#27059: autoreload loose the sys.path in some cases (buildout install of python
for
instance, maybe others)
-------------------------------------+-------------------------------------
Reporter: Annakan | Owner: nobody
Type: Bug | Status: new
Component: Core (Management | Version: 1.10
commands) | Keywords: reloader runserver
Severity: Normal | buildout isolation pythonpath
| sys.path
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 1 | UI/UX: 0
-------------------------------------+-------------------------------------
In my configuration, aiming for isolation, I installed django with pyenv
(virtualenv) and buildout.
In that case when using {{{manage.py runserver}}} the reloading loose the
sys.path (and thus the eggs installed in the buildout)
In the case of a buildout sys.executable give the path of the python
executable the buildout was build with and not the python script in
<buildout-root>/bin/
I am not sure why nobody had the problem before but I devised a hack since
restart_with_reloader properly copy the environment I patched the code to
copy the sys.path into the pythonpath envar of the process.
The modified code is below :
{{{
def restart_with_reloader():
while True:
args = [sys.executable] + ['-W%s' % o for o in sys.warnoptions] +
sys.argv
if sys.platform == "win32":
args = ['"%s"' % arg for arg in args]
# Simply restarting the executable won't preserve
virtualenv/pyenv/buildout path properly in case of a "buildout"
# sys.executable point at the the python binary used to create
the buildout
# and not the bin/python script used to launch the manage.py
script
cur_python_path = ':'.join(sys.path)
if 'PYTHONPATH' in os.environ:
if cur_python_path not in os.environ['PYTHONPATH']:
os.environ['PYTHONPATH'] += cur_python_path
else:
os.environ['PYTHONPATH'] = cur_python_path
new_environ = os.environ.copy()
new_environ["RUN_MAIN"] = 'true'
exit_code = os.spawnve(os.P_WAIT, sys.executable, args,
new_environ)
if exit_code != 3:
return exit_code
}}}
The 6 lines added are
{{{
cur_python_path = ':'.join(sys.path)
if 'PYTHONPATH' in os.environ:
if cur_python_path not in os.environ['PYTHONPATH']:
os.environ['PYTHONPATH'] += cur_python_path
else:
os.environ['PYTHONPATH'] = cur_python_path
}}}
I am not sure there are side effects for project without a buildout though
but is seems to me that if site.py is not too messed up with (we are
looking at you ubuntu and thanks pyenv ;) ) pythonpath is second in
peeking order and we should aim to preserve the original sys.path when
reloading.
The worse that could happen is that the sys.path contains the same path
twice, but I checked and Python seems to properly clean up the sys.path to
keep module paths de-duplicated.
--
Ticket URL: <https://code.djangoproject.com/ticket/27059>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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