Update fails if branch is empty

[André Bachmann]

I'm using bzr 2.3.3-3 and Win7 32 Bit.

I did the following:

1) run "bzr branch trunk neu -r 0" to create a new branch with no content
2) cd neu
3) bzr update

The result:

================================================
bzr: ERROR: exceptions.ValueError: WorkingTree.set_root_id with fileid=None

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 926, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1126, in run_bzr
  File "bzrlib\commands.pyo", line 691, in run_argv_aliases
  File "bzrlib\commands.pyo", line 713, in run
  File "bzrlib\cleanup.pyo", line 135, in run_simple
  File "bzrlib\cleanup.pyo", line 165, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 1433, in run
  File "bzrlib\workingtree.pyo", line 2312, in update
  File "bzrlib\mutabletree.pyo", line 50, in tree_write_locked
  File "bzrlib\workingtree.pyo", line 2369, in _update_tree
  File "bzrlib\mutabletree.pyo", line 50, in tree_write_locked
  File "bzrlib\workingtree.pyo", line 2225, in set_root_id
ValueError: WorkingTree.set_root_id with fileid=None

bzr 2.3.3 on python 2.6.6 (Windows-7-6.1.7601-SP1)
arguments: ['bzr', 'update']
plugins: bzrtools[2.3.1], colo[0.2.1], explorer[1.1.3], fastimport[0.10.0],
    launchpad[2.3.3], loom[2.2.1dev], netrc_credential_store[2.3.3],
    news_merge[2.3.3], pipeline[1.1.0], qbzr[0.20.1], rewrite[0.6.2dev],
    svn[1.0.5dev], upload[1.0.0], xmloutput[0.8.7.dev]
encoding: 'cp1252', fsenc: 'mbcs', lang: None

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.
================================================

And this is in my .bzr.log:

================================================
Thu 2011-06-30 10:37:22 +0200
0.089 bazaar version: 2.3.3
0.089 bzr arguments: [u'update']
0.130 looking for plugins in C:/Users/abachmann/AppData/Roaming/bazaar/2.0/plugins
0.131 looking for plugins in C:/Program Files/Bazaar/plugins
0.375 encoding stdout as sys.stdout encoding 'cp850'
0.435 opening working tree 'E:/Project/neu'
0.473 Transferred: 0kB (0.0kB/s r:0kB w:0kB)
0.474 Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 926, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1126, in run_bzr
  File "bzrlib\commands.pyo", line 691, in run_argv_aliases
  File "bzrlib\commands.pyo", line 713, in run
  File "bzrlib\cleanup.pyo", line 135, in run_simple
  File "bzrlib\cleanup.pyo", line 165, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 1433, in run
  File "bzrlib\workingtree.pyo", line 2312, in update
  File "bzrlib\mutabletree.pyo", line 50, in tree_write_locked
  File "bzrlib\workingtree.pyo", line 2369, in _update_tree
  File "bzrlib\mutabletree.pyo", line 50, in tree_write_locked
  File "bzrlib\workingtree.pyo", line 2225, in set_root_id
ValueError: WorkingTree.set_root_id with fileid=None

0.477 couldn't find apport bug-reporting library: No module named apport
0.518 Traceback (most recent call last):
  File "bzrlib\plugin.pyo", line 553, in _get__version__
  File "bzrlib\__init__.pyo", line 101, in _format_version_tuple
IndexError: tuple index out of range

0.524 return code 4
================================================

I'm not quite sure if this is the same error from bug #785377, because I did not use merge before, but branch.

[Martin Packman (gz)]

Yes, it's the same error, branch is using the same code underneath. If you like, try the same thing in the latest beta, you should get a clear error message rather than a traceback because bug 242175 has landed.