largefiles: avoid unnecessary creation of .hg/largefiles when opening lfdirstate

Previously, the directory '.hg/largefiles' would always be created if it didn't
exist when the lfdirstate was opened.  If there were no standin files, no
dirstate file would be created in the directory.  The end result was that
enabling the largefiles extension globally, but not explicitly adding a
largefile would result in the repository eventually sprouting this directory.

Creation of this directory effectively changes readonly operations like summary
and status into operations that require write access.  Without write access,
commands that would succeed without the extension loaded would abort with a
surprising error when the extension is loaded, but not actively used:

  $ hg sum -R /tmp/thg --config extensions.largefiles=
  parent: 16541:00dc703d5aed
   repowidget: specify incoming bundle by plain file path to avoid url parsing
  branch: default
  abort: Permission denied: '/tmp/thg/.hg/largefiles'


This change is simpler than changing the callers of openlfdirstate() to use the
'create' parameter that was introduced in ae57920ac188, and probably how that
should have been implemented in the first place.

hgext/largefiles/lfutil.py

@@ -1,390 +1,394 b''
 # Copyright 2009-2010 Gregory P. Ward
 # Copyright 2009-2010 Intelerad Medical Systems Incorporated
 # Copyright 2010-2011 Fog Creek Software
 # Copyright 2010-2011 Unity Technologies
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 '''largefiles utility code: must not import other modules in this package.'''
 
 import os
 import platform
 import shutil
 import stat
 
 from mercurial import dirstate, httpconnection, match as match_, util, scmutil
 from mercurial.i18n import _
 from mercurial import node
 
 shortname = '.hglf'
 shortnameslash = shortname + '/'
 longname = 'largefiles'
 
 
 # -- Private worker functions ------------------------------------------
 
 def getminsize(ui, assumelfiles, opt, default=10):
     lfsize = opt
     if not lfsize and assumelfiles:
         lfsize = ui.config(longname, 'minsize', default=default)
     if lfsize:
         try:
             lfsize = float(lfsize)
         except ValueError:
             raise util.Abort(_('largefiles: size must be number (not %s)\n')
                              % lfsize)
     if lfsize is None:
         raise util.Abort(_('minimum size for largefiles must be specified'))
     return lfsize
 
 def link(src, dest):
     util.makedirs(os.path.dirname(dest))
     try:
         util.oslink(src, dest)
     except OSError:
         # if hardlinks fail, fallback on atomic copy
         dst = util.atomictempfile(dest)
         for chunk in util.filechunkiter(open(src, 'rb')):
             dst.write(chunk)
         dst.close()
         os.chmod(dest, os.stat(src).st_mode)
 
 def usercachepath(ui, hash):
     path = ui.configpath(longname, 'usercache', None)
     if path:
         path = os.path.join(path, hash)
     else:
         if os.name == 'nt':
             appdata = os.getenv('LOCALAPPDATA', os.getenv('APPDATA'))
             if appdata:
                 path = os.path.join(appdata, longname, hash)
         elif platform.system() == 'Darwin':
             home = os.getenv('HOME')
             if home:
                 path = os.path.join(home, 'Library', 'Caches',
                                     longname, hash)
         elif os.name == 'posix':
             path = os.getenv('XDG_CACHE_HOME')
             if path:
                 path = os.path.join(path, longname, hash)
             else:
                 home = os.getenv('HOME')
                 if home:
                     path = os.path.join(home, '.cache', longname, hash)
         else:
             raise util.Abort(_('unknown operating system: %s\n') % os.name)
     return path
 
 def inusercache(ui, hash):
     path = usercachepath(ui, hash)
     return path and os.path.exists(path)
 
 def findfile(repo, hash):
     if instore(repo, hash):
         repo.ui.note(_('found %s in store\n') % hash)
         return storepath(repo, hash)
     elif inusercache(repo.ui, hash):
         repo.ui.note(_('found %s in system cache\n') % hash)
         path = storepath(repo, hash)
         link(usercachepath(repo.ui, hash), path)
         return path
     return None
 
 class largefilesdirstate(dirstate.dirstate):
     def __getitem__(self, key):
         return super(largefilesdirstate, self).__getitem__(unixpath(key))
     def normal(self, f):
         return super(largefilesdirstate, self).normal(unixpath(f))
     def remove(self, f):
         return super(largefilesdirstate, self).remove(unixpath(f))
     def add(self, f):
         return super(largefilesdirstate, self).add(unixpath(f))
     def drop(self, f):
         return super(largefilesdirstate, self).drop(unixpath(f))
     def forget(self, f):
         return super(largefilesdirstate, self).forget(unixpath(f))
     def normallookup(self, f):
         return super(largefilesdirstate, self).normallookup(unixpath(f))
     def _ignore(self, f):
         return False
 
 def openlfdirstate(ui, repo, create=True):
     '''
     Return a dirstate object that tracks largefiles: i.e. its root is
     the repo root, but it is saved in .hg/largefiles/dirstate.
     '''
     lfstoredir = repo.join(longname)
     opener = scmutil.opener(lfstoredir)
     lfdirstate = largefilesdirstate(opener, ui, repo.root,
                                      repo.dirstate._validate)
 
     # If the largefiles dirstate does not exist, populate and create
     # it. This ensures that we create it on the first meaningful
     # largefiles operation in a new clone.
     if create and not os.path.exists(os.path.join(lfstoredir, 'dirstate')):
+        matcher = getstandinmatcher(repo)
+        standins = repo.dirstate.walk(matcher, [], False, False)
+
+        if len(standins) > 0:
         util.makedirs(lfstoredir)
-        matcher = getstandinmatcher(repo)
-        for standin in repo.dirstate.walk(matcher, [], False, False):
+
+        for standin in standins:
             lfile = splitstandin(standin)
             lfdirstate.normallookup(lfile)
     return lfdirstate
 
 def lfdirstatestatus(lfdirstate, repo, rev):
     match = match_.always(repo.root, repo.getcwd())
     s = lfdirstate.status(match, [], False, False, False)
     unsure, modified, added, removed, missing, unknown, ignored, clean = s
     for lfile in unsure:
         try:
             fctx = repo[rev][standin(lfile)]
         except LookupError:
             fctx = None
         if not fctx or fctx.data().strip() != hashfile(repo.wjoin(lfile)):
             modified.append(lfile)
         else:
             clean.append(lfile)
             lfdirstate.normal(lfile)
     return (modified, added, removed, missing, unknown, ignored, clean)
 
 def listlfiles(repo, rev=None, matcher=None):
     '''return a list of largefiles in the working copy or the
     specified changeset'''
 
     if matcher is None:
         matcher = getstandinmatcher(repo)
 
     # ignore unknown files in working directory
     return [splitstandin(f)
             for f in repo[rev].walk(matcher)
             if rev is not None or repo.dirstate[f] != '?']
 
 def instore(repo, hash):
     return os.path.exists(storepath(repo, hash))
 
 def storepath(repo, hash):
     return repo.join(os.path.join(longname, hash))
 
 def copyfromcache(repo, hash, filename):
     '''Copy the specified largefile from the repo or system cache to
     filename in the repository. Return true on success or false if the
     file was not found in either cache (which should not happened:
     this is meant to be called only after ensuring that the needed
     largefile exists in the cache).'''
     path = findfile(repo, hash)
     if path is None:
         return False
     util.makedirs(os.path.dirname(repo.wjoin(filename)))
     # The write may fail before the file is fully written, but we
     # don't use atomic writes in the working copy.
     shutil.copy(path, repo.wjoin(filename))
     return True
 
 def copytostore(repo, rev, file, uploaded=False):
     hash = readstandin(repo, file, rev)
     if instore(repo, hash):
         return
     copytostoreabsolute(repo, repo.wjoin(file), hash)
 
 def copyalltostore(repo, node):
     '''Copy all largefiles in a given revision to the store'''
 
     ctx = repo[node]
     for filename in ctx.files():
         if isstandin(filename) and filename in ctx.manifest():
             realfile = splitstandin(filename)
             copytostore(repo, ctx.node(), realfile)
 
 
 def copytostoreabsolute(repo, file, hash):
     if inusercache(repo.ui, hash):
         link(usercachepath(repo.ui, hash), storepath(repo, hash))
     elif not getattr(repo, "_isconverting", False):
         util.makedirs(os.path.dirname(storepath(repo, hash)))
         dst = util.atomictempfile(storepath(repo, hash),
                                   createmode=repo.store.createmode)
         for chunk in util.filechunkiter(open(file, 'rb')):
             dst.write(chunk)
         dst.close()
         linktousercache(repo, hash)
 
 def linktousercache(repo, hash):
     path = usercachepath(repo.ui, hash)
     if path:
         link(storepath(repo, hash), path)
 
 def getstandinmatcher(repo, pats=[], opts={}):
     '''Return a match object that applies pats to the standin directory'''
     standindir = repo.wjoin(shortname)
     if pats:
         pats = [os.path.join(standindir, pat) for pat in pats]
     else:
         # no patterns: relative to repo root
         pats = [standindir]
     # no warnings about missing files or directories
     match = scmutil.match(repo[None], pats, opts)
     match.bad = lambda f, msg: None
     return match
 
 def composestandinmatcher(repo, rmatcher):
     '''Return a matcher that accepts standins corresponding to the
     files accepted by rmatcher. Pass the list of files in the matcher
     as the paths specified by the user.'''
     smatcher = getstandinmatcher(repo, rmatcher.files())
     isstandin = smatcher.matchfn
     def composedmatchfn(f):
         return isstandin(f) and rmatcher.matchfn(splitstandin(f))
     smatcher.matchfn = composedmatchfn
 
     return smatcher
 
 def standin(filename):
     '''Return the repo-relative path to the standin for the specified big
     file.'''
     # Notes:
     # 1) Some callers want an absolute path, but for instance addlargefiles
     #    needs it repo-relative so it can be passed to repo[None].add().  So
     #    leave it up to the caller to use repo.wjoin() to get an absolute path.
     # 2) Join with '/' because that's what dirstate always uses, even on
     #    Windows. Change existing separator to '/' first in case we are
     #    passed filenames from an external source (like the command line).
     return shortnameslash + util.pconvert(filename)
 
 def isstandin(filename):
     '''Return true if filename is a big file standin. filename must be
     in Mercurial's internal form (slash-separated).'''
     return filename.startswith(shortnameslash)
 
 def splitstandin(filename):
     # Split on / because that's what dirstate always uses, even on Windows.
     # Change local separator to / first just in case we are passed filenames
     # from an external source (like the command line).
     bits = util.pconvert(filename).split('/', 1)
     if len(bits) == 2 and bits[0] == shortname:
         return bits[1]
     else:
         return None
 
 def updatestandin(repo, standin):
     file = repo.wjoin(splitstandin(standin))
     if os.path.exists(file):
         hash = hashfile(file)
         executable = getexecutable(file)
         writestandin(repo, standin, hash, executable)
 
 def readstandin(repo, filename, node=None):
     '''read hex hash from standin for filename at given node, or working
     directory if no node is given'''
     return repo[node][standin(filename)].data().strip()
 
 def writestandin(repo, standin, hash, executable):
     '''write hash to <repo.root>/<standin>'''
     repo.wwrite(standin, hash + '\n', executable and 'x' or '')
 
 def copyandhash(instream, outfile):
     '''Read bytes from instream (iterable) and write them to outfile,
     computing the SHA-1 hash of the data along the way. Return the hash.'''
     hasher = util.sha1('')
     for data in instream:
         hasher.update(data)
         outfile.write(data)
     return hasher.hexdigest()
 
 def hashrepofile(repo, file):
     return hashfile(repo.wjoin(file))
 
 def hashfile(file):
     if not os.path.exists(file):
         return ''
     hasher = util.sha1('')
     fd = open(file, 'rb')
     for data in util.filechunkiter(fd, 128 * 1024):
         hasher.update(data)
     fd.close()
     return hasher.hexdigest()
 
 def getexecutable(filename):
     mode = os.stat(filename).st_mode
     return ((mode & stat.S_IXUSR) and
             (mode & stat.S_IXGRP) and
             (mode & stat.S_IXOTH))
 
 def urljoin(first, second, *arg):
     def join(left, right):
         if not left.endswith('/'):
             left += '/'
         if right.startswith('/'):
             right = right[1:]
         return left + right
 
     url = join(first, second)
     for a in arg:
         url = join(url, a)
     return url
 
 def hexsha1(data):
     """hexsha1 returns the hex-encoded sha1 sum of the data in the file-like
     object data"""
     h = util.sha1()
     for chunk in util.filechunkiter(data):
         h.update(chunk)
     return h.hexdigest()
 
 def httpsendfile(ui, filename):
     return httpconnection.httpsendfile(ui, filename, 'rb')
 
 def unixpath(path):
     '''Return a version of path normalized for use with the lfdirstate.'''
     return util.pconvert(os.path.normpath(path))
 
 def islfilesrepo(repo):
     if ('largefiles' in repo.requirements and
             util.any(shortnameslash in f[0] for f in repo.store.datafiles())):
         return True
 
     return util.any(openlfdirstate(repo.ui, repo, False))
 
 class storeprotonotcapable(Exception):
     def __init__(self, storetypes):
         self.storetypes = storetypes
 
 def getstandinsstate(repo):
     standins = []
     matcher = getstandinmatcher(repo)
     for standin in repo.dirstate.walk(matcher, [], False, False):
         lfile = splitstandin(standin)
         try:
             hash = readstandin(repo, lfile)
         except IOError:
             hash = None
         standins.append((lfile, hash))
     return standins
 
 def getlfilestoupdate(oldstandins, newstandins):
     changedstandins = set(oldstandins).symmetric_difference(set(newstandins))
     filelist = []
     for f in changedstandins:
         if f[0] not in filelist:
             filelist.append(f[0])
     return filelist
 
 def getlfilestoupload(repo, missing, addfunc):
     for n in missing:
         parents = [p for p in repo.changelog.parents(n) if p != node.nullid]
         ctx = repo[n]
         files = set(ctx.files())
         if len(parents) == 2:
             mc = ctx.manifest()
             mp1 = ctx.parents()[0].manifest()
             mp2 = ctx.parents()[1].manifest()
             for f in mp1:
                 if f not in mc:
                     files.add(f)
             for f in mp2:
                 if f not in mc:
                     files.add(f)
             for f in mc:
                 if mc[f] != mp1.get(f, None) or mc[f] != mp2.get(f, None):
                     files.add(f)
         for fn in files:
             if isstandin(fn) and fn in ctx:
                 addfunc(fn, ctx[fn].data().strip())

tests/test-issue3084.t

@@ -1,357 +1,370 b''
 
   $ echo "[extensions]" >> $HGRCPATH
   $ echo "largefiles =" >> $HGRCPATH
 
 Create the repository outside $HOME since largefiles write to
 $HOME/.cache/largefiles.
 
   $ hg init test
   $ cd test
   $ echo "root" > root
   $ hg add root
   $ hg commit -m "Root commit"
 
   $ echo "large" > foo
   $ hg add --large foo
   $ hg commit -m "Add foo as a largefile"
 
   $ hg update -r 0
   getting changed largefiles
   0 largefiles updated, 1 removed
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
 
   $ echo "normal" > foo
   $ hg add foo
   $ hg commit -m "Add foo as normal file"
   created new head
 
 Normal file in the working copy, keeping the normal version:
 
   $ echo "n" | hg merge --config ui.interactive=Yes
   remote turned local normal file foo into a largefile
   use (l)argefile or keep (n)ormal file? 0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
 
   $ hg status
   $ cat foo
   normal
 
 Normal file in the working copy, keeping the largefile version:
 
   $ hg update -q -C
   $ echo "l" | hg merge --config ui.interactive=Yes
   remote turned local normal file foo into a largefile
   use (l)argefile or keep (n)ormal file? 1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
 
   $ hg status
   M foo
 
   $ hg diff --nodates
   diff -r fa129ab6b5a7 .hglf/foo
   --- /dev/null
   +++ b/.hglf/foo
   @@ -0,0 +1,1 @@
   +7f7097b041ccf68cc5561e9600da4655d21c6d18
   diff -r fa129ab6b5a7 foo
   --- a/foo
   +++ /dev/null
   @@ -1,1 +0,0 @@
   -normal
 
   $ cat foo
   large
 
 Largefile in the working copy, keeping the normal version:
 
   $ hg update -q -C -r 1
   $ echo "n" | hg merge --config ui.interactive=Yes
   remote turned local largefile foo into a normal file
   keep (l)argefile or use (n)ormal file? 1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
 
   $ hg status
   M foo
 
   $ hg diff --nodates
   diff -r ff521236428a .hglf/foo
   --- a/.hglf/foo
   +++ /dev/null
   @@ -1,1 +0,0 @@
   -7f7097b041ccf68cc5561e9600da4655d21c6d18
   diff -r ff521236428a foo
   --- /dev/null
   +++ b/foo
   @@ -0,0 +1,1 @@
   +normal
 
   $ cat foo
   normal
 
 Largefile in the working copy, keeping the largefile version:
 
   $ hg update -q -C -r 1
   $ echo "l" | hg merge --config ui.interactive=Yes
   remote turned local largefile foo into a normal file
   keep (l)argefile or use (n)ormal file? 0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
 
   $ hg status
 
   $ cat foo
   large
 
 Whatever ... commit something so we can invoke merge when updating
 
   $ hg commit -m '3: Merge'
 
 Updating from largefile to normal - no reason to prompt
 
   $ hg up -r 2
   getting changed largefiles
   0 largefiles updated, 0 removed
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ cat foo
   normal
 
 (the update above used to leave the working dir in a very weird state - clean it
   $ hg up -qr null
   $ hg up -qr 2
 )
 
 Updating from normal to largefile - no reason to prompt
 
   $ hg up -r 3
   getting changed largefiles
   1 largefiles updated, 0 removed
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ cat foo
   large
 
   $ cd ..
 
 
 Systematic testing of merges involving largefiles:
 
 Ancestor: normal  Parent: normal=  Parent: large   result: large
 Ancestor: normal  Parent: normal2  Parent: large   result: ?
 Ancestor: large   Parent: large=   Parent: normal  result: normal
 Ancestor: large   Parent: large2   Parent: normal  result: ?
 
 All cases should try merging both ways.
 "=" means same file content.
 
 Prepare test repo:
 
   $ hg init merges
   $ cd merges
   $ touch f1
-  $ hg ci -Aqm "0-root"
+  $ hg ci -Aqm "0-root" --config extensions.largefiles=!
+
+Ensure that .hg/largefiles isn't created before largefiles are added
+#if unix-permissions
+  $ chmod 555 .hg
+#endif
+  $ hg status
+#if unix-permissions
+  $ chmod 755 .hg
+#endif
+
+  $ find .hg/largefiles
+  find: `.hg/largefiles': No such file or directory
+  [1]
 
 ancestor is "normal":
   $ echo normal > f
   $ hg ci -Aqm "1-normal-ancestor"
   $ touch f2
   $ hg ci -Aqm "2-normal-unchanged"
   $ hg tag -l "normal="
   $ echo normal2 > f
   $ hg ci -m "3-normal2"
   $ hg tag -l "normal2"
   $ hg up -qr 1
   $ hg rm f
   $ echo large > f
   $ hg add --large f
   $ hg ci -qm "4-normal-to-large"
   $ hg tag -l "large"
 
   $ hg up -qr null
 
 ancestor is "large":
   $ echo large > f
   $ hg add --large f
   $ hg ci -qm "5-large-ancestor"
   $ touch f2
   $ hg ci -Aqm "6-large-unchanged"
   $ hg tag -l "large="
   $ echo large2 > f
   $ hg ci -m "7-large2"
   $ hg tag -l "large2"
   $ hg up -qr 5
   $ hg rm f
   $ echo normal > f
   $ hg ci -qAm "8-large-to-normal"
   $ hg tag -l "normal"
 
 Ancestor: normal  Parent: normal=  Parent: large   result: large
 
   $ hg up -Cqr normal=
   $ hg merge -r large
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat f
   large
 
 swap
 
   $ hg up -Cqr large
   $ hg merge -r normal=
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
   $ cat f
   large
 
 Ancestor: normal  Parent: normal2  Parent: large   result: ?
 (annoying extra prompt ... but it do not do any serious harm)
 
   $ hg up -Cqr normal2
   $ hg merge -r large
   local changed f which remote deleted
   use (c)hanged version or (d)elete? c
   remote turned local normal file f into a largefile
   use (l)argefile or keep (n)ormal file? l
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat f
   large
 
   $ hg up -Cqr normal2
   $ ( echo c; echo n ) | hg merge -r large --config ui.interactive=Yes
   local changed f which remote deleted
   use (c)hanged version or (d)elete? remote turned local normal file f into a largefile
   use (l)argefile or keep (n)ormal file? 0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
   $ cat f
   normal2
 
   $ hg up -Cqr normal2
   $ echo d | hg merge -r large --config ui.interactive=Yes
   local changed f which remote deleted
   use (c)hanged version or (d)elete? 1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat f
   large
 
 swap
 
   $ hg up -Cqr large
   $ hg merge -r normal2
   remote changed f which local deleted
   use (c)hanged version or leave (d)eleted? c
   remote turned local largefile f into a normal file
   keep (l)argefile or use (n)ormal file? l
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat f
   large
 
   $ hg up -Cqr large
   $ ( echo c; echo n ) | hg merge -r normal2 --config ui.interactive=Yes
   remote changed f which local deleted
   use (c)hanged version or leave (d)eleted? remote turned local largefile f into a normal file
   keep (l)argefile or use (n)ormal file? 2 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
   $ cat f
   normal2
 
   $ hg up -Cqr large
   $ echo d | hg merge -r normal2 --config ui.interactive=Yes
   remote changed f which local deleted
   use (c)hanged version or leave (d)eleted? 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
   $ cat f
   large
 
 Ancestor: large   Parent: large=   Parent: normal  result: normal
 
   $ hg up -Cqr large=
   $ hg merge -r normal
   1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
   $ cat f
   normal
 
 swap
 
   $ hg up -Cqr normal
   $ hg merge -r large=
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ cat f
   normal
 
 Ancestor: large   Parent: large2   Parent: normal  result: ?
 (annoying extra prompt ... but it do not do any serious harm)
 
   $ hg up -Cqr large2
   $ hg merge -r normal
   local changed .hglf/f which remote deleted
   use (c)hanged version or (d)elete? c
   remote turned local largefile f into a normal file
   keep (l)argefile or use (n)ormal file? l
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat f
   large2
 
   $ hg up -Cqr large2
   $ echo d | hg merge -r normal --config ui.interactive=Yes
   local changed .hglf/f which remote deleted
   use (c)hanged version or (d)elete? 1 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   0 largefiles updated, 0 removed
   $ cat f
   normal
 
 swap
 
   $ hg up -Cqr normal
   $ hg merge -r large2
   remote changed .hglf/f which local deleted
   use (c)hanged version or leave (d)eleted? c
   remote turned local normal file f into a largefile
   use (l)argefile or keep (n)ormal file? l
   2 files updated, 0 files merged, 1 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   getting changed largefiles
   1 largefiles updated, 0 removed
   $ cat f
   large2
 
   $ hg up -Cqr normal
   $ echo d | hg merge -r large2 --config ui.interactive=Yes
   remote changed .hglf/f which local deleted
   use (c)hanged version or leave (d)eleted? 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
   $ cat f
   normal
 
   $ cd ..