Mercurial > hg
annotate hgext/relink.py @ 42042:aaececb4b066
compression: accept level management for zlib compression
We update the zlib related class to be support setting the compression level.
This changeset focus on updating the internal only. A way to configure this
level will be introduced in the next changeset.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 27 Mar 2019 19:34:10 +0100 |
parents | c303d65d2e34 |
children | 2372284d9457 |
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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 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]'), helpcategory=command.CATEGORY_MAINTENANCE) |
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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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192 |
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193 ui.status(_('relinked %d files (%s reclaimed)\n') % |
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194 (relinked, util.bytecount(savedbytes))) |