Mercurial > hg
annotate contrib/shrink-revlog.py @ 19126:5c5152af0d15
log-style: add a log style that is default+phase (issue3436)
There is a new style called phases style.
Usage::
hg log --style phases
Why do we need this new style - in what way is it different from or similar to
existing styles?
The new style is default + phases information. With the new phases feature the
users exhibited their desire for a new style that could help them.
Why do this need a new style - couldn't it be folded into an existing style?
The default style and the new one are about the same, the difference is the
phases tag. The users find both styles useful, this means that the both styles
must exist.
author | Iulian Stana <julian.stana@gmail.com> |
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date | Thu, 18 Apr 2013 22:56:57 +0300 |
parents | c2d9ef43ff6c |
children | d6d0f1ed8ebb |
rev | line source |
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1 """reorder a revlog (the manifest by default) to save space |
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2 |
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3 Specifically, this topologically sorts the revisions in the revlog so that |
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4 revisions on the same branch are adjacent as much as possible. This is a |
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5 workaround for the fact that Mercurial computes deltas relative to the |
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6 previous revision rather than relative to a parent revision. |
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7 |
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8 This is *not* safe to run on a changelog. |
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9 """ |
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10 |
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11 # Originally written by Benoit Boissinot <benoit.boissinot at ens-lyon.org> |
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12 # as a patch to rewrite-log. Cleaned up, refactored, documented, and |
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13 # renamed by Greg Ward <greg at gerg.ca>. |
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14 |
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15 # XXX would be nice to have a way to verify the repository after shrinking, |
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16 # e.g. by comparing "before" and "after" states of random changesets |
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17 # (maybe: export before, shrink, export after, diff). |
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18 |
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19 import os, errno |
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20 from mercurial import revlog, transaction, node, util, scmutil |
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21 from mercurial import changegroup |
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22 from mercurial.i18n import _ |
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23 |
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24 |
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25 def postorder(start, edges): |
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26 result = [] |
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27 visit = list(start) |
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28 finished = set() |
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29 |
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30 while visit: |
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31 cur = visit[-1] |
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32 for p in edges[cur]: |
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33 # defend against node.nullrev because it's occasionally |
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34 # possible for a node to have parents (null, something) |
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35 # rather than (something, null) |
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36 if p not in finished and p != node.nullrev: |
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37 visit.append(p) |
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38 break |
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39 else: |
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40 result.append(cur) |
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41 finished.add(cur) |
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42 visit.pop() |
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43 |
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44 return result |
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45 |
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46 def toposort_reversepostorder(ui, rl): |
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47 # postorder of the reverse directed graph |
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48 |
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49 # map rev to list of parent revs (p2 first) |
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50 parents = {} |
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51 heads = set() |
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52 ui.status(_('reading revs\n')) |
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53 try: |
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54 for rev in rl: |
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55 ui.progress(_('reading'), rev, total=len(rl)) |
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56 (p1, p2) = rl.parentrevs(rev) |
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57 if p1 == p2 == node.nullrev: |
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58 parents[rev] = () # root node |
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59 elif p1 == p2 or p2 == node.nullrev: |
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60 parents[rev] = (p1,) # normal node |
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61 else: |
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62 parents[rev] = (p2, p1) # merge node |
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63 heads.add(rev) |
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64 for p in parents[rev]: |
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65 heads.discard(p) |
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66 finally: |
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67 ui.progress(_('reading'), None) |
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68 |
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69 heads = list(heads) |
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70 heads.sort(reverse=True) |
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71 |
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72 ui.status(_('sorting revs\n')) |
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73 return postorder(heads, parents) |
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74 |
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75 def toposort_postorderreverse(ui, rl): |
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76 # reverse-postorder of the reverse directed graph |
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77 |
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78 children = {} |
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79 roots = set() |
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80 ui.status(_('reading revs\n')) |
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81 try: |
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82 for rev in rl: |
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83 ui.progress(_('reading'), rev, total=len(rl)) |
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84 (p1, p2) = rl.parentrevs(rev) |
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85 if p1 == p2 == node.nullrev: |
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86 roots.add(rev) |
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87 children[rev] = [] |
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88 if p1 != node.nullrev: |
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89 children[p1].append(rev) |
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90 if p2 != node.nullrev: |
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91 children[p2].append(rev) |
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92 finally: |
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93 ui.progress(_('reading'), None) |
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94 |
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95 roots = list(roots) |
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96 roots.sort() |
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97 |
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98 ui.status(_('sorting revs\n')) |
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99 result = postorder(roots, children) |
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100 result.reverse() |
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101 return result |
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102 |
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103 def writerevs(ui, r1, r2, order, tr): |
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104 |
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105 ui.status(_('writing revs\n')) |
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106 |
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107 |
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108 order = [r1.node(r) for r in order] |
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109 |
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110 # this is a bit ugly, but it works |
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111 count = [0] |
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112 def lookup(revl, x): |
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113 count[0] += 1 |
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114 ui.progress(_('writing'), count[0], total=len(order)) |
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115 return "%020d" % revl.linkrev(revl.rev(x)) |
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116 |
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117 unlookup = lambda x: int(x, 10) |
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118 |
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119 try: |
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120 bundler = changegroup.bundle10(lookup) |
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121 group = util.chunkbuffer(r1.group(order, bundler)) |
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122 group = changegroup.unbundle10(group, "UN") |
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123 r2.addgroup(group, unlookup, tr) |
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124 finally: |
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125 ui.progress(_('writing'), None) |
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126 |
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127 def report(ui, r1, r2): |
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128 def getsize(r): |
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129 s = 0 |
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130 for fn in (r.indexfile, r.datafile): |
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131 try: |
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132 s += os.stat(fn).st_size |
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133 except OSError, inst: |
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134 if inst.errno != errno.ENOENT: |
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135 raise |
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136 return s |
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137 |
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138 oldsize = float(getsize(r1)) |
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139 newsize = float(getsize(r2)) |
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140 |
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141 # argh: have to pass an int to %d, because a float >= 2^32 |
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142 # blows up under Python 2.5 or earlier |
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143 ui.write(_('old file size: %12d bytes (%6.1f MiB)\n') |
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144 % (int(oldsize), oldsize / 1024 / 1024)) |
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145 ui.write(_('new file size: %12d bytes (%6.1f MiB)\n') |
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146 % (int(newsize), newsize / 1024 / 1024)) |
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147 |
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148 shrink_percent = (oldsize - newsize) / oldsize * 100 |
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149 shrink_factor = oldsize / newsize |
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150 ui.write(_('shrinkage: %.1f%% (%.1fx)\n') |
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151 % (shrink_percent, shrink_factor)) |
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152 |
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153 def shrink(ui, repo, **opts): |
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154 """shrink a revlog by reordering revisions |
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155 |
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156 Rewrites all the entries in some revlog of the current repository |
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157 (by default, the manifest log) to save space. |
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158 |
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159 Different sort algorithms have different performance |
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160 characteristics. Use ``--sort`` to select a sort algorithm so you |
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161 can determine which works best for your data. |
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162 """ |
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163 |
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164 if not repo.local(): |
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165 raise util.Abort(_('not a local repository: %s') % repo.root) |
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166 |
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167 fn = opts.get('revlog') |
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168 if not fn: |
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169 indexfn = repo.sjoin('00manifest.i') |
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170 else: |
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171 if not fn.endswith('.i'): |
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172 raise util.Abort(_('--revlog option must specify the revlog index ' |
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173 'file (*.i), not %s') % opts.get('revlog')) |
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174 |
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175 indexfn = os.path.realpath(fn) |
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176 store = repo.sjoin('') |
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177 if not indexfn.startswith(store): |
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178 raise util.Abort(_('--revlog option must specify a revlog in %s, ' |
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179 'not %s') % (store, indexfn)) |
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180 |
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181 sortname = opts['sort'] |
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182 try: |
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183 toposort = globals()['toposort_' + sortname] |
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184 except KeyError: |
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185 raise util.Abort(_('no such toposort algorithm: %s') % sortname) |
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186 |
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187 if not os.path.exists(indexfn): |
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188 raise util.Abort(_('no such file: %s') % indexfn) |
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189 if '00changelog' in indexfn: |
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190 raise util.Abort(_('shrinking the changelog ' |
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191 'will corrupt your repository')) |
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192 |
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193 ui.write(_('shrinking %s\n') % indexfn) |
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194 tmpindexfn = util.mktempcopy(indexfn, emptyok=True) |
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195 |
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196 r1 = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), indexfn) |
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197 r2 = revlog.revlog(scmutil.opener(os.getcwd(), audit=False), tmpindexfn) |
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198 |
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199 datafn, tmpdatafn = r1.datafile, r2.datafile |
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200 |
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201 oldindexfn = indexfn + '.old' |
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202 olddatafn = datafn + '.old' |
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203 if os.path.exists(oldindexfn) or os.path.exists(olddatafn): |
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204 raise util.Abort(_('one or both of\n' |
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205 ' %s\n' |
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206 ' %s\n' |
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207 'exists from a previous run; please clean up ' |
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208 'before running again') % (oldindexfn, olddatafn)) |
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209 |
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210 # Don't use repo.transaction(), because then things get hairy with |
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211 # paths: some need to be relative to .hg, and some need to be |
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212 # absolute. Doing it this way keeps things simple: everything is an |
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213 # absolute path. |
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214 lock = repo.lock(wait=False) |
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215 tr = transaction.transaction(ui.warn, |
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216 open, |
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217 repo.sjoin('journal')) |
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218 |
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219 def ignoremissing(func): |
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220 def f(*args, **kw): |
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221 try: |
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222 return func(*args, **kw) |
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223 except OSError, inst: |
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224 if inst.errno != errno.ENOENT: |
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225 raise |
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226 return f |
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227 |
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228 try: |
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229 try: |
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230 order = toposort(ui, r1) |
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231 |
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232 suboptimal = 0 |
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233 for i in xrange(1, len(order)): |
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234 parents = [p for p in r1.parentrevs(order[i]) |
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235 if p != node.nullrev] |
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236 if parents and order[i - 1] not in parents: |
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237 suboptimal += 1 |
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238 ui.note(_('%d suboptimal nodes\n') % suboptimal) |
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239 |
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240 writerevs(ui, r1, r2, order, tr) |
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241 report(ui, r1, r2) |
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242 tr.close() |
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243 except: # re-raises |
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244 # Abort transaction first, so we truncate the files before |
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245 # deleting them. |
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246 tr.abort() |
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247 for fn in (tmpindexfn, tmpdatafn): |
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248 ignoremissing(os.unlink)(fn) |
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249 raise |
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250 if not opts.get('dry_run'): |
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251 # racy, both files cannot be renamed atomically |
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252 # copy files |
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253 util.oslink(indexfn, oldindexfn) |
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254 ignoremissing(util.oslink)(datafn, olddatafn) |
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255 |
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256 # rename |
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257 util.rename(tmpindexfn, indexfn) |
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258 try: |
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259 os.chmod(tmpdatafn, os.stat(datafn).st_mode) |
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260 util.rename(tmpdatafn, datafn) |
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261 except OSError, inst: |
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262 if inst.errno != errno.ENOENT: |
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263 raise |
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264 ignoremissing(os.unlink)(datafn) |
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265 else: |
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266 for fn in (tmpindexfn, tmpdatafn): |
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267 ignoremissing(os.unlink)(fn) |
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268 finally: |
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269 lock.release() |
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270 |
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271 if not opts.get('dry_run'): |
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272 ui.write( |
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273 _('note: old revlog saved in:\n' |
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274 ' %s\n' |
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275 ' %s\n' |
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276 '(You can delete those files when you are satisfied that your\n' |
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277 'repository is still sane. ' |
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278 'Running \'hg verify\' is strongly recommended.)\n') |
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279 % (oldindexfn, olddatafn)) |
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280 |
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281 cmdtable = { |
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282 'shrink': (shrink, |
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283 [('', 'revlog', '', |
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284 _('the revlog to shrink (.i)')), |
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285 ('n', 'dry-run', None, |
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286 _('do not shrink, simulate only')), |
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287 ('', 'sort', 'reversepostorder', |
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288 _('name of sort algorithm to use')), |
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289 ], |
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290 _('hg shrink [--revlog PATH]')) |
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291 } |
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292 |
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293 if __name__ == "__main__": |
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294 print "shrink-revlog.py is now an extension (see hg help extensions)" |