Duplicate of issue1175, closing

+1 - I was just about to report this.

There is a simple way to recover, however:
$ hg qnew X
$ hg qren X Y
$ cd .hg/patches
$ hg commit  # fails
$ hg revert Y
$ hg add Y
$ hg commit  # works

(Assuming that you did "hg qinit -c"; this bug report seems to concern the case
where the mq directory isn't under hg control.)

Correcting title.

I probably introduced that with http://hg.intevation.org/mercurial/rev/93e140dbcd44.

I still believe my fix is correct, this is an MQ bug.

Thanks.  I wasn't aware that I had to turn git diffs on.  Thank God I had a backup 
of the repository since I haven't so far been able to recover it.

For one thing, you must have git diffs enabled for qrefresh to pick up on
renames. Though it still shouldn't die in such an ugly way.

The mq extension seems to corrupt the repository when trying to refresh a patch 
after having renamed files.  Here are the steps to reproduce this error:

gn@quintus:~/test$ hg init
gn@quintus:~/test$ hg qinit
gn@quintus:~/test$ hg qnew test.patch
gn@quintus:~/test$ echo "Hello, World" > test
gn@quintus:~/test$ hg add test
gn@quintus:~/test$ hg qrefresh
gn@quintus:~/test$ hg rename test old_test
gn@quintus:~/test$ hg qrefresh
** unknown exception encountered, details follow
** report bug details to http://www.selenic.com/mercurial/bts
** or mercurial@selenic.com
** Mercurial Distributed SCM (version 1.0.1)
Traceback (most recent call last):
  File "/usr/local/bin/hg", line 20, in ?
    mercurial.dispatch.run()
  File "/usr/local/lib/python2.4/site-packages/mercurial/dispatch.py", line 20, 
in run
    sys.exit(dispatch(sys.argv[1:]))
  File "/usr/local/lib/python2.4/site-packages/mercurial/dispatch.py", line 29, 
in dispatch
    return _runcatch(u, args)
  File "/usr/local/lib/python2.4/site-packages/mercurial/dispatch.py", line 45, 
in _runcatch
    return _dispatch(ui, args)
  File "/usr/local/lib/python2.4/site-packages/mercurial/dispatch.py", line 364, 
in _dispatch
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/local/lib/python2.4/site-packages/mercurial/dispatch.py", line 417, 
in _runcommand
    return checkargs()
  File "/usr/local/lib/python2.4/site-packages/mercurial/dispatch.py", line 373, 
in checkargs
    return cmdfunc()
  File "/usr/local/lib/python2.4/site-packages/mercurial/dispatch.py", line 356, 
in <lambda>
    d = lambda: func(ui, repo, *args, **cmdoptions)
  File "/usr/local/lib/python2.4/site-packages/hgext/mq.py", line 1743, in 
refresh
    ret = q.refresh(repo, pats, msg=message, **opts)
  File "/usr/local/lib/python2.4/site-packages/hgext/mq.py", line 1150, in 
refresh
    force=1)
  File "/usr/local/lib/python2.4/site-packages/hgext/mq.py", line 2189, in 
commit
    return super(mqrepo, self).commit(*args, **opts)
  File "/usr/local/lib/python2.4/site-packages/mercurial/localrepo.py", line 
832, in commit
    new[f] = self.filecommit(f, m1, m2, linkrev, trp, changed)
  File "/usr/local/lib/python2.4/site-packages/mercurial/localrepo.py", line 
712, in filecommit
    meta["copyrev"] = hex(manifest1[cp])
KeyError: 'test'
gn@quintus:~/test$ hg revert --all
abort: 00changelog.i@54387fe543f0: no node!
gn@quintus:~/test$ hg qrefresh
abort: 00changelog.i@54387fe543f0: no node!
gn@quintus:~/test$ hg qpop -f
abort: 00changelog.i@54387fe543f0: no node!
gn@quintus:~/test$ hg --version
Mercurial Distributed SCM (version 1.0.1)

Copyright (C) 2005-2008 Matt Mackall <mpm@selenic.com> and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
gn@quintus:~/test$

Obviously the repository remains in an unusable state.

This behaviour occurs on Linux, Windows and Mac OS.