mirror of
https://github.com/facebook/sapling.git
synced 2024-10-10 16:57:49 +03:00
49079a5fce
Before this patch, if steps below occurs at "the same time in sec", all of mtime, ctime and size are same between (1) and (3). 1. append data to revlog-style file (and close transaction) 2. discard appended data by truncation of strip 3. append same size but different data to revlog-style file again Therefore, cache validation doesn't work after (3) as expected. To avoid such file stat ambiguity around truncation, this patch opens a file with checkambig=True. This patch also introduces "with" statement style, to ensure immediate invocation of close() after truncation, because closing file is the only trigger to check (and get rid of) file stat ambiguity. This is a part of ExactCacheValidationPlan. https://www.mercurial-scm.org/wiki/ExactCacheValidationPlan
360 lines
12 KiB
Python
360 lines
12 KiB
Python
# repair.py - functions for repository repair for mercurial
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#
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# Copyright 2005, 2006 Chris Mason <mason@suse.com>
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# Copyright 2007 Matt Mackall
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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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from __future__ import absolute_import
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import errno
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import hashlib
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from .i18n import _
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from .node import short
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from . import (
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bundle2,
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changegroup,
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error,
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exchange,
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obsolete,
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util,
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)
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def _bundle(repo, bases, heads, node, suffix, compress=True):
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"""create a bundle with the specified revisions as a backup"""
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cgversion = changegroup.safeversion(repo)
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cg = changegroup.changegroupsubset(repo, bases, heads, 'strip',
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version=cgversion)
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backupdir = "strip-backup"
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vfs = repo.vfs
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if not vfs.isdir(backupdir):
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vfs.mkdir(backupdir)
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# Include a hash of all the nodes in the filename for uniqueness
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allcommits = repo.set('%ln::%ln', bases, heads)
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allhashes = sorted(c.hex() for c in allcommits)
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totalhash = hashlib.sha1(''.join(allhashes)).hexdigest()
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name = "%s/%s-%s-%s.hg" % (backupdir, short(node), totalhash[:8], suffix)
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comp = None
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if cgversion != '01':
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bundletype = "HG20"
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if compress:
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comp = 'BZ'
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elif compress:
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bundletype = "HG10BZ"
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else:
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bundletype = "HG10UN"
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return bundle2.writebundle(repo.ui, cg, name, bundletype, vfs,
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compression=comp)
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def _collectfiles(repo, striprev):
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"""find out the filelogs affected by the strip"""
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files = set()
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for x in xrange(striprev, len(repo)):
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files.update(repo[x].files())
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return sorted(files)
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def _collectbrokencsets(repo, files, striprev):
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"""return the changesets which will be broken by the truncation"""
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s = set()
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def collectone(revlog):
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_, brokenset = revlog.getstrippoint(striprev)
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s.update([revlog.linkrev(r) for r in brokenset])
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collectone(repo.manifest)
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for fname in files:
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collectone(repo.file(fname))
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return s
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def strip(ui, repo, nodelist, backup=True, topic='backup'):
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# This function operates within a transaction of its own, but does
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# not take any lock on the repo.
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# Simple way to maintain backwards compatibility for this
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# argument.
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if backup in ['none', 'strip']:
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backup = False
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repo = repo.unfiltered()
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repo.destroying()
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cl = repo.changelog
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# TODO handle undo of merge sets
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if isinstance(nodelist, str):
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nodelist = [nodelist]
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striplist = [cl.rev(node) for node in nodelist]
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striprev = min(striplist)
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# Some revisions with rev > striprev may not be descendants of striprev.
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# We have to find these revisions and put them in a bundle, so that
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# we can restore them after the truncations.
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# To create the bundle we use repo.changegroupsubset which requires
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# the list of heads and bases of the set of interesting revisions.
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# (head = revision in the set that has no descendant in the set;
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# base = revision in the set that has no ancestor in the set)
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tostrip = set(striplist)
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for rev in striplist:
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for desc in cl.descendants([rev]):
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tostrip.add(desc)
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files = _collectfiles(repo, striprev)
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saverevs = _collectbrokencsets(repo, files, striprev)
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# compute heads
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saveheads = set(saverevs)
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for r in xrange(striprev + 1, len(cl)):
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if r not in tostrip:
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saverevs.add(r)
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saveheads.difference_update(cl.parentrevs(r))
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saveheads.add(r)
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saveheads = [cl.node(r) for r in saveheads]
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# compute base nodes
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if saverevs:
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descendants = set(cl.descendants(saverevs))
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saverevs.difference_update(descendants)
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savebases = [cl.node(r) for r in saverevs]
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stripbases = [cl.node(r) for r in tostrip]
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# For a set s, max(parents(s) - s) is the same as max(heads(::s - s)), but
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# is much faster
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newbmtarget = repo.revs('max(parents(%ld) - (%ld))', tostrip, tostrip)
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if newbmtarget:
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newbmtarget = repo[newbmtarget.first()].node()
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else:
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newbmtarget = '.'
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bm = repo._bookmarks
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updatebm = []
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for m in bm:
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rev = repo[bm[m]].rev()
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if rev in tostrip:
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updatebm.append(m)
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# create a changegroup for all the branches we need to keep
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backupfile = None
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vfs = repo.vfs
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node = nodelist[-1]
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if backup:
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backupfile = _bundle(repo, stripbases, cl.heads(), node, topic)
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repo.ui.status(_("saved backup bundle to %s\n") %
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vfs.join(backupfile))
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repo.ui.log("backupbundle", "saved backup bundle to %s\n",
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vfs.join(backupfile))
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tmpbundlefile = None
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if saveheads:
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# do not compress temporary bundle if we remove it from disk later
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tmpbundlefile = _bundle(repo, savebases, saveheads, node, 'temp',
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compress=False)
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mfst = repo.manifest
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curtr = repo.currenttransaction()
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if curtr is not None:
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del curtr # avoid carrying reference to transaction for nothing
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msg = _('programming error: cannot strip from inside a transaction')
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raise error.Abort(msg, hint=_('contact your extension maintainer'))
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try:
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with repo.transaction("strip") as tr:
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offset = len(tr.entries)
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tr.startgroup()
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cl.strip(striprev, tr)
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mfst.strip(striprev, tr)
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if 'treemanifest' in repo.requirements: # safe but unnecessary
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# otherwise
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for unencoded, encoded, size in repo.store.datafiles():
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if (unencoded.startswith('meta/') and
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unencoded.endswith('00manifest.i')):
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dir = unencoded[5:-12]
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repo.manifest.dirlog(dir).strip(striprev, tr)
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for fn in files:
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repo.file(fn).strip(striprev, tr)
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tr.endgroup()
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for i in xrange(offset, len(tr.entries)):
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file, troffset, ignore = tr.entries[i]
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with repo.svfs(file, 'a', checkambig=True) as fp:
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fp.truncate(troffset)
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if troffset == 0:
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repo.store.markremoved(file)
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if tmpbundlefile:
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ui.note(_("adding branch\n"))
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f = vfs.open(tmpbundlefile, "rb")
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gen = exchange.readbundle(ui, f, tmpbundlefile, vfs)
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if not repo.ui.verbose:
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# silence internal shuffling chatter
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repo.ui.pushbuffer()
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if isinstance(gen, bundle2.unbundle20):
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with repo.transaction('strip') as tr:
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tr.hookargs = {'source': 'strip',
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'url': 'bundle:' + vfs.join(tmpbundlefile)}
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bundle2.applybundle(repo, gen, tr, source='strip',
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url='bundle:' + vfs.join(tmpbundlefile))
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else:
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gen.apply(repo, 'strip', 'bundle:' + vfs.join(tmpbundlefile),
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True)
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if not repo.ui.verbose:
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repo.ui.popbuffer()
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f.close()
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repo._phasecache.invalidate()
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for m in updatebm:
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bm[m] = repo[newbmtarget].node()
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lock = tr = None
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try:
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lock = repo.lock()
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tr = repo.transaction('repair')
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bm.recordchange(tr)
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tr.close()
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finally:
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tr.release()
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lock.release()
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# remove undo files
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for undovfs, undofile in repo.undofiles():
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try:
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undovfs.unlink(undofile)
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except OSError as e:
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if e.errno != errno.ENOENT:
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ui.warn(_('error removing %s: %s\n') %
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(undovfs.join(undofile), str(e)))
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except: # re-raises
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if backupfile:
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ui.warn(_("strip failed, backup bundle stored in '%s'\n")
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% vfs.join(backupfile))
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if tmpbundlefile:
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ui.warn(_("strip failed, unrecovered changes stored in '%s'\n")
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% vfs.join(tmpbundlefile))
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ui.warn(_("(fix the problem, then recover the changesets with "
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"\"hg unbundle '%s'\")\n") % vfs.join(tmpbundlefile))
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raise
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else:
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if tmpbundlefile:
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# Remove temporary bundle only if there were no exceptions
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vfs.unlink(tmpbundlefile)
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repo.destroyed()
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def rebuildfncache(ui, repo):
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"""Rebuilds the fncache file from repo history.
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Missing entries will be added. Extra entries will be removed.
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"""
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repo = repo.unfiltered()
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if 'fncache' not in repo.requirements:
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ui.warn(_('(not rebuilding fncache because repository does not '
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'support fncache)\n'))
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return
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with repo.lock():
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fnc = repo.store.fncache
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# Trigger load of fncache.
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if 'irrelevant' in fnc:
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pass
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oldentries = set(fnc.entries)
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newentries = set()
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seenfiles = set()
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repolen = len(repo)
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for rev in repo:
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ui.progress(_('rebuilding'), rev, total=repolen,
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unit=_('changesets'))
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ctx = repo[rev]
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for f in ctx.files():
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# This is to minimize I/O.
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if f in seenfiles:
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continue
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seenfiles.add(f)
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i = 'data/%s.i' % f
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d = 'data/%s.d' % f
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if repo.store._exists(i):
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newentries.add(i)
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if repo.store._exists(d):
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newentries.add(d)
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ui.progress(_('rebuilding'), None)
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if 'treemanifest' in repo.requirements: # safe but unnecessary otherwise
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for dir in util.dirs(seenfiles):
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i = 'meta/%s/00manifest.i' % dir
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d = 'meta/%s/00manifest.d' % dir
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if repo.store._exists(i):
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newentries.add(i)
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if repo.store._exists(d):
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newentries.add(d)
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addcount = len(newentries - oldentries)
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removecount = len(oldentries - newentries)
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for p in sorted(oldentries - newentries):
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ui.write(_('removing %s\n') % p)
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for p in sorted(newentries - oldentries):
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ui.write(_('adding %s\n') % p)
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if addcount or removecount:
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ui.write(_('%d items added, %d removed from fncache\n') %
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(addcount, removecount))
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fnc.entries = newentries
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fnc._dirty = True
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with repo.transaction('fncache') as tr:
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fnc.write(tr)
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else:
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ui.write(_('fncache already up to date\n'))
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def stripbmrevset(repo, mark):
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"""
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The revset to strip when strip is called with -B mark
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Needs to live here so extensions can use it and wrap it even when strip is
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not enabled or not present on a box.
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"""
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return repo.revs("ancestors(bookmark(%s)) - "
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"ancestors(head() and not bookmark(%s)) - "
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"ancestors(bookmark() and not bookmark(%s))",
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mark, mark, mark)
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def deleteobsmarkers(obsstore, indices):
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"""Delete some obsmarkers from obsstore and return how many were deleted
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'indices' is a list of ints which are the indices
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of the markers to be deleted.
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Every invocation of this function completely rewrites the obsstore file,
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skipping the markers we want to be removed. The new temporary file is
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created, remaining markers are written there and on .close() this file
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gets atomically renamed to obsstore, thus guaranteeing consistency."""
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if not indices:
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# we don't want to rewrite the obsstore with the same content
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return
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left = []
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current = obsstore._all
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n = 0
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for i, m in enumerate(current):
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if i in indices:
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n += 1
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continue
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left.append(m)
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newobsstorefile = obsstore.svfs('obsstore', 'w', atomictemp=True)
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for bytes in obsolete.encodemarkers(left, True, obsstore._version):
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newobsstorefile.write(bytes)
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newobsstorefile.close()
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return n
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