RHOAIENG-9707: chore(tests/containers): try to install the cowsay package to check the python venv is writable

[jiridanek]

https://issues.redhat.com/browse/RHOAIENG-9707

Description

  _________________________________________________
 /                                                 \
| Checks that the Python virtualenv in the image is |
|  writable.                                        |
 \                                                 /
  =================================================
                                                 \
                                                  \
                                                    ^__^
                                                    (oo)\_______
                                                    (__)\       )\/\
                                                        ||----w |
                                                        ||     ||

How Has This Been Tested?

• https://github.com/jiridanek/notebooks/actions/runs/13027115997

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

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[jstourac]

LGTM, just wondering whether we should rather/also check the variant where python3 isn't used in the command. I mean, when user will simply execute pip install cowsay and then cowsay -t Hello. Technically these results should be identical as the very same python env should be used in both cases. 🤔

[jiridanek]

We should rather/also check the variant where python3 isn't used in the command. I mean, when user will simply execute pip install cowsay and then cowsay -t Hello.

I don't know. @opendatahub-io/notebook-devs, thoughts? Thanks.

[openshift-ci]

@jiridanek: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/images	a171ed9	link	true	/test images

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[daniellutz]

from my understanding, the python3 -m pip install command would be more reliable, because you are already specifying the desired python version on it, and to me, technically, python3 -m pip install and pip install would be the same, so no issues regarding that, from my understanding.

this one looks good to me!

/lgtm

[jiridanek]

because you are already specifying the desired python version on it

we're already in a python virtual environment when the image starts, and that sets up PATH to /opt/app-root/bin, where pip is present; so although in general case python3 -m pip is preferable, and /opt/app-root/bin/python3 -m pip is even better, in this case should be all the same.

the setting of python virtual env for auto activation is done through some magic around BASH_ENV variable.

    # The following echo adds the unset command for the variables set below to the \
    # venv activation script. This is inspired from scl_enable script and prevents \
    # the virtual environment to be activated multiple times and also every time \
    # the prompt is rendered. \
    echo "unset BASH_ENV PROMPT_COMMAND ENV" >> ${APP_ROOT}/bin/activate

# For RHEL/Centos 8+ scl_enable isn't sourced automatically in s2i-core
# so virtualenv needs to be activated this way
ENV BASH_ENV="${APP_ROOT}/bin/activate" \
    ENV="${APP_ROOT}/bin/activate" \
    PROMPT_COMMAND=". ${APP_ROOT}/bin/activate"

https://github.com/sclorg/s2i-python-container/blob/master/3.11/Dockerfile.rhel9#L84-L94

I was looking into it for

• RHOAIENG-10350 feat(Dockerfiles): switch from s2i python images to plain ubi/c9s bases #641