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annotate contrib/shrink-revlog.py @ 10621:c93f0a23f381

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shrink-revlog: rename some local variables for consistency.
author Greg Ward <greg-hg@gerg.ca>
date Tue, 09 Mar 2010 21:30:19 -0500
parents 1ee14abe07b4
children bc81f126139f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python
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2
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3 """\
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4 reorder a revlog (the manifest by default) to save space
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5
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6 Specifically, this topologically sorts the revisions in the revlog so that
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7 revisions on the same branch are adjacent as much as possible. This is a
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8 workaround for the fact that Mercurial computes deltas relative to the
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9 previous revision rather than relative to a parent revision.
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10
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11 This is *not* safe to run on a changelog.
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12 """
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13
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14 # Originally written by Benoit Boissinot <benoit.boissinot at ens-lyon.org>
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15 # as a patch to rewrite-log. Cleaned up, refactored, documented, and
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16 # renamed by Greg Ward <greg at gerg.ca>.
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17
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18 # XXX would be nice to have a way to verify the repository after shrinking,
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19 # e.g. by comparing "before" and "after" states of random changesets
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20 # (maybe: export before, shrink, export after, diff).
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21
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22 import os, tempfile, errno
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23 from mercurial import revlog, transaction, node, util
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24 from mercurial import changegroup
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25 from mercurial.i18n import _
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26
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27 def toposort(ui, rl):
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28
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29 children = {}
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30 root = []
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31 # build children and roots
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32 ui.status(_('reading revs\n'))
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33 try:
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34 for rev in rl:
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35 ui.progress(_('reading'), rev, total=len(rl))
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36 children[rev] = []
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37 parents = [p for p in rl.parentrevs(rev) if p != node.nullrev]
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38 # in case of duplicate parents
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39 if len(parents) == 2 and parents[0] == parents[1]:
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40 del parents[1]
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41 for p in parents:
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42 assert p in children
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43 children[p].append(rev)
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44
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45 if len(parents) == 0:
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46 root.append(rev)
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47 finally:
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48 ui.progress(_('reading'), None, total=len(rl))
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49
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50 # XXX this is a reimplementation of the 'branchsort' topo sort
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51 # algorithm in hgext.convert.convcmd... would be nice not to duplicate
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52 # the algorithm
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53 ui.status(_('sorting revs\n'))
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54 visit = root
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55 result = []
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56
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57 # suboptimal: nodes whose predecessor is not first parent
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58 suboptimal = 0
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59
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60 while visit:
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61 cur = visit.pop(0)
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62 # revlog will compute delta relative to result[-1], so keep track
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63 # of nodes where this might result in a large delta
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64 parents = rl.parentrevs(cur)
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65 if result:
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66 if result[-1] != parents[0]:
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67 suboptimal += 1
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68
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69 result.append(cur)
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70 if cur not in children:
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71 # This only happens if some node's p1 == p2, which can
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72 # happen in the manifest in certain circumstances.
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73 continue
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74 next = []
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75 for c in children.pop(cur):
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76 parents_unseen = [p for p in rl.parentrevs(c)
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77 if p != node.nullrev and p in children]
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78 if len(parents_unseen) == 0:
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79 next.append(c)
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80 visit = next + visit
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81 ui.note(_('%d suboptimal nodes\n') % suboptimal)
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82 return result
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83
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84 def writerevs(ui, r1, r2, order, tr):
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85
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86 ui.status(_('writing revs\n'))
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87
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88 count = [0]
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89 def progress(*args):
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90 ui.progress(_('writing'), count[0], total=len(order))
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91 count[0] += 1
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92
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93 order = [r1.node(r) for r in order]
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94
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95 # this is a bit ugly, but it works
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96 lookup = lambda x: "%020d" % r1.linkrev(r1.rev(x))
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97 unlookup = lambda x: int(x, 10)
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98
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99 try:
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100 group = util.chunkbuffer(r1.group(order, lookup, progress))
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101 chunkiter = changegroup.chunkiter(group)
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102 r2.addgroup(chunkiter, unlookup, tr)
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103 finally:
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104 ui.progress(_('writing'), None, len(order))
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105
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106 def report(ui, r1, r2):
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107 def getsize(r):
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108 s = 0
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109 for fn in (r.indexfile, r.datafile):
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110 try:
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111 s += os.stat(fn).st_size
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112 except OSError, inst:
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113 if inst.errno != errno.ENOENT:
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114 raise
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115 return s
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116
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117 oldsize = float(getsize(r1))
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118 newsize = float(getsize(r2))
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119
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120 # argh: have to pass an int to %d, because a float >= 2^32
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121 # blows up under Python 2.5 or earlier
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122 ui.write(_('old file size: %12d bytes (%6.1f MiB)\n')
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123 % (int(oldsize), oldsize / 1024 / 1024))
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124 ui.write(_('new file size: %12d bytes (%6.1f MiB)\n')
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125 % (int(newsize), newsize / 1024 / 1024))
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126
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127 shrink_percent = (oldsize - newsize) / oldsize * 100
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128 shrink_factor = oldsize / newsize
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129 ui.write(_('shrinkage: %.1f%% (%.1fx)\n')
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130 % (shrink_percent, shrink_factor))
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131
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diff changeset
132 def shrink(ui, repo, **opts):
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133 """
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134 Shrink revlog by re-ordering revisions. Will operate on manifest for
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135 the given repository if no other revlog is specified."""
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136
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diff changeset
137 if not repo.local():
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138 raise util.Abort(_('not a local repository: %s') % repo.root)
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139
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diff changeset
140 fn = opts.get('revlog')
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diff changeset
141 if not fn:
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diff changeset
142 indexfn = repo.sjoin('00manifest.i')
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diff changeset
143 else:
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diff changeset
144 if not fn.endswith('.i'):
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diff changeset
145 raise util.Abort(_('--revlog option must specify the revlog index '
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diff changeset
146 'file (*.i), not %s') % opts.get('revlog'))
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147
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diff changeset
148 indexfn = os.path.realpath(fn)
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diff changeset
149 store = repo.sjoin('')
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150 if not indexfn.startswith(store):
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diff changeset
151 raise util.Abort(_('--revlog option must specify a revlog in %s, '
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152 'not %s') % (store, indexfn))
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153
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154 if not os.path.exists(indexfn):
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155 raise util.Abort(_('no such file: %s') % indexfn)
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156 if '00changelog' in indexfn:
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157 raise util.Abort(_('shrinking the changelog '
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158 'will corrupt your repository'))
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159
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diff changeset
160 ui.write(_('shrinking %s\n') % indexfn)
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diff changeset
161 prefix = os.path.basename(indexfn)[:-1]
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diff changeset
162 (tmpfd, tmpindexfn) = tempfile.mkstemp(dir=os.path.dirname(indexfn),
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diff changeset
163 prefix=prefix,
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diff changeset
164 suffix='.i')
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diff changeset
165 os.close(tmpfd)
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diff changeset
166
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diff changeset
167 r1 = revlog.revlog(util.opener(os.getcwd(), audit=False), indexfn)
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diff changeset
168 r2 = revlog.revlog(util.opener(os.getcwd(), audit=False), tmpindexfn)
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169
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diff changeset
170 datafn, tmpdatafn = r1.datafile, r2.datafile
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171
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172 oldindexfn = indexfn + '.old'
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diff changeset
173 olddatafn = datafn + '.old'
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diff changeset
174 if os.path.exists(oldindexfn) or os.path.exists(olddatafn):
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diff changeset
175 raise util.Abort(_('one or both of\n'
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diff changeset
176 ' %s\n'
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diff changeset
177 ' %s\n'
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diff changeset
178 'exists from a previous run; please clean up '
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parents: 10496
diff changeset
179 'before running again') % (oldindexfn, olddatafn))
9515
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parents:
diff changeset
180
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diff changeset
181 # Don't use repo.transaction(), because then things get hairy with
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parents:
diff changeset
182 # paths: some need to be relative to .hg, and some need to be
10216
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diff changeset
183 # absolute. Doing it this way keeps things simple: everything is an
9515
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parents:
diff changeset
184 # absolute path.
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diff changeset
185 lock = repo.lock(wait=False)
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diff changeset
186 tr = transaction.transaction(ui.warn,
9515
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parents:
diff changeset
187 open,
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diff changeset
188 repo.sjoin('journal'))
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diff changeset
189
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diff changeset
190 def ignoremissing(func):
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diff changeset
191 def f(*args, **kw):
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diff changeset
192 try:
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diff changeset
193 return func(*args, **kw)
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diff changeset
194 except OSError, inst:
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diff changeset
195 if inst.errno != errno.ENOENT:
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diff changeset
196 raise
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diff changeset
197 return f
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diff changeset
198
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diff changeset
199 try:
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Greg Ward <greg-hg@gerg.ca>
parents:
diff changeset
200 try:
10213
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Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10009
diff changeset
201 order = toposort(ui, r1)
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parents: 10009
diff changeset
202 writerevs(ui, r1, r2, order, tr)
10542
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diff changeset
203 report(ui, r1, r2)
9515
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parents:
diff changeset
204 tr.close()
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parents:
diff changeset
205 except:
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parents:
diff changeset
206 # Abort transaction first, so we truncate the files before
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Greg Ward <greg-hg@gerg.ca>
parents:
diff changeset
207 # deleting them.
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Greg Ward <greg-hg@gerg.ca>
parents:
diff changeset
208 tr.abort()
10542
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diff changeset
209 for fn in (tmpindexfn, tmpdatafn):
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diff changeset
210 ignoremissing(os.unlink)(fn)
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parents:
diff changeset
211 raise
10241
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diff changeset
212 if not opts.get('dry_run'):
10542
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diff changeset
213 # racy, both files cannot be renamed atomically
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diff changeset
214 # copy files
10241
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diff changeset
215 util.os_link(indexfn, oldindexfn)
10542
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diff changeset
216 ignoremissing(util.os_link)(datafn, olddatafn)
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diff changeset
217 # rename
10241
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diff changeset
218 util.rename(tmpindexfn, indexfn)
10542
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diff changeset
219 try:
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diff changeset
220 util.rename(tmpdatafn, datafn)
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parents: 10509
diff changeset
221 except OSError, inst:
989b2a5eaaba shrink: handle all combinations of inline/non-inline revlogs
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parents: 10509
diff changeset
222 if inst.errno != errno.ENOENT:
989b2a5eaaba shrink: handle all combinations of inline/non-inline revlogs
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 10509
diff changeset
223 raise
989b2a5eaaba shrink: handle all combinations of inline/non-inline revlogs
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parents: 10509
diff changeset
224 ignoremissing(os.unlink)(datafn)
10241
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diff changeset
225 else:
10542
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diff changeset
226 for fn in (tmpindexfn, tmpdatafn):
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diff changeset
227 ignoremissing(os.unlink)(fn)
9515
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parents:
diff changeset
228 finally:
f7d85980261c Add script to rewrite revlog to workaround lack of parent deltas.
Greg Ward <greg-hg@gerg.ca>
parents:
diff changeset
229 lock.release()
f7d85980261c Add script to rewrite revlog to workaround lack of parent deltas.
Greg Ward <greg-hg@gerg.ca>
parents:
diff changeset
230
10241
4b2a086bee31 shrink-revlog: add --dry-run option
Patrick Mezard <pmezard@gmail.com>
parents: 10236
diff changeset
231 if not opts.get('dry_run'):
10508
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diff changeset
232 ui.write(_('note: old revlog saved in:\n'
cc35ad583e66 shrink-revlog: add strings for translation / import _ before using it
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 10496
diff changeset
233 ' %s\n'
cc35ad583e66 shrink-revlog: add strings for translation / import _ before using it
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parents: 10496
diff changeset
234 ' %s\n'
cc35ad583e66 shrink-revlog: add strings for translation / import _ before using it
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parents: 10496
diff changeset
235 '(You can delete those files when you are satisfied that your\n'
cc35ad583e66 shrink-revlog: add strings for translation / import _ before using it
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 10496
diff changeset
236 'repository is still sane. '
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 10496
diff changeset
237 'Running \'hg verify\' is strongly recommended.)\n')
10241
4b2a086bee31 shrink-revlog: add --dry-run option
Patrick Mezard <pmezard@gmail.com>
parents: 10236
diff changeset
238 % (oldindexfn, olddatafn))
9515
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parents:
diff changeset
239
10215
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Dirkjan Ochtman <dirkjan@ochtman.nl>
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diff changeset
240 cmdtable = {
9d79b8f58bea contrib: turn shrink-revlog.py into an extension
Dirkjan Ochtman <dirkjan@ochtman.nl>
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diff changeset
241 'shrink': (shrink,
10508
cc35ad583e66 shrink-revlog: add strings for translation / import _ before using it
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 10496
diff changeset
242 [('', 'revlog', '', _('index (.i) file of the revlog to shrink')),
cc35ad583e66 shrink-revlog: add strings for translation / import _ before using it
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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diff changeset
243 ('n', 'dry-run', None, _('do not shrink, simulate only')),
10241
4b2a086bee31 shrink-revlog: add --dry-run option
Patrick Mezard <pmezard@gmail.com>
parents: 10236
diff changeset
244 ],
10508
cc35ad583e66 shrink-revlog: add strings for translation / import _ before using it
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parents: 10496
diff changeset
245 _('hg shrink [--revlog PATH]'))
10215
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Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 10214
diff changeset
246 }
10236
49a8625b8cac shrink-revlog: help/doc tweaks
Greg Ward <greg-hg@gerg.ca>
parents: 10234
diff changeset
247
49a8625b8cac shrink-revlog: help/doc tweaks
Greg Ward <greg-hg@gerg.ca>
parents: 10234
diff changeset
248 if __name__ == "__main__":
10282
08a0f04b56bd many, many trivial check-code fixups
Matt Mackall <mpm@selenic.com>
parents: 10241
diff changeset
249 print "shrink-revlog.py is now an extension (see hg help extensions)"