Best way to symlink or alias default python?

[Frank Fineis]

Hello,

I'm a singularity novice, have mercy! I'm just trying to symlink (or alias) /usr/bin/python3 -> /usr/bin/python. I know I could bootstrap the python:latest Docker image that sets the symlink for me, but I'd rather have a way to do it using another base.

Building the container and running the container like this doesn't work:

Bootstrap: docker

From: ubuntu:latest

%post

    apt-get -y update && apt-get -y install python3

% environment

%runscript

    ln -s python3 /usr/bin/python

    exec python --version

because /usr/bin is read-only.

And then when I try just aliasing:

Bootstrap: docker

From: ubuntu:latest

%post

    apt-get -y update && apt-get -y install python3

% environment

%runscript

    alias python=python3

    exec python --version

I still get error - "exec: python: not found" (the alias wasn't set). When I shell into the container, I can alias python. Don't want to edit the user's .bashrc file or anything.

Any advice? Thanks!

- Frank

[v]

Have you tried doing the symlink in the %post section? Then it should work when you use the runscript.

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Vanessa Villamia Sochat
Stanford University '16

(603) 321-0676

[Frank Fineis]

I'm a dummy, that was it! Of course that should have worked, because we have the ability to install anything in post. Thanks for your help!

[v]

Of course, anytime! I'm very glad to help :)