[merge-package] ERROR: exceptions.ValueError: Cannot have multiple roots.

[Andrew Starr-Bochicchio]

Attempting:

bzr branch lp:ubuntu/qbzr
cd qbzr
bzr merge-package lp:debian/sid/qbzr

Results in:

 Traceback (most recent call last):
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 842, in exception_to_return_code
     return the_callable(*args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 1037, in run_bzr
     ret = run(*run_argv)
   File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 654, in run_argv_aliases
     return self.run(**all_cmd_args)
   File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/builddeb/cmds.py", line 911, in run
     fix_ancestry_as_needed(tree, source_branch)
   File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/builddeb/merge_package.py", line 144, in fix_ancestry_as_needed
     None, source.repository.revision_tree(us_revid))
   File "/usr/lib/python2.6/dist-packages/bzrlib/mutabletree.py", line 53, in tree_write_locked
     return unbound(self, *args, **kwargs)
   File "/usr/lib/python2.6/dist-packages/bzrlib/workingtree.py", line 2067, in revert
     report_changes)
   File "/usr/lib/python2.6/dist-packages/bzrlib/transform.py", line 2478, in revert
     working_tree, target_tree, tt, filenames, backups, pp)
   File "/usr/lib/python2.6/dist-packages/bzrlib/transform.py", line 2505, in _prepare_revert_transform
     merge_modified, basis_tree)
   File "/usr/lib/python2.6/dist-packages/bzrlib/transform.py", line 2607, in _alter_files
     tt.adjust_path(name[1], parent_trans, trans_id)
   File "/usr/lib/python2.6/dist-packages/bzrlib/transform.py", line 1101, in adjust_path
     TreeTransformBase.adjust_path(self, name, parent, trans_id)
   File "/usr/lib/python2.6/dist-packages/bzrlib/transform.py", line 170, in adjust_path
     raise ValueError("Cannot have multiple roots.")
 ValueError: Cannot have multiple roots.

[Colin Watson (cjwatson)]

I'm seeing the same thing with vim. Crash file attached.

[Michael Bienia (geser)]

Bug #490039 mentions the same error message, don't know if they are related.

[Colin Watson (cjwatson)]

They are indeed. Following the dup chain, I applied the patch from bug 494269 to bzr (2.0.3) and that fixed the problem. Feel free to mark this bug as another duplicate if that's appropriate.