Cleanup CLI package

[sashayakovtseva]

1. Introduce common errors for each CLI call

[pisarukv]

2. Move init to the top of the file :)
3. Overall, return nil errors only in case of successful execution.
4. Call os.Exit, log.Fatal only in main or somewhere near it.

[jscook2345]

@sashayakovtseva @cali4888

I think these are good things to do in general, not just in the cli package.

Something to consider while you do this work: Is it possible to introduce lint rules or create lint rules with our linter to make sure we avoid some of these issues in the future?

[carterpeel]

Hello,

This is a templated response that is being sent out to all open issues. We are working hard on 'rebuilding' the Singularity community, and a major task on the agenda is finding out what issues are still outstanding.

Please consider the following:

1. Is this issue a duplicate, or has it been fixed/implemented since being added?
2. Is the issue still relevant to the current state of Singularity's functionality?
3. Would you like to continue discussing this issue or feature request?

Thanks, Carter

[stale[bot]]

This issue has been automatically marked as stale because it has not had activity in over 60 days. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[pedroalvesbatista]

@sashayakovtseva Still getting this problem ? Have this been solved already ? If yes, what work around have you followed and applied ?

We're looking into the issue carefully, soon will bring to community and discuss ways to better solve as well address this. Thankyou for keeping the interest in the subject.

[kmuriki]

Moved to the new Apptainer repo issue https://github.com/apptainer/apptainer/issues/1157