[Bug 2024325] [NEW] [SRU] trac crashes while importing a library in Ubuntu 20.04 (ImportError: cannot import name 'soft_unicode' from 'jinja2.utils')

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Sudip Mukherjee (sudipmuk):

[ Impact ]

trac is completely unusable as it will fail with the below error
whenever any user tries to run "tracd" or "trac-admin":

Traceback (most recent call last):
  File "/usr/bin/tracd", line 33, in <module>
    sys.exit(load_entry_point('Trac==1.5.3', 'console_scripts', 'tracd')())
  File "/usr/bin/tracd", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/lib/python3.10/importlib/metadata/__init__.py", line 171, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/trac/web/standalone.py", line 35, in <module>
    from trac.web.auth import BasicAuthentication, DigestAuthentication
  File "/usr/lib/python3/dist-packages/trac/web/auth.py", line 29, in <module>
    from trac.web.chrome import Chrome, INavigationContributor
  File "/usr/lib/python3/dist-packages/trac/web/chrome.py", line 40, in <module>
    from trac.mimeview.api import RenderingContext, get_mimetype
  File "/usr/lib/python3/dist-packages/trac/mimeview/__init__.py", line 14, in <module>
    from trac.mimeview.api import *
  File "/usr/lib/python3/dist-packages/trac/mimeview/api.py", line 70, in <module>
    from trac.resource import Resource
  File "/usr/lib/python3/dist-packages/trac/resource.py", line 21, in <module>
    from trac.util.presentation import classes
  File "/usr/lib/python3/dist-packages/trac/util/presentation.py", line 26, in <module>
    from jinja2.utils import soft_unicode
ImportError: cannot import name 'soft_unicode' from 'jinja2.utils' (/usr/lib/python3/dist-packages/jinja2/utils.py)

[ Test Plan ]

* Simple test:
  - Execute "tracd --help" or "tracd"
  - Execute "trac-admin --help" or "trac-admin"
  - If its not fixed then both the commands will fail as the error above
  - With fixed package both the commands will show the help message.

* More comprehensive test: (execue the following as root)
  - mkdir -p /var/lib/trac
  - trac-admin /var/lib/trac/myproject initenv
  - Enter some project name when prompted
  - Leave default sqlite DB (just press enter)
  - echo -n "tracadmin:example.com:" > /var/lib/trac/myproject/users.htdigest
  - trac-admin /var/lib/trac/myproject permission add tracadmin TRAC_ADMIN
  - tracd --port 8080 --auth=*,/var/lib/trac/myproject/users.htdigest,example.com /var/lib/trac/myproject
  - open http://127.0.0.1:8080 in browser, it should show the project name and clicking on that should show the welcome screen

[ Where problems could occur ]

It is not changing any part of the code, its only importing the module
with the new name and so there is minimum chance of any regression.

[ Other Info ]

- The Ubuntu patch is a combination of portions of two upstream but related changes.
- One of the upstream changes mentions about an AssertionError for jinja, so it will be great if this can be tested by a real user of trac. The testplan only checks the server starts and is working.

[ Original Bug Description ]

Trac 1.5.3 which comes with Ubuntu 20.04 crashes because of problems
with a library. The problem was fixed upstream:
https://trac.edgewall.org/ticket/13404

** Affects: trac (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: trac (Ubuntu Jammy)
     Importance: Undecided
         Status: Confirmed


** Tags: jammy
-- 
[SRU] trac crashes while importing a library in Ubuntu 20.04 (ImportError: cannot import name 'soft_unicode' from 'jinja2.utils')
https://bugs.launchpad.net/bugs/2024325
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