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# 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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discovery,
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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, obsolescence=True):
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"""create a bundle with the specified revisions as a backup"""
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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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cgversion = changegroup.safeversion(repo)
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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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outgoing = discovery.outgoing(repo, missingroots=bases, missingheads=heads)
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contentopts = {
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'cg.version': cgversion,
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'obsolescence': obsolescence,
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'phases': True,
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}
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return bundle2.writenewbundle(repo.ui, repo, 'strip', name, bundletype,
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outgoing, contentopts, vfs, 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.manifestlog._revlog)
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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 requires the caller to lock the repo, but it operates
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# within a transaction of its own, and thus requires there to be no current
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# transaction when it is called.
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if repo.currenttransaction() is not None:
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raise error.ProgrammingError('cannot strip from inside a transaction')
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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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files = _collectfiles(repo, striprev)
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saverevs = _collectbrokencsets(repo, files, striprev)
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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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saveheads = set(saverevs)
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for r in cl.revs(start=striprev + 1):
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if any(p in tostrip for p in cl.parentrevs(r)):
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tostrip.add(r)
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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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stripobsidx = obsmarkers = ()
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if repo.ui.configbool('devel', 'strip-obsmarkers', True):
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obsmarkers = obsolete.exclusivemarkers(repo, stripbases)
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if obsmarkers:
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stripobsidx = [i for i, m in enumerate(repo.obsstore)
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if m in obsmarkers]
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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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#
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# We do not include obsolescence, it might re-introduce prune markers
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# we are trying to strip. This is harmless since the stripped markers
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# are already backed up and we did not touched the markers for the
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# saved changesets.
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tmpbundlefile = _bundle(repo, savebases, saveheads, node, 'temp',
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compress=False, obsolescence=False)
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mfst = repo.manifestlog._revlog
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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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striptrees(repo, tr, striprev, files)
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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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deleteobsmarkers(repo.obsstore, stripobsidx)
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del repo.obsstore
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repo._phasecache.filterunknown(repo)
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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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tmpbundleurl = 'bundle:' + vfs.join(tmpbundlefile)
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txnname = 'strip'
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if not isinstance(gen, bundle2.unbundle20):
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txnname = "strip\n%s" % util.hidepassword(tmpbundleurl)
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with repo.transaction(txnname) as tr:
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bundle2.applybundle(repo, gen, tr, source='strip',
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url=tmpbundleurl, emptyok=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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with repo.transaction('repair') as tr:
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bm.recordchange(tr)
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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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# return the backup file path (or None if 'backup' was False) so
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# extensions can use it
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return backupfile
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def striptrees(repo, tr, striprev, files):
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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.manifestlog._revlog.dirlog(dir).strip(striprev, tr)
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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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