Mercurial > public > mercurial-scm > hg-stable

annotate hgext/relink.py @ 53040:cdd7bf612c7b stable tip

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bundle-spec: properly format boolean parameter (issue6960) This was breaking automatic clone bundle generation. This changeset fixes it and add a test to catch it in the future.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Tue, 11 Mar 2025 02:29:42 +0100
parents 4c7194ed56ab
children
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 __future__ import annotations
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11
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12 import os
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13 import stat
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14
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15 from mercurial.i18n import _
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16 from mercurial import (
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17 error,
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18 hg,
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19 registrar,
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20 util,
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21 )
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22 from mercurial.utils import (
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23 stringutil,
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24 urlutil,
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25 )
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26
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27 cmdtable = {}
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28 command = registrar.command(cmdtable)
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29 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
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30 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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31 # be specifying the version(s) of Mercurial they are tested with, or
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32 # leave the attribute unspecified.
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33 testedwith = b'ships-with-hg-core'
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34
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35
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36 @command(
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37 b'relink', [], _(b'[ORIGIN]'), helpcategory=command.CATEGORY_MAINTENANCE
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38 )
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39 def relink(ui, repo, origin=None, **opts):
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40 """recreate hardlinks between two repositories
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41
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42 When repositories are cloned locally, their data files will be
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43 hardlinked so that they only use the space of a single repository.
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44
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45 Unfortunately, subsequent pulls into either repository will break
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46 hardlinks for any files touched by the new changesets, even if
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47 both repositories end up pulling the same changes.
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48
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49 Similarly, passing --rev to "hg clone" will fail to use any
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50 hardlinks, falling back to a complete copy of the source
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51 repository.
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52
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53 This command lets you recreate those hardlinks and reclaim that
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54 wasted space.
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55
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56 This repository will be relinked to share space with ORIGIN, which
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57 must be on the same local disk. If ORIGIN is omitted, looks for
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58 "default-relink", then "default", in [paths].
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59
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60 Do not attempt any read operations on this repository while the
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61 command is running. (Both repositories will be locked against
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62 writes.)
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63 """
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64 if not hasattr(util, 'samefile') or not hasattr(util, 'samedevice'):
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65 raise error.Abort(_(b'hardlinks are not supported on this system'))
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66
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67 if origin is None and b'default-relink' in ui.paths:
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68 origin = b'default-relink'
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69 path = urlutil.get_unique_pull_path_obj(b'relink', ui, origin)
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70 src = hg.repository(repo.baseui, path.loc)
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71 ui.status(_(b'relinking %s to %s\n') % (src.store.path, repo.store.path))
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72 if repo.root == src.root:
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73 ui.status(_(b'there is nothing to relink\n'))
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74 return
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75
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76 if not util.samedevice(src.store.path, repo.store.path):
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77 # No point in continuing
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78 raise error.Abort(_(b'source and destination are on different devices'))
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79
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80 with repo.lock(), src.lock():
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81 candidates = sorted(collect(src, ui))
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82 targets = prune(candidates, src.store.path, repo.store.path, ui)
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83 do_relink(src.store.path, repo.store.path, targets, ui)
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84
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85
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86 def collect(src, ui):
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87 seplen = len(os.path.sep)
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88 candidates = []
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89 live = len(src[b'tip'].manifest())
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90 # Your average repository has some files which were deleted before
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91 # the tip revision. We account for that by assuming that there are
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92 # 3 tracked files for every 2 live files as of the tip version of
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93 # the repository.
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94 #
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95 # mozilla-central as of 2010-06-10 had a ratio of just over 7:5.
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96 total = live * 3 // 2
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97 src = src.store.path
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98 progress = ui.makeprogress(_(b'collecting'), unit=_(b'files'), total=total)
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99 pos = 0
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100 ui.status(
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101 _(b"tip has %d files, estimated total number of files: %d\n")
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102 % (live, total)
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103 )
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104 for dirpath, dirnames, filenames in os.walk(src):
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105 dirnames.sort()
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106 relpath = dirpath[len(src) + seplen :]
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107 for filename in sorted(filenames):
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108 if filename[-2:] not in (b'.d', b'.i'):
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109 continue
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110 st = os.stat(os.path.join(dirpath, filename))
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111 if not stat.S_ISREG(st.st_mode):
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112 continue
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113 pos += 1
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114 candidates.append((os.path.join(relpath, filename), st))
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115 progress.update(pos, item=filename)
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116
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117 progress.complete()
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118 ui.status(_(b'collected %d candidate storage files\n') % len(candidates))
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119 return candidates
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120
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121
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122 def prune(candidates, src, dst, ui):
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123 def linkfilter(src, dst, st):
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124 try:
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125 ts = os.stat(dst)
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126 except OSError:
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127 # Destination doesn't have this file?
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128 return False
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129 if util.samefile(src, dst):
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130 return False
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131 if not util.samedevice(src, dst):
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132 # No point in continuing
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133 raise error.Abort(
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134 _(b'source and destination are on different devices')
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135 )
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136 if st.st_size != ts.st_size:
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137 return False
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138 return st
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139
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140 targets = []
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141 progress = ui.makeprogress(
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142 _(b'pruning'), unit=_(b'files'), total=len(candidates)
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143 )
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144 pos = 0
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145 for fn, st in candidates:
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146 pos += 1
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147 srcpath = os.path.join(src, fn)
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148 tgt = os.path.join(dst, fn)
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149 ts = linkfilter(srcpath, tgt, st)
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150 if not ts:
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151 ui.debug(b'not linkable: %s\n' % fn)
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152 continue
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153 targets.append((fn, ts.st_size))
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154 progress.update(pos, item=fn)
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155
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156 progress.complete()
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157 ui.status(
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158 _(b'pruned down to %d probably relinkable files\n') % len(targets)
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159 )
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160 return targets
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161
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162
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163 def do_relink(src, dst, files, ui):
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164 def relinkfile(src, dst):
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165 bak = dst + b'.bak'
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166 os.rename(dst, bak)
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167 try:
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168 util.oslink(src, dst)
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169 except OSError:
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170 os.rename(bak, dst)
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171 raise
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172 os.remove(bak)
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173
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174 CHUNKLEN = 65536
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175 relinked = 0
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176 savedbytes = 0
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177
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178 progress = ui.makeprogress(
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179 _(b'relinking'), unit=_(b'files'), total=len(files)
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180 )
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181 pos = 0
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182 for f, sz in files:
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183 pos += 1
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184 source = os.path.join(src, f)
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185 tgt = os.path.join(dst, f)
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186 # Binary mode, so that read() works correctly, especially on Windows
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187 with open(source, 'rb') as sfp, open(tgt, 'rb') as dfp:
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188 sin = sfp.read(CHUNKLEN)
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189 while sin:
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190 din = dfp.read(CHUNKLEN)
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191 if sin != din:
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192 break
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193 sin = sfp.read(CHUNKLEN)
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194
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195 if sin:
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196 ui.debug(b'not linkable: %s\n' % f)
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197 continue
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198 try:
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199 relinkfile(source, tgt)
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200 progress.update(pos, item=f)
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201 relinked += 1
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202 savedbytes += sz
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203 except OSError as inst:
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204 ui.warn(b'%s: %s\n' % (tgt, stringutil.forcebytestr(inst)))
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205
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206 progress.complete()
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207
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208 ui.status(
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209 _(b'relinked %d files (%s reclaimed)\n')
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210 % (relinked, util.bytecount(savedbytes))
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211 )