hgext/relink.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Thu, 02 Feb 2023 17:38:14 +0100
changeset 50615 9e69d9d6f4cf
parent 49730 c6ae90515660
child 50899 d28cc52e2c0f
permissions -rw-r--r--
safehasattr: pass attribute name as string instead of bytes This is a step toward replacing `util.safehasattr` usage with plain `hasattr`. The builtin function behave poorly in Python2 but this was fixed in Python3. These change are done one by one as they tend to have a small odd to trigger puzzling breackage.
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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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import os
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import stat
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from mercurial.i18n import _
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from mercurial.pycompat import open
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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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    urlutil,
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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 = b'ships-with-hg-core'
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@command(
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    b'relink', [], _(b'[ORIGIN]'), helpcategory=command.CATEGORY_MAINTENANCE
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)
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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, b'samefile') or not util.safehasattr(
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        util, b'samedevice'
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    ):
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        raise error.Abort(_(b'hardlinks are not supported on this system'))
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    if origin is None and b'default-relink' in ui.paths:
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        origin = b'default-relink'
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    path = urlutil.get_unique_pull_path_obj(b'relink', ui, origin)
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    src = hg.repository(repo.baseui, path.loc)
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    ui.status(_(b'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(_(b'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(_(b'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[b'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(_(b'collecting'), unit=_(b'files'), total=total)
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    pos = 0
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    ui.status(
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        _(b"tip has %d files, estimated total number of files: %d\n")
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        % (live, total)
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    )
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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 (b'.d', b'.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(_(b'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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   135
                _(b'source and destination are on different devices')
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   136
            )
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        if st.st_size != ts.st_size:
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   138
            return False
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        return st
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   140
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    targets = []
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    progress = ui.makeprogress(
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        _(b'pruning'), unit=_(b'files'), total=len(candidates)
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   144
    )
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   145
    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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   151
        if not ts:
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            ui.debug(b'not linkable: %s\n' % fn)
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parents:
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            continue
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        targets.append((fn, ts.st_size))
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   155
        progress.update(pos, item=fn)
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parents:
diff changeset
   156
38404
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diff changeset
   157
    progress.complete()
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diff changeset
   158
    ui.status(
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   159
        _(b'pruned down to %d probably relinkable files\n') % len(targets)
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diff changeset
   160
    )
4249
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parents:
diff changeset
   161
    return targets
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parents:
diff changeset
   162
43076
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parents: 40293
diff changeset
   163
9729
aa9ccab5af37 Issue919: add a standard extension to recreate hardlinks between repositories.
Jesse Glick <jesse.glick@sun.com>
parents: 8225
diff changeset
   164
def do_relink(src, dst, files, ui):
4270
29eb88bd5c8d hg-relink: do not compare .d files
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diff changeset
   165
    def relinkfile(src, dst):
43077
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parents: 43076
diff changeset
   166
        bak = dst + b'.bak'
4270
29eb88bd5c8d hg-relink: do not compare .d files
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parents: 4249
diff changeset
   167
        os.rename(dst, bak)
29eb88bd5c8d hg-relink: do not compare .d files
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parents: 4249
diff changeset
   168
        try:
14235
b9e1b041744f rename util.os_link to oslink
Adrian Buehlmann <adrian@cadifra.com>
parents: 13898
diff changeset
   169
            util.oslink(src, dst)
4270
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diff changeset
   170
        except OSError:
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diff changeset
   171
            os.rename(bak, dst)
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diff changeset
   172
            raise
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diff changeset
   173
        os.remove(bak)
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parents: 4249
diff changeset
   174
4249
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parents:
diff changeset
   175
    CHUNKLEN = 65536
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parents:
diff changeset
   176
    relinked = 0
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parents:
diff changeset
   177
    savedbytes = 0
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parents:
diff changeset
   178
43076
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diff changeset
   179
    progress = ui.makeprogress(
43077
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diff changeset
   180
        _(b'relinking'), unit=_(b'files'), total=len(files)
43076
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diff changeset
   181
    )
9729
aa9ccab5af37 Issue919: add a standard extension to recreate hardlinks between repositories.
Jesse Glick <jesse.glick@sun.com>
parents: 8225
diff changeset
   182
    pos = 0
4249
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parents:
diff changeset
   183
    for f, sz in files:
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parents: 8225
diff changeset
   184
        pos += 1
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parents:
diff changeset
   185
        source = os.path.join(src, f)
7663780b55a7 Add hg-relink script to contrib
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parents:
diff changeset
   186
        tgt = os.path.join(dst, f)
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parents: 9790
diff changeset
   187
        # Binary mode, so that read() works correctly, especially on Windows
43077
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diff changeset
   188
        sfp = open(source, b'rb')
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
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diff changeset
   189
        dfp = open(tgt, b'rb')
4249
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parents:
diff changeset
   190
        sin = sfp.read(CHUNKLEN)
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parents:
diff changeset
   191
        while sin:
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parents:
diff changeset
   192
            din = dfp.read(CHUNKLEN)
7663780b55a7 Add hg-relink script to contrib
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parents:
diff changeset
   193
            if sin != din:
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parents:
diff changeset
   194
                break
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parents:
diff changeset
   195
            sin = sfp.read(CHUNKLEN)
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diff changeset
   196
        sfp.close()
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diff changeset
   197
        dfp.close()
4249
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parents:
diff changeset
   198
        if sin:
43077
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diff changeset
   199
            ui.debug(b'not linkable: %s\n' % f)
4249
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parents:
diff changeset
   200
            continue
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parents:
diff changeset
   201
        try:
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29eb88bd5c8d hg-relink: do not compare .d files
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diff changeset
   202
            relinkfile(source, tgt)
38404
398716063c2d relink: use progress helper
Martin von Zweigbergk <martinvonz@google.com>
parents: 37084
diff changeset
   203
            progress.update(pos, item=f)
4249
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parents:
diff changeset
   204
            relinked += 1
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parents:
diff changeset
   205
            savedbytes += sz
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25186
diff changeset
   206
        except OSError as inst:
43077
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Augie Fackler <augie@google.com>
parents: 43076
diff changeset
   207
            ui.warn(b'%s: %s\n' % (tgt, stringutil.forcebytestr(inst)))
4249
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Brendan Cully <brendan@kublai.com>
parents:
diff changeset
   208
38404
398716063c2d relink: use progress helper
Martin von Zweigbergk <martinvonz@google.com>
parents: 37084
diff changeset
   209
    progress.complete()
10424
93b5abcf5101 relink: properly use the progress API
Augie Fackler <durin42@gmail.com>
parents: 10264
diff changeset
   210
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 40293
diff changeset
   211
    ui.status(
43077
687b865b95ad formatting: byteify all mercurial/ and hgext/ string literals
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parents: 43076
diff changeset
   212
        _(b'relinked %d files (%s reclaimed)\n')
43076
2372284d9457 formatting: blacken the codebase
Augie Fackler <augie@google.com>
parents: 40293
diff changeset
   213
        % (relinked, util.bytecount(savedbytes))
2372284d9457 formatting: blacken the codebase
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parents: 40293
diff changeset
   214
    )