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annotate contrib/shrink-revlog.py @ 10508:cc35ad583e66 stable

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shrink-revlog: add strings for translation / import _ before using it
author Benoit Boissinot <benoit.boissinot@ens-lyon.org>
date Fri, 19 Feb 2010 02:07:13 +0100
parents 45734b51c99b
children 3e7e789d9494
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 (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 sys, os, tempfile
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23 import optparse
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24 from mercurial import ui as ui_, hg, revlog, transaction, node, util
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25 from mercurial import changegroup
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26 from mercurial.i18n import _
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27
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28 def toposort(ui, rl):
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29
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30 children = {}
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31 root = []
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32 # build children and roots
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33 ui.status(_('reading revs\n'))
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34 try:
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35 for i in rl:
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36 ui.progress(_('reading'), i, total=len(rl))
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37 children[i] = []
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38 parents = [p for p in rl.parentrevs(i) if p != node.nullrev]
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39 # in case of duplicate parents
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40 if len(parents) == 2 and parents[0] == parents[1]:
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41 del parents[1]
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42 for p in parents:
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43 assert p in children
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44 children[p].append(i)
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45
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46 if len(parents) == 0:
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47 root.append(i)
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48 finally:
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49 ui.progress(_('reading'), None, total=len(rl))
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50
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51 # XXX this is a reimplementation of the 'branchsort' topo sort
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52 # algorithm in hgext.convert.convcmd... would be nice not to duplicate
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53 # the algorithm
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54 ui.status(_('sorting revs\n'))
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55 visit = root
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56 ret = []
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57 while visit:
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58 i = visit.pop(0)
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59 ret.append(i)
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60 if i not in children:
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61 # This only happens if some node's p1 == p2, which can
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62 # happen in the manifest in certain circumstances.
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63 continue
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64 next = []
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65 for c in children.pop(i):
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66 parents_unseen = [p for p in rl.parentrevs(c)
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67 if p != node.nullrev and p in children]
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68 if len(parents_unseen) == 0:
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69 next.append(c)
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70 visit = next + visit
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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.status(_('writing revs\n'))
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76
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77 count = [0]
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78 def progress(*args):
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79 ui.progress(_('writing'), count[0], total=len(order))
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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.progress(_('writing'), None, len(order))
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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')
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109 % (shrink_percent, shrink_factor))
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110
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111 def shrink(ui, repo, **opts):
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112 """
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113 Shrink revlog by re-ordering revisions. Will operate on manifest for
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114 the given repository if no other revlog is specified."""
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115
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116 # Unbuffer stdout for nice progress output.
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117 sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
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118
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119 if not repo.local():
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120 raise util.Abort(_('not a local repository: %s') % repo.root)
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121
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122 fn = opts.get('revlog')
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123 if not fn:
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124 indexfn = repo.sjoin('00manifest.i')
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125 else:
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126 if not fn.endswith('.i'):
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127 raise util.Abort(_('--revlog option must specify the revlog index '
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128 'file (*.i), not %s') % opts.get('revlog'))
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129
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130 indexfn = os.path.realpath(fn)
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131 store = repo.sjoin('')
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132 if not indexfn.startswith(store):
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133 raise util.Abort(_('--revlog option must specify a revlog in %s, '
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134 'not %s') % (store, indexfn))
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135
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136 datafn = indexfn[:-2] + '.d'
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137 if not os.path.exists(indexfn):
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138 raise util.Abort(_('no such file: %s') % indexfn)
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139 if '00changelog' in indexfn:
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140 raise util.Abort(_('shrinking the changelog '
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141 'will corrupt your repository'))
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142 if not os.path.exists(datafn):
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143 # This is just a lazy shortcut because I can't be bothered to
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144 # handle all the special cases that entail from no .d file.
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145 raise util.Abort(_('%s does not exist: revlog not big enough '
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146 'to be worth shrinking') % datafn)
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147
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148 oldindexfn = indexfn + '.old'
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149 olddatafn = datafn + '.old'
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150 if os.path.exists(oldindexfn) or os.path.exists(olddatafn):
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151 raise util.Abort(_('one or both of\n'
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152 ' %s\n'
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153 ' %s\n'
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154 'exists from a previous run; please clean up '
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155 'before running again') % (oldindexfn, olddatafn))
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156
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157 ui.write(_('shrinking %s\n') % indexfn)
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158 prefix = os.path.basename(indexfn)[:-1]
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159 (tmpfd, tmpindexfn) = tempfile.mkstemp(dir=os.path.dirname(indexfn),
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160 prefix=prefix,
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161 suffix='.i')
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162 tmpdatafn = tmpindexfn[:-2] + '.d'
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163 os.close(tmpfd)
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164
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165 r1 = revlog.revlog(util.opener(os.getcwd(), audit=False), indexfn)
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166 r2 = revlog.revlog(util.opener(os.getcwd(), audit=False), tmpindexfn)
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167
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168 # Don't use repo.transaction(), because then things get hairy with
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169 # paths: some need to be relative to .hg, and some need to be
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170 # absolute. Doing it this way keeps things simple: everything is an
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171 # absolute path.
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172 lock = repo.lock(wait=False)
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173 tr = transaction.transaction(ui.warn,
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174 open,
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175 repo.sjoin('journal'))
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176
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177 try:
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178 try:
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179 order = toposort(ui, r1)
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180 writerevs(ui, r1, r2, order, tr)
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181 report(ui, datafn, tmpdatafn)
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182 tr.close()
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183 except:
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184 # Abort transaction first, so we truncate the files before
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185 # deleting them.
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186 tr.abort()
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187 if os.path.exists(tmpindexfn):
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188 os.unlink(tmpindexfn)
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189 if os.path.exists(tmpdatafn):
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190 os.unlink(tmpdatafn)
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191 raise
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192 if not opts.get('dry_run'):
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193 # Racy since both files cannot be renamed atomically
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194 util.os_link(indexfn, oldindexfn)
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195 util.os_link(datafn, olddatafn)
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196 util.rename(tmpindexfn, indexfn)
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197 util.rename(tmpdatafn, datafn)
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198 else:
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199 os.unlink(tmpindexfn)
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200 os.unlink(tmpdatafn)
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201 finally:
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202 lock.release()
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203
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204 if not opts.get('dry_run'):
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205 ui.write(_('note: old revlog saved in:\n'
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206 ' %s\n'
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207 ' %s\n'
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208 '(You can delete those files when you are satisfied that your\n'
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209 'repository is still sane. '
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210 'Running \'hg verify\' is strongly recommended.)\n')
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211 % (oldindexfn, olddatafn))
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212
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213 cmdtable = {
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diff changeset
214 'shrink': (shrink,
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215 [('', 'revlog', '', _('index (.i) file of the revlog to shrink')),
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216 ('n', 'dry-run', None, _('do not shrink, simulate only')),
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217 ],
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218 _('hg shrink [--revlog PATH]'))
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219 }
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220
49a8625b8cac shrink-revlog: help/doc tweaks
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parents: 10234
diff changeset
221 if __name__ == "__main__":
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Matt Mackall <mpm@selenic.com>
parents: 10241
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222 print "shrink-revlog.py is now an extension (see hg help extensions)"