[Bug python/25826] New: Handle verbose python initialization problems

[Bug python/25826] New: Handle verbose python initialization problems

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25826

            Bug ID: 25826
           Summary: Handle verbose python initialization problems
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Say my gdb is built against system python, and somehow I've managed to install
a site package that gives me trouble:
...
$ cat /usr/lib/python3.6/site-packages/Paste-3.4.0-py2.7-nspkg.pth
import sys, types, os;raise NameError('HiThere')
...
so when I run python, I see:
...
$ /usr/bin/python3.6
Error processing line 1 of
/usr/lib/python3.6/site-packages/Paste-3.4.0-py2.7-nspkg.pth:

  Traceback (most recent call last):
    File "/usr/lib64/python3.6/site.py", line 168, in addpackage
      exec(line)
    File "<string>", line 1, in <module>
  NameError: HiThere

Remainder of file ignored
Python 3.6.10 (default, Jan 16 2020, 09:12:04) [GCC] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
...
and likewise, when I run gdb:
...
$ gdb -q
Error processing line 1 of
/usr/lib/python3.6/site-packages/Paste-3.4.0-py2.7-nspkg.pth:

  Traceback (most recent call last):
    File "/usr/lib64/python3.6/site.py", line 168, in addpackage
      exec(line)
    File "<string>", line 1, in <module>
  NameError: HiThere

Remainder of file ignored
(gdb) 
...

It would be nice if we could do something about this in gdb, like:
- disable python if any output occurs during initialization (which is
  perhaps a bit harsh), or
- dress up the output a bit to clarify the situation.

F.i., the latter could be something like this:
...
$ gdb -q
Warning: Python initialization succeeded, but with output (does python
installation need fixing?):
<start of python initialization output>
Error processing line 1 of
/usr/lib/python3.6/site-packages/Paste-3.4.0-py2.7-nspkg.pth:

  Traceback (most recent call last):
    File "/usr/lib64/python3.6/site.py", line 168, in addpackage
      exec(line)
    File "<string>", line 1, in <module>
  NameError: HiThere

Remainder of file ignored
<end of python initialization output>
(gdb)
...

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[Bug python/25826] Handle verbose python initialization problems

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25826

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)

> <start of python initialization output>
> Error processing line 1 of
> /usr/lib/python3.6/site-packages/Paste-3.4.0-py2.7-nspkg.pth:
> 
>   Traceback (most recent call last):
>     File "/usr/lib64/python3.6/site.py", line 168, in addpackage
>       exec(line)
>     File "<string>", line 1, in <module>
>   NameError: HiThere
> 
> Remainder of file ignored
> <end of python initialization output>

or:
...
python initialization output available in temp file
/tmp/gdb-python-init.XXXXXX.log
...

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