named branches: server branchmap wire protocol support (issue736)

The repository command, 'branchmap', returns a dictionary, branchname
-> [branchheads], and will be implemented for localrepo, httprepo and
sshrepo.

The following wire format is used for returning data:

branchname1 branch1head2 branch1head2 ...
branchname2 ...
...

Branch names are URL encoded to escape white space, and branch heads
are sent as hex encoded node ids. All branches and all their heads are
sent.

The background and motivation for this command is the desire for a
richer named branch semantics when pushing changesets. The details are
explained in the original proposal which is included below.


1. BACKGROUND

The algorithm currently implemented in Mercurial only considers the
graph theoretical heads when determining whether new heads are
created, rather than using the branch heads as a count (the algorithm
considers a branch head effectively closed when it is merged into
another branch or a new named branch is started from that point
onward).

Our particular problem with the algorithm is that we'd like to see the
following case working without forcing a push:

Upsteam has:

(0:dev) ---- (1:dev)
\
 `--- (2:stable)

Someone merges stable into dev:

(0:dev) ---- (1:dev) ------(3:dev)
\                         /
 `--- (2:stable) --------´

This can be pushed without --force (as it should).
Now someone else does some coding on stable (a bug fix, say):

(0:dev) ---- (1:dev) ------(3:dev)
\                          /
 `--- (2:stable) ---------´---------(4:stable)

This time we need --force to push.

We allow this to be pushed without using --force by getting all the
remote branch heads (by extending the wire protocol with a new
function).

We would, furthermore, also prefer if it is impossible to push a new
branch without --force (or a later --newbranch option so --force isn't
shoe-horned into too many disparate functions, if need be), except of
course in the case where the remote repository is empty.

This is what our patches accomplish.


2. ALTERNATIVES

We have, of course, considered some alternatives to reconstructing
enough information to decide whether we are creating new remote branch
heads, before we added the new wire protocol command.

2.1. LOOKUP ON REMOTE

The main alternative is to use the information from remote.heads() and
remote.lookup() to try to reconstruct enough graph information to
decide whether we are creating new heads. This is not adequate as
illustrated below.

Remember that each lookup is typically a request-response pair over
SSH or HTTP(S).

If we have a simple repository at the remote end like this:

(0:dev) ---- (1:dev) ---- (3:stable)
\
 `--- (2:dev)

then remote.heads() will yield [2, 3]. Assume we have nodes [0, 1, 2]
locally and want to create a new node, 4:dev, as a descendant from
(1:dev), which should be OK as 1:dev is a branch head.

If we do remote.lookup('dev') we will get [2]. Thus, we can get
information about whether a branch exists on the remote server or not,
but this does not solve our problem of figuring out whether we are
creating new heads or not.

Pushing 4:dev ought to be OK, since after the push, we still only have
two heads on branch a.

Using remote.lookup() and remote.heads() is thus not adequate to
consistently decide whether we are creating new remote heads (e.g. in
this situation the latter would never return 1:dev).

2.2. USING INCOMING TO RECONSTRUCT THE GRAPH

An alternative would be to use information equivalent to hg incoming
to get the full remote graph in addition to the local graph.

To do this, we would have to get a changegroup(subset) bundle
representing the remote end (which may be a substantial amount of
data), getting the branch heads from an instantiated bundlerepository,
deleting the bundle, and finally, we can compute the prepush logic.

While this is backwards compatible, it will cause a possibly
substantial slowdown of the push command as it first needs to pull in
all changes.


3. FURTHER ARGUMENTS IN FAVOUR OF THE BRANCHMAP WIRE-PROTOCOL EXTENSION

Currently, the commands incoming and pull, work based on the tip of a
given branch if used with "-r branchname", making it hard to get all
revisions of a certain branch only (if it has multiple heads). This
can be solved by requesting the remote's branchheads and letting the
revisions to be used with the command be these heads. This can be done
by extending the commands with a new option, e.g.:

hg pull -b branchname

which will be turned into the equivalent of:

hg pull -r branchhead1 -r branchhead2 -r branchhead3

We have a simple follow-up patch that can do this ready as well
(although not submitted yet as it is pending the acceptance of the
branch patch).


4. WRAP-UP

We generally find that the branchmap wire protocol extension can
provide better named branch support to Mercurial. Currently, some
things, like the initial push scenario in this mail, are fairly
counter-intuitive, and the more often you have to force push, the more
it is likely you will get a lot of spurious and unnecessary merge
nodes. Also, restricting incoming and pull to all changes on a branch
rather than changes on the tip-most head would be a sensible extension
to making named branches a first class citizen in Mercurial.
Currently, named branches sometimes feel like a late-coming unwanted
step-child.

We have run it in a production environment for a while, with fewer
multiple heads occurring in our repositories and fewer confused users
as a result.

Also, it fixes the long-standing issue 736.

Co-contributor: Sune Foldager <[e-mail]>

mercurial/hgweb/protocol.py

@@ -1,192 +1,204
 #
 # Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2, incorporated herein by reference.
 
-import cStringIO, zlib, tempfile, errno, os, sys
+import cStringIO, zlib, tempfile, errno, os, sys, urllib
 from mercurial import util, streamclone
 from mercurial.node import bin, hex
 from mercurial import changegroup as changegroupmod
 from common import ErrorResponse, HTTP_OK, HTTP_NOT_FOUND, HTTP_SERVER_ERROR
 
 # __all__ is populated with the allowed commands. Be sure to add to it if
 # you're adding a new command, or the new command won't work.
 
 __all__ = [
    'lookup', 'heads', 'branches', 'between', 'changegroup',
    'changegroupsubset', 'capabilities', 'unbundle', 'stream_out',
+   'branchmap',
 ]
 
 HGTYPE = 'application/mercurial-0.1'
 
 def lookup(repo, req):
     try:
         r = hex(repo.lookup(req.form['key'][0]))
         success = 1
     except Exception,inst:
         r = str(inst)
         success = 0
     resp = "%s %s\n" % (success, r)
     req.respond(HTTP_OK, HGTYPE, length=len(resp))
     yield resp
 
 def heads(repo, req):
     resp = " ".join(map(hex, repo.heads())) + "\n"
     req.respond(HTTP_OK, HGTYPE, length=len(resp))
     yield resp
 
+def branchmap(repo, req):
+    branches = repo.branchmap()
+    heads = []
+    for branch, nodes in branches.iteritems():
+        branchname = urllib.quote(branch)
+        branchnodes = [hex(node) for node in nodes]
+        heads.append('%s %s' % (branchname, ' '.join(branchnodes)))
+    resp = '\n'.join(heads)
+    req.respond(HTTP_OK, HGTYPE, length=len(resp))
+    yield resp
+
 def branches(repo, req):
     nodes = []
     if 'nodes' in req.form:
         nodes = map(bin, req.form['nodes'][0].split(" "))
     resp = cStringIO.StringIO()
     for b in repo.branches(nodes):
         resp.write(" ".join(map(hex, b)) + "\n")
     resp = resp.getvalue()
     req.respond(HTTP_OK, HGTYPE, length=len(resp))
     yield resp
 
 def between(repo, req):
     if 'pairs' in req.form:
         pairs = [map(bin, p.split("-"))
                  for p in req.form['pairs'][0].split(" ")]
     resp = cStringIO.StringIO()
     for b in repo.between(pairs):
         resp.write(" ".join(map(hex, b)) + "\n")
     resp = resp.getvalue()
     req.respond(HTTP_OK, HGTYPE, length=len(resp))
     yield resp
 
 def changegroup(repo, req):
     req.respond(HTTP_OK, HGTYPE)
     nodes = []
 
     if 'roots' in req.form:
         nodes = map(bin, req.form['roots'][0].split(" "))
 
     z = zlib.compressobj()
     f = repo.changegroup(nodes, 'serve')
     while 1:
         chunk = f.read(4096)
         if not chunk:
             break
         yield z.compress(chunk)
 
     yield z.flush()
 
 def changegroupsubset(repo, req):
     req.respond(HTTP_OK, HGTYPE)
     bases = []
     heads = []
 
     if 'bases' in req.form:
         bases = [bin(x) for x in req.form['bases'][0].split(' ')]
     if 'heads' in req.form:
         heads = [bin(x) for x in req.form['heads'][0].split(' ')]
 
     z = zlib.compressobj()
     f = repo.changegroupsubset(bases, heads, 'serve')
     while 1:
         chunk = f.read(4096)
         if not chunk:
             break
         yield z.compress(chunk)
 
     yield z.flush()
 
 def capabilities(repo, req):
-    caps = ['lookup', 'changegroupsubset']
+    caps = ['lookup', 'changegroupsubset', 'branchmap']
     if repo.ui.configbool('server', 'uncompressed', untrusted=True):
         caps.append('stream=%d' % repo.changelog.version)
     if changegroupmod.bundlepriority:
         caps.append('unbundle=%s' % ','.join(changegroupmod.bundlepriority))
     rsp = ' '.join(caps)
     req.respond(HTTP_OK, HGTYPE, length=len(rsp))
     yield rsp
 
 def unbundle(repo, req):
 
     proto = req.env.get('wsgi.url_scheme') or 'http'
     their_heads = req.form['heads'][0].split(' ')
 
     def check_heads():
         heads = map(hex, repo.heads())
         return their_heads == [hex('force')] or their_heads == heads
 
     # fail early if possible
     if not check_heads():
         req.drain()
         raise ErrorResponse(HTTP_OK, 'unsynced changes')
 
     # do not lock repo until all changegroup data is
     # streamed. save to temporary file.
 
     fd, tempname = tempfile.mkstemp(prefix='hg-unbundle-')
     fp = os.fdopen(fd, 'wb+')
     try:
         length = int(req.env['CONTENT_LENGTH'])
         for s in util.filechunkiter(req, limit=length):
             fp.write(s)
 
         try:
             lock = repo.lock()
             try:
                 if not check_heads():
                     raise ErrorResponse(HTTP_OK, 'unsynced changes')
 
                 fp.seek(0)
                 header = fp.read(6)
                 if header.startswith('HG') and not header.startswith('HG10'):
                     raise ValueError('unknown bundle version')
                 elif header not in changegroupmod.bundletypes:
                     raise ValueError('unknown bundle compression type')
                 gen = changegroupmod.unbundle(header, fp)
 
                 # send addchangegroup output to client
 
                 oldio = sys.stdout, sys.stderr
                 sys.stderr = sys.stdout = cStringIO.StringIO()
 
                 try:
                     url = 'remote:%s:%s' % (proto,
                                             req.env.get('REMOTE_HOST', ''))
                     try:
                         ret = repo.addchangegroup(gen, 'serve', url)
                     except util.Abort, inst:
                         sys.stdout.write("abort: %s\n" % inst)
                         ret = 0
                 finally:
                     val = sys.stdout.getvalue()
                     sys.stdout, sys.stderr = oldio
                 req.respond(HTTP_OK, HGTYPE)
                 return '%d\n%s' % (ret, val),
             finally:
                 lock.release()
         except ValueError, inst:
             raise ErrorResponse(HTTP_OK, inst)
         except (OSError, IOError), inst:
             filename = getattr(inst, 'filename', '')
             # Don't send our filesystem layout to the client
             if filename.startswith(repo.root):
                 filename = filename[len(repo.root)+1:]
             else:
                 filename = ''
             error = getattr(inst, 'strerror', 'Unknown error')
             if inst.errno == errno.ENOENT:
                 code = HTTP_NOT_FOUND
             else:
                 code = HTTP_SERVER_ERROR
             raise ErrorResponse(code, '%s: %s' % (error, filename))
     finally:
         fp.close()
         os.unlink(tempname)
 
 def stream_out(repo, req):
     req.respond(HTTP_OK, HGTYPE)
     try:
         for chunk in streamclone.stream_out(repo, untrusted=True):
             yield chunk
     except streamclone.StreamException, inst:
         yield str(inst)

mercurial/localrepo.py

@@ -1,2074 +1,2074
 # localrepo.py - read/write repository class for mercurial
 #
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2, incorporated herein by reference.
 
 from node import bin, hex, nullid, nullrev, short
 from i18n import _
 import repo, changegroup
 import changelog, dirstate, filelog, manifest, context
 import lock, transaction, store, encoding
 import util, extensions, hook, error
 import match as match_
 import merge as merge_
 from lock import release
 import weakref, stat, errno, os, time, inspect
 propertycache = util.propertycache
 
 class localrepository(repo.repository):
-    capabilities = set(('lookup', 'changegroupsubset'))
+    capabilities = set(('lookup', 'changegroupsubset', 'branchmap'))
     supported = set('revlogv1 store fncache'.split())
 
     def __init__(self, baseui, path=None, create=0):
         repo.repository.__init__(self)
         self.root = os.path.realpath(path)
         self.path = os.path.join(self.root, ".hg")
         self.origroot = path
         self.opener = util.opener(self.path)
         self.wopener = util.opener(self.root)
 
         if not os.path.isdir(self.path):
             if create:
                 if not os.path.exists(path):
                     os.mkdir(path)
                 os.mkdir(self.path)
                 requirements = ["revlogv1"]
                 if baseui.configbool('format', 'usestore', True):
                     os.mkdir(os.path.join(self.path, "store"))
                     requirements.append("store")
                     if baseui.configbool('format', 'usefncache', True):
                         requirements.append("fncache")
                     # create an invalid changelog
                     self.opener("00changelog.i", "a").write(
                         '\0\0\0\2' # represents revlogv2
                         ' dummy changelog to prevent using the old repo layout'
                     )
                 reqfile = self.opener("requires", "w")
                 for r in requirements:
                     reqfile.write("%s\n" % r)
                 reqfile.close()
             else:
                 raise error.RepoError(_("repository %s not found") % path)
         elif create:
             raise error.RepoError(_("repository %s already exists") % path)
         else:
             # find requirements
             requirements = set()
             try:
                 requirements = set(self.opener("requires").read().splitlines())
             except IOError, inst:
                 if inst.errno != errno.ENOENT:
                     raise
             for r in requirements - self.supported:
                 raise error.RepoError(_("requirement '%s' not supported") % r)
 
         self.store = store.store(requirements, self.path, util.opener)
         self.spath = self.store.path
         self.sopener = self.store.opener
         self.sjoin = self.store.join
         self.opener.createmode = self.store.createmode
 
         self.baseui = baseui
         self.ui = baseui.copy()
         try:
             self.ui.readconfig(self.join("hgrc"), self.root)
             extensions.loadall(self.ui)
         except IOError:
             pass
 
         self.tagscache = None
         self._tagstypecache = None
         self.branchcache = None
         self._ubranchcache = None  # UTF-8 version of branchcache
         self._branchcachetip = None
         self.nodetagscache = None
         self.filterpats = {}
         self._datafilters = {}
         self._transref = self._lockref = self._wlockref = None
 
     @propertycache
     def changelog(self):
         c = changelog.changelog(self.sopener)
         if 'HG_PENDING' in os.environ:
             p = os.environ['HG_PENDING']
             if p.startswith(self.root):
                 c.readpending('00changelog.i.a')
         self.sopener.defversion = c.version
         return c
 
     @propertycache
     def manifest(self):
         return manifest.manifest(self.sopener)
 
     @propertycache
     def dirstate(self):
         return dirstate.dirstate(self.opener, self.ui, self.root)
 
     def __getitem__(self, changeid):
         if changeid is None:
             return context.workingctx(self)
         return context.changectx(self, changeid)
 
     def __nonzero__(self):
         return True
 
     def __len__(self):
         return len(self.changelog)
 
     def __iter__(self):
         for i in xrange(len(self)):
             yield i
 
     def url(self):
         return 'file:' + self.root
 
     def hook(self, name, throw=False, **args):
         return hook.hook(self.ui, self, name, throw, **args)
 
     tag_disallowed = ':\r\n'
 
     def _tag(self, names, node, message, local, user, date, extra={}):
         if isinstance(names, str):
             allchars = names
             names = (names,)
         else:
             allchars = ''.join(names)
         for c in self.tag_disallowed:
             if c in allchars:
                 raise util.Abort(_('%r cannot be used in a tag name') % c)
 
         for name in names:
             self.hook('pretag', throw=True, node=hex(node), tag=name,
                       local=local)
 
         def writetags(fp, names, munge, prevtags):
             fp.seek(0, 2)
             if prevtags and prevtags[-1] != '\n':
                 fp.write('\n')
             for name in names:
                 m = munge and munge(name) or name
                 if self._tagstypecache and name in self._tagstypecache:
                     old = self.tagscache.get(name, nullid)
                     fp.write('%s %s\n' % (hex(old), m))
                 fp.write('%s %s\n' % (hex(node), m))
             fp.close()
 
         prevtags = ''
         if local:
             try:
                 fp = self.opener('localtags', 'r+')
             except IOError:
                 fp = self.opener('localtags', 'a')
             else:
                 prevtags = fp.read()
 
             # local tags are stored in the current charset
             writetags(fp, names, None, prevtags)
             for name in names:
                 self.hook('tag', node=hex(node), tag=name, local=local)
             return
 
         try:
             fp = self.wfile('.hgtags', 'rb+')
         except IOError:
             fp = self.wfile('.hgtags', 'ab')
         else:
             prevtags = fp.read()
 
         # committed tags are stored in UTF-8
         writetags(fp, names, encoding.fromlocal, prevtags)
 
         if '.hgtags' not in self.dirstate:
             self.add(['.hgtags'])
 
         tagnode = self.commit(['.hgtags'], message, user, date, extra=extra)
 
         for name in names:
             self.hook('tag', node=hex(node), tag=name, local=local)
 
         return tagnode
 
     def tag(self, names, node, message, local, user, date):
         '''tag a revision with one or more symbolic names.
 
         names is a list of strings or, when adding a single tag, names may be a
         string.
 
         if local is True, the tags are stored in a per-repository file.
         otherwise, they are stored in the .hgtags file, and a new
         changeset is committed with the change.
 
         keyword arguments:
 
         local: whether to store tags in non-version-controlled file
         (default False)
 
         message: commit message to use if committing
 
         user: name of user to use if committing
 
         date: date tuple to use if committing'''
 
         for x in self.status()[:5]:
             if '.hgtags' in x:
                 raise util.Abort(_('working copy of .hgtags is changed '
                                    '(please commit .hgtags manually)'))
 
         self.tags() # instantiate the cache
         self._tag(names, node, message, local, user, date)
 
     def tags(self):
         '''return a mapping of tag to node'''
         if self.tagscache:
             return self.tagscache
 
         globaltags = {}
         tagtypes = {}
 
         def readtags(lines, fn, tagtype):
             filetags = {}
             count = 0
 
             def warn(msg):
                 self.ui.warn(_("%s, line %s: %s\n") % (fn, count, msg))
 
             for l in lines:
                 count += 1
                 if not l:
                     continue
                 s = l.split(" ", 1)
                 if len(s) != 2:
                     warn(_("cannot parse entry"))
                     continue
                 node, key = s
                 key = encoding.tolocal(key.strip()) # stored in UTF-8
                 try:
                     bin_n = bin(node)
                 except TypeError:
                     warn(_("node '%s' is not well formed") % node)
                     continue
                 if bin_n not in self.changelog.nodemap:
                     warn(_("tag '%s' refers to unknown node") % key)
                     continue
 
                 h = []
                 if key in filetags:
                     n, h = filetags[key]
                     h.append(n)
                 filetags[key] = (bin_n, h)
 
             for k, nh in filetags.iteritems():
                 if k not in globaltags:
                     globaltags[k] = nh
                     tagtypes[k] = tagtype
                     continue
 
                 # we prefer the global tag if:
                 #  it supercedes us OR
                 #  mutual supercedes and it has a higher rank
                 # otherwise we win because we're tip-most
                 an, ah = nh
                 bn, bh = globaltags[k]
                 if (bn != an and an in bh and
                     (bn not in ah or len(bh) > len(ah))):
                     an = bn
                 ah.extend([n for n in bh if n not in ah])
                 globaltags[k] = an, ah
                 tagtypes[k] = tagtype
 
         # read the tags file from each head, ending with the tip
         f = None
         for rev, node, fnode in self._hgtagsnodes():
             f = (f and f.filectx(fnode) or
                  self.filectx('.hgtags', fileid=fnode))
             readtags(f.data().splitlines(), f, "global")
 
         try:
             data = encoding.fromlocal(self.opener("localtags").read())
             # localtags are stored in the local character set
             # while the internal tag table is stored in UTF-8
             readtags(data.splitlines(), "localtags", "local")
         except IOError:
             pass
 
         self.tagscache = {}
         self._tagstypecache = {}
         for k, nh in globaltags.iteritems():
             n = nh[0]
             if n != nullid:
                 self.tagscache[k] = n
             self._tagstypecache[k] = tagtypes[k]
         self.tagscache['tip'] = self.changelog.tip()
         return self.tagscache
 
     def tagtype(self, tagname):
         '''
         return the type of the given tag. result can be:
 
         'local'  : a local tag
         'global' : a global tag
         None     : tag does not exist
         '''
 
         self.tags()
 
         return self._tagstypecache.get(tagname)
 
     def _hgtagsnodes(self):
         last = {}
         ret = []
         for node in reversed(self.heads()):
             c = self[node]
             rev = c.rev()
             try:
                 fnode = c.filenode('.hgtags')
             except error.LookupError:
                 continue
             ret.append((rev, node, fnode))
             if fnode in last:
                 ret[last[fnode]] = None
             last[fnode] = len(ret) - 1
         return [item for item in ret if item]
 
     def tagslist(self):
         '''return a list of tags ordered by revision'''
         l = []
         for t, n in self.tags().iteritems():
             try:
                 r = self.changelog.rev(n)
             except:
                 r = -2 # sort to the beginning of the list if unknown
             l.append((r, t, n))
         return [(t, n) for r, t, n in sorted(l)]
 
     def nodetags(self, node):
         '''return the tags associated with a node'''
         if not self.nodetagscache:
             self.nodetagscache = {}
             for t, n in self.tags().iteritems():
                 self.nodetagscache.setdefault(n, []).append(t)
         return self.nodetagscache.get(node, [])
 
     def _branchtags(self, partial, lrev):
         # TODO: rename this function?
         tiprev = len(self) - 1
         if lrev != tiprev:
             self._updatebranchcache(partial, lrev+1, tiprev+1)
             self._writebranchcache(partial, self.changelog.tip(), tiprev)
 
         return partial
 
-    def _branchheads(self):
+    def branchmap(self):
         tip = self.changelog.tip()
         if self.branchcache is not None and self._branchcachetip == tip:
             return self.branchcache
 
         oldtip = self._branchcachetip
         self._branchcachetip = tip
         if self.branchcache is None:
             self.branchcache = {} # avoid recursion in changectx
         else:
             self.branchcache.clear() # keep using the same dict
         if oldtip is None or oldtip not in self.changelog.nodemap:
             partial, last, lrev = self._readbranchcache()
         else:
             lrev = self.changelog.rev(oldtip)
             partial = self._ubranchcache
 
         self._branchtags(partial, lrev)
         # this private cache holds all heads (not just tips)
         self._ubranchcache = partial
 
         # the branch cache is stored on disk as UTF-8, but in the local
         # charset internally
         for k, v in partial.iteritems():
             self.branchcache[encoding.tolocal(k)] = v
         return self.branchcache
 
 
     def branchtags(self):
         '''return a dict where branch names map to the tipmost head of
         the branch, open heads come before closed'''
         bt = {}
-        for bn, heads in self._branchheads().iteritems():
+        for bn, heads in self.branchmap().iteritems():
             head = None
             for i in range(len(heads)-1, -1, -1):
                 h = heads[i]
                 if 'close' not in self.changelog.read(h)[5]:
                     head = h
                     break
             # no open heads were found
             if head is None:
                 head = heads[-1]
             bt[bn] = head
         return bt
 
 
     def _readbranchcache(self):
         partial = {}
         try:
             f = self.opener("branchheads.cache")
             lines = f.read().split('\n')
             f.close()
         except (IOError, OSError):
             return {}, nullid, nullrev
 
         try:
             last, lrev = lines.pop(0).split(" ", 1)
             last, lrev = bin(last), int(lrev)
             if lrev >= len(self) or self[lrev].node() != last:
                 # invalidate the cache
                 raise ValueError('invalidating branch cache (tip differs)')
             for l in lines:
                 if not l: continue
                 node, label = l.split(" ", 1)
                 partial.setdefault(label.strip(), []).append(bin(node))
         except KeyboardInterrupt:
             raise
         except Exception, inst:
             if self.ui.debugflag:
                 self.ui.warn(str(inst), '\n')
             partial, last, lrev = {}, nullid, nullrev
         return partial, last, lrev
 
     def _writebranchcache(self, branches, tip, tiprev):
         try:
             f = self.opener("branchheads.cache", "w", atomictemp=True)
             f.write("%s %s\n" % (hex(tip), tiprev))
             for label, nodes in branches.iteritems():
                 for node in nodes:
                     f.write("%s %s\n" % (hex(node), label))
             f.rename()
         except (IOError, OSError):
             pass
 
     def _updatebranchcache(self, partial, start, end):
         for r in xrange(start, end):
             c = self[r]
             b = c.branch()
             bheads = partial.setdefault(b, [])
             bheads.append(c.node())
             for p in c.parents():
                 pn = p.node()
                 if pn in bheads:
                     bheads.remove(pn)
 
     def lookup(self, key):
         if isinstance(key, int):
             return self.changelog.node(key)
         elif key == '.':
             return self.dirstate.parents()[0]
         elif key == 'null':
             return nullid
         elif key == 'tip':
             return self.changelog.tip()
         n = self.changelog._match(key)
         if n:
             return n
         if key in self.tags():
             return self.tags()[key]
         if key in self.branchtags():
             return self.branchtags()[key]
         n = self.changelog._partialmatch(key)
         if n:
             return n
         try:
             if len(key) == 20:
                 key = hex(key)
         except:
             pass
         raise error.RepoError(_("unknown revision '%s'") % key)
 
     def local(self):
         return True
 
     def join(self, f):
         return os.path.join(self.path, f)
 
     def wjoin(self, f):
         return os.path.join(self.root, f)
 
     def rjoin(self, f):
         return os.path.join(self.root, util.pconvert(f))
 
     def file(self, f):
         if f[0] == '/':
             f = f[1:]
         return filelog.filelog(self.sopener, f)
 
     def changectx(self, changeid):
         return self[changeid]
 
     def parents(self, changeid=None):
         '''get list of changectxs for parents of changeid'''
         return self[changeid].parents()
 
     def filectx(self, path, changeid=None, fileid=None):
         """changeid can be a changeset revision, node, or tag.
            fileid can be a file revision or node."""
         return context.filectx(self, path, changeid, fileid)
 
     def getcwd(self):
         return self.dirstate.getcwd()
 
     def pathto(self, f, cwd=None):
         return self.dirstate.pathto(f, cwd)
 
     def wfile(self, f, mode='r'):
         return self.wopener(f, mode)
 
     def _link(self, f):
         return os.path.islink(self.wjoin(f))
 
     def _filter(self, filter, filename, data):
         if filter not in self.filterpats:
             l = []
             for pat, cmd in self.ui.configitems(filter):
                 if cmd == '!':
                     continue
                 mf = util.matcher(self.root, "", [pat], [], [])[1]
                 fn = None
                 params = cmd
                 for name, filterfn in self._datafilters.iteritems():
                     if cmd.startswith(name):
                         fn = filterfn
                         params = cmd[len(name):].lstrip()
                         break
                 if not fn:
                     fn = lambda s, c, **kwargs: util.filter(s, c)
                 # Wrap old filters not supporting keyword arguments
                 if not inspect.getargspec(fn)[2]:
                     oldfn = fn
                     fn = lambda s, c, **kwargs: oldfn(s, c)
                 l.append((mf, fn, params))
             self.filterpats[filter] = l
 
         for mf, fn, cmd in self.filterpats[filter]:
             if mf(filename):
                 self.ui.debug(_("filtering %s through %s\n") % (filename, cmd))
                 data = fn(data, cmd, ui=self.ui, repo=self, filename=filename)
                 break
 
         return data
 
     def adddatafilter(self, name, filter):
         self._datafilters[name] = filter
 
     def wread(self, filename):
         if self._link(filename):
             data = os.readlink(self.wjoin(filename))
         else:
             data = self.wopener(filename, 'r').read()
         return self._filter("encode", filename, data)
 
     def wwrite(self, filename, data, flags):
         data = self._filter("decode", filename, data)
         try:
             os.unlink(self.wjoin(filename))
         except OSError:
             pass
         if 'l' in flags:
             self.wopener.symlink(data, filename)
         else:
             self.wopener(filename, 'w').write(data)
             if 'x' in flags:
                 util.set_flags(self.wjoin(filename), False, True)
 
     def wwritedata(self, filename, data):
         return self._filter("decode", filename, data)
 
     def transaction(self):
         tr = self._transref and self._transref() or None
         if tr and tr.running():
             return tr.nest()
 
         # abort here if the journal already exists
         if os.path.exists(self.sjoin("journal")):
             raise error.RepoError(_("journal already exists - run hg recover"))
 
         # save dirstate for rollback
         try:
             ds = self.opener("dirstate").read()
         except IOError:
             ds = ""
         self.opener("journal.dirstate", "w").write(ds)
         self.opener("journal.branch", "w").write(self.dirstate.branch())
 
         renames = [(self.sjoin("journal"), self.sjoin("undo")),
                    (self.join("journal.dirstate"), self.join("undo.dirstate")),
                    (self.join("journal.branch"), self.join("undo.branch"))]
         tr = transaction.transaction(self.ui.warn, self.sopener,
                                      self.sjoin("journal"),
                                      aftertrans(renames),
                                      self.store.createmode)
         self._transref = weakref.ref(tr)
         return tr
 
     def recover(self):
         lock = self.lock()
         try:
             if os.path.exists(self.sjoin("journal")):
                 self.ui.status(_("rolling back interrupted transaction\n"))
                 transaction.rollback(self.sopener, self.sjoin("journal"), self.ui.warn)
                 self.invalidate()
                 return True
             else:
                 self.ui.warn(_("no interrupted transaction available\n"))
                 return False
         finally:
             lock.release()
 
     def rollback(self):
         wlock = lock = None
         try:
             wlock = self.wlock()
             lock = self.lock()
             if os.path.exists(self.sjoin("undo")):
                 self.ui.status(_("rolling back last transaction\n"))
                 transaction.rollback(self.sopener, self.sjoin("undo"), self.ui.warn)
                 util.rename(self.join("undo.dirstate"), self.join("dirstate"))
                 try:
                     branch = self.opener("undo.branch").read()
                     self.dirstate.setbranch(branch)
                 except IOError:
                     self.ui.warn(_("Named branch could not be reset, "
                                    "current branch still is: %s\n")
                                  % encoding.tolocal(self.dirstate.branch()))
                 self.invalidate()
                 self.dirstate.invalidate()
             else:
                 self.ui.warn(_("no rollback information available\n"))
         finally:
             release(lock, wlock)
 
     def invalidate(self):
         for a in "changelog manifest".split():
             if a in self.__dict__:
                 delattr(self, a)
         self.tagscache = None
         self._tagstypecache = None
         self.nodetagscache = None
         self.branchcache = None
         self._ubranchcache = None
         self._branchcachetip = None
 
     def _lock(self, lockname, wait, releasefn, acquirefn, desc):
         try:
             l = lock.lock(lockname, 0, releasefn, desc=desc)
         except error.LockHeld, inst:
             if not wait:
                 raise
             self.ui.warn(_("waiting for lock on %s held by %r\n") %
                          (desc, inst.locker))
             # default to 600 seconds timeout
             l = lock.lock(lockname, int(self.ui.config("ui", "timeout", "600")),
                           releasefn, desc=desc)
         if acquirefn:
             acquirefn()
         return l
 
     def lock(self, wait=True):
         l = self._lockref and self._lockref()
         if l is not None and l.held:
             l.lock()
             return l
 
         l = self._lock(self.sjoin("lock"), wait, None, self.invalidate,
                        _('repository %s') % self.origroot)
         self._lockref = weakref.ref(l)
         return l
 
     def wlock(self, wait=True):
         l = self._wlockref and self._wlockref()
         if l is not None and l.held:
             l.lock()
             return l
 
         l = self._lock(self.join("wlock"), wait, self.dirstate.write,
                        self.dirstate.invalidate, _('working directory of %s') %
                        self.origroot)
         self._wlockref = weakref.ref(l)
         return l
 
     def _filecommit(self, fctx, manifest1, manifest2, linkrev, tr, changelist):
         """
         commit an individual file as part of a larger transaction
         """
 
         fname = fctx.path()
         text = fctx.data()
         flog = self.file(fname)
         fparent1 = manifest1.get(fname, nullid)
         fparent2 = fparent2o = manifest2.get(fname, nullid)
 
         meta = {}
         copy = fctx.renamed()
         if copy and copy[0] != fname:
             # Mark the new revision of this file as a copy of another
             # file.  This copy data will effectively act as a parent
             # of this new revision.  If this is a merge, the first
             # parent will be the nullid (meaning "look up the copy data")
             # and the second one will be the other parent.  For example:
             #
             # 0 --- 1 --- 3   rev1 changes file foo
             #   \       /     rev2 renames foo to bar and changes it
             #    \- 2 -/      rev3 should have bar with all changes and
             #                      should record that bar descends from
             #                      bar in rev2 and foo in rev1
             #
             # this allows this merge to succeed:
             #
             # 0 --- 1 --- 3   rev4 reverts the content change from rev2
             #   \       /     merging rev3 and rev4 should use bar@rev2
             #    \- 2 --- 4        as the merge base
             #
 
             cfname = copy[0]
             crev = manifest1.get(cfname)
             newfparent = fparent2
 
             if manifest2: # branch merge
                 if fparent2 == nullid or crev is None: # copied on remote side
                     if cfname in manifest2:
                         crev = manifest2[cfname]
                         newfparent = fparent1
 
             # find source in nearest ancestor if we've lost track
             if not crev:
                 self.ui.debug(_(" %s: searching for copy revision for %s\n") %
                               (fname, cfname))
                 for ancestor in self['.'].ancestors():
                     if cfname in ancestor:
                         crev = ancestor[cfname].filenode()
                         break
 
             self.ui.debug(_(" %s: copy %s:%s\n") % (fname, cfname, hex(crev)))
             meta["copy"] = cfname
             meta["copyrev"] = hex(crev)
             fparent1, fparent2 = nullid, newfparent
         elif fparent2 != nullid:
             # is one parent an ancestor of the other?
             fparentancestor = flog.ancestor(fparent1, fparent2)
             if fparentancestor == fparent1:
                 fparent1, fparent2 = fparent2, nullid
             elif fparentancestor == fparent2:
                 fparent2 = nullid
 
         # is the file changed?
         if fparent2 != nullid or flog.cmp(fparent1, text) or meta:
             changelist.append(fname)
             return flog.add(text, meta, tr, linkrev, fparent1, fparent2)
 
         # are just the flags changed during merge?
         if fparent1 !=  fparent2o and manifest1.flags(fname) != fctx.flags():
             changelist.append(fname)
 
         return fparent1
 
     def commit(self, files=None, text="", user=None, date=None, match=None,
                force=False, editor=False, extra={}):
         """Add a new revision to current repository.
 
         Revision information is gathered from the working directory, files and
         match can be used to filter the committed files.
         If editor is supplied, it is called to get a commit message.
         """
         wlock = self.wlock()
         try:
             p1, p2 = self.dirstate.parents()
 
             if (not force and p2 != nullid and match and
                 (match.files() or match.anypats())):
                 raise util.Abort(_('cannot partially commit a merge '
                                    '(do not specify files or patterns)'))
 
             if files:
                 modified, removed = [], []
                 for f in sorted(set(files)):
                     s = self.dirstate[f]
                     if s in 'nma':
                         modified.append(f)
                     elif s == 'r':
                         removed.append(f)
                     else:
                         self.ui.warn(_("%s not tracked!\n") % f)
                 changes = [modified, [], removed, [], []]
             else:
                 changes = self.status(match=match)
 
             if (not force and not extra.get("close") and p2 == nullid
                 and not (changes[0] or changes[1] or changes[2])
                 and self[None].branch() == self['.'].branch()):
                 self.ui.status(_("nothing changed\n"))
                 return None
 
             ms = merge_.mergestate(self)
             for f in changes[0]:
                 if f in ms and ms[f] == 'u':
                     raise util.Abort(_("unresolved merge conflicts "
                                                     "(see hg resolve)"))
 
             wctx = context.workingctx(self, (p1, p2), text, user, date,
                                       extra, changes)
             if editor:
                 wctx._text = editor(self, wctx,
                                     changes[1], changes[0], changes[2])
             ret = self.commitctx(wctx, True)
 
             # update dirstate and mergestate
             for f in changes[0] + changes[1]:
                 self.dirstate.normal(f)
             for f in changes[2]:
                 self.dirstate.forget(f)
             self.dirstate.setparents(ret)
             ms.reset()
 
             return ret
 
         finally:
             wlock.release()
 
     def commitctx(self, ctx, error=False):
         """Add a new revision to current repository.
 
         Revision information is passed via the context argument.
         """
 
         tr = lock = None
         removed = ctx.removed()
         p1, p2 = ctx.p1(), ctx.p2()
         m1 = p1.manifest().copy()
         m2 = p2.manifest()
         user = ctx.user()
 
         xp1, xp2 = p1.hex(), p2 and p2.hex() or ''
         self.hook("precommit", throw=True, parent1=xp1, parent2=xp2)
 
         lock = self.lock()
         try:
             tr = self.transaction()
             trp = weakref.proxy(tr)
 
             # check in files
             new = {}
             changed = []
             linkrev = len(self)
             for f in sorted(ctx.modified() + ctx.added()):
                 self.ui.note(f + "\n")
                 try:
                     fctx = ctx[f]
                     new[f] = self._filecommit(fctx, m1, m2, linkrev, trp,
                                               changed)
                     m1.set(f, fctx.flags())
                 except (OSError, IOError):
                     if error:
                         self.ui.warn(_("trouble committing %s!\n") % f)
                         raise
                     else:
                         removed.append(f)
 
             # update manifest
             m1.update(new)
             removed = [f for f in sorted(removed) if f in m1 or f in m2]
             drop = [f for f in removed if f in m1]
             for f in drop:
                 del m1[f]
             mn = self.manifest.add(m1, trp, linkrev, p1.manifestnode(),
                                    p2.manifestnode(), (new, drop))
 
             # update changelog
             self.changelog.delayupdate()
             n = self.changelog.add(mn, changed + removed, ctx.description(),
                                    trp, p1.node(), p2.node(),
                                    user, ctx.date(), ctx.extra().copy())
             p = lambda: self.changelog.writepending() and self.root or ""
             self.hook('pretxncommit', throw=True, node=hex(n), parent1=xp1,
                       parent2=xp2, pending=p)
             self.changelog.finalize(trp)
             tr.close()
 
             if self.branchcache:
                 self.branchtags()
 
             self.hook("commit", node=hex(n), parent1=xp1, parent2=xp2)
             return n
         finally:
             del tr
             lock.release()
 
     def walk(self, match, node=None):
         '''
         walk recursively through the directory tree or a given
         changeset, finding all files matched by the match
         function
         '''
         return self[node].walk(match)
 
     def status(self, node1='.', node2=None, match=None,
                ignored=False, clean=False, unknown=False):
         """return status of files between two nodes or node and working directory
 
         If node1 is None, use the first dirstate parent instead.
         If node2 is None, compare node1 with working directory.
         """
 
         def mfmatches(ctx):
             mf = ctx.manifest().copy()
             for fn in mf.keys():
                 if not match(fn):
                     del mf[fn]
             return mf
 
         if isinstance(node1, context.changectx):
             ctx1 = node1
         else:
             ctx1 = self[node1]
         if isinstance(node2, context.changectx):
             ctx2 = node2
         else:
             ctx2 = self[node2]
 
         working = ctx2.rev() is None
         parentworking = working and ctx1 == self['.']
         match = match or match_.always(self.root, self.getcwd())
         listignored, listclean, listunknown = ignored, clean, unknown
 
         # load earliest manifest first for caching reasons
         if not working and ctx2.rev() < ctx1.rev():
             ctx2.manifest()
 
         if not parentworking:
             def bad(f, msg):
                 if f not in ctx1:
                     self.ui.warn('%s: %s\n' % (self.dirstate.pathto(f), msg))
                 return False
             match.bad = bad
 
         if working: # we need to scan the working dir
             s = self.dirstate.status(match, listignored, listclean, listunknown)
             cmp, modified, added, removed, deleted, unknown, ignored, clean = s
 
             # check for any possibly clean files
             if parentworking and cmp:
                 fixup = []
                 # do a full compare of any files that might have changed
                 for f in sorted(cmp):
                     if (f not in ctx1 or ctx2.flags(f) != ctx1.flags(f)
                         or ctx1[f].cmp(ctx2[f].data())):
                         modified.append(f)
                     else:
                         fixup.append(f)
 
                 if listclean:
                     clean += fixup
 
                 # update dirstate for files that are actually clean
                 if fixup:
                     wlock = None
                     try:
                         try:
                             # updating the dirstate is optional
                             # so we don't wait on the lock
                             wlock = self.wlock(False)
                             for f in fixup:
                                 self.dirstate.normal(f)
                         except error.LockError:
                             pass
                     finally:
                         release(wlock)
 
         if not parentworking:
             mf1 = mfmatches(ctx1)
             if working:
                 # we are comparing working dir against non-parent
                 # generate a pseudo-manifest for the working dir
                 mf2 = mfmatches(self['.'])
                 for f in cmp + modified + added:
                     mf2[f] = None
                     mf2.set(f, ctx2.flags(f))
                 for f in removed:
                     if f in mf2:
                         del mf2[f]
             else:
                 # we are comparing two revisions
                 deleted, unknown, ignored = [], [], []
                 mf2 = mfmatches(ctx2)
 
             modified, added, clean = [], [], []
             for fn in mf2:
                 if fn in mf1:
                     if (mf1.flags(fn) != mf2.flags(fn) or
                         (mf1[fn] != mf2[fn] and
                          (mf2[fn] or ctx1[fn].cmp(ctx2[fn].data())))):
                         modified.append(fn)
                     elif listclean:
                         clean.append(fn)
                     del mf1[fn]
                 else:
                     added.append(fn)
             removed = mf1.keys()
 
         r = modified, added, removed, deleted, unknown, ignored, clean
         [l.sort() for l in r]
         return r
 
     def add(self, list):
         wlock = self.wlock()
         try:
             rejected = []
             for f in list:
                 p = self.wjoin(f)
                 try:
                     st = os.lstat(p)
                 except:
                     self.ui.warn(_("%s does not exist!\n") % f)
                     rejected.append(f)
                     continue
                 if st.st_size > 10000000:
                     self.ui.warn(_("%s: files over 10MB may cause memory and"
                                    " performance problems\n"
                                    "(use 'hg revert %s' to unadd the file)\n")
                                    % (f, f))
                 if not (stat.S_ISREG(st.st_mode) or stat.S_ISLNK(st.st_mode)):
                     self.ui.warn(_("%s not added: only files and symlinks "
                                    "supported currently\n") % f)
                     rejected.append(p)
                 elif self.dirstate[f] in 'amn':
                     self.ui.warn(_("%s already tracked!\n") % f)
                 elif self.dirstate[f] == 'r':
                     self.dirstate.normallookup(f)
                 else:
                     self.dirstate.add(f)
             return rejected
         finally:
             wlock.release()
 
     def forget(self, list):
         wlock = self.wlock()
         try:
             for f in list:
                 if self.dirstate[f] != 'a':
                     self.ui.warn(_("%s not added!\n") % f)
                 else:
                     self.dirstate.forget(f)
         finally:
             wlock.release()
 
     def remove(self, list, unlink=False):
         wlock = None
         try:
             if unlink:
                 for f in list:
                     try:
                         util.unlink(self.wjoin(f))
                     except OSError, inst:
                         if inst.errno != errno.ENOENT:
                             raise
             wlock = self.wlock()
             for f in list:
                 if unlink and os.path.exists(self.wjoin(f)):
                     self.ui.warn(_("%s still exists!\n") % f)
                 elif self.dirstate[f] == 'a':
                     self.dirstate.forget(f)
                 elif f not in self.dirstate:
                     self.ui.warn(_("%s not tracked!\n") % f)
                 else:
                     self.dirstate.remove(f)
         finally:
             release(wlock)
 
     def undelete(self, list):
         manifests = [self.manifest.read(self.changelog.read(p)[0])
                      for p in self.dirstate.parents() if p != nullid]
         wlock = self.wlock()
         try:
             for f in list:
                 if self.dirstate[f] != 'r':
                     self.ui.warn(_("%s not removed!\n") % f)
                 else:
                     m = f in manifests[0] and manifests[0] or manifests[1]
                     t = self.file(f).read(m[f])
                     self.wwrite(f, t, m.flags(f))
                     self.dirstate.normal(f)
         finally:
             wlock.release()
 
     def copy(self, source, dest):
         p = self.wjoin(dest)
         if not (os.path.exists(p) or os.path.islink(p)):
             self.ui.warn(_("%s does not exist!\n") % dest)
         elif not (os.path.isfile(p) or os.path.islink(p)):
             self.ui.warn(_("copy failed: %s is not a file or a "
                            "symbolic link\n") % dest)
         else:
             wlock = self.wlock()
             try:
                 if self.dirstate[dest] in '?r':
                     self.dirstate.add(dest)
                 self.dirstate.copy(source, dest)
             finally:
                 wlock.release()
 
     def heads(self, start=None, closed=True):
         heads = self.changelog.heads(start)
         def display(head):
             if closed:
                 return True
             extras = self.changelog.read(head)[5]
             return ('close' not in extras)
         # sort the output in rev descending order
         heads = [(-self.changelog.rev(h), h) for h in heads if display(h)]
         return [n for (r, n) in sorted(heads)]
 
     def branchheads(self, branch=None, start=None, closed=True):
         if branch is None:
             branch = self[None].branch()
-        branches = self._branchheads()
+        branches = self.branchmap()
         if branch not in branches:
             return []
         bheads = branches[branch]
         # the cache returns heads ordered lowest to highest
         bheads.reverse()
         if start is not None:
             # filter out the heads that cannot be reached from startrev
             bheads = self.changelog.nodesbetween([start], bheads)[2]
         if not closed:
             bheads = [h for h in bheads if
                       ('close' not in self.changelog.read(h)[5])]
         return bheads
 
     def branches(self, nodes):
         if not nodes:
             nodes = [self.changelog.tip()]
         b = []
         for n in nodes:
             t = n
             while 1:
                 p = self.changelog.parents(n)
                 if p[1] != nullid or p[0] == nullid:
                     b.append((t, n, p[0], p[1]))
                     break
                 n = p[0]
         return b
 
     def between(self, pairs):
         r = []
 
         for top, bottom in pairs:
             n, l, i = top, [], 0
             f = 1
 
             while n != bottom and n != nullid:
                 p = self.changelog.parents(n)[0]
                 if i == f:
                     l.append(n)
                     f = f * 2
                 n = p
                 i += 1
 
             r.append(l)
 
         return r
 
     def findincoming(self, remote, base=None, heads=None, force=False):
         """Return list of roots of the subsets of missing nodes from remote
 
         If base dict is specified, assume that these nodes and their parents
         exist on the remote side and that no child of a node of base exists
         in both remote and self.
         Furthermore base will be updated to include the nodes that exists
         in self and remote but no children exists in self and remote.
         If a list of heads is specified, return only nodes which are heads
         or ancestors of these heads.
 
         All the ancestors of base are in self and in remote.
         All the descendants of the list returned are missing in self.
         (and so we know that the rest of the nodes are missing in remote, see
         outgoing)
         """
         return self.findcommonincoming(remote, base, heads, force)[1]
 
     def findcommonincoming(self, remote, base=None, heads=None, force=False):
         """Return a tuple (common, missing roots, heads) used to identify
         missing nodes from remote.
 
         If base dict is specified, assume that these nodes and their parents
         exist on the remote side and that no child of a node of base exists
         in both remote and self.
         Furthermore base will be updated to include the nodes that exists
         in self and remote but no children exists in self and remote.
         If a list of heads is specified, return only nodes which are heads
         or ancestors of these heads.
 
         All the ancestors of base are in self and in remote.
         """
         m = self.changelog.nodemap
         search = []
         fetch = set()
         seen = set()
         seenbranch = set()
         if base is None:
             base = {}
 
         if not heads:
             heads = remote.heads()
 
         if self.changelog.tip() == nullid:
             base[nullid] = 1
             if heads != [nullid]:
                 return [nullid], [nullid], list(heads)
             return [nullid], [], []
 
         # assume we're closer to the tip than the root
         # and start by examining the heads
         self.ui.status(_("searching for changes\n"))
 
         unknown = []
         for h in heads:
             if h not in m:
                 unknown.append(h)
             else:
                 base[h] = 1
 
         heads = unknown
         if not unknown:
             return base.keys(), [], []
 
         req = set(unknown)
         reqcnt = 0
 
         # search through remote branches
         # a 'branch' here is a linear segment of history, with four parts:
         # head, root, first parent, second parent
         # (a branch always has two parents (or none) by definition)
         unknown = remote.branches(unknown)
         while unknown:
             r = []
             while unknown:
                 n = unknown.pop(0)
                 if n[0] in seen:
                     continue
 
                 self.ui.debug(_("examining %s:%s\n")
                               % (short(n[0]), short(n[1])))
                 if n[0] == nullid: # found the end of the branch
                     pass
                 elif n in seenbranch:
                     self.ui.debug(_("branch already found\n"))
                     continue
                 elif n[1] and n[1] in m: # do we know the base?
                     self.ui.debug(_("found incomplete branch %s:%s\n")
                                   % (short(n[0]), short(n[1])))
                     search.append(n[0:2]) # schedule branch range for scanning
                     seenbranch.add(n)
                 else:
                     if n[1] not in seen and n[1] not in fetch:
                         if n[2] in m and n[3] in m:
                             self.ui.debug(_("found new changeset %s\n") %
                                           short(n[1]))
                             fetch.add(n[1]) # earliest unknown
                         for p in n[2:4]:
                             if p in m:
                                 base[p] = 1 # latest known
 
                     for p in n[2:4]:
                         if p not in req and p not in m:
                             r.append(p)
                             req.add(p)
                 seen.add(n[0])
 
             if r:
                 reqcnt += 1
                 self.ui.debug(_("request %d: %s\n") %
                             (reqcnt, " ".join(map(short, r))))
                 for p in xrange(0, len(r), 10):
                     for b in remote.branches(r[p:p+10]):
                         self.ui.debug(_("received %s:%s\n") %
                                       (short(b[0]), short(b[1])))
                         unknown.append(b)
 
         # do binary search on the branches we found
         while search:
             newsearch = []
             reqcnt += 1
             for n, l in zip(search, remote.between(search)):
                 l.append(n[1])
                 p = n[0]
                 f = 1
                 for i in l:
                     self.ui.debug(_("narrowing %d:%d %s\n") % (f, len(l), short(i)))
                     if i in m:
                         if f <= 2:
                             self.ui.debug(_("found new branch changeset %s\n") %
                                               short(p))
                             fetch.add(p)
                             base[i] = 1
                         else:
                             self.ui.debug(_("narrowed branch search to %s:%s\n")
                                           % (short(p), short(i)))
                             newsearch.append((p, i))
                         break
                     p, f = i, f * 2
                 search = newsearch
 
         # sanity check our fetch list
         for f in fetch:
             if f in m:
                 raise error.RepoError(_("already have changeset ")
                                       + short(f[:4]))
 
         if base.keys() == [nullid]:
             if force:
                 self.ui.warn(_("warning: repository is unrelated\n"))
             else:
                 raise util.Abort(_("repository is unrelated"))
 
         self.ui.debug(_("found new changesets starting at ") +
                      " ".join([short(f) for f in fetch]) + "\n")
 
         self.ui.debug(_("%d total queries\n") % reqcnt)
 
         return base.keys(), list(fetch), heads
 
     def findoutgoing(self, remote, base=None, heads=None, force=False):
         """Return list of nodes that are roots of subsets not in remote
 
         If base dict is specified, assume that these nodes and their parents
         exist on the remote side.
         If a list of heads is specified, return only nodes which are heads
         or ancestors of these heads, and return a second element which
         contains all remote heads which get new children.
         """
         if base is None:
             base = {}
             self.findincoming(remote, base, heads, force=force)
 
         self.ui.debug(_("common changesets up to ")
                       + " ".join(map(short, base.keys())) + "\n")
 
         remain = set(self.changelog.nodemap)
 
         # prune everything remote has from the tree
         remain.remove(nullid)
         remove = base.keys()
         while remove:
             n = remove.pop(0)
             if n in remain:
                 remain.remove(n)
                 for p in self.changelog.parents(n):
                     remove.append(p)
 
         # find every node whose parents have been pruned
         subset = []
         # find every remote head that will get new children
         updated_heads = set()
         for n in remain:
             p1, p2 = self.changelog.parents(n)
             if p1 not in remain and p2 not in remain:
                 subset.append(n)
             if heads:
                 if p1 in heads:
                     updated_heads.add(p1)
                 if p2 in heads:
                     updated_heads.add(p2)
 
         # this is the set of all roots we have to push
         if heads:
             return subset, list(updated_heads)
         else:
             return subset
 
     def pull(self, remote, heads=None, force=False):
         lock = self.lock()
         try:
             common, fetch, rheads = self.findcommonincoming(remote, heads=heads,
                                                             force=force)
             if fetch == [nullid]:
                 self.ui.status(_("requesting all changes\n"))
 
             if not fetch:
                 self.ui.status(_("no changes found\n"))
                 return 0
 
             if heads is None and remote.capable('changegroupsubset'):
                 heads = rheads
 
             if heads is None:
                 cg = remote.changegroup(fetch, 'pull')
             else:
                 if not remote.capable('changegroupsubset'):
                     raise util.Abort(_("Partial pull cannot be done because other repository doesn't support changegroupsubset."))
                 cg = remote.changegroupsubset(fetch, heads, 'pull')
             return self.addchangegroup(cg, 'pull', remote.url())
         finally:
             lock.release()
 
     def push(self, remote, force=False, revs=None):
         # there are two ways to push to remote repo:
         #
         # addchangegroup assumes local user can lock remote
         # repo (local filesystem, old ssh servers).
         #
         # unbundle assumes local user cannot lock remote repo (new ssh
         # servers, http servers).
 
         if remote.capable('unbundle'):
             return self.push_unbundle(remote, force, revs)
         return self.push_addchangegroup(remote, force, revs)
 
     def prepush(self, remote, force, revs):
         common = {}
         remote_heads = remote.heads()
         inc = self.findincoming(remote, common, remote_heads, force=force)
 
         update, updated_heads = self.findoutgoing(remote, common, remote_heads)
         if revs is not None:
             msng_cl, bases, heads = self.changelog.nodesbetween(update, revs)
         else:
             bases, heads = update, self.changelog.heads()
 
         if not bases:
             self.ui.status(_("no changes found\n"))
             return None, 1
         elif not force:
             # check if we're creating new remote heads
             # to be a remote head after push, node must be either
             # - unknown locally
             # - a local outgoing head descended from update
             # - a remote head that's known locally and not
             #   ancestral to an outgoing head
 
             warn = 0
 
             if remote_heads == [nullid]:
                 warn = 0
             elif not revs and len(heads) > len(remote_heads):
                 warn = 1
             else:
                 newheads = list(heads)
                 for r in remote_heads:
                     if r in self.changelog.nodemap:
                         desc = self.changelog.heads(r, heads)
                         l = [h for h in heads if h in desc]
                         if not l:
                             newheads.append(r)
                     else:
                         newheads.append(r)
                 if len(newheads) > len(remote_heads):
                     warn = 1
 
             if warn:
                 self.ui.warn(_("abort: push creates new remote heads!\n"))
                 self.ui.status(_("(did you forget to merge?"
                                  " use push -f to force)\n"))
                 return None, 0
             elif inc:
                 self.ui.warn(_("note: unsynced remote changes!\n"))
 
 
         if revs is None:
             # use the fast path, no race possible on push
             cg = self._changegroup(common.keys(), 'push')
         else:
             cg = self.changegroupsubset(update, revs, 'push')
         return cg, remote_heads
 
     def push_addchangegroup(self, remote, force, revs):
         lock = remote.lock()
         try:
             ret = self.prepush(remote, force, revs)
             if ret[0] is not None:
                 cg, remote_heads = ret
                 return remote.addchangegroup(cg, 'push', self.url())
             return ret[1]
         finally:
             lock.release()
 
     def push_unbundle(self, remote, force, revs):
         # local repo finds heads on server, finds out what revs it
         # must push.  once revs transferred, if server finds it has
         # different heads (someone else won commit/push race), server
         # aborts.
 
         ret = self.prepush(remote, force, revs)
         if ret[0] is not None:
             cg, remote_heads = ret
             if force: remote_heads = ['force']
             return remote.unbundle(cg, remote_heads, 'push')
         return ret[1]
 
     def changegroupinfo(self, nodes, source):
         if self.ui.verbose or source == 'bundle':
             self.ui.status(_("%d changesets found\n") % len(nodes))
         if self.ui.debugflag:
             self.ui.debug(_("list of changesets:\n"))
             for node in nodes:
                 self.ui.debug("%s\n" % hex(node))
 
     def changegroupsubset(self, bases, heads, source, extranodes=None):
         """This function generates a changegroup consisting of all the nodes
         that are descendents of any of the bases, and ancestors of any of
         the heads.
 
         It is fairly complex as determining which filenodes and which
         manifest nodes need to be included for the changeset to be complete
         is non-trivial.
 
         Another wrinkle is doing the reverse, figuring out which changeset in
         the changegroup a particular filenode or manifestnode belongs to.
 
         The caller can specify some nodes that must be included in the
         changegroup using the extranodes argument.  It should be a dict
         where the keys are the filenames (or 1 for the manifest), and the
         values are lists of (node, linknode) tuples, where node is a wanted
         node and linknode is the changelog node that should be transmitted as
         the linkrev.
         """
 
         if extranodes is None:
             # can we go through the fast path ?
             heads.sort()
             allheads = self.heads()
             allheads.sort()
             if heads == allheads:
                 common = []
                 # parents of bases are known from both sides
                 for n in bases:
                     for p in self.changelog.parents(n):
                         if p != nullid:
                             common.append(p)
                 return self._changegroup(common, source)
 
         self.hook('preoutgoing', throw=True, source=source)
 
         # Set up some initial variables
         # Make it easy to refer to self.changelog
         cl = self.changelog
         # msng is short for missing - compute the list of changesets in this
         # changegroup.
         msng_cl_lst, bases, heads = cl.nodesbetween(bases, heads)
         self.changegroupinfo(msng_cl_lst, source)
         # Some bases may turn out to be superfluous, and some heads may be
         # too.  nodesbetween will return the minimal set of bases and heads
         # necessary to re-create the changegroup.
 
         # Known heads are the list of heads that it is assumed the recipient
         # of this changegroup will know about.
         knownheads = set()
         # We assume that all parents of bases are known heads.
         for n in bases:
             knownheads.update(cl.parents(n))
         knownheads.discard(nullid)
         knownheads = list(knownheads)
         if knownheads:
             # Now that we know what heads are known, we can compute which
             # changesets are known.  The recipient must know about all
             # changesets required to reach the known heads from the null
             # changeset.
             has_cl_set, junk, junk = cl.nodesbetween(None, knownheads)
             junk = None
             # Transform the list into a set.
             has_cl_set = set(has_cl_set)
         else:
             # If there were no known heads, the recipient cannot be assumed to
             # know about any changesets.
             has_cl_set = set()
 
         # Make it easy to refer to self.manifest
         mnfst = self.manifest
         # We don't know which manifests are missing yet
         msng_mnfst_set = {}
         # Nor do we know which filenodes are missing.
         msng_filenode_set = {}
 
         junk = mnfst.index[len(mnfst) - 1] # Get around a bug in lazyindex
         junk = None
 
         # A changeset always belongs to itself, so the changenode lookup
         # function for a changenode is identity.
         def identity(x):
             return x
 
         # A function generating function.  Sets up an environment for the
         # inner function.
         def cmp_by_rev_func(revlog):
             # Compare two nodes by their revision number in the environment's
             # revision history.  Since the revision number both represents the
             # most efficient order to read the nodes in, and represents a
             # topological sorting of the nodes, this function is often useful.
             def cmp_by_rev(a, b):
                 return cmp(revlog.rev(a), revlog.rev(b))
             return cmp_by_rev
 
         # If we determine that a particular file or manifest node must be a
         # node that the recipient of the changegroup will already have, we can
         # also assume the recipient will have all the parents.  This function
         # prunes them from the set of missing nodes.
         def prune_parents(revlog, hasset, msngset):
             haslst = list(hasset)
             haslst.sort(cmp_by_rev_func(revlog))
             for node in haslst:
                 parentlst = [p for p in revlog.parents(node) if p != nullid]
                 while parentlst:
                     n = parentlst.pop()
                     if n not in hasset:
                         hasset.add(n)
                         p = [p for p in revlog.parents(n) if p != nullid]
                         parentlst.extend(p)
             for n in hasset:
                 msngset.pop(n, None)
 
         # This is a function generating function used to set up an environment
         # for the inner function to execute in.
         def manifest_and_file_collector(changedfileset):
             # This is an information gathering function that gathers
             # information from each changeset node that goes out as part of
             # the changegroup.  The information gathered is a list of which
             # manifest nodes are potentially required (the recipient may
             # already have them) and total list of all files which were
             # changed in any changeset in the changegroup.
             #
             # We also remember the first changenode we saw any manifest
             # referenced by so we can later determine which changenode 'owns'
             # the manifest.
             def collect_manifests_and_files(clnode):
                 c = cl.read(clnode)
                 for f in c[3]:
                     # This is to make sure we only have one instance of each
                     # filename string for each filename.
                     changedfileset.setdefault(f, f)
                 msng_mnfst_set.setdefault(c[0], clnode)
             return collect_manifests_and_files
 
         # Figure out which manifest nodes (of the ones we think might be part
         # of the changegroup) the recipient must know about and remove them
         # from the changegroup.
         def prune_manifests():
             has_mnfst_set = set()
             for n in msng_mnfst_set:
                 # If a 'missing' manifest thinks it belongs to a changenode
                 # the recipient is assumed to have, obviously the recipient
                 # must have that manifest.
                 linknode = cl.node(mnfst.linkrev(mnfst.rev(n)))
                 if linknode in has_cl_set:
                     has_mnfst_set.add(n)
             prune_parents(mnfst, has_mnfst_set, msng_mnfst_set)
 
         # Use the information collected in collect_manifests_and_files to say
         # which changenode any manifestnode belongs to.
         def lookup_manifest_link(mnfstnode):
             return msng_mnfst_set[mnfstnode]
 
         # A function generating function that sets up the initial environment
         # the inner function.
         def filenode_collector(changedfiles):
             next_rev = [0]
             # This gathers information from each manifestnode included in the
             # changegroup about which filenodes the manifest node references
             # so we can include those in the changegroup too.
             #
             # It also remembers which changenode each filenode belongs to.  It
             # does this by assuming the a filenode belongs to the changenode
             # the first manifest that references it belongs to.
             def collect_msng_filenodes(mnfstnode):
                 r = mnfst.rev(mnfstnode)
                 if r == next_rev[0]:
                     # If the last rev we looked at was the one just previous,
                     # we only need to see a diff.
                     deltamf = mnfst.readdelta(mnfstnode)
                     # For each line in the delta
                     for f, fnode in deltamf.iteritems():
                         f = changedfiles.get(f, None)
                         # And if the file is in the list of files we care
                         # about.
                         if f is not None:
                             # Get the changenode this manifest belongs to
                             clnode = msng_mnfst_set[mnfstnode]
                             # Create the set of filenodes for the file if
                             # there isn't one already.
                             ndset = msng_filenode_set.setdefault(f, {})
                             # And set the filenode's changelog node to the
                             # manifest's if it hasn't been set already.
                             ndset.setdefault(fnode, clnode)
                 else:
                     # Otherwise we need a full manifest.
                     m = mnfst.read(mnfstnode)
                     # For every file in we care about.
                     for f in changedfiles:
                         fnode = m.get(f, None)
                         # If it's in the manifest
                         if fnode is not None:
                             # See comments above.
                             clnode = msng_mnfst_set[mnfstnode]
                             ndset = msng_filenode_set.setdefault(f, {})
                             ndset.setdefault(fnode, clnode)
                 # Remember the revision we hope to see next.
                 next_rev[0] = r + 1
             return collect_msng_filenodes
 
         # We have a list of filenodes we think we need for a file, lets remove
         # all those we know the recipient must have.
         def prune_filenodes(f, filerevlog):
             msngset = msng_filenode_set[f]
             hasset = set()
             # If a 'missing' filenode thinks it belongs to a changenode we
             # assume the recipient must have, then the recipient must have
             # that filenode.
             for n in msngset:
                 clnode = cl.node(filerevlog.linkrev(filerevlog.rev(n)))
                 if clnode in has_cl_set:
                     hasset.add(n)
             prune_parents(filerevlog, hasset, msngset)
 
         # A function generator function that sets up the a context for the
         # inner function.
         def lookup_filenode_link_func(fname):
             msngset = msng_filenode_set[fname]
             # Lookup the changenode the filenode belongs to.
             def lookup_filenode_link(fnode):
                 return msngset[fnode]
             return lookup_filenode_link
 
         # Add the nodes that were explicitly requested.
         def add_extra_nodes(name, nodes):
             if not extranodes or name not in extranodes:
                 return
 
             for node, linknode in extranodes[name]:
                 if node not in nodes:
                     nodes[node] = linknode
 
         # Now that we have all theses utility functions to help out and
         # logically divide up the task, generate the group.
         def gengroup():
             # The set of changed files starts empty.
             changedfiles = {}
             # Create a changenode group generator that will call our functions
             # back to lookup the owning changenode and collect information.
             group = cl.group(msng_cl_lst, identity,
                              manifest_and_file_collector(changedfiles))
             for chnk in group:
                 yield chnk
 
             # The list of manifests has been collected by the generator
             # calling our functions back.
             prune_manifests()
             add_extra_nodes(1, msng_mnfst_set)
             msng_mnfst_lst = msng_mnfst_set.keys()
             # Sort the manifestnodes by revision number.
             msng_mnfst_lst.sort(cmp_by_rev_func(mnfst))
             # Create a generator for the manifestnodes that calls our lookup
             # and data collection functions back.
             group = mnfst.group(msng_mnfst_lst, lookup_manifest_link,
                                 filenode_collector(changedfiles))
             for chnk in group:
                 yield chnk
 
             # These are no longer needed, dereference and toss the memory for
             # them.
             msng_mnfst_lst = None
             msng_mnfst_set.clear()
 
             if extranodes:
                 for fname in extranodes:
                     if isinstance(fname, int):
                         continue
                     msng_filenode_set.setdefault(fname, {})
                     changedfiles[fname] = 1
             # Go through all our files in order sorted by name.
             for fname in sorted(changedfiles):
                 filerevlog = self.file(fname)
                 if not len(filerevlog):
                     raise util.Abort(_("empty or missing revlog for %s") % fname)
                 # Toss out the filenodes that the recipient isn't really
                 # missing.
                 if fname in msng_filenode_set:
                     prune_filenodes(fname, filerevlog)
                     add_extra_nodes(fname, msng_filenode_set[fname])
                     msng_filenode_lst = msng_filenode_set[fname].keys()
                 else:
                     msng_filenode_lst = []
                 # If any filenodes are left, generate the group for them,
                 # otherwise don't bother.
                 if len(msng_filenode_lst) > 0:
                     yield changegroup.chunkheader(len(fname))
                     yield fname
                     # Sort the filenodes by their revision #
                     msng_filenode_lst.sort(cmp_by_rev_func(filerevlog))
                     # Create a group generator and only pass in a changenode
                     # lookup function as we need to collect no information
                     # from filenodes.
                     group = filerevlog.group(msng_filenode_lst,
                                              lookup_filenode_link_func(fname))
                     for chnk in group:
                         yield chnk
                 if fname in msng_filenode_set:
                     # Don't need this anymore, toss it to free memory.
                     del msng_filenode_set[fname]
             # Signal that no more groups are left.
             yield changegroup.closechunk()
 
             if msng_cl_lst:
                 self.hook('outgoing', node=hex(msng_cl_lst[0]), source=source)
 
         return util.chunkbuffer(gengroup())
 
     def changegroup(self, basenodes, source):
         # to avoid a race we use changegroupsubset() (issue1320)
         return self.changegroupsubset(basenodes, self.heads(), source)
 
     def _changegroup(self, common, source):
         """Generate a changegroup of all nodes that we have that a recipient
         doesn't.
 
         This is much easier than the previous function as we can assume that
         the recipient has any changenode we aren't sending them.
 
         common is the set of common nodes between remote and self"""
 
         self.hook('preoutgoing', throw=True, source=source)
 
         cl = self.changelog
         nodes = cl.findmissing(common)
         revset = set([cl.rev(n) for n in nodes])
         self.changegroupinfo(nodes, source)
 
         def identity(x):
             return x
 
         def gennodelst(log):
             for r in log:
                 if log.linkrev(r) in revset:
                     yield log.node(r)
 
         def changed_file_collector(changedfileset):
             def collect_changed_files(clnode):
                 c = cl.read(clnode)
                 changedfileset.update(c[3])
             return collect_changed_files
 
         def lookuprevlink_func(revlog):
             def lookuprevlink(n):
                 return cl.node(revlog.linkrev(revlog.rev(n)))
             return lookuprevlink
 
         def gengroup():
             # construct a list of all changed files
             changedfiles = set()
 
             for chnk in cl.group(nodes, identity,
                                  changed_file_collector(changedfiles)):
                 yield chnk
 
             mnfst = self.manifest
             nodeiter = gennodelst(mnfst)
             for chnk in mnfst.group(nodeiter, lookuprevlink_func(mnfst)):
                 yield chnk
 
             for fname in sorted(changedfiles):
                 filerevlog = self.file(fname)
                 if not len(filerevlog):
                     raise util.Abort(_("empty or missing revlog for %s") % fname)
                 nodeiter = gennodelst(filerevlog)
                 nodeiter = list(nodeiter)
                 if nodeiter:
                     yield changegroup.chunkheader(len(fname))
                     yield fname
                     lookup = lookuprevlink_func(filerevlog)
                     for chnk in filerevlog.group(nodeiter, lookup):
                         yield chnk
 
             yield changegroup.closechunk()
 
             if nodes:
                 self.hook('outgoing', node=hex(nodes[0]), source=source)
 
         return util.chunkbuffer(gengroup())
 
     def addchangegroup(self, source, srctype, url, emptyok=False):
         """add changegroup to repo.
 
         return values:
         - nothing changed or no source: 0
         - more heads than before: 1+added heads (2..n)
         - less heads than before: -1-removed heads (-2..-n)
         - number of heads stays the same: 1
         """
         def csmap(x):
             self.ui.debug(_("add changeset %s\n") % short(x))
             return len(cl)
 
         def revmap(x):
             return cl.rev(x)
 
         if not source:
             return 0
 
         self.hook('prechangegroup', throw=True, source=srctype, url=url)
 
         changesets = files = revisions = 0
 
         # write changelog data to temp files so concurrent readers will not see
         # inconsistent view
         cl = self.changelog
         cl.delayupdate()
         oldheads = len(cl.heads())
 
         tr = self.transaction()
         try:
             trp = weakref.proxy(tr)
             # pull off the changeset group
             self.ui.status(_("adding changesets\n"))
             clstart = len(cl)
             chunkiter = changegroup.chunkiter(source)
             if cl.addgroup(chunkiter, csmap, trp) is None and not emptyok:
                 raise util.Abort(_("received changelog group is empty"))
             clend = len(cl)
             changesets = clend - clstart
 
             # pull off the manifest group
             self.ui.status(_("adding manifests\n"))
             chunkiter = changegroup.chunkiter(source)
             # no need to check for empty manifest group here:
             # if the result of the merge of 1 and 2 is the same in 3 and 4,
             # no new manifest will be created and the manifest group will
             # be empty during the pull
             self.manifest.addgroup(chunkiter, revmap, trp)
 
             # process the files
             self.ui.status(_("adding file changes\n"))
             while 1:
                 f = changegroup.getchunk(source)
                 if not f:
                     break
                 self.ui.debug(_("adding %s revisions\n") % f)
                 fl = self.file(f)
                 o = len(fl)
                 chunkiter = changegroup.chunkiter(source)
                 if fl.addgroup(chunkiter, revmap, trp) is None:
                     raise util.Abort(_("received file revlog group is empty"))
                 revisions += len(fl) - o
                 files += 1
 
             newheads = len(cl.heads())
             heads = ""
             if oldheads and newheads != oldheads:
                 heads = _(" (%+d heads)") % (newheads - oldheads)
 
             self.ui.status(_("added %d changesets"
                              " with %d changes to %d files%s\n")
                              % (changesets, revisions, files, heads))
 
             if changesets > 0:
                 p = lambda: cl.writepending() and self.root or ""
                 self.hook('pretxnchangegroup', throw=True,
                           node=hex(cl.node(clstart)), source=srctype,
                           url=url, pending=p)
 
             # make changelog see real files again
             cl.finalize(trp)
 
             tr.close()
         finally:
             del tr
 
         if changesets > 0:
             # forcefully update the on-disk branch cache
             self.ui.debug(_("updating the branch cache\n"))
             self.branchtags()
             self.hook("changegroup", node=hex(cl.node(clstart)),
                       source=srctype, url=url)
 
             for i in xrange(clstart, clend):
                 self.hook("incoming", node=hex(cl.node(i)),
                           source=srctype, url=url)
 
         # never return 0 here:
         if newheads < oldheads:
             return newheads - oldheads - 1
         else:
             return newheads - oldheads + 1
 
 
     def stream_in(self, remote):
         fp = remote.stream_out()
         l = fp.readline()
         try:
             resp = int(l)
         except ValueError:
             raise error.ResponseError(
                 _('Unexpected response from remote server:'), l)
         if resp == 1:
             raise util.Abort(_('operation forbidden by server'))
         elif resp == 2:
             raise util.Abort(_('locking the remote repository failed'))
         elif resp != 0:
             raise util.Abort(_('the server sent an unknown error code'))
         self.ui.status(_('streaming all changes\n'))
         l = fp.readline()
         try:
             total_files, total_bytes = map(int, l.split(' ', 1))
         except (ValueError, TypeError):
             raise error.ResponseError(
                 _('Unexpected response from remote server:'), l)
         self.ui.status(_('%d files to transfer, %s of data\n') %
                        (total_files, util.bytecount(total_bytes)))
         start = time.time()
         for i in xrange(total_files):
             # XXX doesn't support '\n' or '\r' in filenames
             l = fp.readline()
             try:
                 name, size = l.split('\0', 1)
                 size = int(size)
             except (ValueError, TypeError):
                 raise error.ResponseError(
                     _('Unexpected response from remote server:'), l)
             self.ui.debug(_('adding %s (%s)\n') % (name, util.bytecount(size)))
             # for backwards compat, name was partially encoded
             ofp = self.sopener(store.decodedir(name), 'w')
             for chunk in util.filechunkiter(fp, limit=size):
                 ofp.write(chunk)
             ofp.close()
         elapsed = time.time() - start
         if elapsed <= 0:
             elapsed = 0.001
         self.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') %
                        (util.bytecount(total_bytes), elapsed,
                         util.bytecount(total_bytes / elapsed)))
         self.invalidate()
         return len(self.heads()) + 1
 
     def clone(self, remote, heads=[], stream=False):
         '''clone remote repository.
 
         keyword arguments:
         heads: list of revs to clone (forces use of pull)
         stream: use streaming clone if possible'''
 
         # now, all clients that can request uncompressed clones can
         # read repo formats supported by all servers that can serve
         # them.
 
         # if revlog format changes, client will have to check version
         # and format flags on "stream" capability, and use
         # uncompressed only if compatible.
 
         if stream and not heads and remote.capable('stream'):
             return self.stream_in(remote)
         return self.pull(remote, heads)
 
 # used to avoid circular references so destructors work
 def aftertrans(files):
     renamefiles = [tuple(t) for t in files]
     def a():
         for src, dest in renamefiles:
             util.rename(src, dest)
     return a
 
 def instance(ui, path, create):
     return localrepository(ui, util.drop_scheme('file', path), create)
 
 def islocal(path):
     return True

mercurial/sshserver.py

@@ -1,216 +1,225
 # sshserver.py - ssh protocol server support for mercurial
 #
 # Copyright 2005-2007 Matt Mackall <[e-mail]>
 # Copyright 2006 Vadim Gelfer <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2, incorporated herein by reference.
 
 from i18n import _
 from node import bin, hex
 import streamclone, util, hook
-import os, sys, tempfile
+import os, sys, tempfile, urllib
 
 class sshserver(object):
     def __init__(self, ui, repo):
         self.ui = ui
         self.repo = repo
         self.lock = None
         self.fin = sys.stdin
         self.fout = sys.stdout
 
         hook.redirect(True)
         sys.stdout = sys.stderr
 
         # Prevent insertion/deletion of CRs
         util.set_binary(self.fin)
         util.set_binary(self.fout)
 
     def getarg(self):
         argline = self.fin.readline()[:-1]
         arg, l = argline.split()
         val = self.fin.read(int(l))
         return arg, val
 
     def respond(self, v):
         self.fout.write("%d\n" % len(v))
         self.fout.write(v)
         self.fout.flush()
 
     def serve_forever(self):
         try:
             while self.serve_one(): pass
         finally:
             if self.lock is not None:
                 self.lock.release()
         sys.exit(0)
 
     def serve_one(self):
         cmd = self.fin.readline()[:-1]
         if cmd:
             impl = getattr(self, 'do_' + cmd, None)
             if impl: impl()
             else: self.respond("")
         return cmd != ''
 
     def do_lookup(self):
         arg, key = self.getarg()
         assert arg == 'key'
         try:
             r = hex(self.repo.lookup(key))
             success = 1
         except Exception,inst:
             r = str(inst)
             success = 0
         self.respond("%s %s\n" % (success, r))
 
+    def do_branchmap(self):
+        branchmap = self.repo.branchmap()
+        heads = []
+        for branch, nodes in branchmap.iteritems():
+            branchname = urllib.quote(branch)
+            branchnodes = [hex(node) for node in nodes]
+            heads.append('%s %s' % (branchname, ' '.join(branchnodes)))
+        self.respond('\n'.join(heads))
+
     def do_heads(self):
         h = self.repo.heads()
         self.respond(" ".join(map(hex, h)) + "\n")
 
     def do_hello(self):
         '''the hello command returns a set of lines describing various
         interesting things about the server, in an RFC822-like format.
         Currently the only one defined is "capabilities", which
         consists of a line in the form:
 
         capabilities: space separated list of tokens
         '''
 
-        caps = ['unbundle', 'lookup', 'changegroupsubset']
+        caps = ['unbundle', 'lookup', 'changegroupsubset', 'branchmap']
         if self.ui.configbool('server', 'uncompressed'):
             caps.append('stream=%d' % self.repo.changelog.version)
         self.respond("capabilities: %s\n" % (' '.join(caps),))
 
     def do_lock(self):
         '''DEPRECATED - allowing remote client to lock repo is not safe'''
 
         self.lock = self.repo.lock()
         self.respond("")
 
     def do_unlock(self):
         '''DEPRECATED'''
 
         if self.lock:
             self.lock.release()
         self.lock = None
         self.respond("")
 
     def do_branches(self):
         arg, nodes = self.getarg()
         nodes = map(bin, nodes.split(" "))
         r = []
         for b in self.repo.branches(nodes):
             r.append(" ".join(map(hex, b)) + "\n")
         self.respond("".join(r))
 
     def do_between(self):
         arg, pairs = self.getarg()
         pairs = [map(bin, p.split("-")) for p in pairs.split(" ")]
         r = []
         for b in self.repo.between(pairs):
             r.append(" ".join(map(hex, b)) + "\n")
         self.respond("".join(r))
 
     def do_changegroup(self):
         nodes = []
         arg, roots = self.getarg()
         nodes = map(bin, roots.split(" "))
 
         cg = self.repo.changegroup(nodes, 'serve')
         while True:
             d = cg.read(4096)
             if not d:
                 break
             self.fout.write(d)
 
         self.fout.flush()
 
     def do_changegroupsubset(self):
         argmap = dict([self.getarg(), self.getarg()])
         bases = [bin(n) for n in argmap['bases'].split(' ')]
         heads = [bin(n) for n in argmap['heads'].split(' ')]
 
         cg = self.repo.changegroupsubset(bases, heads, 'serve')
         while True:
             d = cg.read(4096)
             if not d:
                 break
             self.fout.write(d)
 
         self.fout.flush()
 
     def do_addchangegroup(self):
         '''DEPRECATED'''
 
         if not self.lock:
             self.respond("not locked")
             return
 
         self.respond("")
         r = self.repo.addchangegroup(self.fin, 'serve', self.client_url())
         self.respond(str(r))
 
     def client_url(self):
         client = os.environ.get('SSH_CLIENT', '').split(' ', 1)[0]
         return 'remote:ssh:' + client
 
     def do_unbundle(self):
         their_heads = self.getarg()[1].split()
 
         def check_heads():
             heads = map(hex, self.repo.heads())
             return their_heads == [hex('force')] or their_heads == heads
 
         # fail early if possible
         if not check_heads():
             self.respond(_('unsynced changes'))
             return
 
         self.respond('')
 
         # write bundle data to temporary file because it can be big
         tempname = fp = None
         try:
             fd, tempname = tempfile.mkstemp(prefix='hg-unbundle-')
             fp = os.fdopen(fd, 'wb+')
 
             count = int(self.fin.readline())
             while count:
                 fp.write(self.fin.read(count))
                 count = int(self.fin.readline())
 
             was_locked = self.lock is not None
             if not was_locked:
                 self.lock = self.repo.lock()
             try:
                 if not check_heads():
                     # someone else committed/pushed/unbundled while we
                     # were transferring data
                     self.respond(_('unsynced changes'))
                     return
                 self.respond('')
 
                 # push can proceed
 
                 fp.seek(0)
                 r = self.repo.addchangegroup(fp, 'serve', self.client_url())
                 self.respond(str(r))
             finally:
                 if not was_locked:
                     self.lock.release()
                     self.lock = None
         finally:
             if fp is not None:
                 fp.close()
             if tempname is not None:
                 os.unlink(tempname)
 
     def do_stream_out(self):
         try:
             for chunk in streamclone.stream_out(self.repo):
                 self.fout.write(chunk)
             self.fout.flush()
         except streamclone.StreamException, inst:
             self.fout.write(str(inst))
             self.fout.flush()

tests/test-hgweb-commands.out

@@ -1,988 +1,988
 % Set up the repo
 adding da/foo
 adding foo
 marked working directory as branch stable
 % Logs and changes
 200 Script output follows
 
 <?xml version="1.0" encoding="ascii"?>
 <feed xmlns="http://127.0.0.1/2005/Atom">
  <!-- Changelog -->
  <id>http://127.0.0.1/</id>
  <link rel="self" href="http://127.0.0.1/atom-log"/>
  <link rel="alternate" href="http://127.0.0.1/"/>
  <title>test Changelog</title>
  <updated>1970-01-01T00:00:00+00:00</updated>
 
  <entry>
   <title>branch</title>
   <id>http://127.0.0.1/#changeset-1d22e65f027e5a0609357e7d8e7508cd2ba5d2fe</id>
   <link href="http://127.0.0.1/rev/1d22e65f027e5a0609357e7d8e7508cd2ba5d2fe"/>
   <author>
    <name>test</name>
    <email>&#116;&#101;&#115;&#116;</email>
   </author>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="xhtml">
    <div xmlns="http://127.0.0.1/1999/xhtml">
     <pre xml:space="preserve">branch</pre>
    </div>
   </content>
  </entry>
  <entry>
   <title>Added tag 1.0 for changeset 2ef0ac749a14</title>
   <id>http://127.0.0.1/#changeset-a4f92ed23982be056b9852de5dfe873eaac7f0de</id>
   <link href="http://127.0.0.1/rev/a4f92ed23982be056b9852de5dfe873eaac7f0de"/>
   <author>
    <name>test</name>
    <email>&#116;&#101;&#115;&#116;</email>
   </author>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="xhtml">
    <div xmlns="http://127.0.0.1/1999/xhtml">
     <pre xml:space="preserve">Added tag 1.0 for changeset 2ef0ac749a14</pre>
    </div>
   </content>
  </entry>
  <entry>
   <title>base</title>
   <id>http://127.0.0.1/#changeset-2ef0ac749a14e4f57a5a822464a0902c6f7f448f</id>
   <link href="http://127.0.0.1/rev/2ef0ac749a14e4f57a5a822464a0902c6f7f448f"/>
   <author>
    <name>test</name>
    <email>&#116;&#101;&#115;&#116;</email>
   </author>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="xhtml">
    <div xmlns="http://127.0.0.1/1999/xhtml">
     <pre xml:space="preserve">base</pre>
    </div>
   </content>
  </entry>
 
 </feed>
 200 Script output follows
 
 <?xml version="1.0" encoding="ascii"?>
 <feed xmlns="http://127.0.0.1/2005/Atom">
  <!-- Changelog -->
  <id>http://127.0.0.1/</id>
  <link rel="self" href="http://127.0.0.1/atom-log"/>
  <link rel="alternate" href="http://127.0.0.1/"/>
  <title>test Changelog</title>
  <updated>1970-01-01T00:00:00+00:00</updated>
 
  <entry>
   <title>branch</title>
   <id>http://127.0.0.1/#changeset-1d22e65f027e5a0609357e7d8e7508cd2ba5d2fe</id>
   <link href="http://127.0.0.1/rev/1d22e65f027e5a0609357e7d8e7508cd2ba5d2fe"/>
   <author>
    <name>test</name>
    <email>&#116;&#101;&#115;&#116;</email>
   </author>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="xhtml">
    <div xmlns="http://127.0.0.1/1999/xhtml">
     <pre xml:space="preserve">branch</pre>
    </div>
   </content>
  </entry>
  <entry>
   <title>Added tag 1.0 for changeset 2ef0ac749a14</title>
   <id>http://127.0.0.1/#changeset-a4f92ed23982be056b9852de5dfe873eaac7f0de</id>
   <link href="http://127.0.0.1/rev/a4f92ed23982be056b9852de5dfe873eaac7f0de"/>
   <author>
    <name>test</name>
    <email>&#116;&#101;&#115;&#116;</email>
   </author>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="xhtml">
    <div xmlns="http://127.0.0.1/1999/xhtml">
     <pre xml:space="preserve">Added tag 1.0 for changeset 2ef0ac749a14</pre>
    </div>
   </content>
  </entry>
  <entry>
   <title>base</title>
   <id>http://127.0.0.1/#changeset-2ef0ac749a14e4f57a5a822464a0902c6f7f448f</id>
   <link href="http://127.0.0.1/rev/2ef0ac749a14e4f57a5a822464a0902c6f7f448f"/>
   <author>
    <name>test</name>
    <email>&#116;&#101;&#115;&#116;</email>
   </author>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="xhtml">
    <div xmlns="http://127.0.0.1/1999/xhtml">
     <pre xml:space="preserve">base</pre>
    </div>
   </content>
  </entry>
 
 </feed>
 200 Script output follows
 
 <?xml version="1.0" encoding="ascii"?>
 <feed xmlns="http://127.0.0.1/2005/Atom">
  <id>http://127.0.0.1/atom-log/tip/foo</id>
  <link rel="self" href="http://127.0.0.1/atom-log/tip/foo"/>
  <title>test: foo history</title>
  <updated>1970-01-01T00:00:00+00:00</updated>
 
  <entry>
   <title>base</title>
   <id>http://127.0.0.1/#changeset-2ef0ac749a14e4f57a5a822464a0902c6f7f448f</id>
   <link href="http://127.0.0.1/rev/2ef0ac749a14e4f57a5a822464a0902c6f7f448f"/>
   <author>
    <name>test</name>
    <email>&#116;&#101;&#115;&#116;</email>
   </author>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="xhtml">
    <div xmlns="http://127.0.0.1/1999/xhtml">
     <pre xml:space="preserve">base</pre>
    </div>
   </content>
  </entry>
 
 </feed>
 200 Script output follows
 
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
 <head>
 <link rel="icon" href="/static/hgicon.png" type="image/png" />
 <meta name="robots" content="index, nofollow" />
 <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
 
 <title>test: log</title>
 <link rel="alternate" type="application/atom+xml"
    href="/atom-log" title="Atom feed for test" />
 <link rel="alternate" type="application/rss+xml"
    href="/rss-log" title="RSS feed for test" />
 </head>
 <body>
 
 <div class="container">
 <div class="menu">
 <div class="logo">
 <a href="http://www.selenic.com/mercurial/">
 <img src="/static/hglogo.png" alt="mercurial" /></a>
 </div>
 <ul>
 <li class="active">log</li>
 <li><a href="/graph/1d22e65f027e">graph</a></li>
 <li><a href="/tags">tags</a></li>
 <li><a href="/branches">branches</a></li>
 </ul>
 <ul>
 <li><a href="/rev/1d22e65f027e">changeset</a></li>
 <li><a href="/file/1d22e65f027e">browse</a></li>
 </ul>
 <ul>
 
 </ul>
 </div>
 
 <div class="main">
 <h2><a href="/">test</a></h2>
 <h3>log</h3>
 
 <form class="search" action="/log">
 
 <p><input name="rev" id="search1" type="text" size="30" /></p>
 <div id="hint">find changesets by author, revision,
 files, or words in the commit message</div>
 </form>
 
 <div class="navigate">rev 2: <a href="/shortlog/2ef0ac749a14">(0)</a> <a href="/shortlog/tip">tip</a> </div>
 
 <table class="bigtable">
  <tr>
   <th class="age">age</th>
   <th class="author">author</th>
   <th class="description">description</th>
  </tr>
  <tr class="parity0">
   <td class="age">many years</td>
   <td class="author">test</td>
   <td class="description"><a href="/rev/1d22e65f027e">branch</a><span class="branchhead">stable</span> <span class="tag">tip</span> </td>
  </tr>
  <tr class="parity1">
   <td class="age">many years</td>
   <td class="author">test</td>
   <td class="description"><a href="/rev/a4f92ed23982">Added tag 1.0 for changeset 2ef0ac749a14</a><span class="branchhead">default</span> </td>
  </tr>
  <tr class="parity0">
   <td class="age">many years</td>
   <td class="author">test</td>
   <td class="description"><a href="/rev/2ef0ac749a14">base</a><span class="tag">1.0</span> </td>
  </tr>
 
 </table>
 
 <div class="navigate">rev 2: <a href="/shortlog/2ef0ac749a14">(0)</a> <a href="/shortlog/tip">tip</a> </div>
 </div>
 </div>
 
 
 
 </body>
 </html>
 
 200 Script output follows
 
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
 <head>
 <link rel="icon" href="/static/hgicon.png" type="image/png" />
 <meta name="robots" content="index, nofollow" />
 <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
 
 <title>test: 2ef0ac749a14</title>
 </head>
 <body>
 <div class="container">
 <div class="menu">
 <div class="logo">
 <a href="http://www.selenic.com/mercurial/">
 <img src="/static/hglogo.png" alt="mercurial" /></a>
 </div>
 <ul>
  <li><a href="/shortlog/2ef0ac749a14">log</a></li>
  <li><a href="/graph/2ef0ac749a14">graph</a></li>
  <li><a href="/tags">tags</a></li>
  <li><a href="/branches">branches</a></li>
 </ul>
 <ul>
  <li class="active">changeset</li>
  <li><a href="/raw-rev/2ef0ac749a14">raw</a></li>
  <li><a href="/file/2ef0ac749a14">browse</a></li>
 </ul>
 <ul>
  
 </ul>
 </div>
 
 <div class="main">
 
 <h2><a href="/">test</a></h2>
 <h3>changeset 0:2ef0ac749a14  <span class="tag">1.0</span> </h3>
 
 <form class="search" action="/log">
 
 <p><input name="rev" id="search1" type="text" size="30" /></p>
 <div id="hint">find changesets by author, revision,
 files, or words in the commit message</div>
 </form>
 
 <div class="description">base</div>
 
 <table id="changesetEntry">
 <tr>
  <th class="author">author</th>
  <td class="author">&#116;&#101;&#115;&#116;</td>
 </tr>
 <tr>
  <th class="date">date</th>
  <td class="date">Thu Jan 01 00:00:00 1970 +0000 (many years ago)</td></tr>
 <tr>
  <th class="author">parents</th>
  <td class="author"></td>
 </tr>
 <tr>
  <th class="author">children</th>
  <td class="author"> <a href="/rev/a4f92ed23982">a4f92ed23982</a></td>
 </tr>
 <tr>
  <th class="files">files</th>
  <td class="files"><a href="/file/2ef0ac749a14/da/foo">da/foo</a> <a href="/file/2ef0ac749a14/foo">foo</a> </td>
 </tr>
 </table>
 
 <div class="overflow">
 <div class="sourcefirst">   line diff</div>
 
 <div class="source bottomline parity0"><pre><a href="#l1.1" id="l1.1">     1.1</a> <span class="minusline">--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 </span><a href="#l1.2" id="l1.2">     1.2</a> <span class="plusline">+++ b/da/foo	Thu Jan 01 00:00:00 1970 +0000
 </span><a href="#l1.3" id="l1.3">     1.3</a> <span class="atline">@@ -0,0 +1,1 @@
 </span><a href="#l1.4" id="l1.4">     1.4</a> <span class="plusline">+foo
 </span></pre></div><div class="source bottomline parity1"><pre><a href="#l2.1" id="l2.1">     2.1</a> <span class="minusline">--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 </span><a href="#l2.2" id="l2.2">     2.2</a> <span class="plusline">+++ b/foo	Thu Jan 01 00:00:00 1970 +0000
 </span><a href="#l2.3" id="l2.3">     2.3</a> <span class="atline">@@ -0,0 +1,1 @@
 </span><a href="#l2.4" id="l2.4">     2.4</a> <span class="plusline">+foo
 </span></pre></div>
 </div>
 
 </div>
 </div>
 
 
 </body>
 </html>
 
 200 Script output follows
 
 
 # HG changeset patch
 # User test
 # Date 0 0
 # Node ID a4f92ed23982be056b9852de5dfe873eaac7f0de
 # Parent  2ef0ac749a14e4f57a5a822464a0902c6f7f448f
 Added tag 1.0 for changeset 2ef0ac749a14
 
 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 +++ b/.hgtags	Thu Jan 01 00:00:00 1970 +0000
 @@ -0,0 +1,1 @@
 +2ef0ac749a14e4f57a5a822464a0902c6f7f448f 1.0
 
 % File-related
 200 Script output follows
 
 foo
 200 Script output follows
 
 
 test@0: foo
 
 
 
 
 200 Script output follows
 
 
 drwxr-xr-x da
 -rw-r--r-- 45 .hgtags
 -rw-r--r-- 4 foo
 
 
 200 Script output follows
 
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
 <head>
 <link rel="icon" href="/static/hgicon.png" type="image/png" />
 <meta name="robots" content="index, nofollow" />
 <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
 
 <title>test: a4f92ed23982 foo</title>
 </head>
 <body>
 
 <div class="container">
 <div class="menu">
 <div class="logo">
 <a href="http://www.selenic.com/mercurial/">
 <img src="/static/hglogo.png" alt="mercurial" /></a>
 </div>
 <ul>
 <li><a href="/shortlog/a4f92ed23982">log</a></li>
 <li><a href="/graph/a4f92ed23982">graph</a></li>
 <li><a href="/tags">tags</a></li>
 <li><a href="/branches">branches</a></li>
 </ul>
 <ul>
 <li><a href="/rev/a4f92ed23982">changeset</a></li>
 <li><a href="/file/a4f92ed23982/">browse</a></li>
 </ul>
 <ul>
 <li class="active">file</li>
 <li><a href="/diff/a4f92ed23982/foo">diff</a></li>
 <li><a href="/annotate/a4f92ed23982/foo">annotate</a></li>
 <li><a href="/log/a4f92ed23982/foo">file log</a></li>
 <li><a href="/raw-file/a4f92ed23982/foo">raw</a></li>
 </ul>
 </div>
 
 <div class="main">
 <h2><a href="/">test</a></h2>
 <h3>view foo @ 1:a4f92ed23982</h3>
 
 <form class="search" action="/log">
 
 <p><input name="rev" id="search1" type="text" size="30" /></p>
 <div id="hint">find changesets by author, revision,
 files, or words in the commit message</div>
 </form>
 
 <div class="description">Added tag 1.0 for changeset 2ef0ac749a14</div>
 
 <table id="changesetEntry">
 <tr>
  <th class="author">author</th>
  <td class="author">&#116;&#101;&#115;&#116;</td>
 </tr>
 <tr>
  <th class="date">date</th>
  <td class="date">Thu Jan 01 00:00:00 1970 +0000 (many years ago)</td>
 </tr>
 <tr>
  <th class="author">parents</th>
  <td class="author"></td>
 </tr>
 <tr>
  <th class="author">children</th>
  <td class="author"><a href="/file/1d22e65f027e/foo">1d22e65f027e</a> </td>
 </tr>
 
 </table>
 
 <div class="overflow">
 <div class="sourcefirst"> line source</div>
 
 <div class="parity0 source"><a href="#l1" id="l1">     1</a> foo
 </div>
 <div class="sourcelast"></div>
 </div>
 </div>
 </div>
 
 
 
 </body>
 </html>
 
 200 Script output follows
 
 
 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 +++ b/foo	Thu Jan 01 00:00:00 1970 +0000
 @@ -0,0 +1,1 @@
 +foo
 
 
 
 
 % Overviews
 200 Script output follows
 
 <?xml version="1.0" encoding="ascii"?>
 <feed xmlns="http://127.0.0.1/2005/Atom">
  <id>http://127.0.0.1/</id>
  <link rel="self" href="http://127.0.0.1/atom-tags"/>
  <link rel="alternate" href="http://127.0.0.1/tags"/>
  <title>test: tags</title>
  <summary>test tag history</summary>
  <author><name>Mercurial SCM</name></author>
  <updated>1970-01-01T00:00:00+00:00</updated>
 
  <entry>
   <title>1.0</title>
   <link rel="alternate" href="http://127.0.0.1/rev/2ef0ac749a14e4f57a5a822464a0902c6f7f448f"/>
   <id>http://127.0.0.1/#tag-2ef0ac749a14e4f57a5a822464a0902c6f7f448f</id>
   <updated>1970-01-01T00:00:00+00:00</updated>
   <published>1970-01-01T00:00:00+00:00</published>
   <content type="text">1.0</content>
  </entry>
 
 </feed>
 200 Script output follows
 
 <?xml version="1.0" encoding="ascii"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://127.0.0.1/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://127.0.0.1/1999/xhtml" xml:lang="en-US" lang="en-US">
 <head>
 <link rel="icon" href="/static/hgicon.png" type="image/png" />
 <meta name="robots" content="index, nofollow"/>
 <link rel="stylesheet" href="/static/style-gitweb.css" type="text/css" />
 
 
 <title>test: Branches</title>
 <link rel="alternate" type="application/atom+xml"
    href="/atom-tags" title="Atom feed for test"/>
 <link rel="alternate" type="application/rss+xml"
    href="/rss-tags" title="RSS feed for test"/>
 </head>
 <body>
 
 <div class="page_header">
 <a href="http://127.0.0.1/mercurial/" title="Mercurial" style="float: right;">Mercurial</a><a href="/summary?style=gitweb">test</a> / branches
 </div>
 
 <div class="page_nav">
 <a href="/summary?style=gitweb">summary</a> |
 <a href="/shortlog?style=gitweb">shortlog</a> |
 <a href="/log?style=gitweb">changelog</a> |
 <a href="/graph?style=gitweb">graph</a> |
 <a href="/tags?style=gitweb">tags</a> |
 branches |
 <a href="/file/1d22e65f027e?style=gitweb">files</a>
 <br/>
 </div>
 
 <div class="title">&nbsp;</div>
 <table cellspacing="0">
 
 <tr class="parity0">
 <td class="age"><i>many years ago</i></td>
 <td><a class="list" href="/shortlog/1d22e65f027e?style=gitweb"><b>1d22e65f027e</b></a></td>
 <td>stable</td>
 <td class="link">
 <a href="/changeset/1d22e65f027e?style=gitweb">changeset</a> |
 <a href="/log/1d22e65f027e?style=gitweb">changelog</a> |
 <a href="/file/1d22e65f027e?style=gitweb">files</a>
 </td>
 </tr>
 <tr class="parity1">
 <td class="age"><i>many years ago</i></td>
 <td><a class="list" href="/shortlog/a4f92ed23982?style=gitweb"><b>a4f92ed23982</b></a></td>
 <td>default</td>
 <td class="link">
 <a href="/changeset/a4f92ed23982?style=gitweb">changeset</a> |
 <a href="/log/a4f92ed23982?style=gitweb">changelog</a> |
 <a href="/file/a4f92ed23982?style=gitweb">files</a>
 </td>
 </tr>
 </table>
 
 <div class="page_footer">
 <div class="page_footer_text">test</div>
 <div class="rss_logo">
 <a href="/rss-log">RSS</a>
 <a href="/atom-log">Atom</a>
 </div>
 <br />
 
 </div>
 </body>
 </html>
 
 200 Script output follows
 
 <?xml version="1.0" encoding="ascii"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
 <head>
 <link rel="icon" href="/static/hgicon.png" type="image/png" />
 <meta name="robots" content="index, nofollow"/>
 <link rel="stylesheet" href="/static/style-gitweb.css" type="text/css" />
 
 
 <title>test: Summary</title>
 <link rel="alternate" type="application/atom+xml"
    href="/atom-log" title="Atom feed for test"/>
 <link rel="alternate" type="application/rss+xml"
    href="/rss-log" title="RSS feed for test"/>
 </head>
 <body>
 
 <div class="page_header">
 <a href="http://www.selenic.com/mercurial/" title="Mercurial" style="float: right;">Mercurial</a><a href="/summary?style=gitweb">test</a> / summary
 
 <form action="/log">
 <input type="hidden" name="style" value="gitweb" />
 <div class="search">
 <input type="text" name="rev"  />
 </div>
 </form>
 </div>
 
 <div class="page_nav">
 summary |
 <a href="/shortlog?style=gitweb">shortlog</a> |
 <a href="/log?style=gitweb">changelog</a> |
 <a href="/graph?style=gitweb">graph</a> |
 <a href="/tags?style=gitweb">tags</a> |
 <a href="/branches?style=gitweb">branches</a> |
 <a href="/file/1d22e65f027e?style=gitweb">files</a>
 <br/>
 </div>
 
 <div class="title">&nbsp;</div>
 <table cellspacing="0">
 <tr><td>description</td><td>unknown</td></tr>
 <tr><td>owner</td><td>&#70;&#111;&#111;&#32;&#66;&#97;&#114;&#32;&#60;&#102;&#111;&#111;&#46;&#98;&#97;&#114;&#64;&#101;&#120;&#97;&#109;&#112;&#108;&#101;&#46;&#99;&#111;&#109;&#62;</td></tr>
 <tr><td>last change</td><td>Thu, 01 Jan 1970 00:00:00 +0000</td></tr>
 </table>
 
 <div><a  class="title" href="/shortlog?style=gitweb">changes</a></div>
 <table cellspacing="0">
 
 <tr class="parity0">
 <td class="age"><i>many years ago</i></td>
 <td><i>test</i></td>
 <td>
 <a class="list" href="/rev/1d22e65f027e?style=gitweb">
 <b>branch</b>
 <span class="logtags"><span class="branchtag" title="stable">stable</span> <span class="tagtag" title="tip">tip</span> </span>
 </a>
 </td>
 <td class="link" nowrap>
 <a href="/rev/1d22e65f027e?style=gitweb">changeset</a> |
 <a href="/file/1d22e65f027e?style=gitweb">files</a>
 </td>
 </tr>
 <tr class="parity1">
 <td class="age"><i>many years ago</i></td>
 <td><i>test</i></td>
 <td>
 <a class="list" href="/rev/a4f92ed23982?style=gitweb">
 <b>Added tag 1.0 for changeset 2ef0ac749a14</b>
 <span class="logtags"><span class="branchtag" title="default">default</span> </span>
 </a>
 </td>
 <td class="link" nowrap>
 <a href="/rev/a4f92ed23982?style=gitweb">changeset</a> |
 <a href="/file/a4f92ed23982?style=gitweb">files</a>
 </td>
 </tr>
 <tr class="parity0">
 <td class="age"><i>many years ago</i></td>
 <td><i>test</i></td>
 <td>
 <a class="list" href="/rev/2ef0ac749a14?style=gitweb">
 <b>base</b>
 <span class="logtags"><span class="tagtag" title="1.0">1.0</span> </span>
 </a>
 </td>
 <td class="link" nowrap>
 <a href="/rev/2ef0ac749a14?style=gitweb">changeset</a> |
 <a href="/file/2ef0ac749a14?style=gitweb">files</a>
 </td>
 </tr>
 <tr class="light"><td colspan="4"><a class="list" href="/shortlog?style=gitweb">...</a></td></tr>
 </table>
 
 <div><a class="title" href="/tags?style=gitweb">tags</a></div>
 <table cellspacing="0">
 
 <tr class="parity0">
 <td class="age"><i>many years ago</i></td>
 <td><a class="list" href="/rev/2ef0ac749a14?style=gitweb"><b>1.0</b></a></td>
 <td class="link">
 <a href="/rev/2ef0ac749a14?style=gitweb">changeset</a> |
 <a href="/log/2ef0ac749a14?style=gitweb">changelog</a> |
 <a href="/file/2ef0ac749a14?style=gitweb">files</a>
 </td>
 </tr>
 <tr class="light"><td colspan="3"><a class="list" href="/tags?style=gitweb">...</a></td></tr>
 </table>
 
 <div><a class="title" href="#">branches</a></div>
 <table cellspacing="0">
 
 <tr class="parity0">
 <td class="age"><i>many years ago</i></td>
 <td><a class="list" href="/shortlog/1d22e65f027e?style=gitweb"><b>1d22e65f027e</b></a></td>
 <td>stable</td>
 <td class="link">
 <a href="/changeset/1d22e65f027e?style=gitweb">changeset</a> |
 <a href="/log/1d22e65f027e?style=gitweb">changelog</a> |
 <a href="/file/1d22e65f027e?style=gitweb">files</a>
 </td>
 </tr>
 <tr class="parity1">
 <td class="age"><i>many years ago</i></td>
 <td><a class="list" href="/shortlog/a4f92ed23982?style=gitweb"><b>a4f92ed23982</b></a></td>
 <td>default</td>
 <td class="link">
 <a href="/changeset/a4f92ed23982?style=gitweb">changeset</a> |
 <a href="/log/a4f92ed23982?style=gitweb">changelog</a> |
 <a href="/file/a4f92ed23982?style=gitweb">files</a>
 </td>
 </tr>
 <tr class="light">
   <td colspan="4"><a class="list"  href="#">...</a></td>
 </tr>
 </table>
 <div class="page_footer">
 <div class="page_footer_text">test</div>
 <div class="rss_logo">
 <a href="/rss-log">RSS</a>
 <a href="/atom-log">Atom</a>
 </div>
 <br />
 
 </div>
 </body>
 </html>
 
 200 Script output follows
 
 <?xml version="1.0" encoding="ascii"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US">
 <head>
 <link rel="icon" href="/static/hgicon.png" type="image/png" />
 <meta name="robots" content="index, nofollow"/>
 <link rel="stylesheet" href="/static/style-gitweb.css" type="text/css" />
 
 
 <title>test: Graph</title>
 <link rel="alternate" type="application/atom+xml"
    href="/atom-log" title="Atom feed for test"/>
 <link rel="alternate" type="application/rss+xml"
    href="/rss-log" title="RSS feed for test"/>
 <!--[if IE]><script type="text/javascript" src="/static/excanvas.js"></script><![endif]-->
 </head>
 <body>
 
 <div class="page_header">
 <a href="http://www.selenic.com/mercurial/" title="Mercurial" style="float: right;">Mercurial</a><a href="/summary?style=gitweb">test</a> / graph
 </div>
 
 <form action="/log">
 <input type="hidden" name="style" value="gitweb" />
 <div class="search">
 <input type="text" name="rev"  />
 </div>
 </form>
 <div class="page_nav">
 <a href="/summary?style=gitweb">summary</a> |
 <a href="/shortlog?style=gitweb">shortlog</a> |
 <a href="/log/2?style=gitweb">changelog</a> |
 graph |
 <a href="/tags?style=gitweb">tags</a> |
 <a href="/branches?style=gitweb">branches</a> |
 <a href="/file/1d22e65f027e?style=gitweb">files</a>
 <br/>
 <a href="/graph/2?style=gitweb&revcount=12">less</a>
 <a href="/graph/2?style=gitweb&revcount=50">more</a>
 | <a href="/graph/2ef0ac749a14?style=gitweb">(0)</a> <a href="/graph/2ef0ac749a14?style=gitweb">-2</a> <a href="/graph/tip?style=gitweb">tip</a> <br/>
 </div>
 
 <div class="title">&nbsp;</div>
 
 <noscript>The revision graph only works with JavaScript-enabled browsers.</noscript>
 
 <div id="wrapper">
 <ul id="nodebgs"></ul>
 <canvas id="graph" width="224" height="129"></canvas>
 <ul id="graphnodes"></ul>
 </div>
 
 <script type="text/javascript" src="/static/graph.js"></script>
 <script>
 <!-- hide script content
 
 var data = [["1d22e65f027e", [0, 1], [[0, 0, 1]], "branch", "test", "many years", ["stable", true], ["tip"]], ["a4f92ed23982", [0, 1], [[0, 0, 1]], "Added tag 1.0 for changeset 2ef0ac749a14", "test", "many years", ["default", true], []], ["2ef0ac749a14", [0, 1], [], "base", "test", "many years", ["default", false], ["1.0"]]];
 var graph = new Graph();
 graph.scale(39);
 
 graph.edge = function(x0, y0, x1, y1, color) {
 	
 	this.setColor(color, 0.0, 0.65);
 	this.ctx.beginPath();
 	this.ctx.moveTo(x0, y0);
 	this.ctx.lineTo(x1, y1);
 	this.ctx.stroke();
 	
 }
 
 var revlink = '<li style="_STYLE"><span class="desc">';
 revlink += '<a class="list" href="/rev/_NODEID?style=gitweb" title="_NODEID"><b>_DESC</b></a>';
 revlink += '</span> _TAGS';
 revlink += '<span class="info">_DATE ago, by _USER</span></li>';
 
 graph.vertex = function(x, y, color, parity, cur) {
 	
 	this.ctx.beginPath();
 	color = this.setColor(color, 0.25, 0.75);
 	this.ctx.arc(x, y, radius, 0, Math.PI * 2, true);
 	this.ctx.fill();
 	
 	var bg = '<li class="bg parity' + parity + '"></li>';
 	var left = (this.columns + 1) * this.bg_height;
 	var nstyle = 'padding-left: ' + left + 'px;';
 	var item = revlink.replace(/_STYLE/, nstyle);
 	item = item.replace(/_PARITY/, 'parity' + parity);
 	item = item.replace(/_NODEID/, cur[0]);
 	item = item.replace(/_NODEID/, cur[0]);
 	item = item.replace(/_DESC/, cur[3]);
 	item = item.replace(/_USER/, cur[4]);
 	item = item.replace(/_DATE/, cur[5]);
 	
 	var tagspan = '';
 	if (cur[7].length || (cur[6][0] != 'default' || cur[6][1])) {
 		tagspan = '<span class="logtags">';
 		if (cur[6][1]) {
 			tagspan += '<span class="branchtag" title="' + cur[6][0] + '">';
 			tagspan += cur[6][0] + '</span> ';
 		} else if (!cur[6][1] && cur[6][0] != 'default') {
 			tagspan += '<span class="inbranchtag" title="' + cur[6][0] + '">';
 			tagspan += cur[6][0] + '</span> ';
 		}
 		if (cur[7].length) {
 			for (var t in cur[7]) {
 				var tag = cur[7][t];
 				tagspan += '<span class="tagtag">' + tag + '</span> ';
 			}
 		}
 		tagspan += '</span>';
 	}
 	
 	item = item.replace(/_TAGS/, tagspan);
 	return [bg, item];
 	
 }
 
 graph.render(data);
 
 // stop hiding script -->
 </script>
 
 <div class="page_nav">
 <a href="/graph/2?style=gitweb&revcount=12">less</a>
 <a href="/graph/2?style=gitweb&revcount=50">more</a>
 | <a href="/graph/2ef0ac749a14?style=gitweb">(0)</a> <a href="/graph/2ef0ac749a14?style=gitweb">-2</a> <a href="/graph/tip?style=gitweb">tip</a> 
 </div>
 
 <div class="page_footer">
 <div class="page_footer_text">test</div>
 <div class="rss_logo">
 <a href="/rss-log">RSS</a>
 <a href="/atom-log">Atom</a>
 </div>
 <br />
 
 </div>
 </body>
 </html>
 
 % capabilities
 200 Script output follows
 
-lookup changegroupsubset unbundle=HG10GZ,HG10BZ,HG10UN% heads
+lookup changegroupsubset branchmap unbundle=HG10GZ,HG10BZ,HG10UN% heads
 200 Script output follows
 
 1d22e65f027e5a0609357e7d8e7508cd2ba5d2fe
 % lookup
 200 Script output follows
 
 0 'key'
 % branches
 200 Script output follows
 
 1d22e65f027e5a0609357e7d8e7508cd2ba5d2fe 2ef0ac749a14e4f57a5a822464a0902c6f7f448f 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000
 % changegroup
 200 Script output follows
 
 x\x9c\xbdTMHUA\x14\xbe\xa8\xf9\xec\xda&\x10\x11*\xb8\x88\x81\x99\xbef\xe6\xce\xbdw\xc6\xf2a\x16E\x1b\x11[%\x98\xcc\xaf\x8f\x8c\xf7\xc0\xf7\x82
 4\x11KP2m\x95\xad*\xabE\x05AP\xd0\xc22Z\x14\xf9\x03\xb9j\xa3\x9b$\xa4MJ\xb4\x90\xc0\x9a\x9bO0\x10\xdf\x13\xa2\x81\x0f\x869g\xe6|\xe7\x9c\xef\x8ceY\xf7\xa2KO\xd2\xb7K\x16~\
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 % stream_out
 200 Script output follows
 
 1
 % failing unbundle, requires POST request
 405 Method Not Allowed
 
 0
 push requires POST request
 % Static files
 200 Script output follows
 
 a { text-decoration:none; }
 .age { white-space:nowrap; }
 .date { white-space:nowrap; }
 .indexlinks { white-space:nowrap; }
 .parity0 { background-color: #ddd; }
 .parity1 { background-color: #eee; }
 .lineno { width: 60px; color: #aaa; font-size: smaller;
           text-align: right; }
 .plusline { color: green; }
 .minusline { color: red; }
 .atline { color: purple; }
 .annotate { font-size: smaller; text-align: right; padding-right: 1em; }
 .buttons a {
   background-color: #666;
   padding: 2pt;
   color: white;
   font-family: sans;
   font-weight: bold;
 }
 .navigate a {
   background-color: #ccc;
   padding: 2pt;
   font-family: sans;
   color: black;
 }
 
 .metatag {
   background-color: #888;
   color: white;
   text-align: right;
 }
 
 /* Common */
 pre { margin: 0; }
 
 .logo {
   float: right;
   clear: right;
 }
 
 /* Changelog/Filelog entries */
 .logEntry { width: 100%; }
 .logEntry .age { width: 15%; }
 .logEntry th { font-weight: normal; text-align: right; vertical-align: top; }
 .logEntry th.age, .logEntry th.firstline { font-weight: bold; }
 .logEntry th.firstline { text-align: left; width: inherit; }
 
 /* Shortlog entries */
 .slogEntry { width: 100%; }
 .slogEntry .age { width: 8em; }
 .slogEntry td { font-weight: normal; text-align: left; vertical-align: top; }
 .slogEntry td.author { width: 15em; }
 
 /* Tag entries */
 #tagEntries { list-style: none; margin: 0; padding: 0; }
 #tagEntries .tagEntry { list-style: none; margin: 0; padding: 0; }
 
 /* Changeset entry */
 #changesetEntry { }
 #changesetEntry th { font-weight: normal; background-color: #888; color: #fff; text-align: right; }
 #changesetEntry th.files, #changesetEntry th.description { vertical-align: top; }
 
 /* File diff view */
 #filediffEntry { }
 #filediffEntry th { font-weight: normal; background-color: #888; color: #fff; text-align: right; }
 
 /* Graph */
 div#wrapper {
 	position: relative;
 	margin: 0;
 	padding: 0;
 }
 
 canvas {
 	position: absolute;
 	z-index: 5;
 	top: -0.6em;
 	margin: 0;
 }
 
 ul#nodebgs {
 	list-style: none inside none;
 	padding: 0;
 	margin: 0;
 	top: -0.7em;
 }
 
 ul#graphnodes li, ul#nodebgs li {
 	height: 39px;
 }
 
 ul#graphnodes {
 	position: absolute;
 	z-index: 10;
 	top: -0.85em;
 	list-style: none inside none;
 	padding: 0;
 }
 
 ul#graphnodes li .info {
 	display: block;
 	font-size: 70%;
 	position: relative;
 	top: -1px;
 }
 % ERRORS ENCOUNTERED