Mercurial > hg
annotate mercurial/repair.py @ 6858:8f256bf98219
Add support for multiple possible bisect results (issue1228, issue1182)
The real reason for both issue is that bisect can not handle cases where there
are multiple possibilities for the result.
Example (from issue1228):
rev 0 -> good
rev 1 -> skipped
rev 2 -> skipped
rev 3 -> skipped
rev 4 -> bad
Note that this patch does not only fix the reported Assertion Error but also
the problem of a non converging bisect:
hg init
for i in `seq 3`; do echo $i > $i; hg add $i; hg ci -m$i; done
hg bisect -b 2
hg bisect -g 0
hg bisect -s
From this state on, you can:
a) mark as bad forever (non converging!)
b) mark as good to get an inconsistent state
c) skip for the Assertion Error
Minor description and code edits by pmezard.
author | Bernhard Leiner <bleiner@gmail.com> |
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date | Sat, 02 Aug 2008 22:10:10 +0200 |
parents | f89fd07fc51d |
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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 nullrev, short |
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11 |
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12 def _bundle(repo, bases, heads, node, suffix, extranodes=None): |
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13 """create a bundle with the specified revisions as a backup""" |
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14 cg = repo.changegroupsubset(bases, heads, 'strip', extranodes) |
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15 backupdir = repo.join("strip-backup") |
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16 if not os.path.isdir(backupdir): |
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17 os.mkdir(backupdir) |
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18 name = os.path.join(backupdir, "%s-%s" % (short(node), suffix)) |
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19 repo.ui.warn("saving bundle to %s\n" % name) |
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20 return changegroup.writebundle(cg, name, "HG10BZ") |
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21 |
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22 def _collectfiles(repo, striprev): |
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23 """find out the filelogs affected by the strip""" |
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24 files = {} |
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25 |
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26 for x in xrange(striprev, repo.changelog.count()): |
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27 for name in repo.changectx(x).files(): |
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28 if name in files: |
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29 continue |
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30 files[name] = 1 |
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31 |
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32 files = files.keys() |
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33 files.sort() |
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34 return 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 = revlog.count() |
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41 # find the truncation point of the revlog |
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42 for i in xrange(0, count): |
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43 node = revlog.node(i) |
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44 lrev = revlog.linkrev(node) |
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45 if lrev >= link: |
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46 startrev = i + 1 |
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47 break |
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48 |
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49 # see if any revision after that point has a linkrev less than link |
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50 # (we have to manually save these guys) |
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51 for i in xrange(startrev, count): |
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52 node = revlog.node(i) |
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53 lrev = revlog.linkrev(node) |
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54 if lrev < link: |
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55 extra.append((node, cl.node(lrev))) |
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56 |
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57 return extra |
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58 |
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59 extranodes = {} |
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60 cl = repo.changelog |
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61 extra = collectone(repo.manifest) |
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62 if extra: |
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63 extranodes[1] = extra |
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64 for fname in files: |
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65 f = repo.file(fname) |
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66 extra = collectone(f) |
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67 if extra: |
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68 extranodes[fname] = extra |
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69 |
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70 return extranodes |
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71 |
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72 def strip(ui, repo, node, backup="all"): |
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73 cl = repo.changelog |
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74 # TODO delete the undo files, and handle undo of merge sets |
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75 pp = cl.parents(node) |
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76 striprev = cl.rev(node) |
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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 = {striprev: 1} |
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86 saveheads = {} |
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87 savebases = [] |
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88 for r in xrange(striprev + 1, cl.count()): |
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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[r] = 1 |
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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[p] = 1 |
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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 for p in parents: |
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106 if p in saveheads: |
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107 del saveheads[p] |
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108 saveheads[r] = 1 |
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109 |
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110 saveheads = [cl.node(r) for r in saveheads] |
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111 files = _collectfiles(repo, striprev) |
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112 |
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113 extranodes = _collectextranodes(repo, files, striprev) |
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114 |
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115 # create a changegroup for all the branches we need to keep |
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116 if backup == "all": |
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117 _bundle(repo, [node], cl.heads(), node, 'backup') |
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118 if saveheads or extranodes: |
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119 chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp', |
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120 extranodes) |
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121 |
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122 cl.strip(striprev) |
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123 repo.manifest.strip(striprev) |
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124 for name in files: |
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125 f = repo.file(name) |
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126 f.strip(striprev) |
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127 |
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128 if saveheads or extranodes: |
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129 ui.status("adding branch\n") |
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130 f = open(chgrpfile, "rb") |
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131 gen = changegroup.readbundle(f, chgrpfile) |
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132 repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True) |
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133 f.close() |
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134 if backup != "strip": |
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135 os.unlink(chgrpfile) |
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136 |