[RFE] Support for wildcard in volume ls --filter label=key

[mskarbek]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind feature

Description

Labels, following k8s standard, have prefix and name parts separated with /. Podman does not enforce strict k8s rules for volume labels, so I'm able to add another part after either / or : depending on which convention I would like to use.
I would like to be able to list all volumes marked with label some.prefix.com/key/* or some.prefix.com/key:*.
This functionality doesn't have to implement full RegEx just simple catch all in place of wildcard.

[flouthoc]

@mskarbek The use case you have specified could be easily matched with HasPrefix but nothing is stopping users from making a query like */secondlabel/anotherlabel/ so i am afraid we will end up implementing regex for this.

I am not also sure if there were any intentions so support multiple labels using delimiters but I'd agree it would be cool thing to add. I'd wait for podman-maintainers perspective on this one.

Thanks for creating the issue.

[flouthoc]

@mskarbek also just to clarify are you expecting wildcards in label keys ?

[mskarbek]

@flouthoc yes, I had keys in mind.

[rhatdan]

Wouldn't piping to grep do what you want? Or do you need this in the API?

[mskarbek]

It's a convenience request for API and Ansible use cases. Ofc it can be worked around.

[rhatdan]

@jwhonce WDYT?

[flouthoc]

@mskarbek Could you please try above patch. Above patch adds supports to perform pattern based matching on keys. While keeps original behavior intact.