localrepo: omit ".hgsubstate" also from "added" files
Before this patch, "localrepository.commit()" omits ".hgsubstate" from
"modified" (changes[0]) and "removed" (changes[2]) file list before
checking subrepositories, but leaves one in "added" (changes[1]) as it
is.
Then, "localrepository.commit()" adds ".hgsubstate" into "modified" or
"removed" list forcibly, according to subrepository statuses.
If "added" contains ".hgsubstate", the committed context will contain
two ".hgsubstate" in its "files": one from "added" (not omitted one),
and another from "modified" or "removed" (newly added one).
How many times ".hgsubstate" appears in "files" changes node hash,
even though revision content is same, because node hash calculation
uses the specified "files" directly (without duplication check or so).
This means that node hash of committed revision changes according to
existence of ".hgsubstate" in "added" at "localrepository.commit()".
".hgsubstate" is treated as "added", not only in accidental cases, but
also in the case of "qpush" for the patch adding ".hgsubstate".
This patch omits ".hgsubstate" also from "added" files before checking
subrepositories. This patch also omits ".hgsubstate" exclusion in
"qnew"/"qrefresh" introduced by changeset d666da075b91, because this
patch makes them meaningless.
"hg parents --template '{files}\n'" newly added to "test-mq-subrepo.t"
enhances checking unexpected multiple appearances of ".hgsubstate" in
"files" of created/refreshed MQ revisions.
# Mercurial extension to provide 'hg relink' command
#
# Copyright (C) 2007 Brendan Cully <brendan@kublai.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""recreates hardlinks between repository clones"""
from mercurial import hg, util
from mercurial.i18n import _
import os, stat
testedwith = 'internal'
def relink(ui, repo, origin=None, **opts):
"""recreate hardlinks between two repositories
When repositories are cloned locally, their data files will be
hardlinked so that they only use the space of a single repository.
Unfortunately, subsequent pulls into either repository will break
hardlinks for any files touched by the new changesets, even if
both repositories end up pulling the same changes.
Similarly, passing --rev to "hg clone" will fail to use any
hardlinks, falling back to a complete copy of the source
repository.
This command lets you recreate those hardlinks and reclaim that
wasted space.
This repository will be relinked to share space with ORIGIN, which
must be on the same local disk. If ORIGIN is omitted, looks for
"default-relink", then "default", in [paths].
Do not attempt any read operations on this repository while the
command is running. (Both repositories will be locked against
writes.)
"""
if (not util.safehasattr(util, 'samefile') or
not util.safehasattr(util, 'samedevice')):
raise util.Abort(_('hardlinks are not supported on this system'))
src = hg.repository(repo.baseui, ui.expandpath(origin or 'default-relink',
origin or 'default'))
ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path))
if repo.root == src.root:
ui.status(_('there is nothing to relink\n'))
return
if not util.samedevice(src.store.path, repo.store.path):
# No point in continuing
raise util.Abort(_('source and destination are on different devices'))
locallock = repo.lock()
try:
remotelock = src.lock()
try:
candidates = sorted(collect(src, ui))
targets = prune(candidates, src.store.path, repo.store.path, ui)
do_relink(src.store.path, repo.store.path, targets, ui)
finally:
remotelock.release()
finally:
locallock.release()
def collect(src, ui):
seplen = len(os.path.sep)
candidates = []
live = len(src['tip'].manifest())
# Your average repository has some files which were deleted before
# the tip revision. We account for that by assuming that there are
# 3 tracked files for every 2 live files as of the tip version of
# the repository.
#
# mozilla-central as of 2010-06-10 had a ratio of just over 7:5.
total = live * 3 // 2
src = src.store.path
pos = 0
ui.status(_("tip has %d files, estimated total number of files: %s\n")
% (live, total))
for dirpath, dirnames, filenames in os.walk(src):
dirnames.sort()
relpath = dirpath[len(src) + seplen:]
for filename in sorted(filenames):
if filename[-2:] not in ('.d', '.i'):
continue
st = os.stat(os.path.join(dirpath, filename))
if not stat.S_ISREG(st.st_mode):
continue
pos += 1
candidates.append((os.path.join(relpath, filename), st))
ui.progress(_('collecting'), pos, filename, _('files'), total)
ui.progress(_('collecting'), None)
ui.status(_('collected %d candidate storage files\n') % len(candidates))
return candidates
def prune(candidates, src, dst, ui):
def linkfilter(src, dst, st):
try:
ts = os.stat(dst)
except OSError:
# Destination doesn't have this file?
return False
if util.samefile(src, dst):
return False
if not util.samedevice(src, dst):
# No point in continuing
raise util.Abort(
_('source and destination are on different devices'))
if st.st_size != ts.st_size:
return False
return st
targets = []
total = len(candidates)
pos = 0
for fn, st in candidates:
pos += 1
srcpath = os.path.join(src, fn)
tgt = os.path.join(dst, fn)
ts = linkfilter(srcpath, tgt, st)
if not ts:
ui.debug('not linkable: %s\n' % fn)
continue
targets.append((fn, ts.st_size))
ui.progress(_('pruning'), pos, fn, _('files'), total)
ui.progress(_('pruning'), None)
ui.status(_('pruned down to %d probably relinkable files\n') % len(targets))
return targets
def do_relink(src, dst, files, ui):
def relinkfile(src, dst):
bak = dst + '.bak'
os.rename(dst, bak)
try:
util.oslink(src, dst)
except OSError:
os.rename(bak, dst)
raise
os.remove(bak)
CHUNKLEN = 65536
relinked = 0
savedbytes = 0
pos = 0
total = len(files)
for f, sz in files:
pos += 1
source = os.path.join(src, f)
tgt = os.path.join(dst, f)
# Binary mode, so that read() works correctly, especially on Windows
sfp = file(source, 'rb')
dfp = file(tgt, 'rb')
sin = sfp.read(CHUNKLEN)
while sin:
din = dfp.read(CHUNKLEN)
if sin != din:
break
sin = sfp.read(CHUNKLEN)
sfp.close()
dfp.close()
if sin:
ui.debug('not linkable: %s\n' % f)
continue
try:
relinkfile(source, tgt)
ui.progress(_('relinking'), pos, f, _('files'), total)
relinked += 1
savedbytes += sz
except OSError, inst:
ui.warn('%s: %s\n' % (tgt, str(inst)))
ui.progress(_('relinking'), None)
ui.status(_('relinked %d files (%s reclaimed)\n') %
(relinked, util.bytecount(savedbytes)))
cmdtable = {
'relink': (
relink,
[],
_('[ORIGIN]')
)
}