--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/eggs/mercurial-1.7.3-py2.6-linux-x86_64.egg/hgext/relink.py Sat Jan 08 11:20:57 2011 +0530
@@ -0,0 +1,180 @@
+# 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
+
+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 hasattr(util, 'samefile') or not hasattr(util, 'samedevice'):
+ raise util.Abort(_('hardlinks are not supported on this system'))
+ src = hg.repository(
+ hg.remoteui(repo, opts),
+ ui.expandpath(origin or 'default-relink', origin or 'default'))
+ if not src.local():
+ raise util.Abort('must specify local origin repository')
+ ui.status(_('relinking %s to %s\n') % (src.store.path, repo.store.path))
+ 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 not filename[-2:] 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.os_link(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 (%d bytes reclaimed)\n') %
+ (relinked, savedbytes))
+
+cmdtable = {
+ 'relink': (
+ relink,
+ [],
+ _('[ORIGIN]')
+ )
+}