Mercurial > hg
annotate contrib/shrink-revlog.py @ 10215:9d79b8f58bea
contrib: turn shrink-revlog.py into an extension
author | Dirkjan Ochtman <dirkjan@ochtman.nl> |
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date | Thu, 07 Jan 2010 16:06:12 +0100 |
parents | 8111f9988c9d |
children | 843f6ee6d14b |
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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 } |