Mercurial > public > mercurial-scm > hg-stable
annotate mercurial/repair.py @ 8073:e8a28556a0a8
strip: make repair.strip transactional to avoid repository corruption
Uses a transaction instance from the local repository to journal the
truncation of revlog files, such that if a strip only partially completes,
hg recover will be able to finish the truncate of all the files.
The potential unbundling of changes that have been backed up to be restored
later will, in case of an error, have to be unbundled manually. The
difference is that it will be possible to recover the repository state so
the unbundle can actually succeed.
author | Henrik Stuart <henrik.stuart@edlund.dk> |
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date | Thu, 16 Apr 2009 15:34:03 +0200 |
parents | 9fe97eea5510 |
children | 46293a0c7e9f |
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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 from i18n import _ |
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12 |
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13 def _bundle(repo, bases, heads, node, suffix, extranodes=None): |
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14 """create a bundle with the specified revisions as a backup""" |
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15 cg = repo.changegroupsubset(bases, heads, 'strip', extranodes) |
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16 backupdir = repo.join("strip-backup") |
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17 if not os.path.isdir(backupdir): |
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18 os.mkdir(backupdir) |
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19 name = os.path.join(backupdir, "%s-%s" % (short(node), suffix)) |
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20 repo.ui.warn(_("saving bundle to %s\n") % name) |
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21 return changegroup.writebundle(cg, name, "HG10BZ") |
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22 |
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23 def _collectfiles(repo, striprev): |
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24 """find out the filelogs affected by the strip""" |
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25 files = {} |
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26 |
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27 for x in xrange(striprev, len(repo)): |
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28 for name in repo[x].files(): |
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29 if name in files: |
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30 continue |
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31 files[name] = 1 |
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32 |
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33 files = files.keys() |
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34 files.sort() |
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35 return files |
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36 |
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37 def _collectextranodes(repo, files, link): |
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38 """return the nodes that have to be saved before the strip""" |
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39 def collectone(revlog): |
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40 extra = [] |
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41 startrev = count = len(revlog) |
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42 # find the truncation point of the revlog |
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43 for i in xrange(0, count): |
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44 lrev = revlog.linkrev(i) |
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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(i) |
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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 striprev = cl.rev(node) |
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76 |
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77 # Some revisions with rev > striprev may not be descendants of striprev. |
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78 # We have to find these revisions and put them in a bundle, so that |
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79 # we can restore them after the truncations. |
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80 # To create the bundle we use repo.changegroupsubset which requires |
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81 # the list of heads and bases of the set of interesting revisions. |
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82 # (head = revision in the set that has no descendant in the set; |
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83 # base = revision in the set that has no ancestor in the set) |
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84 tostrip = {striprev: 1} |
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85 saveheads = {} |
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86 savebases = [] |
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87 for r in xrange(striprev + 1, len(cl)): |
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88 parents = cl.parentrevs(r) |
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89 if parents[0] in tostrip or parents[1] in tostrip: |
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90 # r is a descendant of striprev |
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91 tostrip[r] = 1 |
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92 # if this is a merge and one of the parents does not descend |
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93 # from striprev, mark that parent as a savehead. |
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94 if parents[1] != nullrev: |
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95 for p in parents: |
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96 if p not in tostrip and p > striprev: |
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97 saveheads[p] = 1 |
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98 else: |
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99 # if no parents of this revision will be stripped, mark it as |
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100 # a savebase |
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101 if parents[0] < striprev and parents[1] < striprev: |
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102 savebases.append(cl.node(r)) |
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103 |
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104 for p in parents: |
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105 if p in saveheads: |
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106 del saveheads[p] |
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107 saveheads[r] = 1 |
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108 |
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109 saveheads = [cl.node(r) for r in saveheads] |
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110 files = _collectfiles(repo, striprev) |
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111 |
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112 extranodes = _collectextranodes(repo, files, striprev) |
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113 |
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114 # create a changegroup for all the branches we need to keep |
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115 if backup == "all": |
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116 _bundle(repo, [node], cl.heads(), node, 'backup') |
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117 if saveheads or extranodes: |
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118 chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp', |
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119 extranodes) |
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120 |
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121 fs = [repo.file(name) for name in files] |
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122 mfst = repo.manifest |
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123 |
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124 tr = repo.transaction() |
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125 offset = len(tr.entries) |
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126 |
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127 cl.strip(striprev, tr) |
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128 mfst.strip(striprev, tr) |
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129 for f in fs: |
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130 f.strip(striprev, tr) |
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131 |
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132 try: |
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133 for i in xrange(offset, len(tr.entries)): |
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134 file, troffset, ignore = tr.entries[i] |
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135 repo.sopener(file, 'a').truncate(troffset) |
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136 tr.close() |
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137 except: |
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138 tr.abort() |
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139 raise |
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140 |
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141 if saveheads or extranodes: |
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142 ui.status(_("adding branch\n")) |
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143 f = open(chgrpfile, "rb") |
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144 gen = changegroup.readbundle(f, chgrpfile) |
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145 repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True) |
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146 f.close() |
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147 if backup != "strip": |
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148 os.unlink(chgrpfile) |
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149 |