Detect if an incompatible DJANGO_SETTINGS_MODULE is set

[Daniele Procida]

With:

• pip==10.0.1
• Python==3.5.2
• in a Docker environment

the startproject command exits with a status 1:

subprocess.CalledProcessError: Command '['/srv/linsci/env/bin/python3.5', '/srv/linsci/env/bin/django-admin.py', 'startproject', 'django_cms', '/srv/linsci/src/website/django_cms']' returned non-zero exit status 1

However the same user @mnieber reports that it works on the host on the same machine.

In addition, with pip==10.0.1, a warning is raised about the combination:

Django==1.11.13
djangocms-column==1.7.0

djangocms-column 1.7.0 has requirement django<1.10,>=1.8, but you'll have django 1.11.13 which is incompatible.

It's not clear yet whether the warning is related to the error (I can reproduce the warning, but not the error).

See also django-cms/djangocms-column#36 (comment).

[Daniele Procida]

From django-cms/djangocms-column#36:

In the docker environment, I had DJANGO_SETTINGS_MODULE defined (to a value that is not compatible with the djangocms project layout) [that caused this issue].

I guess this problem could be detected early by letting djangocms-installer check that there is no DJANGO_SETTINGS_MODULE environment variable pointing to the wrong value.

[Iacopo Spalletti]

setup.py from pypi package (https://files.pythonhosted.org/packages/65/46/3926c8df842ca80cdd7fd72fc840da797de68abe6acaf49d9723aba36f46/djangocms-column-1.7.0.tar.gz, wheel has the same issue) has the following requirements

INSTALL_REQUIRES = [
    'django-cms>=3.2.0',
    'django>=1.8,<1.10',
]

[Iacopo Spalletti]

I cannot reproduce the failure using the followin Dockerfile

FROM python:3.5
ENV PYTHONUNBUFFERED=1 \
    PIP_REQUIRE_VIRTUALENV=false \
    LC_ALL=C.UTF-8 \
    LANG=C.UTF-8 \
    PYTHONPATH=/app/src:$PYTHONPATH
RUN apt-get update
RUN apt-get install -y --force-yes --no-install-recommends net-tools redis-tools vim gettext
# Project root
RUN mkdir /app
# All development apps will be mounted in /contrib
RUN mkdir /contrib
WORKDIR /app
RUN pip install "Django>=1.11,<1.11.999" "pip>10"
RUN pip install djangocms-installer
# Creates project directory inside app
RUN djangocms -f -p . project --cms-version=3.5

[Maarten Nieber]

@yakky Please see the comment above: it's related to the existence of a DJANGO_SETTINGS_MODULE environment variable (pointing to a value that is incompatible with the django_cms project layout)

[Iacopo Spalletti]

@mnieber how about forcing a compatible DJANGO_SETTINGS_MODULE during the installer run? (I missed the second comment by daniele as I already made the tests before he posted his comment and then I posted mine a few hours after without being aware of his second comment)

[Maarten Nieber]

@yakky Yes, that sounds good! If the DJANGO_SETTINGS_MODULE value is not compatible, the installer can stop with an error.