Mercurial > hg
annotate hgext/relink.py @ 46144:e4f6dae01b3b
cext: shut-up sign compare warnings
Differential Revision: https://phab.mercurial-scm.org/D9627
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Thu, 17 Dec 2020 18:08:25 +0100 |
parents | eef9a2d67051 |
children | b5e7cdb93abc |
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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 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.pycompat import open |
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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 stringutil |
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23 |
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24 cmdtable = {} |
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25 command = registrar.command(cmdtable) |
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26 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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27 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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28 # be specifying the version(s) of Mercurial they are tested with, or |
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29 # leave the attribute unspecified. |
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30 testedwith = b'ships-with-hg-core' |
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31 |
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32 |
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33 @command( |
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34 b'relink', [], _(b'[ORIGIN]'), helpcategory=command.CATEGORY_MAINTENANCE |
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35 ) |
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36 def relink(ui, repo, origin=None, **opts): |
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37 """recreate hardlinks between two repositories |
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38 |
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39 When repositories are cloned locally, their data files will be |
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40 hardlinked so that they only use the space of a single repository. |
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41 |
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42 Unfortunately, subsequent pulls into either repository will break |
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43 hardlinks for any files touched by the new changesets, even if |
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44 both repositories end up pulling the same changes. |
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45 |
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46 Similarly, passing --rev to "hg clone" will fail to use any |
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47 hardlinks, falling back to a complete copy of the source |
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48 repository. |
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49 |
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50 This command lets you recreate those hardlinks and reclaim that |
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51 wasted space. |
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52 |
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53 This repository will be relinked to share space with ORIGIN, which |
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54 must be on the same local disk. If ORIGIN is omitted, looks for |
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55 "default-relink", then "default", in [paths]. |
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56 |
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57 Do not attempt any read operations on this repository while the |
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58 command is running. (Both repositories will be locked against |
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59 writes.) |
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60 """ |
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61 if not util.safehasattr(util, b'samefile') or not util.safehasattr( |
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62 util, b'samedevice' |
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63 ): |
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64 raise error.Abort(_(b'hardlinks are not supported on this system')) |
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65 src = hg.repository( |
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66 repo.baseui, |
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67 ui.expandpath(origin or b'default-relink', origin or b'default'), |
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68 ) |
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69 ui.status(_(b'relinking %s to %s\n') % (src.store.path, repo.store.path)) |
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70 if repo.root == src.root: |
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71 ui.status(_(b'there is nothing to relink\n')) |
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72 return |
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73 |
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74 if not util.samedevice(src.store.path, repo.store.path): |
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75 # No point in continuing |
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76 raise error.Abort(_(b'source and destination are on different devices')) |
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77 |
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78 with repo.lock(), src.lock(): |
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79 candidates = sorted(collect(src, ui)) |
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80 targets = prune(candidates, src.store.path, repo.store.path, ui) |
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81 do_relink(src.store.path, repo.store.path, targets, ui) |
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82 |
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83 |
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84 def collect(src, ui): |
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85 seplen = len(os.path.sep) |
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86 candidates = [] |
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87 live = len(src[b'tip'].manifest()) |
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88 # Your average repository has some files which were deleted before |
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89 # the tip revision. We account for that by assuming that there are |
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90 # 3 tracked files for every 2 live files as of the tip version of |
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91 # the repository. |
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92 # |
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93 # mozilla-central as of 2010-06-10 had a ratio of just over 7:5. |
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94 total = live * 3 // 2 |
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95 src = src.store.path |
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96 progress = ui.makeprogress(_(b'collecting'), unit=_(b'files'), total=total) |
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97 pos = 0 |
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98 ui.status( |
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99 _(b"tip has %d files, estimated total number of files: %d\n") |
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100 % (live, total) |
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101 ) |
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102 for dirpath, dirnames, filenames in os.walk(src): |
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103 dirnames.sort() |
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104 relpath = dirpath[len(src) + seplen :] |
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105 for filename in sorted(filenames): |
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106 if filename[-2:] not in (b'.d', b'.i'): |
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107 continue |
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108 st = os.stat(os.path.join(dirpath, filename)) |
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109 if not stat.S_ISREG(st.st_mode): |
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110 continue |
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111 pos += 1 |
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112 candidates.append((os.path.join(relpath, filename), st)) |
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113 progress.update(pos, item=filename) |
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114 |
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115 progress.complete() |
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116 ui.status(_(b'collected %d candidate storage files\n') % len(candidates)) |
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117 return candidates |
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118 |
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119 |
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120 def prune(candidates, src, dst, ui): |
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121 def linkfilter(src, dst, st): |
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122 try: |
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123 ts = os.stat(dst) |
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124 except OSError: |
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125 # Destination doesn't have this file? |
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126 return False |
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127 if util.samefile(src, dst): |
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128 return False |
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129 if not util.samedevice(src, dst): |
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130 # No point in continuing |
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131 raise error.Abort( |
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132 _(b'source and destination are on different devices') |
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133 ) |
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134 if st.st_size != ts.st_size: |
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135 return False |
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136 return st |
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137 |
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138 targets = [] |
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139 progress = ui.makeprogress( |
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140 _(b'pruning'), unit=_(b'files'), total=len(candidates) |
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141 ) |
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142 pos = 0 |
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143 for fn, st in candidates: |
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144 pos += 1 |
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145 srcpath = os.path.join(src, fn) |
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146 tgt = os.path.join(dst, fn) |
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147 ts = linkfilter(srcpath, tgt, st) |
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148 if not ts: |
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149 ui.debug(b'not linkable: %s\n' % fn) |
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150 continue |
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151 targets.append((fn, ts.st_size)) |
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152 progress.update(pos, item=fn) |
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153 |
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154 progress.complete() |
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155 ui.status( |
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156 _(b'pruned down to %d probably relinkable files\n') % len(targets) |
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157 ) |
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158 return targets |
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159 |
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160 |
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161 def do_relink(src, dst, files, ui): |
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162 def relinkfile(src, dst): |
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163 bak = dst + b'.bak' |
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164 os.rename(dst, bak) |
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165 try: |
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166 util.oslink(src, dst) |
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167 except OSError: |
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168 os.rename(bak, dst) |
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169 raise |
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170 os.remove(bak) |
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171 |
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172 CHUNKLEN = 65536 |
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173 relinked = 0 |
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174 savedbytes = 0 |
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175 |
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176 progress = ui.makeprogress( |
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177 _(b'relinking'), unit=_(b'files'), total=len(files) |
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178 ) |
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179 pos = 0 |
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180 for f, sz in files: |
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181 pos += 1 |
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182 source = os.path.join(src, f) |
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183 tgt = os.path.join(dst, f) |
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184 # Binary mode, so that read() works correctly, especially on Windows |
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185 sfp = open(source, b'rb') |
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186 dfp = open(tgt, b'rb') |
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187 sin = sfp.read(CHUNKLEN) |
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188 while sin: |
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189 din = dfp.read(CHUNKLEN) |
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190 if sin != din: |
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191 break |
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192 sin = sfp.read(CHUNKLEN) |
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193 sfp.close() |
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194 dfp.close() |
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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 ) |