Python run fails because the installation does not have required system dependencies

Start by reproducing the failure with trial.Dockerfile and pkgm install python@3.12, then inspect how the package is installed in the pkgxdev/pkgx image and how its shared library is exposed. Done means the Docker build completes and prints "hello world" without the missing libpython3.12.so.1.0 error.

Python 3.12 installed via pkgx does not work within docker. Python run fails with message

python: error while loading shared libraries: libpython3.12.so.1.0: cannot open shared object file: No such file or directory

Simulation steps

• Create a docker file named trial.Dockerfile with the following contents

FROM pkgxdev/pkgx

RUN pkgm install python@3.12

RUN python -c 'print("hello world")'

• Run command docker build -f trial.Dockerfile -t trial:latest .

Expected behaviour

Docker build must be successful and "hello world" must be printed

Actual behaviour

Errors out with message python: error while loading shared libraries: libpython3.12.so.1.0: cannot open shared object file: No such file or directory

Full log

[+] Building 1.2s (6/6) FINISHED                                                                                                               docker:colima
 => [internal] load build definition from trial.Dockerfile                                                                                              0.0s
 => => transferring dockerfile: 128B                                                                                                                    0.0s
 => [internal] load metadata for docker.io/pkgxdev/pkgx:latest                                                                                          0.9s
 => [internal] load .dockerignore                                                                                                                       0.0s
 => => transferring context: 2B                                                                                                                         0.0s
 => [1/3] FROM docker.io/pkgxdev/pkgx:latest@sha256:3cb64e57aede0ce66da3e5be729d7f72d46119a1583aa69e69b60e7d419d58b2                                    0.0s
 => CACHED [2/3] RUN pkgm install python@3.12                                                                                                           0.0s
 => ERROR [3/3] RUN python -c 'print("hello world")'                                                                                                    0.2s
------                                                                                                                                                       
 > [3/3] RUN python -c 'print("hello world")':
0.158 python: error while loading shared libraries: libpython3.12.so.1.0: cannot open shared object file: No such file or directory
------
trial.Dockerfile:5
--------------------
   3 |     RUN pkgm install python@3.12
   4 |     
   5 | >>> RUN python -c 'print("hello world")'
--------------------
ERROR: failed to build: failed to solve: process "/bin/sh -c python -c 'print(\"hello world\")'" did not complete successfully: exit code: 127

Possible fix

• I recommend using https://github.com/astral-sh/python-build-standalone or https://github.com/astral-sh/uv (which internally uses python-build-standalone) to install python without worrying about system dependency hell.