annotate hgext/relink.py @ 10398:ace3cf2bc991

tests: don't just silently strip port numbers
author Mads Kiilerich <mads@kiilerich.com>
date Mon, 08 Feb 2010 02:53:41 +0100
parents d6512b3e9ac0
children 93b5abcf5101
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 cmdutil.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.store.path, 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 for dirpath, dirnames, filenames in os.walk(src):
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63 relpath = dirpath[len(src) + seplen:]
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64 for filename in filenames:
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65 if not filename[-2:] in ('.d', '.i'):
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66 continue
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67 st = os.stat(os.path.join(dirpath, filename))
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68 if not stat.S_ISREG(st.st_mode):
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69 continue
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70 candidates.append((os.path.join(relpath, filename), st))
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71
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72 ui.status(_('collected %d candidate storage files\n') % len(candidates))
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73 return candidates
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74
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75 def prune(candidates, src, dst, ui):
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76 def linkfilter(src, dst, st):
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77 try:
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78 ts = os.stat(dst)
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79 except OSError:
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80 # Destination doesn't have this file?
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81 return False
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82 if util.samefile(src, dst):
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83 return False
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84 if not util.samedevice(src, dst):
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85 # No point in continuing
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86 raise util.Abort(
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87 _('source and destination are on different devices'))
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88 if st.st_size != ts.st_size:
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89 return False
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90 return st
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91
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92 targets = []
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93 for fn, st in candidates:
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94 srcpath = os.path.join(src, fn)
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95 tgt = os.path.join(dst, fn)
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96 ts = linkfilter(srcpath, tgt, st)
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97 if not ts:
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98 ui.debug(_('not linkable: %s\n') % fn)
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99 continue
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100 targets.append((fn, ts.st_size))
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101
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102 ui.status(_('pruned down to %d probably relinkable files\n') % len(targets))
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103 return targets
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104
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105 def do_relink(src, dst, files, ui):
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106 def relinkfile(src, dst):
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107 bak = dst + '.bak'
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108 os.rename(dst, bak)
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109 try:
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110 util.os_link(src, dst)
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111 except OSError:
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112 os.rename(bak, dst)
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113 raise
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114 os.remove(bak)
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115
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116 CHUNKLEN = 65536
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117 relinked = 0
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118 savedbytes = 0
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119
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120 pos = 0
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121 total = len(files)
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122 for f, sz in files:
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123 pos += 1
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124 source = os.path.join(src, f)
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125 tgt = os.path.join(dst, f)
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126 # Binary mode, so that read() works correctly, especially on Windows
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127 sfp = file(source, 'rb')
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128 dfp = file(tgt, 'rb')
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129 sin = sfp.read(CHUNKLEN)
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130 while sin:
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131 din = dfp.read(CHUNKLEN)
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132 if sin != din:
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133 break
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134 sin = sfp.read(CHUNKLEN)
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135 sfp.close()
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136 dfp.close()
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137 if sin:
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138 ui.debug(_('not linkable: %s\n') % f)
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139 continue
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140 try:
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141 relinkfile(source, tgt)
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142 ui.progress(_('relink'), pos, f, _(' files'), total)
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143 relinked += 1
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parents:
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144 savedbytes += sz
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parents:
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145 except OSError, inst:
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Martin Geisler <mg@lazybytes.net>
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146 ui.warn('%s: %s\n' % (tgt, str(inst)))
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147
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148 ui.status(_('relinked %d files (%d bytes reclaimed)\n') %
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149 (relinked, savedbytes))
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150
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151 cmdtable = {
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152 'relink': (
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153 relink,
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154 [],
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Jesse Glick <jesse.glick@sun.com>
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155 _('[ORIGIN]')
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Jesse Glick <jesse.glick@sun.com>
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156 )
aa9ccab5af37 Issue919: add a standard extension to recreate hardlinks between repositories.
Jesse Glick <jesse.glick@sun.com>
parents: 8225
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157 }