Mercurial > public > mercurial-scm > hg-stable

annotate hgext/relink.py @ 11355:9011036ba79d

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relink/progress: Adding progress for collecting stage
author timeless <timeless@gmail.com>
date Thu, 10 Jun 2010 15:35:06 +0200
parents 412a6e749f8d
children 7914628b4751
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Mercurial extension to provide 'hg relink' command
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2 #
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3 # Copyright (C) 2007 Brendan Cully <brendan@kublai.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 """recreates hardlinks between repository clones"""
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9
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10 from mercurial import cmdutil, hg, util
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11 from mercurial.i18n import _
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12 import os, stat
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13
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14 def relink(ui, repo, origin=None, **opts):
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15 """recreate hardlinks between two repositories
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16
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17 When repositories are cloned locally, their data files will be
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18 hardlinked so that they only use the space of a single repository.
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19
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20 Unfortunately, subsequent pulls into either repository will break
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21 hardlinks for any files touched by the new changesets, even if
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22 both repositories end up pulling the same changes.
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23
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24 Similarly, passing --rev to "hg clone" will fail to use any
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25 hardlinks, falling back to a complete copy of the source
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26 repository.
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27
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28 This command lets you recreate those hardlinks and reclaim that
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29 wasted space.
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30
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31 This repository will be relinked to share space with ORIGIN, which
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32 must be on the same local disk. If ORIGIN is omitted, looks for
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33 "default-relink", then "default", in [paths].
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34
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35 Do not attempt any read operations on this repository while the
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36 command is running. (Both repositories will be locked against
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37 writes.)
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38 """
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39 if not hasattr(util, 'samefile') or not hasattr(util, 'samedevice'):
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40 raise util.Abort(_('hardlinks are not supported on this system'))
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41 src = hg.repository(
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42 hg.remoteui(repo, opts),
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43 ui.expandpath(origin or 'default-relink', origin or 'default'))
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44 if not src.local():
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45 raise util.Abort('must specify local origin repository')
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46 ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path))
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47 locallock = repo.lock()
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48 try:
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49 remotelock = src.lock()
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50 try:
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51 candidates = sorted(collect(src, ui))
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52 targets = prune(candidates, src.store.path, repo.store.path, ui)
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53 do_relink(src.store.path, repo.store.path, targets, ui)
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54 finally:
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55 remotelock.release()
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56 finally:
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57 locallock.release()
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58
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59 def collect(src, ui):
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60 seplen = len(os.path.sep)
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61 candidates = []
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62 live = len(src['tip'].manifest())
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63 # Your average repository has some files which were deleted before
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64 # the tip revision. We account for that by assuming that there are
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65 # 3 tracked files for every 2 live files as of the tip version of
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66 # the repository.
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67 #
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68 # mozilla-central as of 2010-06-10 had a ratio of just over 7:5.
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69 total = live * 3 // 2
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70 src = src.store.path
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71 pos = 0
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72 ui.status(_("tip has %d files, estimated total number of files: %s\n")
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73 % (live, total))
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74 for dirpath, dirnames, filenames in os.walk(src):
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75 relpath = dirpath[len(src) + seplen:]
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76 for filename in filenames:
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77 if not filename[-2:] in ('.d', '.i'):
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78 continue
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79 st = os.stat(os.path.join(dirpath, filename))
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80 if not stat.S_ISREG(st.st_mode):
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81 continue
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82 pos += 1
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83 candidates.append((os.path.join(relpath, filename), st))
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84 ui.progress(_('collecting'), pos, filename, _('files'), total)
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85
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86 ui.progress(_('collecting'), None)
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87 ui.status(_('collected %d candidate storage files\n') % len(candidates))
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88 return candidates
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89
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90 def prune(candidates, src, dst, ui):
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91 def linkfilter(src, dst, st):
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92 try:
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93 ts = os.stat(dst)
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94 except OSError:
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95 # Destination doesn't have this file?
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96 return False
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97 if util.samefile(src, dst):
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98 return False
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99 if not util.samedevice(src, dst):
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100 # No point in continuing
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101 raise util.Abort(
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102 _('source and destination are on different devices'))
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103 if st.st_size != ts.st_size:
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104 return False
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105 return st
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106
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107 targets = []
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108 total = len(candidates)
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109 pos = 0
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110 for fn, st in candidates:
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111 pos += 1
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112 srcpath = os.path.join(src, fn)
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113 tgt = os.path.join(dst, fn)
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114 ts = linkfilter(srcpath, tgt, st)
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115 if not ts:
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116 ui.debug(_('not linkable: %s\n') % fn)
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117 continue
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118 targets.append((fn, ts.st_size))
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119 ui.progress(_('pruning'), pos, fn, _(' files'), total)
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120
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121 ui.progress(_('pruning'), None)
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122 ui.status(_('pruned down to %d probably relinkable files\n') % len(targets))
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123 return targets
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124
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125 def do_relink(src, dst, files, ui):
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126 def relinkfile(src, dst):
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127 bak = dst + '.bak'
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128 os.rename(dst, bak)
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129 try:
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130 util.os_link(src, dst)
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131 except OSError:
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132 os.rename(bak, dst)
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133 raise
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134 os.remove(bak)
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135
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136 CHUNKLEN = 65536
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137 relinked = 0
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138 savedbytes = 0
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139
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140 pos = 0
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141 total = len(files)
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142 for f, sz in files:
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143 pos += 1
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144 source = os.path.join(src, f)
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145 tgt = os.path.join(dst, f)
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146 # Binary mode, so that read() works correctly, especially on Windows
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147 sfp = file(source, 'rb')
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148 dfp = file(tgt, 'rb')
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149 sin = sfp.read(CHUNKLEN)
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150 while sin:
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151 din = dfp.read(CHUNKLEN)
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152 if sin != din:
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153 break
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154 sin = sfp.read(CHUNKLEN)
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155 sfp.close()
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156 dfp.close()
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157 if sin:
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158 ui.debug(_('not linkable: %s\n') % f)
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159 continue
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160 try:
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161 relinkfile(source, tgt)
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162 ui.progress(_('relinking'), pos, f, _(' files'), total)
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163 relinked += 1
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164 savedbytes += sz
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165 except OSError, inst:
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166 ui.warn('%s: %s\n' % (tgt, str(inst)))
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167
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168 ui.progress(_('relinking'), None)
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169
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170 ui.status(_('relinked %d files (%d bytes reclaimed)\n') %
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171 (relinked, savedbytes))
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172
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173 cmdtable = {
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174 'relink': (
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175 relink,
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176 [],
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177 _('[ORIGIN]')
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178 )
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179 }