mirror of
https://github.com/facebook/sapling.git
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4e1c384d0a
I've caught multiple extensions in the wild lying about being 'internal', so it's time to move the goalposts on people. Goalpost moving will continue until third party extensions stop trying to defeat the system.
196 lines
6.4 KiB
Python
196 lines
6.4 KiB
Python
# 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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from __future__ import absolute_import
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import os
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import stat
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from mercurial.i18n import _
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from mercurial import (
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cmdutil,
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error,
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hg,
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util,
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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 = 'ships-with-hg-core' 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 = 'ships-with-hg-core'
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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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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: %d\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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# Destination doesn't have this file?
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return False
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if util.samefile(src, dst):
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return False
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if not util.samedevice(src, dst):
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# No point in continuing
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raise error.Abort(
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_('source and destination are on different devices'))
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if st.st_size != ts.st_size:
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return False
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return st
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targets = []
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total = len(candidates)
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pos = 0
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for fn, st in candidates:
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pos += 1
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srcpath = os.path.join(src, fn)
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tgt = os.path.join(dst, fn)
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ts = linkfilter(srcpath, tgt, st)
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if not ts:
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ui.debug('not linkable: %s\n' % fn)
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continue
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targets.append((fn, ts.st_size))
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ui.progress(_('pruning'), pos, fn, _('files'), total)
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ui.progress(_('pruning'), None)
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ui.status(_('pruned down to %d probably relinkable files\n') % len(targets))
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return targets
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def do_relink(src, dst, files, ui):
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def relinkfile(src, dst):
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bak = dst + '.bak'
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os.rename(dst, bak)
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try:
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util.oslink(src, dst)
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except OSError:
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os.rename(bak, dst)
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raise
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os.remove(bak)
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CHUNKLEN = 65536
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relinked = 0
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savedbytes = 0
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pos = 0
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total = len(files)
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for f, sz in files:
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pos += 1
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source = os.path.join(src, f)
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tgt = os.path.join(dst, f)
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# Binary mode, so that read() works correctly, especially on Windows
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sfp = file(source, 'rb')
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dfp = file(tgt, 'rb')
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sin = sfp.read(CHUNKLEN)
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while sin:
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din = dfp.read(CHUNKLEN)
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if sin != din:
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break
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sin = sfp.read(CHUNKLEN)
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sfp.close()
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dfp.close()
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if sin:
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ui.debug('not linkable: %s\n' % f)
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continue
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try:
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relinkfile(source, tgt)
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ui.progress(_('relinking'), pos, f, _('files'), total)
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relinked += 1
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savedbytes += sz
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except OSError as inst:
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ui.warn('%s: %s\n' % (tgt, str(inst)))
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ui.progress(_('relinking'), None)
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ui.status(_('relinked %d files (%s reclaimed)\n') %
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(relinked, util.bytecount(savedbytes)))
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