Mercurial > hg
annotate hgext/relink.py @ 33453:f6b7617a85bb
phases: add a 'registernew' method to set new phases
This new function will be used by code that adds new changesets. It ajusts the
phase boundary to make sure added changesets are at least in their target
phase (they end up in an higher phase if their parents are in a higher phase).
Having a dedicated function also simplify the phases tracking. All the new
nodes are passed as argument, so we know that all of them needs to have their
new phase registered. We also know that no other nodes will be affected, so no
extra computation are needed.
This function differ from 'retractboundary' where some nodes might change
phase while some other might not. It can also affect nodes not passed as
parameters.
These simplification also apply to the computation itself. For now we use
'_retractboundary' there by convenience, but we may introduces simpler code
later.
While registering new revisions, we still need to check the actual phases of
the added node because it might be higher than the target phase (eg: target is
draft but parent is secret).
We will migrate users over the next changesets.
author | Boris Feld <boris.feld@octobus.net> |
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date | Tue, 11 Jul 2017 03:47:25 +0200 |
parents | 46ba2cdda476 |
children | 4bc983568016 |
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 |
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 |
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22 cmdtable = {} |
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23 command = registrar.command(cmdtable) |
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24 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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25 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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26 # be specifying the version(s) of Mercurial they are tested with, or |
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27 # leave the attribute unspecified. |
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28 testedwith = 'ships-with-hg-core' |
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29 |
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30 @command('relink', [], _('[ORIGIN]')) |
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31 def relink(ui, repo, origin=None, **opts): |
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32 """recreate hardlinks between two repositories |
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33 |
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34 When repositories are cloned locally, their data files will be |
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35 hardlinked so that they only use the space of a single repository. |
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36 |
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37 Unfortunately, subsequent pulls into either repository will break |
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38 hardlinks for any files touched by the new changesets, even if |
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39 both repositories end up pulling the same changes. |
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40 |
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41 Similarly, passing --rev to "hg clone" will fail to use any |
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42 hardlinks, falling back to a complete copy of the source |
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43 repository. |
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44 |
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45 This command lets you recreate those hardlinks and reclaim that |
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46 wasted space. |
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47 |
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48 This repository will be relinked to share space with ORIGIN, which |
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49 must be on the same local disk. If ORIGIN is omitted, looks for |
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50 "default-relink", then "default", in [paths]. |
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51 |
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52 Do not attempt any read operations on this repository while the |
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53 command is running. (Both repositories will be locked against |
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54 writes.) |
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55 """ |
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56 if (not util.safehasattr(util, 'samefile') or |
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57 not util.safehasattr(util, 'samedevice')): |
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58 raise error.Abort(_('hardlinks are not supported on this system')) |
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59 src = hg.repository(repo.baseui, ui.expandpath(origin or 'default-relink', |
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60 origin or 'default')) |
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61 ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path)) |
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62 if repo.root == src.root: |
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63 ui.status(_('there is nothing to relink\n')) |
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64 return |
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65 |
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66 if not util.samedevice(src.store.path, repo.store.path): |
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67 # No point in continuing |
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68 raise error.Abort(_('source and destination are on different devices')) |
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69 |
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70 locallock = repo.lock() |
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71 try: |
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72 remotelock = src.lock() |
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73 try: |
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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 finally: |
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78 remotelock.release() |
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79 finally: |
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80 locallock.release() |
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81 |
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82 def collect(src, ui): |
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83 seplen = len(os.path.sep) |
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84 candidates = [] |
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85 live = len(src['tip'].manifest()) |
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86 # Your average repository has some files which were deleted before |
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87 # the tip revision. We account for that by assuming that there are |
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88 # 3 tracked files for every 2 live files as of the tip version of |
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89 # the repository. |
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90 # |
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91 # mozilla-central as of 2010-06-10 had a ratio of just over 7:5. |
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92 total = live * 3 // 2 |
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93 src = src.store.path |
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94 pos = 0 |
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95 ui.status(_("tip has %d files, estimated total number of files: %d\n") |
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96 % (live, total)) |
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97 for dirpath, dirnames, filenames in os.walk(src): |
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98 dirnames.sort() |
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99 relpath = dirpath[len(src) + seplen:] |
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100 for filename in sorted(filenames): |
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101 if filename[-2:] not in ('.d', '.i'): |
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102 continue |
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103 st = os.stat(os.path.join(dirpath, filename)) |
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104 if not stat.S_ISREG(st.st_mode): |
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105 continue |
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106 pos += 1 |
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107 candidates.append((os.path.join(relpath, filename), st)) |
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108 ui.progress(_('collecting'), pos, filename, _('files'), total) |
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109 |
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110 ui.progress(_('collecting'), None) |
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111 ui.status(_('collected %d candidate storage files\n') % len(candidates)) |
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112 return candidates |
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113 |
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114 def prune(candidates, src, dst, ui): |
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115 def linkfilter(src, dst, st): |
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116 try: |
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117 ts = os.stat(dst) |
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118 except OSError: |
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119 # Destination doesn't have this file? |
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120 return False |
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121 if util.samefile(src, dst): |
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122 return False |
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123 if not util.samedevice(src, dst): |
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124 # No point in continuing |
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125 raise error.Abort( |
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126 _('source and destination are on different devices')) |
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127 if st.st_size != ts.st_size: |
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128 return False |
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129 return st |
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130 |
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131 targets = [] |
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132 total = len(candidates) |
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133 pos = 0 |
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134 for fn, st in candidates: |
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135 pos += 1 |
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136 srcpath = os.path.join(src, fn) |
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137 tgt = os.path.join(dst, fn) |
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138 ts = linkfilter(srcpath, tgt, st) |
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139 if not ts: |
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140 ui.debug('not linkable: %s\n' % fn) |
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141 continue |
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142 targets.append((fn, ts.st_size)) |
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143 ui.progress(_('pruning'), pos, fn, _('files'), total) |
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144 |
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145 ui.progress(_('pruning'), None) |
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146 ui.status(_('pruned down to %d probably relinkable files\n') % len(targets)) |
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147 return targets |
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148 |
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149 def do_relink(src, dst, files, ui): |
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150 def relinkfile(src, dst): |
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151 bak = dst + '.bak' |
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152 os.rename(dst, bak) |
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153 try: |
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154 util.oslink(src, dst) |
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155 except OSError: |
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156 os.rename(bak, dst) |
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157 raise |
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158 os.remove(bak) |
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159 |
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160 CHUNKLEN = 65536 |
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161 relinked = 0 |
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162 savedbytes = 0 |
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163 |
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164 pos = 0 |
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165 total = len(files) |
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166 for f, sz in files: |
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167 pos += 1 |
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168 source = os.path.join(src, f) |
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169 tgt = os.path.join(dst, f) |
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170 # Binary mode, so that read() works correctly, especially on Windows |
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171 sfp = file(source, 'rb') |
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172 dfp = file(tgt, 'rb') |
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173 sin = sfp.read(CHUNKLEN) |
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174 while sin: |
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175 din = dfp.read(CHUNKLEN) |
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176 if sin != din: |
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177 break |
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178 sin = sfp.read(CHUNKLEN) |
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179 sfp.close() |
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180 dfp.close() |
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181 if sin: |
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182 ui.debug('not linkable: %s\n' % f) |
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183 continue |
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184 try: |
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185 relinkfile(source, tgt) |
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186 ui.progress(_('relinking'), pos, f, _('files'), total) |
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187 relinked += 1 |
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188 savedbytes += sz |
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189 except OSError as inst: |
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190 ui.warn('%s: %s\n' % (tgt, str(inst))) |
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191 |
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192 ui.progress(_('relinking'), None) |
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193 |
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194 ui.status(_('relinked %d files (%s reclaimed)\n') % |
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195 (relinked, util.bytecount(savedbytes))) |