Mercurial > hg
annotate hgext/relink.py @ 10218:750b7a4f01f6 stable
Add support for relinking on Windows.
Test and minor code change by Patrick Mézard <pmezard@gmail.com>
author | Siddharth Agarwal <sid.bugzilla@gmail.com> |
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date | Fri, 08 Jan 2010 18:48:39 +0530 |
parents | 819e6c7085fc |
children | 489b0caf21ed 6521605bc200 |
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, incorporated herein by reference. |
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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 cmdutil, 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 hardlinked |
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18 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 hardlinks |
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21 for any files touched by the new changesets, even if both repositories end |
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22 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 |
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25 any hardlinks, falling back to a complete copy of the source repository. |
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26 |
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27 This command lets you recreate those hardlinks and reclaim that wasted |
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28 space. |
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29 |
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30 This repository will be relinked to share space with ORIGIN, which must be |
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31 on the same local disk. If ORIGIN is omitted, looks for "default-relink", |
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32 then "default", in [paths]. |
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33 |
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34 Do not attempt any read operations on this repository while the command is |
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35 running. (Both repositories will be locked against writes.) |
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36 """ |
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37 if not hasattr(util, 'samefile') or not hasattr(util, 'samedevice'): |
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38 raise util.Abort(_('hardlinks are not supported on this system')) |
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39 src = hg.repository( |
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40 cmdutil.remoteui(repo, opts), |
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41 ui.expandpath(origin or 'default-relink', origin or 'default')) |
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42 if not src.local(): |
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43 raise util.Abort('must specify local origin repository') |
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44 ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path)) |
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45 locallock = repo.lock() |
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46 try: |
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47 remotelock = src.lock() |
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48 try: |
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49 candidates = collect(src.store.path, ui) |
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50 targets = prune(candidates, src.store.path, repo.store.path, ui) |
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51 do_relink(src.store.path, repo.store.path, targets, ui) |
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52 finally: |
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53 remotelock.release() |
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54 finally: |
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55 locallock.release() |
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56 |
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57 def collect(src, ui): |
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58 seplen = len(os.path.sep) |
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59 candidates = [] |
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60 for dirpath, dirnames, filenames in os.walk(src): |
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61 relpath = dirpath[len(src) + seplen:] |
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62 for filename in filenames: |
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63 if not filename[-2:] in ('.d', '.i'): |
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64 continue |
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65 st = os.stat(os.path.join(dirpath, filename)) |
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66 if not stat.S_ISREG(st.st_mode): |
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67 continue |
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68 candidates.append((os.path.join(relpath, filename), st)) |
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69 |
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70 ui.status(_('collected %d candidate storage files\n') % len(candidates)) |
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71 return candidates |
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72 |
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73 def prune(candidates, src, dst, ui): |
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74 def linkfilter(src, dst, st): |
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75 try: |
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76 ts = os.stat(dst) |
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77 except OSError: |
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78 # Destination doesn't have this file? |
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79 return False |
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80 if util.samefile(src, dst): |
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81 return False |
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82 if not util.samedevice(src, dst): |
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83 # No point in continuing |
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84 raise util.Abort( |
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85 _('source and destination are on different devices')) |
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86 if st.st_size != ts.st_size: |
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87 return False |
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88 return st |
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89 |
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90 targets = [] |
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91 for fn, st in candidates: |
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92 srcpath = os.path.join(src, fn) |
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93 tgt = os.path.join(dst, fn) |
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94 ts = linkfilter(srcpath, tgt, st) |
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95 if not ts: |
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96 ui.debug(_('not linkable: %s\n') % fn) |
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97 continue |
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98 targets.append((fn, ts.st_size)) |
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99 |
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100 ui.status(_('pruned down to %d probably relinkable files\n') % len(targets)) |
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101 return targets |
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102 |
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103 def do_relink(src, dst, files, ui): |
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104 def relinkfile(src, dst): |
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105 bak = dst + '.bak' |
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106 os.rename(dst, bak) |
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107 try: |
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108 util.os_link(src, dst) |
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109 except OSError: |
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110 os.rename(bak, dst) |
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111 raise |
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112 os.remove(bak) |
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113 |
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114 CHUNKLEN = 65536 |
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115 relinked = 0 |
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116 savedbytes = 0 |
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117 |
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118 pos = 0 |
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119 total = len(files) |
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120 for f, sz in files: |
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121 pos += 1 |
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122 source = os.path.join(src, f) |
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123 tgt = os.path.join(dst, f) |
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124 # Binary mode, so that read() works correctly, especially on Windows |
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125 sfp = file(source, 'rb') |
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126 dfp = file(tgt, 'rb') |
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127 sin = sfp.read(CHUNKLEN) |
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128 while sin: |
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129 din = dfp.read(CHUNKLEN) |
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130 if sin != din: |
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131 break |
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132 sin = sfp.read(CHUNKLEN) |
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133 sfp.close() |
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134 dfp.close() |
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135 if sin: |
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136 ui.debug(_('not linkable: %s\n') % f) |
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137 continue |
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138 try: |
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139 relinkfile(source, tgt) |
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140 ui.progress(_('relink'), pos, f, _(' files'), total) |
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141 relinked += 1 |
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142 savedbytes += sz |
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143 except OSError, inst: |
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144 ui.warn('%s: %s\n' % (tgt, str(inst))) |
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145 |
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146 ui.status(_('relinked %d files (%d bytes reclaimed)\n') % |
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147 (relinked, savedbytes)) |
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148 |
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149 cmdtable = { |
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150 'relink': ( |
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151 relink, |
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152 [], |
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153 _('[ORIGIN]') |
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154 ) |
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155 } |