[Python-apps-team] Bug#920977: Breaks loading of db backends in Trac

[Julien Cristau]

On 1/31/19 9:11 AM, Andras Korn wrote:
> Package: mercurial-common
> Version: 4.8.2-1
> Severity: important
> 
> Hi,
> 
> as long as mercurial-common is installed, the postgres and sqlite db backend driver of Trac won't load:
> 
> 2019-01-31 08:58:49,372 Trac[loader] ERROR: Skipping "trac.db.postgres = trac.db.postgres_backend": 
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/dist-packages/trac/loader.py", line 77, in _load_eggs
>     entry.load(require=True)
>   File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2346, in load
>     return self.resolve()
>   File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2352, in resolve
>     module = __import__(self.module_name, fromlist=['__name__'], level=0)
>   File "/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line 172, in _demandimport
>     return _hgextimport(_origimport, name, globals, locals, fromlist, level)
>   File "/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line 43, in _hgextimport
>     return importfunc(name, globals, *args, **kwargs)
>   File "/usr/lib/python2.7/dist-packages/trac/db/postgres_backend.py", line 46, in <module>
>     psycopg2_version = get_pkginfo(psycopg).get('version',
>   File "/usr/lib/python2.7/dist-packages/trac/util/__init__.py", line 806, in get_pkginfo
>     metadata = 'METADATA' if dist.has_metadata('METADATA') else 'PKG-INFO'
>   File "/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line 151, in __getattr__
>     return getattr(self._module, attr)
> AttributeError: 'module' object has no attribute 'has_metadata'
> 2019-01-31 08:58:49,372 Trac[loader] DEBUG: Loading plugin "trac.db.sqlite" from "/usr/lib/python2.7/dist-packages"
> 2019-01-31 08:58:49,374 Trac[loader] ERROR: Skipping "trac.db.sqlite = trac.db.sqlite_backend": 
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/dist-packages/trac/loader.py", line 77, in _load_eggs
>     entry.load(require=True)
>   File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2346, in load
>     return self.resolve()
>   File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2352, in resolve
>     module = __import__(self.module_name, fromlist=['__name__'], level=0)
>   File "/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line 172, in _demandimport
>     return _hgextimport(_origimport, name, globals, locals, fromlist, level)
>   File "/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line 43, in _hgextimport
>     return importfunc(name, globals, *args, **kwargs)
>   File "/usr/lib/python2.7/dist-packages/trac/db/sqlite_backend.py", line 45, in <module>
>     pysqlite_version_string = get_pkginfo(sqlite).get('version',
>   File "/usr/lib/python2.7/dist-packages/trac/util/__init__.py", line 806, in get_pkginfo
>     metadata = 'METADATA' if dist.has_metadata('METADATA') else 'PKG-INFO'
>   File "/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line 151, in __getattr__
>     return getattr(self._module, attr)
> AttributeError: 'module' object has no attribute 'has_metadata'
> 
> I don't understand what the connection is, but removing mercurial-common
> (which ships
> /usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py) helps.
> 
As far as I can tell for this to happen something must have called
hgdemandimport.enable().  Can you track down what that is?

Cheers,
Julien