hgext/relink.py
author Jun Wu <quark@fb.com>
Mon, 28 Aug 2017 13:43:25 -0700
changeset 34038 bc2535238de2
parent 32337 46ba2cdda476
child 36394 4bc983568016
permissions -rw-r--r--
import-checker: allow relative import a module being checked This would make the checker more friendly for 3rd-party code. For example, In remotefilelog/x.py, it may have: from . import shallowutils That could trigger "relative import of stdlib module" if "remotefilelog" was installed in the system. If the module being checked conflicts with the system module, it makes sense to not treat that module as system module. This patch makes it so. Differential Revision: https://phab.mercurial-scm.org/D552
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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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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]'))
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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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   130
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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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   159
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    CHUNKLEN = 65536
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    relinked = 0
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    savedbytes = 0
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   163
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   164
    pos = 0
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    total = len(files)
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   166
    for f, sz in files:
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   167
        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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   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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                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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diff changeset
   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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328739ea70c3 global: mass rewrite to use modern exception syntax
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diff changeset
   189
        except OSError as inst:
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819e6c7085fc relink: do not translate format string with no text
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   190
            ui.warn('%s: %s\n' % (tgt, str(inst)))
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parents:
diff changeset
   191
10724
cb0a7faa29ea progress: drop extra args for pos=None calls (issue2087)
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diff changeset
   192
    ui.progress(_('relinking'), None)
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93b5abcf5101 relink: properly use the progress API
Augie Fackler <durin42@gmail.com>
parents: 10264
diff changeset
   193
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0e200e1801f4 relink: format reclaimed byte count nicely
Martin Geisler <mg@lazybytes.net>
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diff changeset
   194
    ui.status(_('relinked %d files (%s reclaimed)\n') %
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diff changeset
   195
              (relinked, util.bytecount(savedbytes)))