Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/repair.py @ 11791:00cde9bddbe4

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repair: do not compress partial bundle if we do not keep it on disk A partial bundle is created to temporarily save revisions > rev but not descending from the node to strip, to be able to restore the changesets after stripping the changelog. Since this bundle is not kept after the strip operation, and is not user-visible, it is not necessary and should be faster to avoid compression.
author Nicolas Dumazet <nicdumz.commits@gmail.com>
date Thu, 12 Aug 2010 16:53:23 +0900
parents 76454cbc11e4
children 798ef5b19cb1
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1 # repair.py - functions for repository repair for mercurial
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2 #
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3 # Copyright 2005, 2006 Chris Mason <mason@suse.com>
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4 # Copyright 2007 Matt Mackall
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5 #
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6 # This software may be used and distributed according to the terms of the
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7 # GNU General Public License version 2 or any later version.
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8
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9 import changegroup
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10 from node import nullrev, short
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11 from i18n import _
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12 import os
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13
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14 def _bundle(repo, bases, heads, node, suffix, extranodes=None, compress=True):
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15 """create a bundle with the specified revisions as a backup"""
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16 cg = repo.changegroupsubset(bases, heads, 'strip', extranodes)
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17 backupdir = repo.join("strip-backup")
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18 if not os.path.isdir(backupdir):
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19 os.mkdir(backupdir)
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20 name = os.path.join(backupdir, "%s-%s.hg" % (short(node), suffix))
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21 if compress:
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22 bundletype = "HG10BZ"
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23 else:
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24 bundletype = "HG10UN"
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25 return changegroup.writebundle(cg, name, bundletype)
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26
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27 def _collectfiles(repo, striprev):
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28 """find out the filelogs affected by the strip"""
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29 files = set()
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30
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31 for x in xrange(striprev, len(repo)):
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32 files.update(repo[x].files())
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33
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34 return sorted(files)
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35
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36 def _collectextranodes(repo, files, link):
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37 """return the nodes that have to be saved before the strip"""
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38 def collectone(revlog):
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39 extra = []
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40 startrev = count = len(revlog)
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41 # find the truncation point of the revlog
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42 for i in xrange(count):
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43 lrev = revlog.linkrev(i)
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44 if lrev >= link:
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45 startrev = i + 1
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46 break
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47
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48 # see if any revision after that point has a linkrev less than link
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49 # (we have to manually save these guys)
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50 for i in xrange(startrev, count):
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51 node = revlog.node(i)
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52 lrev = revlog.linkrev(i)
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53 if lrev < link:
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54 extra.append((node, cl.node(lrev)))
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55
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56 return extra
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57
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58 extranodes = {}
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59 cl = repo.changelog
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60 extra = collectone(repo.manifest)
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61 if extra:
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62 extranodes[1] = extra
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63 for fname in files:
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64 f = repo.file(fname)
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65 extra = collectone(f)
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66 if extra:
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67 extranodes[fname] = extra
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68
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69 return extranodes
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70
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71 def strip(ui, repo, node, backup="all"):
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72 cl = repo.changelog
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73 # TODO delete the undo files, and handle undo of merge sets
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74 striprev = cl.rev(node)
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75
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76 keeppartialbundle = backup == 'strip'
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77
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78 # Some revisions with rev > striprev may not be descendants of striprev.
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79 # We have to find these revisions and put them in a bundle, so that
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80 # we can restore them after the truncations.
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81 # To create the bundle we use repo.changegroupsubset which requires
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82 # the list of heads and bases of the set of interesting revisions.
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83 # (head = revision in the set that has no descendant in the set;
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84 # base = revision in the set that has no ancestor in the set)
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85 tostrip = set((striprev,))
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86 saveheads = set()
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87 savebases = []
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88 for r in xrange(striprev + 1, len(cl)):
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89 parents = cl.parentrevs(r)
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90 if parents[0] in tostrip or parents[1] in tostrip:
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91 # r is a descendant of striprev
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92 tostrip.add(r)
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93 # if this is a merge and one of the parents does not descend
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94 # from striprev, mark that parent as a savehead.
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95 if parents[1] != nullrev:
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96 for p in parents:
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97 if p not in tostrip and p > striprev:
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98 saveheads.add(p)
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99 else:
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100 # if no parents of this revision will be stripped, mark it as
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101 # a savebase
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102 if parents[0] < striprev and parents[1] < striprev:
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103 savebases.append(cl.node(r))
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104
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105 saveheads.difference_update(parents)
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106 saveheads.add(r)
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107
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108 saveheads = [cl.node(r) for r in saveheads]
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109 files = _collectfiles(repo, striprev)
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110
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111 extranodes = _collectextranodes(repo, files, striprev)
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112
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113 # create a changegroup for all the branches we need to keep
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114 backupfile = None
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115 if backup == "all":
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116 backupfile = _bundle(repo, [node], cl.heads(), node, 'backup')
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117 repo.ui.status(_("saved backup bundle to %s\n") % backupfile)
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118 if saveheads or extranodes:
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Nicolas Dumazet <nicdumz.commits@gmail.com>
parents: 11600
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119 # do not compress partial bundle if we remove it from disk later
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 5910
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120 chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp',
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parents: 11600
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121 extranodes=extranodes, compress=keeppartialbundle)
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Matt Mackall <mpm@selenic.com>
parents:
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122
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Henrik Stuart <henrik.stuart@edlund.dk>
parents: 7361
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123 mfst = repo.manifest
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parents: 7361
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124
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Steve Borho <steve@borho.org>
parents: 10263
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125 tr = repo.transaction("strip")
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Henrik Stuart <henrik.stuart@edlund.dk>
parents: 7361
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126 offset = len(tr.entries)
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parents: 7361
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127
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parents: 10881
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128 try:
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parents: 10881
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129 tr.startgroup()
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Matt Mackall <mpm@selenic.com>
parents: 10881
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130 cl.strip(striprev, tr)
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Matt Mackall <mpm@selenic.com>
parents: 10881
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131 mfst.strip(striprev, tr)
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parents: 10881
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132 for fn in files:
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parents: 10881
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133 repo.file(fn).strip(striprev, tr)
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parents: 10881
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134 tr.endgroup()
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parents: 7361
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135
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Matt Mackall <mpm@selenic.com>
parents: 10881
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136 try:
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Matt Mackall <mpm@selenic.com>
parents: 10881
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137 for i in xrange(offset, len(tr.entries)):
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Matt Mackall <mpm@selenic.com>
parents: 10881
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138 file, troffset, ignore = tr.entries[i]
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Matt Mackall <mpm@selenic.com>
parents: 10881
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139 repo.sopener(file, 'a').truncate(troffset)
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Matt Mackall <mpm@selenic.com>
parents: 10881
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140 tr.close()
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Matt Mackall <mpm@selenic.com>
parents: 10881
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141 except:
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Matt Mackall <mpm@selenic.com>
parents: 10881
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142 tr.abort()
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Matt Mackall <mpm@selenic.com>
parents: 10881
diff changeset
143 raise
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Matt Mackall <mpm@selenic.com>
parents: 10881
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144
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Matt Mackall <mpm@selenic.com>
parents: 10881
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145 if saveheads or extranodes:
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Matt Mackall <mpm@selenic.com>
parents: 11200
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146 ui.note(_("adding branch\n"))
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147 f = open(chgrpfile, "rb")
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parents: 10881
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148 gen = changegroup.readbundle(f, chgrpfile)
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Matt Mackall <mpm@selenic.com>
parents: 11200
diff changeset
149 if not repo.ui.verbose:
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Matt Mackall <mpm@selenic.com>
parents: 11200
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150 # silence internal shuffling chatter
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Matt Mackall <mpm@selenic.com>
parents: 11200
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151 repo.ui.pushbuffer()
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parents: 10881
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152 repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True)
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parents: 11200
diff changeset
153 if not repo.ui.verbose:
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Matt Mackall <mpm@selenic.com>
parents: 11200
diff changeset
154 repo.ui.popbuffer()
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parents: 10881
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155 f.close()
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Nicolas Dumazet <nicdumz.commits@gmail.com>
parents: 11600
diff changeset
156 if not keeppartialbundle:
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parents: 10881
diff changeset
157 os.unlink(chgrpfile)
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Henrik Stuart <henrik.stuart@edlund.dk>
parents: 7361
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158 except:
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parents: 10881
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159 if backupfile:
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Martin Geisler <mg@lazybytes.net>
parents: 11333
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160 ui.warn(_("strip failed, full bundle stored in '%s'\n")
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Martin Geisler <mg@lazybytes.net>
parents: 11333
diff changeset
161 % backupfile)
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Matt Mackall <mpm@selenic.com>
parents: 10881
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162 elif saveheads:
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Martin Geisler <mg@lazybytes.net>
parents: 11333
diff changeset
163 ui.warn(_("strip failed, partial bundle stored in '%s'\n")
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Matt Mackall <mpm@selenic.com>
parents: 10881
diff changeset
164 % chgrpfile)
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Henrik Stuart <henrik.stuart@edlund.dk>
parents: 7361
diff changeset
165 raise
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parents:
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166
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Greg Ward <greg-hg@gerg.ca>
parents: 9125
diff changeset
167 repo.destroyed()