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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, incorporated herein by reference.
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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):
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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" % (short(node), suffix))
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21 repo.ui.warn(_("saving bundle to %s\n") % name)
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22 return changegroup.writebundle(cg, name, "HG10BZ")
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23
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24 def _collectfiles(repo, striprev):
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25 """find out the filelogs affected by the strip"""
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26 files = set()
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27
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28 for x in xrange(striprev, len(repo)):
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29 files.update(repo[x].files())
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30
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31 return sorted(files)
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32
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33 def _collectextranodes(repo, files, link):
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34 """return the nodes that have to be saved before the strip"""
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35 def collectone(revlog):
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36 extra = []
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37 startrev = count = len(revlog)
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38 # find the truncation point of the revlog
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39 for i in xrange(count):
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40 lrev = revlog.linkrev(i)
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41 if lrev >= link:
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42 startrev = i + 1
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43 break
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44
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45 # see if any revision after that point has a linkrev less than link
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46 # (we have to manually save these guys)
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47 for i in xrange(startrev, count):
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48 node = revlog.node(i)
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49 lrev = revlog.linkrev(i)
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50 if lrev < link:
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51 extra.append((node, cl.node(lrev)))
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52
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53 return extra
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54
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55 extranodes = {}
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56 cl = repo.changelog
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57 extra = collectone(repo.manifest)
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58 if extra:
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59 extranodes[1] = extra
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60 for fname in files:
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61 f = repo.file(fname)
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62 extra = collectone(f)
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63 if extra:
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64 extranodes[fname] = extra
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65
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66 return extranodes
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67
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68 def strip(ui, repo, node, backup="all"):
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69 cl = repo.changelog
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70 # TODO delete the undo files, and handle undo of merge sets
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71 striprev = cl.rev(node)
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72
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73 # Some revisions with rev > striprev may not be descendants of striprev.
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74 # We have to find these revisions and put them in a bundle, so that
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75 # we can restore them after the truncations.
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76 # To create the bundle we use repo.changegroupsubset which requires
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77 # the list of heads and bases of the set of interesting revisions.
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78 # (head = revision in the set that has no descendant in the set;
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79 # base = revision in the set that has no ancestor in the set)
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80 tostrip = set((striprev,))
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81 saveheads = set()
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82 savebases = []
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83 for r in xrange(striprev + 1, len(cl)):
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84 parents = cl.parentrevs(r)
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85 if parents[0] in tostrip or parents[1] in tostrip:
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86 # r is a descendant of striprev
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87 tostrip.add(r)
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88 # if this is a merge and one of the parents does not descend
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89 # from striprev, mark that parent as a savehead.
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90 if parents[1] != nullrev:
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91 for p in parents:
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92 if p not in tostrip and p > striprev:
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93 saveheads.add(p)
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94 else:
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95 # if no parents of this revision will be stripped, mark it as
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96 # a savebase
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97 if parents[0] < striprev and parents[1] < striprev:
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98 savebases.append(cl.node(r))
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99
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100 saveheads.difference_update(parents)
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101 saveheads.add(r)
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102
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103 saveheads = [cl.node(r) for r in saveheads]
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104 files = _collectfiles(repo, striprev)
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105
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106 extranodes = _collectextranodes(repo, files, striprev)
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107
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108 # create a changegroup for all the branches we need to keep
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109 if backup == "all":
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110 _bundle(repo, [node], cl.heads(), node, 'backup')
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111 if saveheads or extranodes:
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112 chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp',
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113 extranodes)
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114
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115 mfst = repo.manifest
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116
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117 tr = repo.transaction()
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118 offset = len(tr.entries)
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119
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120 tr.startgroup()
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121 cl.strip(striprev, tr)
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122 mfst.strip(striprev, tr)
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123 for fn in files:
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124 repo.file(fn).strip(striprev, tr)
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125 tr.endgroup()
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126
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127 try:
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128 for i in xrange(offset, len(tr.entries)):
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129 file, troffset, ignore = tr.entries[i]
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130 repo.sopener(file, 'a').truncate(troffset)
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131 tr.close()
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132 except:
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133 tr.abort()
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134 raise
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135
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136 if saveheads or extranodes:
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137 ui.status(_("adding branch\n"))
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138 f = open(chgrpfile, "rb")
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139 gen = changegroup.readbundle(f, chgrpfile)
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140 repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True)
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141 f.close()
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142 if backup != "strip":
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143 os.unlink(chgrpfile)
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144
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