[Bug 1835320] [NEW] mu-editor python debugger broken.

[Launchpad Bug Tracker]

You have been subscribed to a public bug by peter green (plugwash):

The "debug" function in mu-editor is broken in the version shipped in
Ubuntu disco. Since mu is intended as a tool for teaching beginner
programmers this servely limits it's usefulness.

Nick Morrot and I have already fixed this in sid and the fix from sid has already migrated to buster and eoan. I would like to see this fixed in disco
too.

[Test Case]

Install mu-editor and run it through the programs menu.

Make sure you are in "python 3" mode. On the first run a box should pop
up to select the mode. On later runs you can change mode through the
????

Write a small python program and click on the debug button. The expected
behavior is that debugging starts, but instead

> Traceback (most recent call last):
>
> File "/usr/share/mu-editor/mu/mu-debug.py", line 4, in <module>
>
> from mu.app import debug
>
> ModuleNotFoundError: No module named 'mu'

[Analysis]

This is a python path issue. mu-editor's python modules are installed
under /usr/share/mu-editor/ . The main editor binary is installed in
/usr/share/mu-editor and so finds the modules successfully though
sys.path[0], however the debugger script is installed in /usr/share/mu-
editor/mu and so does not find the modules.

The fix is to tweak sys.path in the debugger script before loading mu
modules.

[Regression Potential]

Potential for regression seems minimal. mu-editor is a leaf package and
written in pure python, there are no compiled binaries in the package
that could be affected by the compiler version. The debugger script in
question is currently unusable so there doesn't seem much potential for
making it worse.

When comparing the old and new binaries the only changes I could find other
than the intentional one were some date stamp changes on some image files
and some html footer changes as a result of a new sphinx version. Neither of
these seem likely to cause regressions.

** Affects: mu-editor (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: mu-editor (Ubuntu Disco)
     Importance: Undecided
         Status: New

-- 
mu-editor python debugger broken.
https://bugs.launchpad.net/bugs/1835320
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