltabase) |
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68 # start, size, full unc. size, base (unused), link, p1, p2, node |
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69 e = (revlog.offset_type(start, 0), size, -1, baserev, link, |
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70 self.rev(p1), self.rev(p2), node) |
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71 self.index.insert(-1, e) |
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72 self.nodemap[node] = n |
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73 self.bundlerevs.add(n) |
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74 chain = node |
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75 n += 1 |
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76 |
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77 def _chunk(self, rev): |
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78 # Warning: in case of bundle, the diff is against what we stored as |
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79 # delta base, not against rev - 1 |
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80 # XXX: could use some caching |
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81 if rev <= self.repotiprev: |
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82 return revlog.revlog._chunk(self, rev) |
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83 self.bundle.seek(self.start(rev)) |
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84 return self.bundle.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 rev1 > self.repotiprev and rev2 > self.repotiprev: |
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89 # hot path for bundle |
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90 revb = self.index[rev2][3] |
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91 if revb == rev1: |
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92 return self._chunk(rev2) |
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93 elif rev1 <= self.repotiprev and rev2 <= self.repotiprev: |
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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, nodeorrev): |
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100 """return an uncompressed revision of a given node or revision |
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101 number. |
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102 """ |
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103 if isinstance(nodeorrev, int): |
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104 rev = nodeorrev |
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105 node = self.node(rev) |
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106 else: |
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107 node = nodeorrev |
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108 rev = self.rev(node) |
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109 |
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110 if node == nullid: |
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111 return "" |
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112 |
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113 text = None |
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114 chain = [] |
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115 iterrev = rev |
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116 # reconstruct the revision if it is from a changegroup |
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117 while iterrev > self.repotiprev: |
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118 if self._cache and self._cache[1] == iterrev: |
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120 break |
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121 chain.append(iterrev) |
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122 iterrev = self.index[iterrev][3] |
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123 if text is None: |
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124 text = self.baserevision(iterrev) |
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125 |
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126 while chain: |
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127 delta = self._chunk(chain.pop()) |
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128 text = mdiff.patches(text, [delta]) |
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129 |
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130 self._checkhash(text, node, rev) |
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131 self._cache = (node, rev, text) |
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132 return text |
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133 |
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134 def baserevision(self, nodeorrev): |
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135 # Revlog subclasses may override 'revision' method to modify format of |
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136 # content retrieved from revlog. To use bundlerevlog with such class one |
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137 # needs to override 'baserevision' and make more specific call here. |
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138 return revlog.revlog.revision(self, nodeorrev) |
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139 |
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140 def addrevision(self, text, transaction, link, p1=None, p2=None, d=None): |
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141 raise NotImplementedError |
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142 def addgroup(self, revs, linkmapper, transaction): |
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143 raise NotImplementedError |
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144 def strip(self, rev, minlink): |
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145 raise NotImplementedError |
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146 def checksize(self): |
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147 raise NotImplementedError |
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148 |
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149 class bundlechangelog(bundlerevlog, changelog.changelog): |
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150 def __init__(self, opener, bundle): |
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151 changelog.changelog.__init__(self, opener) |
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152 linkmapper = lambda x: x |
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153 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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154 linkmapper) |
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155 |
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156 def baserevision(self, nodeorrev): |
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157 # Although changelog doesn't override 'revision' method, some extensions |
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158 # may replace this class with another that does. Same story with |
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159 # manifest and filelog classes. |
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160 |
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161 # This bypasses filtering on changelog.node() and rev() because we need |
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162 # revision text of the bundle base even if it is hidden. |
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163 oldfilter = self.filteredrevs |
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164 try: |
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165 self.filteredrevs = () |
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166 return changelog.changelog.revision(self, nodeorrev) |
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167 finally: |
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168 self.filteredrevs = oldfilter |
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169 |
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170 class bundlemanifest(bundlerevlog, manifest.manifest): |
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171 def __init__(self, opener, bundle, linkmapper): |
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172 manifest.manifest.__init__(self, opener) |
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173 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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174 linkmapper) |
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175 |
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176 def baserevision(self, nodeorrev): |
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177 return manifest.manifest.revision(self, nodeorrev) |
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178 |
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179 class bundlefilelog(bundlerevlog, filelog.filelog): |
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180 def __init__(self, opener, path, bundle, linkmapper): |
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181 filelog.filelog.__init__(self, opener, path) |
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182 bundlerevlog.__init__(self, opener, self.indexfile, bundle, |
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183 linkmapper) |
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184 |
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185 def baserevision(self, nodeorrev): |
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186 return filelog.filelog.revision(self, nodeorrev) |
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187 |
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188 class bundlepeer(localrepo.localpeer): |
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189 def canpush(self): |
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190 return False |
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191 |
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192 class bundlephasecache(phases.phasecache): |
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193 def __init__(self, *args, **kwargs): |
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194 super(bundlephasecache, self).__init__(*args, **kwargs) |
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195 if util.safehasattr(self, 'opener'): |
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196 self.opener = scmutil.readonlyvfs(self.opener) |
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197 |
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198 def write(self): |
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199 raise NotImplementedError |
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200 |
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201 def _write(self, fp): |
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202 raise NotImplementedError |
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203 |
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204 def _updateroots(self, phase, newroots, tr): |
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205 self.phaseroots[phase] = newroots |
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206 self.invalidate() |
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207 self.dirty = True |
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208 |
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209 class bundlerepository(localrepo.localrepository): |
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210 def __init__(self, ui, path, bundlename): |
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211 self._tempparent = None |
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212 try: |
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213 localrepo.localrepository.__init__(self, ui, path) |
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215 self._tempparent = tempfile.mkdtemp() |
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216 localrepo.instance(ui, self._tempparent, 1) |
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217 localrepo.localrepository.__init__(self, ui, self._tempparent) |
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218 self.ui.setconfig('phases', 'publish', False, 'bundlerepo') |
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219 |
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220 if path: |
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221 self._url = 'bundle:' + util.expandpath(path) + '+' + bundlename |
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222 else: |
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223 self._url = 'bundle:' + bundlename |
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224 |
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225 self.tempfile = None |
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226 f = util.posixfile(bundlename, "rb") |
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227 self.bundlefile = self.bundle = exchange.readbundle(ui, f, bundlename) |
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228 if self.bundle.compressed(): |
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229 fdtemp, temp = self.vfs.mkstemp(prefix="hg-bundle-", |
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230 suffix=".hg10un") |
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231 self.tempfile = temp |
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232 fptemp = os.fdopen(fdtemp, 'wb') |
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233 |
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234 try: |
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235 fptemp.write("HG10UN") |
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236 while True: |
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237 chunk = self.bundle.read(2**18) |
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238 if not chunk: |
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239 break |
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240 fptemp.write(chunk) |
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241 finally: |
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242 fptemp.close() |
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243 |
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244 f = self.vfs.open(self.tempfile, mode="rb") |
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245 self.bundlefile = self.bundle = exchange.readbundle(ui, f, |
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246 bundlename, |
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247 self.vfs) |
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248 |
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249 if isinstance(self.bundle, bundle2.unbundle20): |
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250 cgparts = [part for part in self.bundle.iterparts() |
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251 if (part.type == 'changegroup') |
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252 and (part.params.get('version', '01') |
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253 in changegroup.packermap)] |
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254 |
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255 if not cgparts: |
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256 raise util.Abort('No changegroups found') |
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257 version = cgparts[0].params.get('version', '01') |
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258 cgparts = [p for p in cgparts |
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259 if p.params.get('version', '01') == version] |
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260 if len(cgparts) > 1: |
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261 raise NotImplementedError("Can't process multiple changegroups") |
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262 part = cgparts[0] |
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263 |
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264 part.seek(0) |
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265 self.bundle = changegroup.packermap[version][1](part, 'UN') |
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266 |
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267 # dict with the mapping 'filename' -> position in the bundle |
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268 self.bundlefilespos = {} |
5262 | 269 |
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270 self.firstnewrev = self.changelog.repotiprev + 1 |
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271 phases.retractboundary(self, None, phases.draft, |
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272 [ctx.node() for ctx in self[self.firstnewrev:]]) |
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273 |
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274 @localrepo.unfilteredpropertycache |
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275 def _phasecache(self): |
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276 return bundlephasecache(self, self._phasedefaults) |
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277 |
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278 @localrepo.unfilteredpropertycache |
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279 def changelog(self): |
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280 # consume the header if it exists |
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281 self.bundle.changelogheader() |
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282 c = bundlechangelog(self.svfs, self.bundle) |
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283 self.manstart = self.bundle.tell() |
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284 return c |
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285 |
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286 @localrepo.unfilteredpropertycache |
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287 def manifest(self): |
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288 self.bundle.seek(self.manstart) |
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289 # consume the header if it exists |
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290 self.bundle.manifestheader() |
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291 m = bundlemanifest(self.svfs, self.bundle, self.changelog.rev) |
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292 self.filestart = self.bundle.tell() |
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293 return m |
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294 |
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295 @localrepo.unfilteredpropertycache |
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296 def manstart(self): |
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297 self.changelog |
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298 return self.manstart |
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299 |
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300 @localrepo.unfilteredpropertycache |
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301 def filestart(self): |
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302 self.manifest |
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303 return self.filestart |
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304 |
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305 def url(self): |
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306 return self._url |
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307 |
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308 def file(self, f): |
5262 | 309 if not self.bundlefilespos: |
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310 self.bundle.seek(self.filestart) |
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311 while True: |
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312 chunkdata = self.bundle.filelogheader() |
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313 if not chunkdata: |
5262 | 314 break |
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315 fname = chunkdata['filename'] |
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316 self.bundlefilespos[fname] = self.bundle.tell() |
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317 while True: |
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318 c = self.bundle.deltachunk(None) |
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319 if not c: |
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320 break |
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322 if f in self.bundlefilespos: |
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323 self.bundle.seek(self.bundlefilespos[f]) |
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324 return bundlefilelog(self.svfs, f, self.bundle, self.changelog.rev) |
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325 else: |
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326 return filelog.filelog(self.svfs, f) |
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327 |
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328 def close(self): |
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329 """Close assigned bundle file immediately.""" |
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330 self.bundlefile.close() |
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331 if self.tempfile is not None: |
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332 self.vfs.unlink(self.tempfile) |
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333 if self._tempparent: |
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334 shutil.rmtree(self._tempparent, True) |
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335 |
6315 | 336 def cancopy(self): |
337 return False | |
338 | |
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339 def peer(self): |
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340 return bundlepeer(self) |
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341 |
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342 def getcwd(self): |
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343 return os.getcwd() # always outside the repo |
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344 |
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345 |
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346 def instance(ui, path, create): |
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347 if create: |
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348 raise util.Abort(_('cannot create new bundle repository')) |
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349 parentpath = ui.config("bundle", "mainreporoot", "") |
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350 if not parentpath: |
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351 # try to find the correct path to the working directory repo |
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352 parentpath = cmdutil.findrepo(os.getcwd()) |
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353 if parentpath is None: |
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354 parentpath = '' |
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355 if parentpath: |
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356 # Try to make the full path relative so we get a nice, short URL. |
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357 # In particular, we don't want temp dir names in test outputs. |
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358 cwd = os.getcwd() |
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359 if parentpath == cwd: |
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360 parentpath = '' |
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361 else: |
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362 cwd = pathutil.normasprefix(cwd) |
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363 if parentpath.startswith(cwd): |
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364 parentpath = parentpath[len(cwd):] |
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365 u = util.url(path) |
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366 path = u.localpath() |
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367 if u.scheme == 'bundle': |
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368 s = path.split("+", 1) |
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369 if len(s) == 1: |
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370 repopath, bundlename = parentpath, s[0] |
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371 else: |
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372 repopath, bundlename = s |
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373 else: |
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374 repopath, bundlename = parentpath, path |
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375 return bundlerepository(ui, repopath, bundlename) |
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376 |
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377 class bundletransactionmanager(object): |
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378 def transaction(self): |
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379 return None |
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380 |
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381 def close(self): |
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382 raise NotImplementedError |
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383 |
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384 def release(self): |
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385 raise NotImplementedError |
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386 |
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387 def getremotechanges(ui, repo, other, onlyheads=None, bundlename=None, |
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388 force=False): |
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389 '''obtains a bundle of changes incoming from other |
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390 |
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391 "onlyheads" restricts the returned changes to those reachable from the |
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392 specified heads. |
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393 "bundlename", if given, stores the bundle to this file path permanently; |
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394 otherwise it's stored to a temp file and gets deleted again when you call |
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395 the returned "cleanupfn". |
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396 "force" indicates whether to proceed on unrelated repos. |
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397 |
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398 Returns a tuple (local, csets, cleanupfn): |
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399 |
16683 | 400 "local" is a local repo from which to obtain the actual incoming |
401 changesets; it is a bundlerepo for the obtained bundle when the | |
402 original "other" is remote. | |
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403 "csets" lists the incoming changeset node ids. |
16683 | 404 "cleanupfn" must be called without arguments when you're done processing |
405 the changes; it closes both the original "other" and the one returned | |
406 here. | |
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407 ''' |
16683 | 408 tmp = discovery.findcommonincoming(repo, other, heads=onlyheads, |
409 force=force) | |
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410 common, incoming, rheads = tmp |
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411 if not incoming: |
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412 try: |
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413 if bundlename: |
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414 os.unlink(bundlename) |
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415 except OSError: |
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416 pass |
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417 return repo, [], other.close |
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418 |
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419 commonset = set(common) |
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420 rheads = [x for x in rheads if x not in commonset] |
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421 |
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422 bundle = None |
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423 bundlerepo = None |
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424 localrepo = other.local() |
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425 if bundlename or not localrepo: |
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426 # create a bundle (uncompressed if other repo is not local) |
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427 |
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428 if other.capable('getbundle'): |
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429 cg = other.getbundle('incoming', common=common, heads=rheads) |
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430 elif onlyheads is None and not other.capable('changegroupsubset'): |
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431 # compat with older servers when pulling all remote heads |
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432 cg = other.changegroup(incoming, "incoming") |
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433 rheads = None |
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434 else: |
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435 cg = other.changegroupsubset(incoming, rheads, 'incoming') |
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436 if localrepo: |
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437 bundletype = "HG10BZ" |
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438 else: |
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439 bundletype = "HG10UN" |
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440 fname = bundle = changegroup.writebundle(ui, cg, bundlename, bundletype) |
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441 # keep written bundle? |
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442 if bundlename: |
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443 bundle = None |
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444 if not localrepo: |
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445 # use the created uncompressed bundlerepo |
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446 localrepo = bundlerepo = bundlerepository(repo.baseui, repo.root, |
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447 fname) |
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448 # this repo contains local and other now, so filter out local again |
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449 common = repo.heads() |
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450 if localrepo: |
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451 # Part of common may be remotely filtered |
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452 # So use an unfiltered version |
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453 # The discovery process probably need cleanup to avoid that |
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454 localrepo = localrepo.unfiltered() |
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455 |
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456 csets = localrepo.changelog.findmissing(common, rheads) |
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457 |
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458 if bundlerepo: |
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459 reponodes = [ctx.node() for ctx in bundlerepo[bundlerepo.firstnewrev:]] |
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460 remotephases = other.listkeys('phases') |
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461 |
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462 pullop = exchange.pulloperation(bundlerepo, other, heads=reponodes) |
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463 pullop.trmanager = bundletransactionmanager() |
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464 exchange._pullapplyphases(pullop, remotephases) |
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465 |
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466 def cleanup(): |
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467 if bundlerepo: |
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468 bundlerepo.close() |
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469 if bundle: |
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470 os.unlink(bundle) |
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471 other.close() |
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472 |
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473 return (localrepo, csets, cleanup) |