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've been using Trac for a number of years, primarily for the wiki
component, and upgraded to V1.2.2 a while ago. I'm just running it locally
on my laptop using the 'tracd' command. Everything has been working well
until I upgraded from Mint V19.3 to V20.0 and then Trac stopped working
properly. Part of the upgrade procedure was to downgrade and remove foreign
packages through the 'software sources' application. I suspect something
was removed or downgraded that is causing the trouble.

The first symptom was that all the wiki text on a page was showing up in
one large raw text block. Looking at the HTML, it was all in one 'code'
div which explains why it looks that way but not why it isn't processed.
Most of my wiki pages are written using Restructured Text.

After a while (and I don't remember doing any changes), even that stopped
working and I got an error 'Unsupported database type "sqlite"' as well as
an error in the 'BrowserModule':
[image: image.png]


One difference in Mint V20 is that there is no 'python' command - it's
changed to only have python2 and python3 commands. I added a symlink for
'python' to point to python2.7, like the python2 symlink does, but the
problem in Trac didn't change.

Note that this laptop is a dual boot with Windows 10 with the trac
environment on a shared drive and Trac still works from the windows side.

Looking in the log there are several errors - some with plug-in version
mismatches (even though I disabled the plugins in the trac.ini file), which
I should be able to clear up, but the main problem seems to be an inability
to connect to the sqlite database:

2020-08-21 12:37:35,451 Trac[env] INFO: --------------------------------
environment startup [Trac 1.2.2] --------------------------------
2020-08-21 12:37:35,491 Trac[loader] ERROR: Skipping "TracMercurial
0.12.0.31.dev0": VersionConflict: (TracMercurial 1.0.0.7
(/usr/local/lib/python2.7/dist-packages),
Requirement.parse('TracMercurial==0.12.0.31.dev0'))
2020-08-21 12:37:35,491 Trac[loader] ERROR: Skipping "TracThemeEngine
2.1.3": VersionConflict: (TracThemeEngine 2.2.2
(/usr/local/lib/python2.7/dist-packages),
Requirement.parse('TracThemeEngine==2.1.3'))
2020-08-21 12:37:35,504 Trac[loader] ERROR: Skipping "bzr =
tracbzr.backend":
Traceback (most recent call last):
File "/home/dennis/.local/lib/python2.7/site-packages/trac/loader.py",
line 68, in _load_eggs
entry.load(require=True)
File
"/home/dennis/.local/lib/python2.7/site-packages/pkg_resources/__init__.py",
line 2408, in load
return self.resolve()
File
"/home/dennis/.local/lib/python2.7/site-packages/pkg_resources/__init__.py",
line 2414, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "build\bdist.win32\egg\tracbzr\backend.py", line 47, in <module>
ValueError: invalid literal for int() with base 10: '2.'
2020-08-21 12:37:35,685 Trac[loader] ERROR: Skipping "trac.db.sqlite =
trac.db.sqlite_backend":
Traceback (most recent call last):
File "/home/dennis/.local/lib/python2.7/site-packages/trac/loader.py",
line 68, in _load_eggs
entry.load(require=True)
File
"/home/dennis/.local/lib/python2.7/site-packages/pkg_resources/__init__.py",
line 2408, in load
return self.resolve()
File
"/home/dennis/.local/lib/python2.7/site-packages/pkg_resources/__init__.py",
line 2414, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File
"/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line
181, in _demandimport
return _hgextimport(_origimport, name, globals, locals, fromlist, level)
File
"/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line
44, in _hgextimport
return importfunc(name, globals, *args, **kwargs)
File
"/home/dennis/.local/lib/python2.7/site-packages/trac/db/sqlite_backend.py",
line 45, in <module>
pysqlite_version_string = get_pkginfo(sqlite).get('version',
File
"/home/dennis/.local/lib/python2.7/site-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
158, in __getattr__
return getattr(self._module, attr)
AttributeError: 'module' object has no attribute 'has_metadata'
2020-08-21 12:37:35,713 Trac[loader] ERROR: Skipping "trac.mimeview.rst =
trac.mimeview.rst [rest]":
Traceback (most recent call last):
File "/home/dennis/.local/lib/python2.7/site-packages/trac/loader.py",
line 68, in _load_eggs
entry.load(require=True)
File
"/home/dennis/.local/lib/python2.7/site-packages/pkg_resources/__init__.py",
line 2408, in load
return self.resolve()
File
"/home/dennis/.local/lib/python2.7/site-packages/pkg_resources/__init__.py",
line 2414, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File
"/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line
181, in _demandimport
return _hgextimport(_origimport, name, globals, locals, fromlist, level)
File
"/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line
44, in _hgextimport
return importfunc(name, globals, *args, **kwargs)
File
"/home/dennis/.local/lib/python2.7/site-packages/trac/mimeview/rst.py",
line 157, in <module>
rst.directives.register_directive('trac', trac_directive)
File
"/usr/lib/python2.7/dist-packages/hgdemandimport/demandimportpy2.py", line
158, in __getattr__
return getattr(self._module, attr)
AttributeError: 'module' object has no attribute 'directives'
2020-08-21 12:37:35,768 Trac[env] ERROR: Exception caught while checking
for upgrade:
Traceback (most recent call last):
File "/home/dennis/.local/lib/python2.7/site-packages/trac/env.py", line
942, in open_environment
needs_upgrade = env.needs_upgrade()
File "/home/dennis/.local/lib/python2.7/site-packages/trac/env.py", line
796, in needs_upgrade
with self.db_query as db:
File "/home/dennis/.local/lib/python2.7/site-packages/trac/db/api.py",
line 174, in __enter__
db = self.dbmgr.get_connection(readonly=True)
File "/home/dennis/.local/lib/python2.7/site-packages/trac/db/api.py",
line 463, in get_connection
connector, args = self.get_connector()
File "/home/dennis/.local/lib/python2.7/site-packages/trac/db/api.py",
line 615, in get_connector
scheme=scheme))
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:35,769 Trac[env] WARNING: base_url option not set in
configuration, generated links may be incorrect
2020-08-21 12:37:35,772 Trac[main] WARNING: [127.0.0.1] HTTPInternalError:
500 Trac Error (Unsupported database type "sqlite"), <RequestWithSession
"GET '/wiki'">, referrer 'http://localhost:8000/Trac_Env/prefs'
2020-08-21 12:37:35,773 Trac[chrome] WARNING: Error with navigation
contributor BrowserModule: TracError: Unsupported database type "sqlite"
2020-08-21 12:37:35,774 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:35,948 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:35,978 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:36,012 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:36,042 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:36,089 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:36,089 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:43,040 Trac[main] ERROR: can't retrieve session:
TracError: Unsupported database type "sqlite"
2020-08-21 12:37:43,040 Trac[main] WARNING: [127.0.0.1] HTTPInternalError:
500 Trac Error (Unsupported database type "sqlite"), <RequestWithSession
"GET '/'">, referrer None
2020-08-21 12:37:43,042 Trac[chrome] WARNING: Error with navigation
contributor BrowserModule: TracError: Unsupported database type "sqlite"

To ensure the Trac installation was complete I tried reinstalling (using
pip) Trac (V1.2.6) which installed successfully - it stated V1.2.2 was
found and uninstalled and V1.2.6 was installed. No change in the
behaviour. I also made sure that python-sqlite3 was in the Python2.7
libraries and also installed docutils, which was missing (and probably why
the Restructured Text pages were being displayed as 'code').

I'm out of ideas on how to fix the database access problem. Any
suggestions for what I should try next?

Thanks,
Dennis

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