[Bug 3578] New: Exception on clone with update

[bugzilla-daemon at bz.selenic.com]

http://bz.selenic.com/show_bug.cgi?id=3578

          Priority: normal
            Bug ID: 3578
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: Exception on clone with update
          Severity: bug
    Classification: Unclassified
                OS: Linux
          Reporter: zerkms at zerkms.ru
          Hardware: PC
            Status: UNCONFIRMED
           Version: 2.3
         Component: Mercurial
           Product: Mercurial

$ hg clone http://server/repo qqq -u "v4.1.1_RC2"
requesting all changes
adding changesets
adding manifests
adding file changes
added 64 changesets with 2835 changes to 1978 files
** Unknown exception encountered with possibly-broken third-party extension
mercurial_keyring
** which supports versions unknown of Mercurial.
** Please disable mercurial_keyring and try your action again.
** If that fixes the bug please report it to the extension author.
** Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) [GCC 4.4.3]
** Mercurial Distributed SCM (version 2.3)
** Extensions loaded: mercurial_keyring
Traceback (most recent call last):
  File "/usr/bin/hg", line 38, in <module>
    mercurial.dispatch.run()
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 28, in run
    sys.exit((dispatch(request(sys.argv[1:])) or 0) & 255)
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 65, in
dispatch
    return _runcatch(req)
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 88, in
_runcatch
    return _dispatch(req)
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 740, in
_dispatch
    cmdpats, cmdoptions)
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 514, in
runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 830, in
_runcommand
    return checkargs()
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 801, in
checkargs
    return cmdfunc()
  File "/usr/lib/pymodules/python2.6/mercurial/dispatch.py", line 737, in
<lambda>
    d = lambda: util.checksignature(func)(ui, *args, **cmdoptions)
  File "/usr/lib/pymodules/python2.6/mercurial/util.py", line 472, in check
    return func(*args, **kwargs)
  File "/usr/lib/pymodules/python2.6/mercurial/commands.py", line 1206, in
clone
    branch=opts.get('branch'))
  File "/usr/lib/pymodules/python2.6/mercurial/hg.py", line 401, in clone
    checkout = srcrepo.lookup(update)
AttributeError: 'NoneType' object has no attribute 'lookup'

On windows the issue isn't reproducible

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