hgext/relink.py
author Martin von Zweigbergk <martinvonz@google.com>
Fri, 09 Nov 2018 09:35:05 -0800
changeset 40573 a777ad36b287
parent 40293 c303d65d2e34
child 43076 2372284d9457
permissions -rw-r--r--
remotefilelog: remove unused configs for {data,history}pack version Differential Revision: https://phab.mercurial-scm.org/D5249
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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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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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    error,
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    hg,
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    registrar,
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    util,
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)
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from mercurial.utils import (
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    stringutil,
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)
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cmdtable = {}
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command = registrar.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]'), helpcategory=command.CATEGORY_MAINTENANCE)
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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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    with repo.lock(), src.lock():
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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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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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    progress = ui.makeprogress(_('collecting'), unit=_('files'), total=total)
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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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            progress.update(pos, item=filename)
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    progress.complete()
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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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    progress = ui.makeprogress(_('pruning'), unit=_('files'),
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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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        progress.update(pos, item=fn)
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    progress.complete()
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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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   157
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    CHUNKLEN = 65536
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    relinked = 0
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    savedbytes = 0
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   161
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   162
    progress = ui.makeprogress(_('relinking'), unit=_('files'),
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   163
                               total=len(files))
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   164
    pos = 0
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   165
    for f, sz in files:
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   166
        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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   169
        # Binary mode, so that read() works correctly, especially on Windows
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4bc983568016 py3: replace file() with open()
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   170
        sfp = open(source, 'rb')
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   171
        dfp = open(tgt, 'rb')
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   172
        sin = sfp.read(CHUNKLEN)
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parents:
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   173
        while sin:
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   174
            din = dfp.read(CHUNKLEN)
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   175
            if sin != din:
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   176
                break
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   177
            sin = sfp.read(CHUNKLEN)
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   178
        sfp.close()
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   179
        dfp.close()
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   180
        if sin:
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diff changeset
   181
            ui.debug('not linkable: %s\n' % f)
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   182
            continue
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parents:
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   183
        try:
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diff changeset
   184
            relinkfile(source, tgt)
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diff changeset
   185
            progress.update(pos, item=f)
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parents:
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   186
            relinked += 1
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   187
            savedbytes += sz
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25186
diff changeset
   188
        except OSError as inst:
37084
f0b6fbea00cf stringutil: bulk-replace call sites to point to new module
Yuya Nishihara <yuya@tcha.org>
parents: 36632
diff changeset
   189
            ui.warn('%s: %s\n' % (tgt, stringutil.forcebytestr(inst)))
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parents:
diff changeset
   190
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diff changeset
   191
    progress.complete()
10424
93b5abcf5101 relink: properly use the progress API
Augie Fackler <durin42@gmail.com>
parents: 10264
diff changeset
   192
13656
0e200e1801f4 relink: format reclaimed byte count nicely
Martin Geisler <mg@lazybytes.net>
parents: 12744
diff changeset
   193
    ui.status(_('relinked %d files (%s reclaimed)\n') %
0e200e1801f4 relink: format reclaimed byte count nicely
Martin Geisler <mg@lazybytes.net>
parents: 12744
diff changeset
   194
              (relinked, util.bytecount(savedbytes)))