`pip-containerize update` fails with a `--slim` container

[maciejjan]

On Puhti (Tykky v0.3.2) any attempt to call pip-containerize update on a container created with a --slim flag throws an error about not being able to find Python.

How to reproduce

module purge
module load tykky
pip-containerize new --slim --prefix tykky_test requirements.txt
pip-containerize update --post-install extra.txt tykky_test

Fails with:

/PUHTI_TYKKY_vYJJ0DS/_post_install.sh: /PUHTI_TYKKY_vYJJ0DS/env1/bin/pip: /PUHTI_TYKKY_vYJJ0DS/env1/bin/python3: bad interpreter: No such file or directory

This seems to be independent of what packages requirements.txt and extra.txt contain. I'm attaching examples with very simple packages.

requirements.txt
extra.txt

The error does not occur if the container is created without the --slim flag.

[Nortamo]

Good catch.

The tool is only propagating a set amount of configs when updating existing installatio, by developer oversight 🤦 , the isolation status was not being propagated -> /usr/local/bin was being pulled in from the host when updating.

I don't know how much this feature is used, but I bumped the version of python used for the slim image
and introduced a flag for overriding the python container version.

I.e. --slim --pyver 3.14.0a4-slim-bookworm

Fixed in #32