strip: fix bug with treemanifests and unordered linkrevs

This is the treemanifest version of f45f7390c1c5 (strip: calculate
list of extra nodes to save and pass it to changegroupsubset,
2008-01-19).

Differential Revision: https://phab.mercurial-scm.org/D6795

mercurial/repair.py

@@ -1,480 +1,478 b''
 # repair.py - functions for repository repair for mercurial
 #
 # Copyright 2005, 2006 Chris Mason <[e-mail]>
 # Copyright 2007 Matt Mackall
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from __future__ import absolute_import
 
 import errno
 import hashlib
 
 from .i18n import _
 from .node import (
     hex,
     short,
 )
 from . import (
     bundle2,
     changegroup,
     discovery,
     error,
     exchange,
     obsolete,
     obsutil,
     phases,
     pycompat,
     util,
 )
 from .utils import (
     stringutil,
 )
 
 def backupbundle(repo, bases, heads, node, suffix, compress=True,
                  obsolescence=True):
     """create a bundle with the specified revisions as a backup"""
 
     backupdir = "strip-backup"
     vfs = repo.vfs
     if not vfs.isdir(backupdir):
         vfs.mkdir(backupdir)
 
     # Include a hash of all the nodes in the filename for uniqueness
     allcommits = repo.set('%ln::%ln', bases, heads)
     allhashes = sorted(c.hex() for c in allcommits)
     totalhash = hashlib.sha1(''.join(allhashes)).digest()
     name = "%s/%s-%s-%s.hg" % (backupdir, short(node),
                                hex(totalhash[:4]), suffix)
 
     cgversion = changegroup.localversion(repo)
     comp = None
     if cgversion != '01':
         bundletype = "HG20"
         if compress:
             comp = 'BZ'
     elif compress:
         bundletype = "HG10BZ"
     else:
         bundletype = "HG10UN"
 
     outgoing = discovery.outgoing(repo, missingroots=bases, missingheads=heads)
     contentopts = {
         'cg.version': cgversion,
         'obsolescence': obsolescence,
         'phases': True,
     }
     return bundle2.writenewbundle(repo.ui, repo, 'strip', name, bundletype,
                                   outgoing, contentopts, vfs, compression=comp)
 
 def _collectfiles(repo, striprev):
     """find out the filelogs affected by the strip"""
     files = set()
 
     for x in pycompat.xrange(striprev, len(repo)):
         files.update(repo[x].files())
 
     return sorted(files)
 
 def _collectrevlog(revlog, striprev):
     _, brokenset = revlog.getstrippoint(striprev)
     return [revlog.linkrev(r) for r in brokenset]
 
-def _collectmanifest(repo, striprev):
-    return _collectrevlog(repo.manifestlog.getstorage(b''), striprev)
-
 def _collectbrokencsets(repo, files, striprev):
     """return the changesets which will be broken by the truncation"""
     s = set()
 
-    s.update(_collectmanifest(repo, striprev))
+    for revlog in manifestrevlogs(repo):
+        s.update(_collectrevlog(revlog, striprev))
     for fname in files:
         s.update(_collectrevlog(repo.file(fname), striprev))
 
     return s
 
 def strip(ui, repo, nodelist, backup=True, topic='backup'):
     # This function requires the caller to lock the repo, but it operates
     # within a transaction of its own, and thus requires there to be no current
     # transaction when it is called.
     if repo.currenttransaction() is not None:
         raise error.ProgrammingError('cannot strip from inside a transaction')
 
     # Simple way to maintain backwards compatibility for this
     # argument.
     if backup in ['none', 'strip']:
         backup = False
 
     repo = repo.unfiltered()
     repo.destroying()
     vfs = repo.vfs
     # load bookmark before changelog to avoid side effect from outdated
     # changelog (see repo._refreshchangelog)
     repo._bookmarks
     cl = repo.changelog
 
     # TODO handle undo of merge sets
     if isinstance(nodelist, str):
         nodelist = [nodelist]
     striplist = [cl.rev(node) for node in nodelist]
     striprev = min(striplist)
 
     files = _collectfiles(repo, striprev)
     saverevs = _collectbrokencsets(repo, files, striprev)
 
     # Some revisions with rev > striprev may not be descendants of striprev.
     # We have to find these revisions and put them in a bundle, so that
     # we can restore them after the truncations.
     # To create the bundle we use repo.changegroupsubset which requires
     # the list of heads and bases of the set of interesting revisions.
     # (head = revision in the set that has no descendant in the set;
     #  base = revision in the set that has no ancestor in the set)
     tostrip = set(striplist)
     saveheads = set(saverevs)
     for r in cl.revs(start=striprev + 1):
         if any(p in tostrip for p in cl.parentrevs(r)):
             tostrip.add(r)
 
         if r not in tostrip:
             saverevs.add(r)
             saveheads.difference_update(cl.parentrevs(r))
             saveheads.add(r)
     saveheads = [cl.node(r) for r in saveheads]
 
     # compute base nodes
     if saverevs:
         descendants = set(cl.descendants(saverevs))
         saverevs.difference_update(descendants)
     savebases = [cl.node(r) for r in saverevs]
     stripbases = [cl.node(r) for r in tostrip]
 
     stripobsidx = obsmarkers = ()
     if repo.ui.configbool('devel', 'strip-obsmarkers'):
         obsmarkers = obsutil.exclusivemarkers(repo, stripbases)
     if obsmarkers:
         stripobsidx = [i for i, m in enumerate(repo.obsstore)
                        if m in obsmarkers]
 
     newbmtarget, updatebm = _bookmarkmovements(repo, tostrip)
 
     backupfile = None
     node = nodelist[-1]
     if backup:
         backupfile = _createstripbackup(repo, stripbases, node, topic)
     # create a changegroup for all the branches we need to keep
     tmpbundlefile = None
     if saveheads:
         # do not compress temporary bundle if we remove it from disk later
         #
         # We do not include obsolescence, it might re-introduce prune markers
         # we are trying to strip.  This is harmless since the stripped markers
         # are already backed up and we did not touched the markers for the
         # saved changesets.
         tmpbundlefile = backupbundle(repo, savebases, saveheads, node, 'temp',
                                      compress=False, obsolescence=False)
 
     with ui.uninterruptible():
         try:
             with repo.transaction("strip") as tr:
                 # TODO this code violates the interface abstraction of the
                 # transaction and makes assumptions that file storage is
                 # using append-only files. We'll need some kind of storage
                 # API to handle stripping for us.
                 offset = len(tr._entries)
 
                 tr.startgroup()
                 cl.strip(striprev, tr)
                 stripmanifest(repo, striprev, tr, files)
 
                 for fn in files:
                     repo.file(fn).strip(striprev, tr)
                 tr.endgroup()
 
                 for i in pycompat.xrange(offset, len(tr._entries)):
                     file, troffset, ignore = tr._entries[i]
                     with repo.svfs(file, 'a', checkambig=True) as fp:
                         fp.truncate(troffset)
                     if troffset == 0:
                         repo.store.markremoved(file)
 
                 deleteobsmarkers(repo.obsstore, stripobsidx)
                 del repo.obsstore
                 repo.invalidatevolatilesets()
                 repo._phasecache.filterunknown(repo)
 
             if tmpbundlefile:
                 ui.note(_("adding branch\n"))
                 f = vfs.open(tmpbundlefile, "rb")
                 gen = exchange.readbundle(ui, f, tmpbundlefile, vfs)
                 if not repo.ui.verbose:
                     # silence internal shuffling chatter
                     repo.ui.pushbuffer()
                 tmpbundleurl = 'bundle:' + vfs.join(tmpbundlefile)
                 txnname = 'strip'
                 if not isinstance(gen, bundle2.unbundle20):
                     txnname = "strip\n%s" % util.hidepassword(tmpbundleurl)
                 with repo.transaction(txnname) as tr:
                     bundle2.applybundle(repo, gen, tr, source='strip',
                                         url=tmpbundleurl)
                 if not repo.ui.verbose:
                     repo.ui.popbuffer()
                 f.close()
 
             with repo.transaction('repair') as tr:
                 bmchanges = [(m, repo[newbmtarget].node()) for m in updatebm]
                 repo._bookmarks.applychanges(repo, tr, bmchanges)
 
             # remove undo files
             for undovfs, undofile in repo.undofiles():
                 try:
                     undovfs.unlink(undofile)
                 except OSError as e:
                     if e.errno != errno.ENOENT:
                         ui.warn(_('error removing %s: %s\n') %
                                 (undovfs.join(undofile),
                                  stringutil.forcebytestr(e)))
 
         except: # re-raises
             if backupfile:
                 ui.warn(_("strip failed, backup bundle stored in '%s'\n")
                         % vfs.join(backupfile))
             if tmpbundlefile:
                 ui.warn(_("strip failed, unrecovered changes stored in '%s'\n")
                         % vfs.join(tmpbundlefile))
                 ui.warn(_("(fix the problem, then recover the changesets with "
                           "\"hg unbundle '%s'\")\n") % vfs.join(tmpbundlefile))
             raise
         else:
             if tmpbundlefile:
                 # Remove temporary bundle only if there were no exceptions
                 vfs.unlink(tmpbundlefile)
 
     repo.destroyed()
     # return the backup file path (or None if 'backup' was False) so
     # extensions can use it
     return backupfile
 
 def softstrip(ui, repo, nodelist, backup=True, topic='backup'):
     """perform a "soft" strip using the archived phase"""
     tostrip = [c.node() for c in repo.set('sort(%ln::)', nodelist)]
     if not tostrip:
         return None
 
     newbmtarget, updatebm = _bookmarkmovements(repo, tostrip)
     if backup:
         node = tostrip[0]
         backupfile = _createstripbackup(repo, tostrip, node, topic)
 
     with repo.transaction('strip') as tr:
         phases.retractboundary(repo, tr, phases.archived, tostrip)
         bmchanges = [(m, repo[newbmtarget].node()) for m in updatebm]
         repo._bookmarks.applychanges(repo, tr, bmchanges)
     return backupfile
 
 
 def _bookmarkmovements(repo, tostrip):
     # compute necessary bookmark movement
     bm = repo._bookmarks
     updatebm = []
     for m in bm:
         rev = repo[bm[m]].rev()
         if rev in tostrip:
             updatebm.append(m)
     newbmtarget = None
     # If we need to move bookmarks, compute bookmark
     # targets. Otherwise we can skip doing this logic.
     if updatebm:
         # For a set s, max(parents(s) - s) is the same as max(heads(::s - s)),
         # but is much faster
         newbmtarget = repo.revs('max(parents(%ld) - (%ld))', tostrip, tostrip)
         if newbmtarget:
             newbmtarget = repo[newbmtarget.first()].node()
         else:
             newbmtarget = '.'
     return newbmtarget, updatebm
 
 def _createstripbackup(repo, stripbases, node, topic):
     # backup the changeset we are about to strip
     vfs = repo.vfs
     cl = repo.changelog
     backupfile = backupbundle(repo, stripbases, cl.heads(), node, topic)
     repo.ui.status(_("saved backup bundle to %s\n") %
                    vfs.join(backupfile))
     repo.ui.log("backupbundle", "saved backup bundle to %s\n",
                 vfs.join(backupfile))
     return backupfile
 
 def safestriproots(ui, repo, nodes):
     """return list of roots of nodes where descendants are covered by nodes"""
     torev = repo.unfiltered().changelog.rev
     revs = set(torev(n) for n in nodes)
     # tostrip = wanted - unsafe = wanted - ancestors(orphaned)
     # orphaned = affected - wanted
     # affected = descendants(roots(wanted))
     # wanted = revs
     revset = '%ld - ( ::( (roots(%ld):: and not _phase(%s)) -%ld) )'
     tostrip = set(repo.revs(revset, revs, revs, phases.internal, revs))
     notstrip = revs - tostrip
     if notstrip:
         nodestr = ', '.join(sorted(short(repo[n].node()) for n in notstrip))
         ui.warn(_('warning: orphaned descendants detected, '
                   'not stripping %s\n') % nodestr)
     return [c.node() for c in repo.set('roots(%ld)', tostrip)]
 
 class stripcallback(object):
     """used as a transaction postclose callback"""
 
     def __init__(self, ui, repo, backup, topic):
         self.ui = ui
         self.repo = repo
         self.backup = backup
         self.topic = topic or 'backup'
         self.nodelist = []
 
     def addnodes(self, nodes):
         self.nodelist.extend(nodes)
 
     def __call__(self, tr):
         roots = safestriproots(self.ui, self.repo, self.nodelist)
         if roots:
             strip(self.ui, self.repo, roots, self.backup, self.topic)
 
 def delayedstrip(ui, repo, nodelist, topic=None, backup=True):
     """like strip, but works inside transaction and won't strip irreverent revs
 
     nodelist must explicitly contain all descendants. Otherwise a warning will
     be printed that some nodes are not stripped.
 
     Will do a backup if `backup` is True. The last non-None "topic" will be
     used as the backup topic name. The default backup topic name is "backup".
     """
     tr = repo.currenttransaction()
     if not tr:
         nodes = safestriproots(ui, repo, nodelist)
         return strip(ui, repo, nodes, backup=backup, topic=topic)
     # transaction postclose callbacks are called in alphabet order.
     # use '\xff' as prefix so we are likely to be called last.
     callback = tr.getpostclose('\xffstrip')
     if callback is None:
         callback = stripcallback(ui, repo, backup=backup, topic=topic)
         tr.addpostclose('\xffstrip', callback)
     if topic:
         callback.topic = topic
     callback.addnodes(nodelist)
 
 def stripmanifest(repo, striprev, tr, files):
     for revlog in manifestrevlogs(repo):
         revlog.strip(striprev, tr)
 
 def manifestrevlogs(repo):
     yield repo.manifestlog.getstorage(b'')
     if 'treemanifest' in repo.requirements:
         # This logic is safe if treemanifest isn't enabled, but also
         # pointless, so we skip it if treemanifest isn't enabled.
         for unencoded, encoded, size in repo.store.datafiles():
             if (unencoded.startswith('meta/') and
                 unencoded.endswith('00manifest.i')):
                 dir = unencoded[5:-12]
                 yield repo.manifestlog.getstorage(dir)
 
 def rebuildfncache(ui, repo):
     """Rebuilds the fncache file from repo history.
 
     Missing entries will be added. Extra entries will be removed.
     """
     repo = repo.unfiltered()
 
     if 'fncache' not in repo.requirements:
         ui.warn(_('(not rebuilding fncache because repository does not '
                   'support fncache)\n'))
         return
 
     with repo.lock():
         fnc = repo.store.fncache
         fnc.ensureloaded(warn=ui.warn)
 
         oldentries = set(fnc.entries)
         newentries = set()
         seenfiles = set()
 
         progress = ui.makeprogress(_('rebuilding'), unit=_('changesets'),
                                    total=len(repo))
         for rev in repo:
             progress.update(rev)
 
             ctx = repo[rev]
             for f in ctx.files():
                 # This is to minimize I/O.
                 if f in seenfiles:
                     continue
                 seenfiles.add(f)
 
                 i = 'data/%s.i' % f
                 d = 'data/%s.d' % f
 
                 if repo.store._exists(i):
                     newentries.add(i)
                 if repo.store._exists(d):
                     newentries.add(d)
 
         progress.complete()
 
         if 'treemanifest' in repo.requirements:
             # This logic is safe if treemanifest isn't enabled, but also
             # pointless, so we skip it if treemanifest isn't enabled.
             for dir in util.dirs(seenfiles):
                 i = 'meta/%s/00manifest.i' % dir
                 d = 'meta/%s/00manifest.d' % dir
 
                 if repo.store._exists(i):
                     newentries.add(i)
                 if repo.store._exists(d):
                     newentries.add(d)
 
         addcount = len(newentries - oldentries)
         removecount = len(oldentries - newentries)
         for p in sorted(oldentries - newentries):
             ui.write(_('removing %s\n') % p)
         for p in sorted(newentries - oldentries):
             ui.write(_('adding %s\n') % p)
 
         if addcount or removecount:
             ui.write(_('%d items added, %d removed from fncache\n') %
                      (addcount, removecount))
             fnc.entries = newentries
             fnc._dirty = True
 
             with repo.transaction('fncache') as tr:
                 fnc.write(tr)
         else:
             ui.write(_('fncache already up to date\n'))
 
 def deleteobsmarkers(obsstore, indices):
     """Delete some obsmarkers from obsstore and return how many were deleted
 
     'indices' is a list of ints which are the indices
     of the markers to be deleted.
 
     Every invocation of this function completely rewrites the obsstore file,
     skipping the markers we want to be removed. The new temporary file is
     created, remaining markers are written there and on .close() this file
     gets atomically renamed to obsstore, thus guaranteeing consistency."""
     if not indices:
         # we don't want to rewrite the obsstore with the same content
         return
 
     left = []
     current = obsstore._all
     n = 0
     for i, m in enumerate(current):
         if i in indices:
             n += 1
             continue
         left.append(m)
 
     newobsstorefile = obsstore.svfs('obsstore', 'w', atomictemp=True)
     for bytes in obsolete.encodemarkers(left, True, obsstore._version):
         newobsstorefile.write(bytes)
     newobsstorefile.close()
     return n

tests/test-strip-cross.t

@@ -1,225 +1,220 b''
 test stripping of filelogs where the linkrev doesn't always increase
 
   $ echo '[extensions]' >> $HGRCPATH
   $ echo 'strip =' >> $HGRCPATH
   $ commit()
   > {
   >     hg up -qC null
   >     count=1
   >     for i in "$@"; do
   >         for f in $i; do
   >             mkdir -p `dirname $f`
   >             echo $count > $f
   >         done
   >         count=`expr $count + 1`
   >     done
   >     hg commit -qAm "$*"
   > }
 
 2 1 0 2 0 1 2
 
   $ mkdir files
   $ cd files
   $ hg init orig
   $ cd orig
   $ commit '201 210'
   $ commit '102 120' '210'
   $ commit '021'
   $ commit '201' '021 120'
   $ commit '012 021' '102 201' '120 210'
   $ commit '102 120' '012 210' '021 201'
   $ commit '201 210' '021 120' '012 102'
   $ cd ..
   $ hg clone -q -U -r 4 -r 5 -r 6 orig crossed
   $ cd crossed
 
   $ for i in 012 021 102 120 201 210; do
   >     echo $i
   >     hg debugindex $i
   >     echo
   > done
   012
      rev linkrev nodeid       p1           p2
        0       0 b8e02f643373 000000000000 000000000000
        1       1 5d9299349fc0 000000000000 000000000000
        2       2 2661d26c6496 000000000000 000000000000
   
   021
      rev linkrev nodeid       p1           p2
        0       0 b8e02f643373 000000000000 000000000000
        1       2 5d9299349fc0 000000000000 000000000000
        2       1 2661d26c6496 000000000000 000000000000
   
   102
      rev linkrev nodeid       p1           p2
        0       1 b8e02f643373 000000000000 000000000000
        1       0 5d9299349fc0 000000000000 000000000000
        2       2 2661d26c6496 000000000000 000000000000
   
   120
      rev linkrev nodeid       p1           p2
        0       1 b8e02f643373 000000000000 000000000000
        1       2 5d9299349fc0 000000000000 000000000000
        2       0 2661d26c6496 000000000000 000000000000
   
   201
      rev linkrev nodeid       p1           p2
        0       2 b8e02f643373 000000000000 000000000000
        1       0 5d9299349fc0 000000000000 000000000000
        2       1 2661d26c6496 000000000000 000000000000
   
   210
      rev linkrev nodeid       p1           p2
        0       2 b8e02f643373 000000000000 000000000000
        1       1 5d9299349fc0 000000000000 000000000000
        2       0 2661d26c6496 000000000000 000000000000
   
   $ cd ..
   $ for i in 0 1 2; do
   >     hg clone -q -U --pull crossed $i
   >     echo "% Trying to strip revision $i"
   >     hg --cwd $i strip $i
   >     echo "% Verifying"
   >     hg --cwd $i verify
   >     echo
   > done
   % Trying to strip revision 0
   saved backup bundle to $TESTTMP/files/0/.hg/strip-backup/cbb8c2f0a2e3-239800b9-backup.hg
   % Verifying
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   checked 2 changesets with 12 changes to 6 files
   
   % Trying to strip revision 1
   saved backup bundle to $TESTTMP/files/1/.hg/strip-backup/124ecc0cbec9-6104543f-backup.hg
   % Verifying
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   checked 2 changesets with 12 changes to 6 files
   
   % Trying to strip revision 2
   saved backup bundle to $TESTTMP/files/2/.hg/strip-backup/f6439b304a1a-c6505a5f-backup.hg
   % Verifying
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   checked 2 changesets with 12 changes to 6 files
   
   $ cd ..
 
 Do a similar test where the manifest revlog has unordered linkrevs
   $ mkdir manifests
   $ cd manifests
   $ hg init orig
   $ cd orig
   $ commit 'file'
   $ commit 'other'
   $ commit '' 'other'
   $ HGUSER=another-user; export HGUSER
   $ commit 'file'
   $ commit 'other' 'file'
   $ cd ..
   $ hg clone -q -U -r 1 -r 2 -r 3 -r 4 orig crossed
   $ cd crossed
   $ hg debugindex --manifest
      rev linkrev nodeid       p1           p2
        0       2 6bbc6fee55c2 000000000000 000000000000
        1       0 1c556153fe54 000000000000 000000000000
        2       1 1f76dba919fd 000000000000 000000000000
        3       3 bbee06ad59d5 000000000000 000000000000
 
   $ cd ..
   $ for i in 2 3; do
   >     hg clone -q -U --pull crossed $i
   >     echo "% Trying to strip revision $i"
   >     hg --cwd $i strip $i
   >     echo "% Verifying"
   >     hg --cwd $i verify
   >     echo
   > done
   % Trying to strip revision 2
   saved backup bundle to $TESTTMP/manifests/2/.hg/strip-backup/f3015ad03c03-4d98bdc2-backup.hg
   % Verifying
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   checked 3 changesets with 3 changes to 2 files
   
   % Trying to strip revision 3
   saved backup bundle to $TESTTMP/manifests/3/.hg/strip-backup/9632aa303aa4-69192e3f-backup.hg
   % Verifying
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   checked 3 changesets with 3 changes to 2 files
   
   $ cd ..
 
 Now a similar test for a non-root manifest revlog
   $ cat >> $HGRCPATH <<EOF
   > [experimental]
   > treemanifests = yes
   > EOF
   $ mkdir treemanifests
   $ cd treemanifests
   $ 
   $ hg --config experimental.treemanifest=True init orig
   $ cd orig
   $ commit 'dir/file'
   $ commit 'dir/other'
   $ commit '' 'dir/other'
   $ HGUSER=yet-another-user; export HGUSER
   $ commit 'otherdir dir/file'
   $ commit 'otherdir dir/other' 'otherdir dir/file'
   $ cd ..
   $ hg --config experimental.treemanifest=True clone -q -U -r 1 -r 2 -r 3 -r 4 orig crossed
   $ cd crossed
   $ hg debugindex --dir dir
      rev linkrev nodeid       p1           p2
        0       2 6bbc6fee55c2 000000000000 000000000000
        1       0 1c556153fe54 000000000000 000000000000
        2       1 1f76dba919fd 000000000000 000000000000
        3       3 bbee06ad59d5 000000000000 000000000000
 
   $ cd ..
   $ for i in 2 3; do
   >     hg --config experimental.treemanifest=True clone -q -U --pull crossed $i
   >     echo "% Trying to strip revision $i"
   >     hg --cwd $i strip $i
   >     echo "% Verifying"
   >     hg --cwd $i verify
   >     echo
   > done
   % Trying to strip revision 2
   saved backup bundle to $TESTTMP/treemanifests/2/.hg/strip-backup/145f5c75f9ac-a105cfbe-backup.hg
   % Verifying
   checking changesets
   checking manifests
   checking directory manifests
-   dir/@0: parent-directory manifest refers to unknown revision 1c556153fe54
-   dir/@1: parent-directory manifest refers to unknown revision 1f76dba919fd
   crosschecking files in changesets and manifests
   checking files
-   dir/other@1: 5d9299349fc0 not in manifests
   checked 3 changesets with 4 changes to 3 files
-  3 integrity errors encountered!
-  (first damaged changeset appears to be 0)
   
   % Trying to strip revision 3
   saved backup bundle to $TESTTMP/treemanifests/3/.hg/strip-backup/e4e3de5c3cb2-f4c70376-backup.hg
   % Verifying
   checking changesets
   checking manifests
   checking directory manifests
   crosschecking files in changesets and manifests
   checking files
   checked 3 changesets with 4 changes to 3 files
   
   $ cd ..