#20445: BaseCommand --traceback should raise the original Exception
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Reporter: jorgebastida | Owner: jorgebastida
Type: Bug | Status: new
Component: Core (Management commands) | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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When you are debugging long-running process that take hours to finish is
really helpful to run them using {{{ ipython --pdb <script> }}} so in
case of failure, you'll get a ipdb trace just before the Exception was
raised, so you can check what was wrong and fix it instead of adding an
{{{ipdb}}} and re running the script.
As for the last weeks I've been writing some django command that takes
hours to run I tried to run these scripts using {{{ ipython --pdb
manage.py <command>}}} but unfortunately I found that
{{{BaseCommand.run_from_argv}}} was capturing any Exception raised by my
command and printing the traceback to {{{stderr}}} if the
{{{--traceback}}} option was present, or name and error if not.
In order to use {{{ipython --pdb}}} I need to override {{{
run_from_argv}}} In my commands and basically don't try/except
{{{self.execute(*args, **options.__dict__)}}} what is pretty hacky.
After talking with Russell Keith-Magee we found that, as python default
behavior is to print the traceback into {{{stderr}} and return an error
status code when an Exception is raised and not captured, the solution
would probably be to {{{raise}}} the Exception if {{{--traceback}}} is
present. The consequences are:
a) The existing behavior doesn't change.
b) We can call {{{manage.py}}} commands from interpreters that do fancy
things when exceptions are raised.
I haven't found anything related in the "Better Error Message" wiki page:
https://code.djangoproject.com/wiki/BetterErrorMessages
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Ticket URL: <https://code.djangoproject.com/ticket/20445>
Django <https://code.djangoproject.com/>
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