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annotate contrib/shrink-revlog.py @ 10215:9d79b8f58bea

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contrib: turn shrink-revlog.py into an extension
author Dirkjan Ochtman <dirkjan@ochtman.nl>
date Thu, 07 Jan 2010 16:06:12 +0100
parents 8111f9988c9d
children 843f6ee6d14b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 (by default the the manifest file in the current
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5 repository) to save space. Specifically, this topologically sorts the
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6 revisions in the revlog so that revisions on the same branch are adjacent
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7 as much as possible. This is a workaround for the fact that Mercurial
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8 computes deltas relative to the previous revision rather than relative to a
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9 parent revision. This is *not* safe to run on a changelog.
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10 """
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11
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12 # Originally written by Benoit Boissinot <benoit.boissinot at ens-lyon.org>
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13 # as a patch to rewrite-log. Cleaned up, refactored, documented, and
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14 # renamed by Greg Ward <greg at gerg.ca>.
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15
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16 # XXX would be nice to have a way to verify the repository after shrinking,
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17 # e.g. by comparing "before" and "after" states of random changesets
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18 # (maybe: export before, shrink, export after, diff).
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19
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20 import sys, os, tempfile
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21 import optparse
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22 from mercurial import ui as ui_, hg, revlog, transaction, node, util
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23 from mercurial import changegroup
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24
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25 def toposort(ui, rl):
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26
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27 children = {}
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28 root = []
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29 # build children and roots
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30 ui.write('reading %d revs ' % len(rl))
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31 try:
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32 for i in rl:
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33 children[i] = []
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34 parents = [p for p in rl.parentrevs(i) if p != node.nullrev]
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35 # in case of duplicate parents
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36 if len(parents) == 2 and parents[0] == parents[1]:
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37 del parents[1]
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38 for p in parents:
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39 assert p in children
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40 children[p].append(i)
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41
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42 if len(parents) == 0:
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43 root.append(i)
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44
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45 if i % 1000 == 0:
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46 ui.write('.')
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47 finally:
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48 ui.write('\n')
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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.write('sorting ...')
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54 visit = root
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55 ret = []
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56 while visit:
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57 i = visit.pop(0)
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58 ret.append(i)
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59 if i not in children:
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60 # This only happens if some node's p1 == p2, which can
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61 # happen in the manifest in certain circumstances.
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62 continue
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63 next = []
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64 for c in children.pop(i):
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65 parents_unseen = [p for p in rl.parentrevs(c)
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66 if p != node.nullrev and p in children]
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67 if len(parents_unseen) == 0:
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68 next.append(c)
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69 visit = next + visit
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70 ui.write('\n')
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71 return ret
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72
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73 def writerevs(ui, r1, r2, order, tr):
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74
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75 ui.write('writing %d revs ' % len(order))
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76 count = [0]
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77 def progress(*args):
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78 if count[0] % 1000 == 0:
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79 ui.write('.')
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80 count[0] += 1
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81
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82 order = [r1.node(r) for r in order]
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83
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84 # this is a bit ugly, but it works
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85 lookup = lambda x: "%020d" % r1.linkrev(r1.rev(x))
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86 unlookup = lambda x: int(x, 10)
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87
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88 try:
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89 group = util.chunkbuffer(r1.group(order, lookup, progress))
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90 chunkiter = changegroup.chunkiter(group)
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91 r2.addgroup(chunkiter, unlookup, tr)
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92 finally:
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93 ui.write('\n')
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94
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95 def report(ui, olddatafn, newdatafn):
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96 oldsize = float(os.stat(olddatafn).st_size)
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97 newsize = float(os.stat(newdatafn).st_size)
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98
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99 # argh: have to pass an int to %d, because a float >= 2^32
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100 # blows up under Python 2.5 or earlier
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101 ui.write('old file size: %12d bytes (%6.1f MiB)\n'
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102 % (int(oldsize), oldsize/1024/1024))
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103 ui.write('new file size: %12d bytes (%6.1f MiB)\n'
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104 % (int(newsize), newsize/1024/1024))
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105
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106 shrink_percent = (oldsize - newsize) / oldsize * 100
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107 shrink_factor = oldsize / newsize
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108 ui.write('shrinkage: %.1f%% (%.1fx)\n' % (shrink_percent, shrink_factor))
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109
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110 def shrink(ui, repo, **opts):
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111 """
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112 Shrink revlog by re-ordering revisions. Will operate on manifest for
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113 the given repository if no other revlog is specified."""
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114
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115 # Unbuffer stdout for nice progress output.
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116 sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
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117
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118 if not repo.local():
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119 raise util.Abort('not a local repository: %s' % repo.root)
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120
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121 fn = opts.get('revlog')
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122 if not fn:
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123 indexfn = repo.sjoin('00manifest.i')
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124 else:
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125 if not fn.endswith('.i'):
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126 raise util.Abort('--revlog option must specify the revlog index '
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127 'file (*.i), not %s' % opts.get('revlog'))
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128
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129 indexfn = os.path.realpath(fn)
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130 store = repo.sjoin('')
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131 if not indexfn.startswith(store):
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132 raise util.Abort('--revlog option must specify a revlog in %s, '
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133 'not %s' % (store, indexfn))
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134
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135 datafn = indexfn[:-2] + '.d'
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136 if not os.path.exists(indexfn):
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137 raise util.Abort('no such file: %s' % indexfn)
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138 if '00changelog' in indexfn:
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139 raise util.Abort('shrinking the changelog will corrupt your repository')
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140 if not os.path.exists(datafn):
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141 # This is just a lazy shortcut because I can't be bothered to
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142 # handle all the special cases that entail from no .d file.
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143 raise util.Abort('%s does not exist: revlog not big enough '
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144 'to be worth shrinking' % datafn)
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145
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146 oldindexfn = indexfn + '.old'
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147 olddatafn = datafn + '.old'
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148 if os.path.exists(oldindexfn) or os.path.exists(olddatafn):
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149 raise util.Abort('one or both of\n'
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150 ' %s\n'
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151 ' %s\n'
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152 'exists from a previous run; please clean up before '
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153 'running again' % (oldindexfn, olddatafn))
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154
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155 ui.write('shrinking %s\n' % indexfn)
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156 prefix = os.path.basename(indexfn)[:-1]
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157 (tmpfd, tmpindexfn) = tempfile.mkstemp(dir=os.path.dirname(indexfn),
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158 prefix=prefix,
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159 suffix='.i')
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160 tmpdatafn = tmpindexfn[:-2] + '.d'
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161 os.close(tmpfd)
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162
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163 r1 = revlog.revlog(util.opener(os.getcwd(), audit=False), indexfn)
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164 r2 = revlog.revlog(util.opener(os.getcwd(), audit=False), tmpindexfn)
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165
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166 # Don't use repo.transaction(), because then things get hairy with
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167 # paths: some need to be relative to .hg, and some need to be
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168 # absolute. Doing it this way keeps things simple: everything is an
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169 # absolute path.
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170 lock = repo.lock(wait=False)
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171 tr = transaction.transaction(sys.stderr.write,
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172 open,
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173 repo.sjoin('journal'))
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174
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175 try:
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176 try:
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177 order = toposort(ui, r1)
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178 writerevs(ui, r1, r2, order, tr)
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179 report(ui, datafn, tmpdatafn)
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180 tr.close()
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181 except:
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182 # Abort transaction first, so we truncate the files before
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183 # deleting them.
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184 tr.abort()
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185 if os.path.exists(tmpindexfn):
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186 os.unlink(tmpindexfn)
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187 if os.path.exists(tmpdatafn):
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188 os.unlink(tmpdatafn)
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189 raise
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190 finally:
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191 lock.release()
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192
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193 os.link(indexfn, oldindexfn)
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194 os.link(datafn, olddatafn)
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195 os.rename(tmpindexfn, indexfn)
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196 os.rename(tmpdatafn, datafn)
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197 ui.write('note: old revlog saved in:\n'
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198 ' %s\n'
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199 ' %s\n'
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200 '(You can delete those files when you are satisfied that your\n'
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201 'repository is still sane. '
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202 'Running \'hg verify\' is strongly recommended.)\n'
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203 % (oldindexfn, olddatafn))
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204
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205 cmdtable = {
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206 'shrink': (shrink,
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207 [('', 'revlog', '', 'shrink file')],
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208 'hg shrink [--revlog PATH]')
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209 }