author | Augie Fackler <augie@google.com> |
Thu, 01 Oct 2015 15:35:10 -0400 | |
changeset 26711 | 0ef0aec56090 |
parent 26587 | 56b2bcea2529 |
child 26778 | a95c975f42e3 |
permissions | -rw-r--r-- |
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# Mercurial extension to provide 'hg relink' command |
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# |
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# Copyright (C) 2007 Brendan Cully <brendan@kublai.com> |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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"""recreates hardlinks between repository clones""" |
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|
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from mercurial import cmdutil, hg, util, error |
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from mercurial.i18n import _ |
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import os, stat |
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|
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cmdtable = {} |
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command = cmdutil.command(cmdtable) |
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# Note for extension authors: ONLY specify testedwith = 'internal' for |
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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# be specifying the version(s) of Mercurial they are tested with, or |
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# leave the attribute unspecified. |
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testedwith = 'internal' |
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|
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@command('relink', [], _('[ORIGIN]')) |
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def relink(ui, repo, origin=None, **opts): |
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"""recreate hardlinks between two repositories |
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When repositories are cloned locally, their data files will be |
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hardlinked so that they only use the space of a single repository. |
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|
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Unfortunately, subsequent pulls into either repository will break |
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hardlinks for any files touched by the new changesets, even if |
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both repositories end up pulling the same changes. |
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Similarly, passing --rev to "hg clone" will fail to use any |
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hardlinks, falling back to a complete copy of the source |
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repository. |
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This command lets you recreate those hardlinks and reclaim that |
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wasted space. |
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This repository will be relinked to share space with ORIGIN, which |
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must be on the same local disk. If ORIGIN is omitted, looks for |
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"default-relink", then "default", in [paths]. |
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Do not attempt any read operations on this repository while the |
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command is running. (Both repositories will be locked against |
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writes.) |
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""" |
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if (not util.safehasattr(util, 'samefile') or |
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not util.safehasattr(util, 'samedevice')): |
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raise error.Abort(_('hardlinks are not supported on this system')) |
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src = hg.repository(repo.baseui, ui.expandpath(origin or 'default-relink', |
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origin or 'default')) |
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ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path)) |
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if repo.root == src.root: |
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ui.status(_('there is nothing to relink\n')) |
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return |
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if not util.samedevice(src.store.path, repo.store.path): |
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# No point in continuing |
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raise error.Abort(_('source and destination are on different devices')) |
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locallock = repo.lock() |
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try: |
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remotelock = src.lock() |
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try: |
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candidates = sorted(collect(src, ui)) |
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targets = prune(candidates, src.store.path, repo.store.path, ui) |
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do_relink(src.store.path, repo.store.path, targets, ui) |
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finally: |
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remotelock.release() |
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finally: |
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locallock.release() |
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def collect(src, ui): |
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seplen = len(os.path.sep) |
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candidates = [] |
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live = len(src['tip'].manifest()) |
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# Your average repository has some files which were deleted before |
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# the tip revision. We account for that by assuming that there are |
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# 3 tracked files for every 2 live files as of the tip version of |
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# the repository. |
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# |
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# mozilla-central as of 2010-06-10 had a ratio of just over 7:5. |
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total = live * 3 // 2 |
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src = src.store.path |
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pos = 0 |
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ui.status(_("tip has %d files, estimated total number of files: %s\n") |
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% (live, total)) |
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for dirpath, dirnames, filenames in os.walk(src): |
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dirnames.sort() |
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relpath = dirpath[len(src) + seplen:] |
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for filename in sorted(filenames): |
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if filename[-2:] not in ('.d', '.i'): |
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continue |
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st = os.stat(os.path.join(dirpath, filename)) |
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if not stat.S_ISREG(st.st_mode): |
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continue |
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pos += 1 |
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candidates.append((os.path.join(relpath, filename), st)) |
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ui.progress(_('collecting'), pos, filename, _('files'), total) |
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ui.progress(_('collecting'), None) |
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ui.status(_('collected %d candidate storage files\n') % len(candidates)) |
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return candidates |
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def prune(candidates, src, dst, ui): |
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def linkfilter(src, dst, st): |
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try: |
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ts = os.stat(dst) |
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except OSError: |
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111 |
# Destination doesn't have this file? |
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112 |
return False |
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113 |
if util.samefile(src, dst): |
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114 |
return False |
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115 |
if not util.samedevice(src, dst): |
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116 |
# No point in continuing |
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117 |
raise error.Abort( |
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118 |
_('source and destination are on different devices')) |
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119 |
if st.st_size != ts.st_size: |
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120 |
return False |
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121 |
return st |
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122 |
|
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123 |
targets = [] |
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124 |
total = len(candidates) |
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125 |
pos = 0 |
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126 |
for fn, st in candidates: |
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pos += 1 |
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128 |
srcpath = os.path.join(src, fn) |
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129 |
tgt = os.path.join(dst, fn) |
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130 |
ts = linkfilter(srcpath, tgt, st) |
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131 |
if not ts: |
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132 |
ui.debug('not linkable: %s\n' % fn) |
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133 |
continue |
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134 |
targets.append((fn, ts.st_size)) |
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135 |
ui.progress(_('pruning'), pos, fn, _('files'), total) |
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136 |
|
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137 |
ui.progress(_('pruning'), None) |
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138 |
ui.status(_('pruned down to %d probably relinkable files\n') % len(targets)) |
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139 |
return targets |
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140 |
|
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141 |
def do_relink(src, dst, files, ui): |
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142 |
def relinkfile(src, dst): |
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143 |
bak = dst + '.bak' |
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144 |
os.rename(dst, bak) |
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145 |
try: |
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146 |
util.oslink(src, dst) |
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147 |
except OSError: |
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148 |
os.rename(bak, dst) |
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149 |
raise |
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150 |
os.remove(bak) |
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151 |
|
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152 |
CHUNKLEN = 65536 |
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153 |
relinked = 0 |
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154 |
savedbytes = 0 |
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155 |
|
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156 |
pos = 0 |
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157 |
total = len(files) |
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158 |
for f, sz in files: |
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159 |
pos += 1 |
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160 |
source = os.path.join(src, f) |
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161 |
tgt = os.path.join(dst, f) |
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162 |
# Binary mode, so that read() works correctly, especially on Windows |
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163 |
sfp = file(source, 'rb') |
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164 |
dfp = file(tgt, 'rb') |
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165 |
sin = sfp.read(CHUNKLEN) |
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|
166 |
while sin: |
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|
167 |
din = dfp.read(CHUNKLEN) |
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|
168 |
if sin != din: |
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|
169 |
break |
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170 |
sin = sfp.read(CHUNKLEN) |
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171 |
sfp.close() |
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|
172 |
dfp.close() |
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|
173 |
if sin: |
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|
174 |
ui.debug('not linkable: %s\n' % f) |
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|
175 |
continue |
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|
176 |
try: |
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|
177 |
relinkfile(source, tgt) |
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178 |
ui.progress(_('relinking'), pos, f, _('files'), total) |
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179 |
relinked += 1 |
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180 |
savedbytes += sz |
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|
181 |
except OSError as inst: |
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182 |
ui.warn('%s: %s\n' % (tgt, str(inst))) |
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183 |
|
10724
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progress: drop extra args for pos=None calls (issue2087)
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|
184 |
ui.progress(_('relinking'), None) |
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Augie Fackler <durin42@gmail.com>
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|
185 |
|
13656
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|
186 |
ui.status(_('relinked %d files (%s reclaimed)\n') % |
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187 |
(relinked, util.bytecount(savedbytes))) |