Mercurial > hg
annotate hgext/relink.py @ 51630:513597087b89
branching: merge stable into default
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 10 Jun 2024 12:12:56 +0200 |
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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 |
10263 | 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 import os |
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11 import stat |
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12 |
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13 from mercurial.i18n import _ |
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14 from mercurial.pycompat import open |
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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 urlutil, |
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24 ) |
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25 |
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26 cmdtable = {} |
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27 command = registrar.command(cmdtable) |
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28 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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29 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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30 # be specifying the version(s) of Mercurial they are tested with, or |
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31 # leave the attribute unspecified. |
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32 testedwith = b'ships-with-hg-core' |
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33 |
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34 |
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35 @command( |
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36 b'relink', [], _(b'[ORIGIN]'), helpcategory=command.CATEGORY_MAINTENANCE |
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37 ) |
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38 def relink(ui, repo, origin=None, **opts): |
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39 """recreate hardlinks between two repositories |
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40 |
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41 When repositories are cloned locally, their data files will be |
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42 hardlinked so that they only use the space of a single repository. |
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43 |
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44 Unfortunately, subsequent pulls into either repository will break |
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45 hardlinks for any files touched by the new changesets, even if |
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46 both repositories end up pulling the same changes. |
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47 |
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48 Similarly, passing --rev to "hg clone" will fail to use any |
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49 hardlinks, falling back to a complete copy of the source |
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50 repository. |
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51 |
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52 This command lets you recreate those hardlinks and reclaim that |
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53 wasted space. |
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54 |
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55 This repository will be relinked to share space with ORIGIN, which |
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56 must be on the same local disk. If ORIGIN is omitted, looks for |
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57 "default-relink", then "default", in [paths]. |
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58 |
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59 Do not attempt any read operations on this repository while the |
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60 command is running. (Both repositories will be locked against |
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61 writes.) |
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62 """ |
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63 if not hasattr(util, 'samefile') or not hasattr(util, 'samedevice'): |
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64 raise error.Abort(_(b'hardlinks are not supported on this system')) |
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65 |
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66 if origin is None and b'default-relink' in ui.paths: |
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67 origin = b'default-relink' |
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68 path = urlutil.get_unique_pull_path_obj(b'relink', ui, origin) |
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69 src = hg.repository(repo.baseui, path.loc) |
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70 ui.status(_(b'relinking %s to %s\n') % (src.store.path, repo.store.path)) |
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71 if repo.root == src.root: |
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72 ui.status(_(b'there is nothing to relink\n')) |
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73 return |
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74 |
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75 if not util.samedevice(src.store.path, repo.store.path): |
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76 # No point in continuing |
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77 raise error.Abort(_(b'source and destination are on different devices')) |
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78 |
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79 with repo.lock(), src.lock(): |
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80 candidates = sorted(collect(src, ui)) |
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81 targets = prune(candidates, src.store.path, repo.store.path, ui) |
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82 do_relink(src.store.path, repo.store.path, targets, ui) |
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83 |
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84 |
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85 def collect(src, ui): |
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86 seplen = len(os.path.sep) |
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87 candidates = [] |
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88 live = len(src[b'tip'].manifest()) |
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89 # Your average repository has some files which were deleted before |
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90 # the tip revision. We account for that by assuming that there are |
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91 # 3 tracked files for every 2 live files as of the tip version of |
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92 # the repository. |
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93 # |
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94 # mozilla-central as of 2010-06-10 had a ratio of just over 7:5. |
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95 total = live * 3 // 2 |
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96 src = src.store.path |
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97 progress = ui.makeprogress(_(b'collecting'), unit=_(b'files'), total=total) |
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98 pos = 0 |
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99 ui.status( |
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100 _(b"tip has %d files, estimated total number of files: %d\n") |
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101 % (live, total) |
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102 ) |
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103 for dirpath, dirnames, filenames in os.walk(src): |
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104 dirnames.sort() |
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105 relpath = dirpath[len(src) + seplen :] |
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106 for filename in sorted(filenames): |
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107 if filename[-2:] not in (b'.d', b'.i'): |
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108 continue |
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109 st = os.stat(os.path.join(dirpath, filename)) |
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110 if not stat.S_ISREG(st.st_mode): |
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111 continue |
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112 pos += 1 |
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113 candidates.append((os.path.join(relpath, filename), st)) |
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114 progress.update(pos, item=filename) |
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115 |
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116 progress.complete() |
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117 ui.status(_(b'collected %d candidate storage files\n') % len(candidates)) |
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118 return candidates |
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119 |
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120 |
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121 def prune(candidates, src, dst, ui): |
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122 def linkfilter(src, dst, st): |
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123 try: |
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124 ts = os.stat(dst) |
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125 except OSError: |
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126 # Destination doesn't have this file? |
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127 return False |
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128 if util.samefile(src, dst): |
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129 return False |
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130 if not util.samedevice(src, dst): |
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131 # No point in continuing |
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132 raise error.Abort( |
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133 _(b'source and destination are on different devices') |
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134 ) |
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135 if st.st_size != ts.st_size: |
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136 return False |
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137 return st |
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138 |
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139 targets = [] |
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140 progress = ui.makeprogress( |
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141 _(b'pruning'), unit=_(b'files'), total=len(candidates) |
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142 ) |
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143 pos = 0 |
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144 for fn, st in candidates: |
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145 pos += 1 |
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146 srcpath = os.path.join(src, fn) |
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147 tgt = os.path.join(dst, fn) |
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148 ts = linkfilter(srcpath, tgt, st) |
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149 if not ts: |
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150 ui.debug(b'not linkable: %s\n' % fn) |
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151 continue |
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152 targets.append((fn, ts.st_size)) |
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153 progress.update(pos, item=fn) |
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154 |
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155 progress.complete() |
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156 ui.status( |
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157 _(b'pruned down to %d probably relinkable files\n') % len(targets) |
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158 ) |
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159 return targets |
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160 |
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161 |
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162 def do_relink(src, dst, files, ui): |
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163 def relinkfile(src, dst): |
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164 bak = dst + b'.bak' |
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165 os.rename(dst, bak) |
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166 try: |
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167 util.oslink(src, dst) |
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168 except OSError: |
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169 os.rename(bak, dst) |
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170 raise |
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171 os.remove(bak) |
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172 |
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173 CHUNKLEN = 65536 |
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174 relinked = 0 |
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175 savedbytes = 0 |
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176 |
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177 progress = ui.makeprogress( |
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178 _(b'relinking'), unit=_(b'files'), total=len(files) |
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179 ) |
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180 pos = 0 |
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181 for f, sz in files: |
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182 pos += 1 |
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183 source = os.path.join(src, f) |
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184 tgt = os.path.join(dst, f) |
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185 # Binary mode, so that read() works correctly, especially on Windows |
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186 sfp = open(source, b'rb') |
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187 dfp = open(tgt, b'rb') |
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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 sfp.close() |
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195 dfp.close() |
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196 if sin: |
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197 ui.debug(b'not linkable: %s\n' % f) |
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198 continue |
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199 try: |
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200 relinkfile(source, tgt) |
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201 progress.update(pos, item=f) |
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202 relinked += 1 |
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203 savedbytes += sz |
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204 except OSError as inst: |
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205 ui.warn(b'%s: %s\n' % (tgt, stringutil.forcebytestr(inst))) |
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206 |
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207 progress.complete() |
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208 |
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209 ui.status( |
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210 _(b'relinked %d files (%s reclaimed)\n') |
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211 % (relinked, util.bytecount(savedbytes)) |
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212 ) |