narrow: use diffmatcher to send only new filelogs in non-ellipses widening

Before this patch, when we widen a non-ellipses narrow clone, we downloads all
the filelogs matching the resulting new matcher. This is same as the ellipses
case but can be improved because, we don't pull new csets in non-ellipses cases,
we can only download the new added files instead of downloading all the files
which matches the new matcher.

So, we only download files which matches the new matcher but does not matches
the old matcher. There exists a match.differencematcher() which is used here.

This will lead to significant amount of speedup in extending a non-ellipses
narrow copy on large repos because we will download and process only the new
required filelogs.

The tests changes demonstrate that we are downloading now less files.

Thanks to Augie for pointing that functionality of differencematcher exists in
core.

Differential Revision: https://phab.mercurial-scm.org/D4614

hgext/narrow/narrowbundle2.py

@@ -1,335 +1,339 b''
 # narrowbundle2.py - bundle2 extensions for narrow repository support
 #
 # Copyright 2017 Google, Inc.
 #
 # 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 struct
 
 from mercurial.i18n import _
 from mercurial.node import (
     bin,
     nullid,
 )
 from mercurial import (
     bundle2,
     changegroup,
     error,
     exchange,
     extensions,
+    match as matchmod,
     narrowspec,
     repair,
     repository,
     util,
     wireprototypes,
 )
 from mercurial.utils import (
     stringutil,
 )
 
 NARROWCAP = 'narrow'
 _NARROWACL_SECTION = 'narrowhgacl'
 _CHANGESPECPART = NARROWCAP + ':changespec'
 _SPECPART = NARROWCAP + ':spec'
 _SPECPART_INCLUDE = 'include'
 _SPECPART_EXCLUDE = 'exclude'
 _KILLNODESIGNAL = 'KILL'
 _DONESIGNAL = 'DONE'
 _ELIDEDCSHEADER = '>20s20s20sl' # cset id, p1, p2, len(text)
 _ELIDEDMFHEADER = '>20s20s20s20sl' # manifest id, p1, p2, link id, len(text)
 _CSHEADERSIZE = struct.calcsize(_ELIDEDCSHEADER)
 _MFHEADERSIZE = struct.calcsize(_ELIDEDMFHEADER)
 
 # When advertising capabilities, always include narrow clone support.
 def getrepocaps_narrow(orig, repo, **kwargs):
     caps = orig(repo, **kwargs)
     caps[NARROWCAP] = ['v0']
     return caps
 
 def getbundlechangegrouppart_widen(bundler, repo, source, bundlecaps=None,
                                    b2caps=None, heads=None, common=None,
                                    **kwargs):
     """Handling changegroup changegroup generation on the server when user
     is widening their narrowspec"""
 
     cgversions = b2caps.get('changegroup')
     if cgversions:  # 3.1 and 3.2 ship with an empty value
         cgversions = [v for v in cgversions
                       if v in changegroup.supportedoutgoingversions(repo)]
         if not cgversions:
             raise ValueError(_('no common changegroup version'))
         version = max(cgversions)
     else:
         raise ValueError(_("server does not advertise changegroup version,"
                            " can't negotiate support for ellipsis nodes"))
 
     include = sorted(filter(bool, kwargs.get(r'includepats', [])))
     exclude = sorted(filter(bool, kwargs.get(r'excludepats', [])))
     newmatch = narrowspec.match(repo.root, include=include, exclude=exclude)
     oldinclude = sorted(filter(bool, kwargs.get(r'oldincludepats', [])))
     oldexclude = sorted(filter(bool, kwargs.get(r'oldexcludepats', [])))
+    oldmatch = narrowspec.match(repo.root, include=oldinclude,
+                                exclude=oldexclude)
+    diffmatch = matchmod.differencematcher(newmatch, oldmatch)
     common = set(common or [nullid])
 
     if (oldinclude != include or oldexclude != exclude):
         common = repo.revs("::%ln", common)
         commonnodes = set()
         cl = repo.changelog
         for c in common:
             commonnodes.add(cl.node(c))
         if commonnodes:
             # XXX: we should only send the filelogs (and treemanifest). user
             # already has the changelog and manifest
             packer = changegroup.getbundler(version, repo,
-                                            filematcher=newmatch,
+                                            filematcher=diffmatch,
                                             fullnodes=commonnodes)
             cgdata = packer.generate(set([nullid]), list(commonnodes), False,
                     source)
 
             part = bundler.newpart('changegroup', data=cgdata)
             part.addparam('version', version)
             if 'treemanifest' in repo.requirements:
                 part.addparam('treemanifest', '1')
 
 # Serve a changegroup for a client with a narrow clone.
 def getbundlechangegrouppart_narrow(bundler, repo, source,
                                     bundlecaps=None, b2caps=None, heads=None,
                                     common=None, **kwargs):
     assert repo.ui.configbool('experimental', 'narrowservebrokenellipses')
 
     cgversions = b2caps.get('changegroup')
     if cgversions:  # 3.1 and 3.2 ship with an empty value
         cgversions = [v for v in cgversions
                       if v in changegroup.supportedoutgoingversions(repo)]
         if not cgversions:
             raise ValueError(_('no common changegroup version'))
         version = max(cgversions)
     else:
         raise ValueError(_("server does not advertise changegroup version,"
                            " can't negotiate support for ellipsis nodes"))
 
     include = sorted(filter(bool, kwargs.get(r'includepats', [])))
     exclude = sorted(filter(bool, kwargs.get(r'excludepats', [])))
     newmatch = narrowspec.match(repo.root, include=include, exclude=exclude)
 
     depth = kwargs.get(r'depth', None)
     if depth is not None:
         depth = int(depth)
         if depth < 1:
             raise error.Abort(_('depth must be positive, got %d') % depth)
 
     heads = set(heads or repo.heads())
     common = set(common or [nullid])
     oldinclude = sorted(filter(bool, kwargs.get(r'oldincludepats', [])))
     oldexclude = sorted(filter(bool, kwargs.get(r'oldexcludepats', [])))
     known = {bin(n) for n in kwargs.get(r'known', [])}
     if known and (oldinclude != include or oldexclude != exclude):
         # Steps:
         # 1. Send kill for "$known & ::common"
         #
         # 2. Send changegroup for ::common
         #
         # 3. Proceed.
         #
         # In the future, we can send kills for only the specific
         # nodes we know should go away or change shape, and then
         # send a data stream that tells the client something like this:
         #
         # a) apply this changegroup
         # b) apply nodes XXX, YYY, ZZZ that you already have
         # c) goto a
         #
         # until they've built up the full new state.
         # Convert to revnums and intersect with "common". The client should
         # have made it a subset of "common" already, but let's be safe.
         known = set(repo.revs("%ln & ::%ln", known, common))
         # TODO: we could send only roots() of this set, and the
         # list of nodes in common, and the client could work out
         # what to strip, instead of us explicitly sending every
         # single node.
         deadrevs = known
         def genkills():
             for r in deadrevs:
                 yield _KILLNODESIGNAL
                 yield repo.changelog.node(r)
             yield _DONESIGNAL
         bundler.newpart(_CHANGESPECPART, data=genkills())
         newvisit, newfull, newellipsis = exchange._computeellipsis(
             repo, set(), common, known, newmatch)
         if newvisit:
             packer = changegroup.getbundler(version, repo,
                                             filematcher=newmatch,
                                             ellipses=True,
                                             shallow=depth is not None,
                                             ellipsisroots=newellipsis,
                                             fullnodes=newfull)
             cgdata = packer.generate(common, newvisit, False, source)
 
             part = bundler.newpart('changegroup', data=cgdata)
             part.addparam('version', version)
             if 'treemanifest' in repo.requirements:
                 part.addparam('treemanifest', '1')
 
     visitnodes, relevant_nodes, ellipsisroots = exchange._computeellipsis(
         repo, common, heads, set(), newmatch, depth=depth)
 
     repo.ui.debug('Found %d relevant revs\n' % len(relevant_nodes))
     if visitnodes:
         packer = changegroup.getbundler(version, repo,
                                         filematcher=newmatch,
                                         ellipses=True,
                                         shallow=depth is not None,
                                         ellipsisroots=ellipsisroots,
                                         fullnodes=relevant_nodes)
         cgdata = packer.generate(common, visitnodes, False, source)
 
         part = bundler.newpart('changegroup', data=cgdata)
         part.addparam('version', version)
         if 'treemanifest' in repo.requirements:
             part.addparam('treemanifest', '1')
 
 @bundle2.parthandler(_SPECPART, (_SPECPART_INCLUDE, _SPECPART_EXCLUDE))
 def _handlechangespec_2(op, inpart):
     includepats = set(inpart.params.get(_SPECPART_INCLUDE, '').splitlines())
     excludepats = set(inpart.params.get(_SPECPART_EXCLUDE, '').splitlines())
     narrowspec.validatepatterns(includepats)
     narrowspec.validatepatterns(excludepats)
 
     if not repository.NARROW_REQUIREMENT in op.repo.requirements:
         op.repo.requirements.add(repository.NARROW_REQUIREMENT)
         op.repo._writerequirements()
     op.repo.setnarrowpats(includepats, excludepats)
 
 @bundle2.parthandler(_CHANGESPECPART)
 def _handlechangespec(op, inpart):
     repo = op.repo
     cl = repo.changelog
 
     # changesets which need to be stripped entirely. either they're no longer
     # needed in the new narrow spec, or the server is sending a replacement
     # in the changegroup part.
     clkills = set()
 
     # A changespec part contains all the updates to ellipsis nodes
     # that will happen as a result of widening or narrowing a
     # repo. All the changes that this block encounters are ellipsis
     # nodes or flags to kill an existing ellipsis.
     chunksignal = changegroup.readexactly(inpart, 4)
     while chunksignal != _DONESIGNAL:
         if chunksignal == _KILLNODESIGNAL:
             # a node used to be an ellipsis but isn't anymore
             ck = changegroup.readexactly(inpart, 20)
             if cl.hasnode(ck):
                 clkills.add(ck)
         else:
             raise error.Abort(
                 _('unexpected changespec node chunk type: %s') % chunksignal)
         chunksignal = changegroup.readexactly(inpart, 4)
 
     if clkills:
         # preserve bookmarks that repair.strip() would otherwise strip
         bmstore = repo._bookmarks
         class dummybmstore(dict):
             def applychanges(self, repo, tr, changes):
                 pass
             def recordchange(self, tr): # legacy version
                 pass
         repo._bookmarks = dummybmstore()
         chgrpfile = repair.strip(op.ui, repo, list(clkills), backup=True,
                                  topic='widen')
         repo._bookmarks = bmstore
         if chgrpfile:
             op._widen_uninterr = repo.ui.uninterruptable()
             op._widen_uninterr.__enter__()
             # presence of _widen_bundle attribute activates widen handler later
             op._widen_bundle = chgrpfile
     # Set the new narrowspec if we're widening. The setnewnarrowpats() method
     # will currently always be there when using the core+narrowhg server, but
     # other servers may include a changespec part even when not widening (e.g.
     # because we're deepening a shallow repo).
     if util.safehasattr(repo, 'setnewnarrowpats'):
         repo.setnewnarrowpats()
 
 def handlechangegroup_widen(op, inpart):
     """Changegroup exchange handler which restores temporarily-stripped nodes"""
     # We saved a bundle with stripped node data we must now restore.
     # This approach is based on mercurial/repair.py@6ee26a53c111.
     repo = op.repo
     ui = op.ui
 
     chgrpfile = op._widen_bundle
     del op._widen_bundle
     vfs = repo.vfs
 
     ui.note(_("adding branch\n"))
     f = vfs.open(chgrpfile, "rb")
     try:
         gen = exchange.readbundle(ui, f, chgrpfile, vfs)
         if not ui.verbose:
             # silence internal shuffling chatter
             ui.pushbuffer()
         if isinstance(gen, bundle2.unbundle20):
             with repo.transaction('strip') as tr:
                 bundle2.processbundle(repo, gen, lambda: tr)
         else:
             gen.apply(repo, 'strip', 'bundle:' + vfs.join(chgrpfile), True)
         if not ui.verbose:
             ui.popbuffer()
     finally:
         f.close()
 
     # 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)))
 
     # Remove partial backup only if there were no exceptions
     op._widen_uninterr.__exit__(None, None, None)
     vfs.unlink(chgrpfile)
 
 def setup():
     """Enable narrow repo support in bundle2-related extension points."""
     extensions.wrapfunction(bundle2, 'getrepocaps', getrepocaps_narrow)
 
     getbundleargs = wireprototypes.GETBUNDLE_ARGUMENTS
 
     getbundleargs['narrow'] = 'boolean'
     getbundleargs['widen'] = 'boolean'
     getbundleargs['depth'] = 'plain'
     getbundleargs['oldincludepats'] = 'csv'
     getbundleargs['oldexcludepats'] = 'csv'
     getbundleargs['includepats'] = 'csv'
     getbundleargs['excludepats'] = 'csv'
     getbundleargs['known'] = 'csv'
 
     # Extend changegroup serving to handle requests from narrow clients.
     origcgfn = exchange.getbundle2partsmapping['changegroup']
     def wrappedcgfn(*args, **kwargs):
         repo = args[1]
         if repo.ui.has_section(_NARROWACL_SECTION):
             kwargs = exchange.applynarrowacl(repo, kwargs)
 
         if (kwargs.get(r'narrow', False) and
             repo.ui.configbool('experimental', 'narrowservebrokenellipses')):
             getbundlechangegrouppart_narrow(*args, **kwargs)
         elif kwargs.get(r'widen', False) and kwargs.get(r'narrow', False):
             getbundlechangegrouppart_widen(*args, **kwargs)
         else:
             origcgfn(*args, **kwargs)
     exchange.getbundle2partsmapping['changegroup'] = wrappedcgfn
 
     # Extend changegroup receiver so client can fixup after widen requests.
     origcghandler = bundle2.parthandlermapping['changegroup']
     def wrappedcghandler(op, inpart):
         origcghandler(op, inpart)
         if util.safehasattr(op, '_widen_bundle'):
             handlechangegroup_widen(op, inpart)
     wrappedcghandler.params = origcghandler.params
     bundle2.parthandlermapping['changegroup'] = wrappedcghandler

tests/test-narrow-widen-no-ellipsis.t

@@ -1,389 +1,389 b''
 #testcases tree flat
   $ . "$TESTDIR/narrow-library.sh"
 
 #if tree
   $ cat << EOF >> $HGRCPATH
   > [experimental]
   > treemanifest = 1
   > EOF
 #endif
 
   $ hg init master
   $ cd master
 
   $ mkdir inside
   $ echo 'inside' > inside/f
   $ hg add inside/f
   $ hg commit -m 'add inside'
 
   $ mkdir widest
   $ echo 'widest' > widest/f
   $ hg add widest/f
   $ hg commit -m 'add widest'
 
   $ mkdir outside
   $ echo 'outside' > outside/f
   $ hg add outside/f
   $ hg commit -m 'add outside'
 
   $ cd ..
 
 narrow clone the inside file
 
   $ hg clone --narrow ssh://user@dummy/master narrow --include inside
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 3 changesets with 1 changes to 1 files
   new changesets *:* (glob)
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd narrow
   $ hg tracked
   I path:inside
   $ ls
   inside
   $ cat inside/f
   inside
   $ cd ..
 
 add more upstream files which we will include in a wider narrow spec
 
   $ cd master
 
   $ mkdir wider
   $ echo 'wider' > wider/f
   $ hg add wider/f
   $ echo 'widest v2' > widest/f
   $ hg commit -m 'add wider, update widest'
 
   $ echo 'widest v3' > widest/f
   $ hg commit -m 'update widest v3'
 
   $ echo 'inside v2' > inside/f
   $ hg commit -m 'update inside'
 
   $ mkdir outside2
   $ echo 'outside2' > outside2/f
   $ hg add outside2/f
   $ hg commit -m 'add outside2'
 
   $ echo 'widest v4' > widest/f
   $ hg commit -m 'update widest v4'
 
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   7: update widest v4
   6: add outside2
   5: update inside
   4: update widest v3
   3: add wider, update widest
   2: add outside
   1: add widest
   0: add inside
 
   $ cd ..
 
 Widen the narrow spec to see the widest file. This should not get the newly
 added upstream revisions.
 
   $ cd narrow
   $ hg tracked --addinclude widest/f
   comparing with ssh://user@dummy/master
   searching for changes
   no changes found
   adding changesets
   adding manifests
   adding file changes
-  added 0 changesets with 1 changes to 2 files
+  added 0 changesets with 1 changes to 1 files
   3 local changesets published
   $ hg tracked
   I path:inside
   I path:widest/f
 
   $ cat widest/f
   widest
 
 Pull down the newly added upstream revision.
 
   $ hg pull
   pulling from ssh://user@dummy/master
   searching for changes
   adding changesets
   adding manifests
   adding file changes
   added 5 changesets with 4 changes to 2 files
   new changesets *:* (glob)
   (run 'hg update' to get a working copy)
   $ hg update -r 'desc("add wider")'
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ cat widest/f
   widest v2
 
   $ hg update -r 'desc("update inside")'
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cat widest/f
   widest v3
   $ cat inside/f
   inside v2
 
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   7: update widest v4
   6: add outside2
   5: update inside
   4: update widest v3
   3: add wider, update widest
   2: add outside
   1: add widest
   0: add inside
 
 Check that widening with a newline fails
 
   $ hg tracked --addinclude 'widest
   > '
   abort: newlines are not allowed in narrowspec paths
   [255]
 
 widen the narrow spec to include the wider file
 
   $ hg tracked --addinclude wider
   comparing with ssh://user@dummy/master
   searching for changes
   no changes found
   adding changesets
   adding manifests
   adding file changes
-  added 0 changesets with 1 changes to 3 files
+  added 0 changesets with 1 changes to 1 files
   5 local changesets published
   $ hg tracked
   I path:inside
   I path:wider
   I path:widest/f
   $ hg update 'desc("add widest")'
   2 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ cat widest/f
   widest
   $ hg update 'desc("add wider, update widest")'
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cat wider/f
   wider
   $ cat widest/f
   widest v2
   $ hg update 'desc("update widest v3")'
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cat widest/f
   widest v3
   $ hg update 'desc("update widest v4")'
   2 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cat widest/f
   widest v4
 
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   7: update widest v4
   6: add outside2
   5: update inside
   4: update widest v3
   3: add wider, update widest
   2: add outside
   1: add widest
   0: add inside
 
 separate suite of tests: files from 0-10 modified in changes 0-10. This allows
 more obvious precise tests tickling particular corner cases.
 
   $ cd ..
   $ hg init upstream
   $ cd upstream
   $ for x in `$TESTDIR/seq.py 0 10`
   > do
   >   mkdir d$x
   >   echo $x > d$x/f
   >   hg add d$x/f
   >   hg commit -m "add d$x/f"
   > done
   $ hg log -T "{rev}: {desc}\n"
   10: add d10/f
   9: add d9/f
   8: add d8/f
   7: add d7/f
   6: add d6/f
   5: add d5/f
   4: add d4/f
   3: add d3/f
   2: add d2/f
   1: add d1/f
   0: add d0/f
 
 make narrow clone with every third node.
 
   $ cd ..
   $ hg clone --narrow ssh://user@dummy/upstream narrow2 --include d0 --include d3 --include d6 --include d9
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 11 changesets with 4 changes to 4 files
   new changesets *:* (glob)
   updating to branch default
   4 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd narrow2
   $ hg tracked
   I path:d0
   I path:d3
   I path:d6
   I path:d9
   $ hg verify
   checking changesets
   checking manifests
   checking directory manifests (tree !)
   crosschecking files in changesets and manifests
   checking files
   checked 11 changesets with 4 changes to 4 files
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   10: add d10/f
   9: add d9/f
   8: add d8/f
   7: add d7/f
   6: add d6/f
   5: add d5/f
   4: add d4/f
   3: add d3/f
   2: add d2/f
   1: add d1/f
   0: add d0/f
   $ hg tracked --addinclude d1
   comparing with ssh://user@dummy/upstream
   searching for changes
   no changes found
   adding changesets
   adding manifests
   adding file changes
-  added 0 changesets with 1 changes to 5 files
+  added 0 changesets with 1 changes to 1 files
   11 local changesets published
   $ hg tracked
   I path:d0
   I path:d1
   I path:d3
   I path:d6
   I path:d9
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   10: add d10/f
   9: add d9/f
   8: add d8/f
   7: add d7/f
   6: add d6/f
   5: add d5/f
   4: add d4/f
   3: add d3/f
   2: add d2/f
   1: add d1/f
   0: add d0/f
 
 Verify shouldn't claim the repo is corrupt after a widen.
 
   $ hg verify
   checking changesets
   checking manifests
   checking directory manifests (tree !)
   crosschecking files in changesets and manifests
   checking files
   checked 11 changesets with 5 changes to 5 files
 
 Widening preserves parent of local commit
 
   $ cd ..
   $ hg clone -q --narrow ssh://user@dummy/upstream narrow3 --include d2 -r 2
   $ cd narrow3
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   2: add d2/f
   1: add d1/f
   0: add d0/f
   $ hg pull -q -r 3
   $ hg co -q tip
   $ hg pull -q -r 4
   $ echo local > d2/f
   $ hg ci -m local
   created new head
   $ hg tracked -q --addinclude d0 --addinclude d9
 
 Widening preserves bookmarks
 
   $ cd ..
   $ hg clone -q --narrow ssh://user@dummy/upstream narrow-bookmarks --include d4
   $ cd narrow-bookmarks
   $ echo local > d4/f
   $ hg ci -m local
   $ hg bookmarks bookmark
   $ hg bookmarks
    * bookmark                  11:* (glob)
   $ hg -q tracked --addinclude d2
   $ hg bookmarks
    * bookmark                  11:* (glob)
   $ hg log -r bookmark -T '{desc}\n'
   local
 
 Widening that fails can be recovered from
 
   $ cd ..
   $ hg clone -q --narrow ssh://user@dummy/upstream interrupted --include d0
   $ cd interrupted
   $ echo local > d0/f
   $ hg ci -m local
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   11: local
   10: add d10/f
   9: add d9/f
   8: add d8/f
   7: add d7/f
   6: add d6/f
   5: add d5/f
   4: add d4/f
   3: add d3/f
   2: add d2/f
   1: add d1/f
   0: add d0/f
   $ hg bookmarks bookmark
   $ hg --config hooks.pretxnchangegroup.bad=false tracked --addinclude d1
   comparing with ssh://user@dummy/upstream
   searching for changes
   no changes found
   adding changesets
   adding manifests
   adding file changes
-  added 0 changesets with 1 changes to 2 files
+  added 0 changesets with 1 changes to 1 files
   11 local changesets published
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   11: local
   10: add d10/f
   9: add d9/f
   8: add d8/f
   7: add d7/f
   6: add d6/f
   5: add d5/f
   4: add d4/f
   3: add d3/f
   2: add d2/f
   1: add d1/f
   0: add d0/f
   $ hg bookmarks
    * bookmark                  11:* (glob)
   $ hg unbundle .hg/strip-backup/*-widen.hg
   abort: .hg/strip-backup/*-widen.hg: $ENOTDIR$ (windows !)
   abort: $ENOENT$: .hg/strip-backup/*-widen.hg (no-windows !)
   [255]
   $ hg log -T "{if(ellipsis, '...')}{rev}: {desc}\n"
   11: local
   10: add d10/f
   9: add d9/f
   8: add d8/f
   7: add d7/f
   6: add d6/f
   5: add d5/f
   4: add d4/f
   3: add d3/f
   2: add d2/f
   1: add d1/f
   0: add d0/f
   $ hg bookmarks
    * bookmark                  11:* (glob)