Trac 1.5.3 with Apache+fcgi and Python 3.8.10 doesn't work

[bobben@…]

Hi!

Just tried Trac 1.5.3 which is supposed to run on Python 3.5+ but I can't get it to work.

Running track-admin works fine, such as these commands:

sudo trac-admin /www/trac upgrade
sudo trac-admin /www/trac wiki upgrade
sudo trac-admin /www/trac deploy /www/trac/deploy
sudo trac-admin /www/trac repository resync '*'

But the front-end won't work.

I get this error in my Apache logs:

Content-Type: text/plain

 Oops...

Trac detected an internal error:

No module named 'dummy_thread'

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/trac/web/_fcgi.py", line 53, in <module>
    import thread
ModuleNotFoundError: No module named 'thread'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/WebServer/CGI-Executables/trac.fcgi", line 33, in <module>
    from trac.web import fcgi_frontend
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/trac/web/fcgi_frontend.py", line 51, in <module>
    from ._fcgi import WSGIServer
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/trac/web/_fcgi.py", line 57, in <module>
    import dummy_thread as thread
ModuleNotFoundError: No module named 'dummy_thread'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/WebServer/CGI-Executables/trac.fcgi", line 47, in <module>
    tb = io.Bytes()
AttributeError: module 'io' has no attribute 'Bytes'
[Tue May 11 00:02:50.663862 2021] [:warn] [pid 11858:tid 123145536704512] mod_fcgid: error reading data, FastCGI server closed connection
[Tue May 11 00:02:50.663958 2021] [:error] [pid 11858:tid 123145536704512] End of script output before headers: trac.fcgi

So I Googled and found that you could create a thread.py file (with some content) in the site-packages directory which fixed the problem "no module named 'thread'", but then I got this error message instead:

Content-Type: text/plain

 Oops...

Trac detected an internal error:

'OSError' object is not subscriptable

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/trac/web/_fcgi.py", line 987, in _setupSocket
    sock.getpeername()
OSError: [Errno 57] Socket is not connected

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/WebServer/CGI-Executables/trac.fcgi", line 34, in <module>
    fcgi_frontend.run()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/trac/web/fcgi_frontend.py", line 54, in run
    WSGIServer(dispatch_request, **params).run()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/trac/web/_fcgi.py", line 1064, in run
    sock = self._setupSocket()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/trac/web/_fcgi.py", line 989, in _setupSocket
    if e[0] == errno.ENOTSOCK:
TypeError: 'OSError' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/WebServer/CGI-Executables/trac.fcgi", line 47, in <module>
    tb = io.Bytes()
AttributeError: module 'io' has no attribute 'Bytes'
[Mon May 10 23:18:28.531449 2021] [:warn] [pid 11858:tid 123145537777664] mod_fcgid: error reading data, FastCGI server closed connection
[Mon May 10 23:18:28.531739 2021] [:error] [pid 11858:tid 123145537777664] End of script output before headers: trac.fcgi

I am using the latest trac.fcgi from installation of Trac 1.5.3, which points to the Python 3.8 binary and the trac.fcgi file has execute permissions for the 'www' user of Apache.

Some googling suggested that the error 'End of script output' and Apache error 500 is because of insufficient execute permissions of the trac.fcgi in the cgi-bin for Apache.

Used 'r-x------' (500) for user 'www' successfully with Python 2.7 and Trac 1.4.2, but even tried 'r-x--x--x' (511) with this new version, but doesn't help.

I'm currently running Apache 2.4.46, mod_fcgid 2.3.9, subversion 1.14.1 and Python 3.8.10 on macOS 10.13.6.

Kind regards Pär

[Jun Omae]

Thanks for the reporting! I try to confirm the issue and fix it.

[Jun Omae]

Proposed changes in [b469a4f7d/jomae.git] (jomae.git@t13403). Tested on Apache 2.4 with mod_fcgid.

[bobben@…]

Yep, that fixed it, thanks!

[Jun Omae]

Committed in [17541].