Mercurial > hg
annotate contrib/shrink-revlog.py @ 10509:3e7e789d9494 stable
shrink-revlog: remove unneeded imports and useless code
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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date | Fri, 19 Feb 2010 02:11:37 +0100 |
parents | cc35ad583e66 |
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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 |
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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 i in rl: |
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35 ui.progress(_('reading'), i, total=len(rl)) |
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36 children[i] = [] |
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37 parents = [p for p in rl.parentrevs(i) 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(i) |
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44 |
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45 if len(parents) == 0: |
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46 root.append(i) |
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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 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 return ret |
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71 |
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72 def writerevs(ui, r1, r2, order, tr): |
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73 |
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74 ui.status(_('writing revs\n')) |
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75 |
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76 count = [0] |
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77 def progress(*args): |
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78 ui.progress(_('writing'), count[0], total=len(order)) |
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79 count[0] += 1 |
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80 |
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81 order = [r1.node(r) for r in order] |
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82 |
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83 # this is a bit ugly, but it works |
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84 lookup = lambda x: "%020d" % r1.linkrev(r1.rev(x)) |
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85 unlookup = lambda x: int(x, 10) |
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86 |
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87 try: |
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88 group = util.chunkbuffer(r1.group(order, lookup, progress)) |
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89 chunkiter = changegroup.chunkiter(group) |
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90 r2.addgroup(chunkiter, unlookup, tr) |
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91 finally: |
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92 ui.progress(_('writing'), None, len(order)) |
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93 |
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94 def report(ui, olddatafn, newdatafn): |
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95 oldsize = float(os.stat(olddatafn).st_size) |
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96 newsize = float(os.stat(newdatafn).st_size) |
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97 |
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98 # argh: have to pass an int to %d, because a float >= 2^32 |
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99 # blows up under Python 2.5 or earlier |
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100 ui.write(_('old file size: %12d bytes (%6.1f MiB)\n') |
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101 % (int(oldsize), oldsize / 1024 / 1024)) |
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102 ui.write(_('new file size: %12d bytes (%6.1f MiB)\n') |
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103 % (int(newsize), newsize / 1024 / 1024)) |
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104 |
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105 shrink_percent = (oldsize - newsize) / oldsize * 100 |
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106 shrink_factor = oldsize / newsize |
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107 ui.write(_('shrinkage: %.1f%% (%.1fx)\n') |
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108 % (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 if not repo.local(): |
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116 raise util.Abort(_('not a local repository: %s') % repo.root) |
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117 |
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118 fn = opts.get('revlog') |
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119 if not fn: |
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120 indexfn = repo.sjoin('00manifest.i') |
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121 else: |
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122 if not fn.endswith('.i'): |
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123 raise util.Abort(_('--revlog option must specify the revlog index ' |
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124 'file (*.i), not %s') % opts.get('revlog')) |
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125 |
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126 indexfn = os.path.realpath(fn) |
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127 store = repo.sjoin('') |
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128 if not indexfn.startswith(store): |
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129 raise util.Abort(_('--revlog option must specify a revlog in %s, ' |
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130 'not %s') % (store, indexfn)) |
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131 |
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132 datafn = indexfn[:-2] + '.d' |
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133 if not os.path.exists(indexfn): |
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134 raise util.Abort(_('no such file: %s') % indexfn) |
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135 if '00changelog' in indexfn: |
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136 raise util.Abort(_('shrinking the changelog ' |
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137 'will corrupt your repository')) |
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138 if not os.path.exists(datafn): |
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139 # This is just a lazy shortcut because I can't be bothered to |
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140 # handle all the special cases that entail from no .d file. |
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141 raise util.Abort(_('%s does not exist: revlog not big enough ' |
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142 'to be worth shrinking') % datafn) |
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143 |
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144 oldindexfn = indexfn + '.old' |
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145 olddatafn = datafn + '.old' |
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146 if os.path.exists(oldindexfn) or os.path.exists(olddatafn): |
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147 raise util.Abort(_('one or both of\n' |
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148 ' %s\n' |
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149 ' %s\n' |
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150 'exists from a previous run; please clean up ' |
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151 'before running again') % (oldindexfn, olddatafn)) |
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152 |
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153 ui.write(_('shrinking %s\n') % indexfn) |
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154 prefix = os.path.basename(indexfn)[:-1] |
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155 (tmpfd, tmpindexfn) = tempfile.mkstemp(dir=os.path.dirname(indexfn), |
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156 prefix=prefix, |
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157 suffix='.i') |
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158 tmpdatafn = tmpindexfn[:-2] + '.d' |
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159 os.close(tmpfd) |
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160 |
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161 r1 = revlog.revlog(util.opener(os.getcwd(), audit=False), indexfn) |
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162 r2 = revlog.revlog(util.opener(os.getcwd(), audit=False), tmpindexfn) |
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163 |
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164 # Don't use repo.transaction(), because then things get hairy with |
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165 # paths: some need to be relative to .hg, and some need to be |
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166 # absolute. Doing it this way keeps things simple: everything is an |
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167 # absolute path. |
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168 lock = repo.lock(wait=False) |
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169 tr = transaction.transaction(ui.warn, |
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170 open, |
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171 repo.sjoin('journal')) |
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172 |
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173 try: |
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174 try: |
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175 order = toposort(ui, r1) |
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176 writerevs(ui, r1, r2, order, tr) |
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177 report(ui, datafn, tmpdatafn) |
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178 tr.close() |
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179 except: |
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180 # Abort transaction first, so we truncate the files before |
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181 # deleting them. |
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182 tr.abort() |
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183 if os.path.exists(tmpindexfn): |
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184 os.unlink(tmpindexfn) |
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185 if os.path.exists(tmpdatafn): |
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186 os.unlink(tmpdatafn) |
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187 raise |
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188 if not opts.get('dry_run'): |
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189 # Racy since both files cannot be renamed atomically |
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190 util.os_link(indexfn, oldindexfn) |
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191 util.os_link(datafn, olddatafn) |
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192 util.rename(tmpindexfn, indexfn) |
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193 util.rename(tmpdatafn, datafn) |
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194 else: |
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195 os.unlink(tmpindexfn) |
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196 os.unlink(tmpdatafn) |
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197 finally: |
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198 lock.release() |
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199 |
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200 if not opts.get('dry_run'): |
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201 ui.write(_('note: old revlog saved in:\n' |
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202 ' %s\n' |
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203 ' %s\n' |
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204 '(You can delete those files when you are satisfied that your\n' |
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205 'repository is still sane. ' |
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206 'Running \'hg verify\' is strongly recommended.)\n') |
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207 % (oldindexfn, olddatafn)) |
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208 |
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209 cmdtable = { |
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210 'shrink': (shrink, |
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211 [('', 'revlog', '', _('index (.i) file of the revlog to shrink')), |
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212 ('n', 'dry-run', None, _('do not shrink, simulate only')), |
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213 ], |
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214 _('hg shrink [--revlog PATH]')) |
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215 } |
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216 |
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217 if __name__ == "__main__": |
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218 print "shrink-revlog.py is now an extension (see hg help extensions)" |