annotate hgext/relink.py @ 40163:9f0ee4a60d65

tests: ensure the python 3 passing test list stays sorted Differential Revision: https://phab.mercurial-scm.org/D4984
author Augie Fackler <augie@google.com>
date Fri, 12 Oct 2018 06:39:32 -0400
parents 36edfbac7281
children c303d65d2e34
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 from __future__ import absolute_import
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10
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11 import os
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12 import stat
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13
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14 from mercurial.i18n import _
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15 from mercurial import (
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16 error,
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17 hg,
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18 registrar,
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19 util,
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20 )
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21 from mercurial.utils import (
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22 stringutil,
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23 )
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24
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25 cmdtable = {}
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26 command = registrar.command(cmdtable)
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27 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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28 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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29 # be specifying the version(s) of Mercurial they are tested with, or
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30 # leave the attribute unspecified.
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31 testedwith = 'ships-with-hg-core'
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32
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33 @command('relink', [], _('[ORIGIN]'))
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34 def relink(ui, repo, origin=None, **opts):
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35 """recreate hardlinks between two repositories
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36
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37 When repositories are cloned locally, their data files will be
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38 hardlinked so that they only use the space of a single repository.
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39
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40 Unfortunately, subsequent pulls into either repository will break
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41 hardlinks for any files touched by the new changesets, even if
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42 both repositories end up pulling the same changes.
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43
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44 Similarly, passing --rev to "hg clone" will fail to use any
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45 hardlinks, falling back to a complete copy of the source
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46 repository.
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47
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48 This command lets you recreate those hardlinks and reclaim that
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49 wasted space.
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50
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51 This repository will be relinked to share space with ORIGIN, which
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52 must be on the same local disk. If ORIGIN is omitted, looks for
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53 "default-relink", then "default", in [paths].
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54
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55 Do not attempt any read operations on this repository while the
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56 command is running. (Both repositories will be locked against
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57 writes.)
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58 """
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59 if (not util.safehasattr(util, 'samefile') or
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60 not util.safehasattr(util, 'samedevice')):
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61 raise error.Abort(_('hardlinks are not supported on this system'))
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62 src = hg.repository(repo.baseui, ui.expandpath(origin or 'default-relink',
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63 origin or 'default'))
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64 ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path))
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65 if repo.root == src.root:
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66 ui.status(_('there is nothing to relink\n'))
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67 return
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68
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69 if not util.samedevice(src.store.path, repo.store.path):
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70 # No point in continuing
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71 raise error.Abort(_('source and destination are on different devices'))
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72
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73 with repo.lock(), src.lock():
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74 candidates = sorted(collect(src, ui))
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75 targets = prune(candidates, src.store.path, repo.store.path, ui)
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76 do_relink(src.store.path, repo.store.path, targets, ui)
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77
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78 def collect(src, ui):
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79 seplen = len(os.path.sep)
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80 candidates = []
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81 live = len(src['tip'].manifest())
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82 # Your average repository has some files which were deleted before
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83 # the tip revision. We account for that by assuming that there are
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84 # 3 tracked files for every 2 live files as of the tip version of
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85 # the repository.
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86 #
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87 # mozilla-central as of 2010-06-10 had a ratio of just over 7:5.
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88 total = live * 3 // 2
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89 src = src.store.path
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90 progress = ui.makeprogress(_('collecting'), unit=_('files'), total=total)
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91 pos = 0
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92 ui.status(_("tip has %d files, estimated total number of files: %d\n")
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93 % (live, total))
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94 for dirpath, dirnames, filenames in os.walk(src):
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95 dirnames.sort()
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96 relpath = dirpath[len(src) + seplen:]
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97 for filename in sorted(filenames):
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98 if filename[-2:] not in ('.d', '.i'):
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99 continue
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100 st = os.stat(os.path.join(dirpath, filename))
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101 if not stat.S_ISREG(st.st_mode):
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102 continue
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103 pos += 1
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104 candidates.append((os.path.join(relpath, filename), st))
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105 progress.update(pos, item=filename)
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106
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107 progress.complete()
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108 ui.status(_('collected %d candidate storage files\n') % len(candidates))
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109 return candidates
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110
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111 def prune(candidates, src, dst, ui):
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112 def linkfilter(src, dst, st):
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113 try:
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114 ts = os.stat(dst)
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115 except OSError:
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116 # Destination doesn't have this file?
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117 return False
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118 if util.samefile(src, dst):
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119 return False
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120 if not util.samedevice(src, dst):
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121 # No point in continuing
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122 raise error.Abort(
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123 _('source and destination are on different devices'))
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124 if st.st_size != ts.st_size:
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125 return False
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126 return st
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127
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128 targets = []
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129 progress = ui.makeprogress(_('pruning'), unit=_('files'),
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130 total=len(candidates))
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131 pos = 0
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132 for fn, st in candidates:
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133 pos += 1
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134 srcpath = os.path.join(src, fn)
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135 tgt = os.path.join(dst, fn)
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136 ts = linkfilter(srcpath, tgt, st)
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137 if not ts:
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138 ui.debug('not linkable: %s\n' % fn)
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139 continue
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140 targets.append((fn, ts.st_size))
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141 progress.update(pos, item=fn)
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142
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143 progress.complete()
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144 ui.status(_('pruned down to %d probably relinkable files\n') % len(targets))
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145 return targets
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146
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147 def do_relink(src, dst, files, ui):
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148 def relinkfile(src, dst):
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149 bak = dst + '.bak'
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150 os.rename(dst, bak)
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151 try:
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152 util.oslink(src, dst)
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153 except OSError:
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154 os.rename(bak, dst)
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155 raise
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156 os.remove(bak)
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157
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158 CHUNKLEN = 65536
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159 relinked = 0
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160 savedbytes = 0
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161
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162 progress = ui.makeprogress(_('relinking'), unit=_('files'),
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163 total=len(files))
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164 pos = 0
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165 for f, sz in files:
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166 pos += 1
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167 source = os.path.join(src, f)
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168 tgt = os.path.join(dst, f)
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169 # Binary mode, so that read() works correctly, especially on Windows
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170 sfp = open(source, 'rb')
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171 dfp = open(tgt, 'rb')
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172 sin = sfp.read(CHUNKLEN)
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173 while sin:
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174 din = dfp.read(CHUNKLEN)
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175 if sin != din:
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176 break
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177 sin = sfp.read(CHUNKLEN)
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178 sfp.close()
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179 dfp.close()
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180 if sin:
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181 ui.debug('not linkable: %s\n' % f)
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182 continue
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183 try:
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184 relinkfile(source, tgt)
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185 progress.update(pos, item=f)
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186 relinked += 1
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187 savedbytes += sz
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188 except OSError as inst:
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189 ui.warn('%s: %s\n' % (tgt, stringutil.forcebytestr(inst)))
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190
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191 progress.complete()
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Augie Fackler <durin42@gmail.com>
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diff changeset
192
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193 ui.status(_('relinked %d files (%s reclaimed)\n') %
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diff changeset
194 (relinked, util.bytecount(savedbytes)))