Add custom Python packages

[wilcopots]

Describe the issue

Since Weblate version 5.5, one of the changes is:

• Docker image now ships Python packages in /app/venv and installs using uv.

I am using the package elastic-apm for monitoring and a custom Python module for label changes.
Both I'm not able to install anymore.

I already tried

• I've read and searched the documentation.
• I've searched for similar filed issues in this repository.

Steps to reproduce the behavior

What I used to do in the dockerfile until version 5.4.3.1:
FROM weblate/weblate:5.4.3.1
RUN pip install elastic-apm
RUN echo 'INSTALLED_APPS += ("elasticapm.contrib.django",)' >> "/app/data/settings-override.py"
RUN echo "MIDDLEWARE += ('elasticapm.contrib.django.middleware.Catch404Middleware',)" >> "/app/data/settings-override.py"
RUN echo "ELASTIC_APM = {'DJANGO_TRANSACTION_NAME_FROM_ROUTE': True, 'DEBUG': True}" >> "/app/data/settings-override.py"

COPY --chown=weblate:weblate weblate_customization/ /usr/lib/python3.9/site-packages/weblate_customization/
RUN pip install -e /usr/lib/python3.9/site-packages/weblate_customization/
RUN echo "CHECK_LIST += ('weblate_customization.checks.TranslationSameAsKeyCheck',)" >> "/app/data/settings-override.py"

But since UV, Python package and project manager is used (version 5.5+), I tried:
RUN uv pip install elastic-apm
but the response is:
error: failed to create file /app/venv/.lock
Caused by: Permission denied (os error 13)

Same for the weblate_customization package:
RUN uv pip install /usr/lib/python3.12/site-packages/weblate_customization/ -editable
error: failed to create file /app/venv/.lock
Caused by: Permission denied (os error 13)

I have also looked up the documentation, but there UV is not mentioned at all:
https://docs.weblate.org/en/latest/admin/customize.html

Expected behavior

I would expect I can simply install the elastic-apm package and custom Weblate modules without altering file permissions or changing user rights.

Screenshots

No response

Exception traceback

No response

Additional context

No response

[nijel]

Migration to uv wasn't supposed to change this. Neither installation should work with UID 1000 which is used by the container. You should first change UID to 0 before doing changes to the system. This is documented in https://docs.weblate.org/en/latest/admin/install/docker.html#overriding-settings-by-extending-the-docker-image (but the docs wasn't updated for uv).

[nijel]

I've updated the docs WeblateOrg/weblate@177dff0

[wilcopots]

Thank you for the fast response, that did work for me!

[github-actions]

The issue you have reported is now resolved. If you don’t feel it’s right, please follow its labels to get a clue for further steps.

• In case you see a similar problem, please open a separate issue.
• If you are happy with the outcome, don’t hesitate to support Weblate by making a donation.