Mercurial plugin load fails with KeyError

[obaudys@…]

After installing the mercurial plugin 0.12 from svn (r9771), with trac 0.12b, I get the following error in <trac-env>/logs/trac.log:

2010-06-03 17:49:22,042 Trac[env] INFO: -------------------------------- environment startup [Trac 0.12b1] -----------------------------
---
2010-06-03 17:49:22,078 Trac[loader] DEBUG: Adding plugin TracMercurial 0.12.0.21dev-r9771 from /home/ondrej/work/tracenv/plugins/TracMercurial-0.12.0.21dev_r9771-py2.6.egg
2010-06-03 17:49:22,092 Trac[loader] DEBUG: Loading hg from /home/ondrej/work/tracenv/plugins/TracMercurial-0.12.0.21dev_r9
771-py2.6.egg
2010-06-03 17:49:22,108 Trac[loader] ERROR: Skipping "hg = tracext.hg.backend": 
Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/loader.py", line 70, in _load_eggs
    entry.load(require=True)
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 1913, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "build/bdist.linux-x86_64/egg/tracext/hg/backend.py", line 38, in <module>
  File "build/bdist.linux-x86_64/egg/trac/util/translation.py", line 88, in domain_functions
    return [_functions[s] for s in symbols]
KeyError: ('gettext', '_', 'tag_', 'N_', 'add_domain'))

Needless to say, when I navigate to "Admin -> Repositories" and try to add a mercurial repository, the "hg" repository type option is not there.

If I add it manually to config/trac.ini, like so:

[trac]
# ...
repository_dir = /home/ondrej/tmp/hg/proper/default
repository_type = hg

then I get the following:

'Warning: Can't synchronize with repository "(default)" (Unsupported version control system "hg": Can't find an appropriate component, maybe the corresponding plugin was not enabled? ). Look in the Trac log for more information.'

at the top of the page when I navigate to Admin -> Repositories

[Ondrej Baudys <obaudys@…>]

Well, seeing as the error occurred in trac/util/translation.py, on a whim I installed Babel 0.9.5 via "easy_install". The error I get now changes to:

2010-06-03 18:17:29,265 Trac[env] INFO: -------------------------------- environment startup [Trac 0.12b1] --------------------------------
2010-06-03 18:17:29,296 Trac[loader] DEBUG: Adding plugin TracMercurial 0.12.0.21dev-r9771 from /home/ondrej/work/tracenv/plugins/TracMercurial-0.12.0.21dev_r9771-py2.6.egg
2010-06-03 18:17:29,311 Trac[loader] DEBUG: Loading hg from /home/ondrej/work/tracenv/plugins/TracMercurial-0.12.0.21dev_r9771-py2.6.egg
2010-06-03 18:17:29,326 Trac[loader] ERROR: Skipping "hg = tracext.hg.backend": 
Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/loader.py", line 70, in _load_eggs
    entry.load(require=True)
  File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 1913, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "build/bdist.linux-x86_64/egg/tracext/hg/backend.py", line 38, in <module>
ValueError: need more than 1 value to unpack)

Obviously there is some coupling there with Babel, which is optional, is it not? So that in itself is a bug which produced the KeyError.

[Christian Boos]

Sorry, r9770 broke compatibility with Trac 0.12b1, you should either get an older version of the plugin, or wait till this evening for 0.12rc1.

I clarified the situation with a new version number (r9811) and an update of the TracMercurial#Releases table.