bzr push to SVN: 'NoneType' object has no attribute 'changes_branch_root'

[Rafael Viotti]

Pushing a new bzr branch to the tags directory of a SVN repo raised the exception below.

$ cd /srv/bzr/bzr-shared-repo
$ mkdir -p tags
$ bzr branch -r tag:0.1.0 trunk tags/0.1.0
$ cd tags/0.1.0
$ bzr push https://<email address hidden>/svn/tags/0.1.0

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 729, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 924, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 560, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 1076, in run
    use_existing_dir=use_existing_dir)
  File "/usr/lib/python2.5/site-packages/bzrlib/push.py", line 128, in _show_push_branch
    remember)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/remote.py", line 256, in push_branch
    ret.target_branch = self.import_branch(source, revision_id)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/remote.py", line 203, in import_branch
    push_merged=_push_merged)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/push.py", line 348, in push_new_branch
    override_svn_revprops=override_svn_revprops)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/push.py", line 291, in push_new
    target_branch_path, revid, set_metadata=True, deletefirst=None)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/push.py", line 494, in create_branch_with_hidden_commit
    fileprops = dict(revmeta.get_fileprops().iteritems())
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/revmeta.py", line 218, in get_fileprops
    while (not lm.changes_branch_root() and lm._fileprops is None and
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 1.15rc1 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'push', 'https://<email address hidden>/svn/tags/0.1.0']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [1.15rc1]
  netrc_credential_store /usr/lib/python2.5/site-packages/bzrlib/plugins/netrc_credential_store [1.15rc1]
  svn /usr/lib/python2.5/site-packages/bzrlib/plugins/svn [0.6]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.

I fixed this exception by doing the following change to revmeta.py, but I don't know if this is semantically correct:

 --- revmeta.py 2009-05-24 19:19:57.000000000 -0300
 +++ revmeta.mine.py 2009-05-24 19:20:42.000000000 -0300
 @@ -218,7 +218,12 @@
              while (not lm.changes_branch_root() and lm._fileprops is None and
                     len(todo) < MAX_FILEPROP_SHARED):
                  todo.add(lm)
 - lm = lm.get_direct_lhs_parent_revmeta()
 + next = lm.get_direct_lhs_parent_revmeta()
 + if next:
 + lm = next
 + else:
 + break
 +
              if lm._fileprops is None:
                  lm._fileprops = self._get_fileprops_fn(lm.branch_path,
                                                         lm.revnum)

[Jelmer Vernooij (jelmer)]

I think this is fixed in 0.6.1 already, any chance you can try with that? This particular bug is a side-effect of another bug that was fixed in 0.6.1

[Rafael Viotti (viotti)]

I just tested the same push operation with release 0.6.1 of bzr-svn. The error persists.

[Deeksy (cdekievit)]

Just to note that I have had this issue with bzr-svn 0.6.4 running a bzr update from a subversion repository.

[Arnaud Jeansen (ajeans)]

Also here, but on a simple update (after a push to SVN though)

$ bzr update
bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 842, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1037, in run_bzr
  File "bzrlib\commands.pyo", line 654, in run_argv_aliases
  File "bzrlib\builtins.pyo", line 1413, in run
  File "bzrlib\workingtree.pyo", line 2213, in update
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\branch.pyo", line 2437, in update
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\branch.pyo", line 948, in pull
  File "C:/Program Files/Bazaar/plugins\svn\branch.py", line 714, in pull
  File "C:/Program Files/Bazaar/plugins\svn\repository.py", line 931, in _get_revmeta
  File "C:/Program Files/Bazaar/plugins\svn\repository.py", line 1015, in lookup_revision_id
  File "C:/Program Files/Bazaar/plugins\svn\revids.py", line 265, in get_branch_revnum
  File "C:/Program Files/Bazaar/plugins\svn\revids.py", line 144, in bisect_revid_revnum
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 270, in get_changed_fileprops
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 263, in get_previous_fileprops
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 218, in get_fileprops
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 2.0.0 on python 2.5.4 (Windows-XP-5.1.2600-SP2)
arguments: ['c:\\Program Files\\Bazaar\\bzr.exe', 'update']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [2.0.0]
  explorer C:\Program Files\Bazaar\plugins\explorer [0.8.2]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [2.0.0]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [2.0.0]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.14.2]
  rebase C:\Program Files\Bazaar\plugins\rebase [0.5.3]
  svn C:\Program Files\Bazaar\plugins\svn [1.0.0]
  upload C:\Program Files\Bazaar\plugins\upload [1.0.0dev]
  xmloutput C:\Program Files\Bazaar\plugins\xmloutput [0.8.5]

*** 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.

[Matthäus G. Chajdas (anteru)]

Have the same issue here, getting an exception when updating from SVN. Seems to be triggered by some revisions, as I can update on another machine.

bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 842, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1037, in run_bzr
  File "bzrlib\commands.pyo", line 654, in run_argv_aliases
  File "C:/Program Files (x86)/Bazaar/plugins\qbzr\lib\commands.py", line 776, in run
  File "bzrlib\commands.pyo", line 1037, in run_bzr
  File "bzrlib\commands.pyo", line 654, in run_argv_aliases
  File "bzrlib\builtins.pyo", line 1017, in run
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\workingtree.pyo", line 1611, in pull
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\branch.pyo", line 948, in pull
  File "C:/Program Files (x86)/Bazaar/plugins\svn\branch.py", line 730, in pull
  File "C:/Program Files (x86)/Bazaar/plugins\svn\branch.py", line 665, in update_revisions
  File "C:/Program Files (x86)/Bazaar/plugins\svn\fetch.py", line 1279, in fetch
  File "C:/Program Files (x86)/Bazaar/plugins\svn\fetch.py", line 1209, in _fetch_revisions
  File "C:/Program Files (x86)/Bazaar/plugins\svn\fetch.py", line 1154, in _fetch_revision_switch
  File "C:/Program Files (x86)/Bazaar/plugins\svn\errors.py", line 137, in convert
  File "C:/Program Files (x86)/Bazaar/plugins\svn\fetch.py", line 920, in report_inventory_contents
  File "C:/Program Files (x86)/Bazaar/plugins\svn\transport.py", line 192, in update
  File "C:/Program Files (x86)/Bazaar/plugins\svn\transport.py", line 192, in update
  File "C:/Program Files (x86)/Bazaar/plugins\svn\transport.py", line 192, in update
  File "C:/Program Files (x86)/Bazaar/plugins\svn\transport.py", line 192, in update
  File "C:/Program Files (x86)/Bazaar/plugins\svn\fetch.py", line 316, in change_prop
  File "C:/Program Files (x86)/Bazaar/plugins\svn\revmeta.py", line 263, in get_previous_fileprops
  File "C:/Program Files (x86)/Bazaar/plugins\svn\revmeta.py", line 218, in get_fileprops
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 2.0.1 on python 2.5.4 (Windows-Vista-6.1.7600)
arguments: ['C:\\Program Files (x86)\\Bazaar\\bzr.exe', 'qsubprocess', '"pull" "svn://10.1.1.1/proj/trunk" "--directory" "D:/Dev/Current/proj/trunk" "--remember"']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files (x86)\Bazaar\plugins\bzrtools [2.0.1]
  explorer C:\Program Files (x86)\Bazaar\plugins\explorer [0.8.3]
  fastimport C:\Users\Anteru\AppData\Roaming\bazaar\2.0\plugins\fastimport [0.9.0dev]
  launchpad C:\Program Files (x86)\Bazaar\plugins\launchpad [2.0.1]
  netrc_credential_store C:\Program Files (x86)\Bazaar\plugins\netrc_credential_store [2.0.1]
  qbzr C:\Program Files (x86)\Bazaar\plugins\qbzr [0.14.4]
  rebase C:\Program Files (x86)\Bazaar\plugins\rebase [0.5.4]
  svn C:\Program Files (x86)\Bazaar\plugins\svn [1.0.0]
  upload C:\Program Files (x86)...

[Matthäus G. Chajdas (anteru)]

I just tried with bzr-svn 1.0.1, and the problem still persists.

bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 842, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1037, in run_bzr
  File "bzrlib\commands.pyo", line 654, in run_argv_aliases
  File "C:/Program Files (x86)/Bazaar/plugins\qbzr\lib\commands.py", line 787, in run
  File "bzrlib\commands.pyo", line 1037, in run_bzr
  File "bzrlib\commands.pyo", line 654, in run_argv_aliases
  File "bzrlib\builtins.pyo", line 1017, in run
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\workingtree.pyo", line 1611, in pull
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\branch.pyo", line 948, in pull
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\branch.py", line 731, in pull
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\branch.py", line 666, in update_revisions
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\fetch.py", line 1276, in fetch
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\fetch.py", line 1206, in _fetch_revisions
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\fetch.py", line 1151, in _fetch_revision_switch
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\errors.py", line 137, in convert
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\fetch.py", line 917, in report_inventory_contents
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\transport.py", line 192, in update
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\transport.py", line 192, in update
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\transport.py", line 192, in update
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\transport.py", line 192, in update
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\fetch.py", line 316, in change_prop
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\revmeta.py", line 263, in get_previous_fileprops
  File "C:/Users/Anteru/AppData/Roaming/bazaar/2.0/plugins\svn\revmeta.py", line 218, in get_fileprops
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 2.0.2 on python 2.5.4 (Windows-Vista-6.1.7600)
arguments: ['C:\\Program Files (x86)\\Bazaar\\bzr.exe', 'qsubprocess', '--bencode', 'l4:pull25:svn://10.1.1.1/proj/trunk11:--directory25:D:/Dev/Current/proj/trunk10:--remembere']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files (x86)\Bazaar\plugins\bzrtools [2.0.1]
  explorer C:\Program Files (x86)\Bazaar\plugins\explorer [0.8.3]
  launchpad C:\Program Files (x86)\Bazaar\plugins\launchpad [2.0.2]
  netrc_credential_store C:\Program Files (x86)\Bazaar\plugins\netrc_credential_store [2.0.2]
  qbzr C:\Program Files (x86)\Bazaar\plugins\qbzr [0.14.5]
  rebase C:\Program Files (x86)\Bazaar\plugins\rebase [0.5.4]
  svn C:\Users\Anteru\AppData\Roaming\bazaar\2.0\plugins\svn [1.0.1]
  upload ...

[pva (pva)]

Does there any workaround exists? I'd like to avoid refetching branch if possible...

Any way, same here and this was just a normal update. No bzr/bzr-svn/subvertpy was in between... It just started to fail this way:

bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "/usr/lib64/python2.6/site-packages/bzrlib/commands.py", line 842, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/bzrlib/commands.py", line 1037, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib64/python2.6/site-packages/bzrlib/commands.py", line 654, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib64/python2.6/site-packages/bzrlib/builtins.py", line 1413, in run
    view_info=view_info), possible_transports=possible_transports)
  File "/usr/lib64/python2.6/site-packages/bzrlib/workingtree.py", line 2213, in update
    old_tip = self.branch.update(possible_transports)
  File "/usr/lib64/python2.6/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/bzrlib/branch.py", line 2437, in update
    self.pull(master, overwrite=True)
  File "/usr/lib64/python2.6/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/bzrlib/branch.py", line 948, in pull
    possible_transports=possible_transports, *args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/branch.py", line 731, in pull
    self.update_revisions(stop_revision, overwrite)
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/branch.py", line 666, in update_revisions
    mapping=self.source.mapping)
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/fetch.py", line 1276, in fetch
    use_replay=self._use_replay)
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/fetch.py", line 1206, in _fetch_revisions
    parent_revmeta)
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/fetch.py", line 1151, in _fetch_revision_switch
    report_inventory_contents(reporter, parent_revnum, start_empty)
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/errors.py", line 137, in convert
    return unbound(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/fetch.py", line 917, in report_inventory_contents
    reporter.finish()
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/fetch.py", line 316, in change_prop
    self.editor.revmeta.get_previous_fileprops())
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/revmeta.py", line 263, in get_previous_fileprops
    return prev.get_fileprops()
  File "/usr/lib64/python2.6/site-packages/bzrlib/plugins/svn/revmeta.py", line 218, in get_fileprops
    while (not lm.changes_branch_root() and lm._fileprops is None and
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 2.0.1 on python 2.6.4 (Linux-2.6.32-rc8-x86_64-Intel-R-_Core-TM-2_Duo_CPU_L7500_@_1.60GHz-with...

[pva (pva)]

After I've asked, I've updated svn repository from another PC and bug gone...

[Evan Jones (evan-t-jones)]

I think this issue may be affecting me as well. The issue was in update, rather than push, but the same missing 'changes_branch_root' attribute was missing.

Project is a bzr-svn checked out branch from an SVN repo.

bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "/Library/Python/2.5/site-packages/bzrlib/commands.py", line 842, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/Library/Python/2.5/site-packages/bzrlib/commands.py", line 1037, in run_bzr
    ret = run(*run_argv)
  File "/Library/Python/2.5/site-packages/bzrlib/commands.py", line 654, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/Library/Python/2.5/site-packages/bzrlib/builtins.py", line 1413, in run
    view_info=view_info), possible_transports=possible_transports)
  File "/Library/Python/2.5/site-packages/bzrlib/workingtree.py", line 2213, in update
    old_tip = self.branch.update(possible_transports)
  File "/Library/Python/2.5/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/Library/Python/2.5/site-packages/bzrlib/branch.py", line 2437, in update
    self.pull(master, overwrite=True)
  File "/Library/Python/2.5/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/Library/Python/2.5/site-packages/bzrlib/branch.py", line 948, in pull
    possible_transports=possible_transports, *args, **kwargs)
  File "/Users/evan.jones/.bazaar/plugins/svn/branch.py", line 715, in pull
  File "/Users/evan.jones/.bazaar/plugins/svn/repository.py", line 931, in _get_revmeta
  File "/Users/evan.jones/.bazaar/plugins/svn/repository.py", line 1015, in lookup_revision_id
  File "/Users/evan.jones/.bazaar/plugins/svn/revids.py", line 265, in get_branch_revnum
  File "/Users/evan.jones/.bazaar/plugins/svn/revids.py", line 144, in bisect_revid_revnum
  File "/Users/evan.jones/.bazaar/plugins/svn/revmeta.py", line 270, in get_changed_fileprops
  File "/Users/evan.jones/.bazaar/plugins/svn/revmeta.py", line 263, in get_previous_fileprops
  File "/Users/evan.jones/.bazaar/plugins/svn/revmeta.py", line 218, in get_fileprops
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 2.0.1 on python 2.5.1 (Darwin-9.8.0-i386-32bit)
arguments: ['/usr/local/bin/bzr', 'up']
encoding: 'UTF-8', fsenc: 'utf-8', lang: 'en_US.UTF-8'
plugins:
  bzrtools /Library/Python/2.5/site-packages/bzrlib/plugins/bzrtools [2.0.1]
  email /Library/Python/2.5/site-packages/bzrlib/plugins/email [unknown]
  explorer /Domain/drd.int/Users/evan.jones/.bazaar/plugins/explorer [0.9.0]
  extmerge /Library/Python/2.5/site-packages/bzrlib/plugins/extmerge [unknown]
  hg /Library/Python/2.5/site-packages/bzrlib/plugins/hg [0.1.0]
  launchpad /Library/Python/2.5/site-packages/bzrlib/plugins/launchpad [2.0.1]
  loom /Library...

[Evan Jones (evan-t-jones)]

one more note: committed locally, _then_ updated, and that worked. a checkin then worked without complaint. Seems to match pva's experience that other alterations to the repository (either local or remote) can resolve this issue.

[Arnaud Jeansen (ajeans)]

I confirm what Evan says, some actions "solve" this problem.

I reliably reproduced the stacktrace with bzr pull (did it twice)

$ bzr pull
Using saved parent location: svn://sve-app053/wss_7213/trunk
bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 842, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1037, in run_bzr
  File "bzrlib\commands.pyo", line 654, in run_argv_aliases
  File "bzrlib\builtins.pyo", line 1017, in run
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\workingtree.pyo", line 1611, in pull
  File "bzrlib\decorators.pyo", line 192, in write_locked
  File "bzrlib\branch.pyo", line 948, in pull
  File "C:/Program Files/Bazaar/plugins\svn\branch.py", line 714, in pull
  File "C:/Program Files/Bazaar/plugins\svn\repository.py", line 931, in _get_revmeta
  File "C:/Program Files/Bazaar/plugins\svn\repository.py", line 1015, in lookup_revision_id
  File "C:/Program Files/Bazaar/plugins\svn\revids.py", line 265, in get_branch_revnum
  File "C:/Program Files/Bazaar/plugins\svn\revids.py", line 144, in bisect_revid_revnum
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 270, in get_changed_fileprops
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 263, in get_previous_fileprops
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 218, in get_fileprops
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 2.0.2 on python 2.5.4 (Windows-XP-5.1.2600-SP2)
arguments: ['c:\\Program Files\\Bazaar\\bzr.exe', 'pull']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [2.0.1]
  explorer C:\Program Files\Bazaar\plugins\explorer [0.8.3]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [2.0.2]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [2.0.2]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.14.5]
  rebase C:\Program Files\Bazaar\plugins\rebase [0.5.4]
  svn C:\Program Files\Bazaar\plugins\svn [1.0.0]
  upload C:\Program Files\Bazaar\plugins\upload [1.0.0dev]
  xmloutput C:\Program Files\Bazaar\plugins\xmloutput [0.8.5]

*** 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.

But retrying after a bzr update made it work again

$ bzr update
Tree is up to date at revision 1110.
$ bzr pull
Using saved parent location: svn://sve-app053/wss_7213/trunk
[...]
All changes applied successfully.
Now on revision 1112 (svn revno: 1723).

This is very bizarre, this is a local bzr branch created from a svn trunk, so a "bzr update" makes no sense, yet solves the problem.

[Philip Peitsch (philip-peitsch)]

I'm getting this problem on doing a bzr up from a svn repo as well. To get around that I can do a 'bzr pull -r<next revision>', and then bzr up will work as normal. The problem is very intermittent though...

[Philip Peitsch (philip-peitsch)]

Oh, the exact dump on my (windows) box is:
bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 853, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1055, in run_bzr
  File "bzrlib\commands.pyo", line 661, in run_argv_aliases
  File "bzrlib\commands.pyo", line 665, in run_direct
  File "bzrlib\cleanup.pyo", line 122, in run_simple
  File "bzrlib\cleanup.pyo", line 156, in _do_with_cleanups
  File "bzrlib\builtins.pyo", line 1408, in run
  File "bzrlib\decorators.pyo", line 194, in write_locked
  File "bzrlib\branch.pyo", line 2443, in update
  File "bzrlib\decorators.pyo", line 194, in write_locked
  File "bzrlib\branch.pyo", line 962, in pull
  File "C:/Program Files/Bazaar/plugins\svn\branch.py", line 748, in pull
  File "C:/Program Files/Bazaar/plugins\svn\branch.py", line 683, in update_revisions
  File "C:/Program Files/Bazaar/plugins\svn\fetch.py", line 1307, in fetch
  File "C:/Program Files/Bazaar/plugins\svn\fetch.py", line 1253, in _fetch_revisions
  File "C:/Program Files/Bazaar/plugins\svn\fetch.py", line 1229, in _fetch_revisions_nochunks
  File "C:/Program Files/Bazaar/plugins\svn\fetch.py", line 1171, in _fetch_revision_switch
  File "C:/Program Files/Bazaar/plugins\svn\errors.py", line 141, in convert
  File "C:/Program Files/Bazaar/plugins\svn\fetch.py", line 937, in report_inventory_contents
  File "C:/Program Files/Bazaar/plugins\svn\fetch.py", line 326, in change_prop
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 263, in get_previous_fileprops
  File "C:/Program Files/Bazaar/plugins\svn\revmeta.py", line 218, in get_fileprops
AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

bzr 2.1.1 on python 2.5.4 (Windows-XP-5.1.2600-SP3)
arguments: ['bzr', 'up']
encoding: 'cp1252', fsenc: 'mbcs', lang: None
plugins:
  bzrtools C:\Program Files\Bazaar\plugins\bzrtools [2.1.0]
  explorer C:\Program Files\Bazaar\plugins\explorer [1.0.1]
  launchpad C:\Program Files\Bazaar\plugins\launchpad [2.1.1]
  netrc_credential_store C:\Program Files\Bazaar\plugins\netrc_credential_store [2.1.1]
  news_merge C:\Program Files\Bazaar\plugins\news_merge [2.1.1]
  qbzr C:\Program Files\Bazaar\plugins\qbzr [0.18.4]
  rebase C:\Program Files\Bazaar\plugins\rebase [0.5.5]
  svn C:\Program Files\Bazaar\plugins\svn [1.0.2]
  upload C:\Program Files\Bazaar\plugins\upload [1.0.0dev]
  xmloutput C:\Program Files\Bazaar\plugins\xmloutput [0.8.7.dev]

*** 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.

[Ryo IGARASHI (rigarash)]

I am also hit by this bug on my Debian GNU/Linux (sid) box. Using 'bzr rebase' instead of 'bzr pull' solved my problem.
The full traceback of the error is as follows:

$ bzr pull
Using saved parent location: https://<email address hidden>/svn/alps1/trunk/alps
bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'changes_branch_root'

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 853, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1055, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 661, in run_argv_aliases
    return self.run_direct(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 665, in run_direct
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/cleanup.py", line 122, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/cleanup.py", line 156, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 1013, in run
    possible_transports=possible_transports, local=local)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 194, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/workingtree.py", line 1614, in pull
    local=local)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 194, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 962, in pull
    possible_transports=possible_transports, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/branch.py", line 748, in pull
    self.update_revisions(stop_revision, overwrite)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/branch.py", line 683, in update_revisions
    mapping=self.source.mapping)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/fetch.py", line 1307, in fetch
    pack_hint = self._fetch_revisions(needed, pb)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/fetch.py", line 1253, in _fetch_revisions
    use_replay=self._use_replay)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/fetch.py", line 1229, in _fetch_revisions_nochunks
    parent_revmeta)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/fetch.py", line 1171, in _fetch_revision_switch
    report_inventory_contents(reporter, parent_revnum, start_empty)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/errors.py", line 141, in convert
    return unbound(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/fetch.py", line 937, in report_inventory_contents
    reporter.finish()
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/fetch.py", line 326, in change_prop
    self.editor.revmeta.get_previous_fileprops())
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/revmeta.py", line 263, in get_previous_filep...

[Philip Peitsch (philip-peitsch)]

We seem to hit this generally just after merging a feature branch into main locally. For example

- Assuming there is a folder called svntrunk which is bound to the main svn repo
1. Create a feature branch
2. Make changes in the feature branch
3. Merge & commit back into svntrunk
4. Run a bzr up which is pulling in someone else's changes to svntrunk

This is the pattern we use.... and I find infrequently (probably 1 in 5-10 merges) will crash with this message

[Jelmer Vernooij (jelmer)]

I've seen this on a couple of occasions as well, but I can't reproduce it reliably so it's hard to fix :-( If somebody has a shell script that can regularly reproduce it, please provide it :-(

[Jelmer Vernooij (jelmer)]

Several bugs related to this were just fixed. Can somebody confirm it still occurs?

[Michael J. Vinca (michaelj)]

I had this occur today when trying to do a BZR branch of directory in an SVN repo... bzr-svn 1.1.0

B:\Projects\EIB>bzr branch --no-tree http://server/svn/bin/Boards/EIB/ platform
HTTP server, Realm: 'CollabNet Subversion Repository' username: *****
HTTP *****, Realm: 'CollabNet Subversion Repository' password:
bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'encode'

Traceback (most recent call last):
  File "bzrlib\commands.pyo", line 946, in exception_to_return_code
  File "bzrlib\commands.pyo", line 1150, in run_bzr
  File "bzrlib\commands.pyo", line 699, in run_argv_aliases
  File "bzrlib\commands.pyo", line 721, in run
  File "bzrlib\cleanup.pyo", line 135, in run_simple
  File "bzrlib\cleanup.pyo", line 165, in _do_with_cleanups
  File "D:/Program Files/Bazaar/plugins\externals\commands.py", line 225, in run
  File "bzrlib\builtins.pyo", line 1279, in run
  File "D:/Program Files/Bazaar/plugins\svn\branch.py", line 521, in last_revision
  File "D:/Program Files/Bazaar/plugins\svn\branch.py", line 304, in last_revmeta
  File "D:/Program Files/Bazaar/plugins\svn\util.py", line 142, in next
  File "D:/Program Files/Bazaar/plugins\svn\util.py", line 124, in _next
  File "D:/Program Files/Bazaar/plugins\svn\revmeta.py", line 998, in _iter_reverse_revmeta_mapping_history
  File "D:/Program Files/Bazaar/plugins\svn\revmeta.py", line 923, in iter_reverse_branch_changes
  File "D:/Program Files/Bazaar/plugins\svn\util.py", line 165, in next
  File "D:/Program Files/Bazaar/plugins\svn\metagraph.py", line 263, in next
  File "D:/Program Files/Bazaar/plugins\svn\metagraph.py", line 215, in _get_next
  File "D:/Program Files/Bazaar/plugins\svn\metagraph.py", line 543, in iter_changes
  File "D:/Program Files/Bazaar/plugins\svn\changes.py", line 74, in find_prev_location
AttributeError: 'NoneType' object has no attribute 'encode'

bzr 2.4.2 on python 2.6.6 (Windows-XP-5.1.2600-SP3)
arguments: ['bzr', 'branch', '--no-tree', 'http://server/svn/bin/Boards/EIB/', 'platform']
plugins: bzrtools[2.4.1], changelog_merge[2.4.2], colo[0.3.1dev],
    explorer[1.2.1], externals[1.3.3], fastimport[0.12.0dev],
    launchpad[2.4.2], loom[2.2.1dev], netrc_credential_store[2.4.2],
    news_merge[2.4.2], pipeline[1.1.0], qbzr[0.21.1], rewrite[0.6.3dev],
    svn[1.1.0], upload[1.0.1dev], xmloutput[0.8.7]
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.