annotate mercurial/repair.py @ 5956:094638b3cbed

convert: checkout svn root revisions Using changed files is enough if whole history is converted. Checkouts are required to restrict the conversion to user-supplied subtree.
author Patrick Mezard <pmezard@gmail.com>
date Sat, 26 Jan 2008 14:45:04 +0100
parents b9a830fa10f6
children 53ae5af55db3
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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
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7 # of the GNU General Public License, incorporated herein by reference.
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8
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9 import changegroup, os
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10 from node import *
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11
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12 def _limitheads(cl, stoprev):
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13 """return the list of all revs >= stoprev that have no children"""
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14 seen = {}
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15 heads = []
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16
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17 for r in xrange(cl.count() - 1, stoprev - 1, -1):
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18 if r not in seen:
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19 heads.append(r)
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20 for p in cl.parentrevs(r):
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21 seen[p] = 1
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22 return heads
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23
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24 def _bundle(repo, bases, heads, node, suffix, extranodes=None):
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25 """create a bundle with the specified revisions as a backup"""
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26 cg = repo.changegroupsubset(bases, heads, 'strip', extranodes)
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27 backupdir = repo.join("strip-backup")
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28 if not os.path.isdir(backupdir):
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29 os.mkdir(backupdir)
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30 name = os.path.join(backupdir, "%s-%s" % (short(node), suffix))
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31 repo.ui.warn("saving bundle to %s\n" % name)
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32 return changegroup.writebundle(cg, name, "HG10BZ")
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33
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34 def _collectfiles(repo, striprev):
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35 """find out the filelogs affected by the strip"""
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36 files = {}
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37
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38 for x in xrange(striprev, repo.changelog.count()):
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39 for name in repo.changectx(x).files():
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40 if name in files:
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41 continue
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42 files[name] = 1
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43
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44 files = files.keys()
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45 files.sort()
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46 return files
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48 def _collectextranodes(repo, files, link):
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49 """return the nodes that have to be saved before the strip"""
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50 def collectone(revlog):
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51 extra = []
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52 startrev = count = revlog.count()
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53 # find the truncation point of the revlog
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54 for i in xrange(0, count):
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55 node = revlog.node(i)
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56 lrev = revlog.linkrev(node)
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57 if lrev >= link:
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58 startrev = i + 1
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59 break
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60
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61 # see if any revision after that point has a linkrev less than link
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62 # (we have to manually save these guys)
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63 for i in xrange(startrev, count):
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64 node = revlog.node(i)
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65 lrev = revlog.linkrev(node)
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66 if lrev < link:
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67 extra.append((node, cl.node(lrev)))
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68
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69 return extra
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70
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71 extranodes = {}
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72 cl = repo.changelog
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73 extra = collectone(repo.manifest)
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74 if extra:
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75 extranodes[1] = extra
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76 for fname in files:
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77 f = repo.file(fname)
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78 extra = collectone(f)
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79 if extra:
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80 extranodes[fname] = extra
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81
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82 return extranodes
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83
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84 def strip(ui, repo, node, backup="all"):
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85 cl = repo.changelog
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86 # TODO delete the undo files, and handle undo of merge sets
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87 pp = cl.parents(node)
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88 striprev = cl.rev(node)
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89
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90 # save is a list of all the branches we are truncating away
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91 # that we actually want to keep. changegroup will be used
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92 # to preserve them and add them back after the truncate
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93 saveheads = []
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94 savebases = {}
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95
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96 heads = [cl.node(r) for r in _limitheads(cl, striprev)]
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97 seen = {}
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98
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99 # search through all the heads, finding those where the revision
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100 # we want to strip away is an ancestor. Also look for merges
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101 # that might be turned into new heads by the strip.
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102 while heads:
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103 h = heads.pop()
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104 n = h
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105 while True:
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106 seen[n] = 1
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107 pp = cl.parents(n)
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108 if pp[1] != nullid:
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109 for p in pp:
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110 if cl.rev(p) > striprev and p not in seen:
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111 heads.append(p)
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112 if pp[0] == nullid:
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113 break
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114 if cl.rev(pp[0]) < striprev:
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115 break
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116 n = pp[0]
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117 if n == node:
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118 break
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119 r = cl.reachable(h, node)
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120 if node not in r:
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121 saveheads.append(h)
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122 for x in r:
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123 if cl.rev(x) > striprev:
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124 savebases[x] = 1
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125
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126 files = _collectfiles(repo, striprev)
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127
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128 extranodes = _collectextranodes(repo, files, striprev)
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129
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130 # create a changegroup for all the branches we need to keep
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131 if backup == "all":
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132 _bundle(repo, [node], cl.heads(), node, 'backup')
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133 if saveheads or extranodes:
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134 chgrpfile = _bundle(repo, savebases.keys(), saveheads, node, 'temp',
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135 extranodes)
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136
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137 cl.strip(striprev)
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138 repo.manifest.strip(striprev)
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139 for name in files:
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140 f = repo.file(name)
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141 f.strip(striprev)
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142
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143 if saveheads or extranodes:
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144 ui.status("adding branch\n")
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145 f = open(chgrpfile, "rb")
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146 gen = changegroup.readbundle(f, chgrpfile)
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147 repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True)
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148 f.close()
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149 if backup != "strip":
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150 os.unlink(chgrpfile)
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151