Mercurial > hg
annotate hgext/relink.py @ 14659:4392594746f6
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author | Matt Mackall <mpm@selenic.com> |
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date | Fri, 17 Jun 2011 15:36:56 -0500 |
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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 from mercurial import hg, util |
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11 from mercurial.i18n import _ |
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12 import os, stat |
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13 |
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14 def relink(ui, repo, origin=None, **opts): |
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15 """recreate hardlinks between two repositories |
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16 |
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17 When repositories are cloned locally, their data files will be |
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18 hardlinked so that they only use the space of a single repository. |
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19 |
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20 Unfortunately, subsequent pulls into either repository will break |
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21 hardlinks for any files touched by the new changesets, even if |
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22 both repositories end up pulling the same changes. |
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23 |
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24 Similarly, passing --rev to "hg clone" will fail to use any |
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25 hardlinks, falling back to a complete copy of the source |
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26 repository. |
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27 |
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28 This command lets you recreate those hardlinks and reclaim that |
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29 wasted space. |
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30 |
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31 This repository will be relinked to share space with ORIGIN, which |
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32 must be on the same local disk. If ORIGIN is omitted, looks for |
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33 "default-relink", then "default", in [paths]. |
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34 |
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35 Do not attempt any read operations on this repository while the |
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36 command is running. (Both repositories will be locked against |
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37 writes.) |
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38 """ |
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39 if not hasattr(util, 'samefile') or not hasattr(util, 'samedevice'): |
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40 raise util.Abort(_('hardlinks are not supported on this system')) |
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41 src = hg.repository(ui, ui.expandpath(origin or 'default-relink', |
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42 origin or 'default')) |
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43 if not src.local(): |
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44 raise util.Abort(_('must specify local origin repository')) |
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45 ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path)) |
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46 if repo.root == src.root: |
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47 ui.status(_('there is nothing to relink\n')) |
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48 return |
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49 |
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50 locallock = repo.lock() |
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51 try: |
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52 remotelock = src.lock() |
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53 try: |
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54 candidates = sorted(collect(src, ui)) |
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55 targets = prune(candidates, src.store.path, repo.store.path, ui) |
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56 do_relink(src.store.path, repo.store.path, targets, ui) |
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57 finally: |
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58 remotelock.release() |
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59 finally: |
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60 locallock.release() |
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61 |
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62 def collect(src, ui): |
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63 seplen = len(os.path.sep) |
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64 candidates = [] |
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65 live = len(src['tip'].manifest()) |
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66 # Your average repository has some files which were deleted before |
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67 # the tip revision. We account for that by assuming that there are |
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68 # 3 tracked files for every 2 live files as of the tip version of |
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69 # the repository. |
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70 # |
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71 # mozilla-central as of 2010-06-10 had a ratio of just over 7:5. |
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72 total = live * 3 // 2 |
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73 src = src.store.path |
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74 pos = 0 |
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75 ui.status(_("tip has %d files, estimated total number of files: %s\n") |
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76 % (live, total)) |
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77 for dirpath, dirnames, filenames in os.walk(src): |
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78 dirnames.sort() |
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79 relpath = dirpath[len(src) + seplen:] |
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80 for filename in sorted(filenames): |
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81 if not filename[-2:] in ('.d', '.i'): |
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82 continue |
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83 st = os.stat(os.path.join(dirpath, filename)) |
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84 if not stat.S_ISREG(st.st_mode): |
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85 continue |
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86 pos += 1 |
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87 candidates.append((os.path.join(relpath, filename), st)) |
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88 ui.progress(_('collecting'), pos, filename, _('files'), total) |
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89 |
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90 ui.progress(_('collecting'), None) |
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91 ui.status(_('collected %d candidate storage files\n') % len(candidates)) |
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92 return candidates |
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93 |
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94 def prune(candidates, src, dst, ui): |
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95 def linkfilter(src, dst, st): |
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96 try: |
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97 ts = os.stat(dst) |
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98 except OSError: |
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99 # Destination doesn't have this file? |
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100 return False |
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101 if util.samefile(src, dst): |
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102 return False |
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103 if not util.samedevice(src, dst): |
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104 # No point in continuing |
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105 raise util.Abort( |
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106 _('source and destination are on different devices')) |
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107 if st.st_size != ts.st_size: |
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108 return False |
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109 return st |
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110 |
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111 targets = [] |
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112 total = len(candidates) |
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113 pos = 0 |
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114 for fn, st in candidates: |
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115 pos += 1 |
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116 srcpath = os.path.join(src, fn) |
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117 tgt = os.path.join(dst, fn) |
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118 ts = linkfilter(srcpath, tgt, st) |
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119 if not ts: |
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120 ui.debug(_('not linkable: %s\n') % fn) |
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121 continue |
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122 targets.append((fn, ts.st_size)) |
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123 ui.progress(_('pruning'), pos, fn, _('files'), total) |
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124 |
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125 ui.progress(_('pruning'), None) |
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126 ui.status(_('pruned down to %d probably relinkable files\n') % len(targets)) |
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127 return targets |
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128 |
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129 def do_relink(src, dst, files, ui): |
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130 def relinkfile(src, dst): |
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131 bak = dst + '.bak' |
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132 os.rename(dst, bak) |
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133 try: |
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134 util.oslink(src, dst) |
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135 except OSError: |
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136 os.rename(bak, dst) |
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137 raise |
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138 os.remove(bak) |
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139 |
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140 CHUNKLEN = 65536 |
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141 relinked = 0 |
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142 savedbytes = 0 |
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143 |
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144 pos = 0 |
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145 total = len(files) |
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146 for f, sz in files: |
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147 pos += 1 |
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148 source = os.path.join(src, f) |
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149 tgt = os.path.join(dst, f) |
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150 # Binary mode, so that read() works correctly, especially on Windows |
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151 sfp = file(source, 'rb') |
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152 dfp = file(tgt, 'rb') |
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153 sin = sfp.read(CHUNKLEN) |
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154 while sin: |
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155 din = dfp.read(CHUNKLEN) |
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156 if sin != din: |
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157 break |
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158 sin = sfp.read(CHUNKLEN) |
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159 sfp.close() |
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160 dfp.close() |
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161 if sin: |
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162 ui.debug(_('not linkable: %s\n') % f) |
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163 continue |
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164 try: |
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165 relinkfile(source, tgt) |
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166 ui.progress(_('relinking'), pos, f, _('files'), total) |
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167 relinked += 1 |
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168 savedbytes += sz |
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169 except OSError, inst: |
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170 ui.warn('%s: %s\n' % (tgt, str(inst))) |
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171 |
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172 ui.progress(_('relinking'), None) |
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173 |
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174 ui.status(_('relinked %d files (%s reclaimed)\n') % |
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175 (relinked, util.bytecount(savedbytes))) |
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176 |
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177 cmdtable = { |
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178 'relink': ( |
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179 relink, |
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180 [], |
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181 _('[ORIGIN]') |
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182 ) |
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183 } |