Add Sarus support?

[marcodelapierre]

Sarus is the container HPC runtime developed at the Swiss Supercomputing Centre, CSCS: https://sarus.readthedocs.io/en/stable/

[marcodelapierre]

just a note, I think I will be able to help with testing for this one, I can get a Sarus deployment on a VM if needed.

[vsoch]

Great! I've never used sarus before, but I'm planning on installing it on my local machine. Which (by the end of this project) will be chock full of different container technologies!

[vsoch]

Note to link to issue - sarus does not currently support pulling a specific digest: eth-cscs/sarus#1. We can try pulling tags for now (and putting a warning) but hopefully this will be supported at some point!

[marcodelapierre]

Starting to document functionalities in Sarus, by memory of ~ 2 yo tests I ran,
and also using a bit of docos: https://sarus.readthedocs.io/en/stable/user/user_guide.html :

• pull: sarus pull <repo>:<tag> (digests still not supported apparently)
• execute: sarus run <repo>:<tag> <cmd>
• shell: sarus run -t <repo>:<tag> <shell>
• execute default command:sarus run <repo>:<tag> (OCI behaviour as Docker; entrypoint can be overridden with --entrypoint=<cmd>, and removed with --entrypoint "")
• add variables in container: apparently N/A
• default work directory: can be forced using -w <directory>
• host directory mounts: can be set with syntax like --mount=type=bind,source=/path/to/my/data,destination=/data
• GPU apps: work out of the box if Sarus is configured for that

[vsoch]

Yeah the non pull of a digest was unfortunately my stopping point. Although to think of it now, we could probably try something similar to Podman with pulling and then tagging.