[additionalimagestores] Allow global operations across all defined image stores

[srcshelton]

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

/kind feature

Description

It would also be useful to reconsider additionalimagestores as additional locations, rather than rigidly read-only locations.

So, for example, if podman image ls is used to view the unique IMAGE ID for an image in an additional image store, then podman image rm <ID> should remove the image linked to the specified ID (as the ID is unique) without having to specify --root and --storage-opt= options.

To ensure that this deletion is not performed by mistake, perhaps an extra argument could be required, such as:

podman image rm --all-stores <ID>

(… or --store=all, which could also allow a store to be selected by path, e.g. --store=/stoage/images).

See #9852 for context.

[rhatdan]

I believe this is adding too much complexity and can easily be fixed, by fixing the --root options to allows users to simply interact with other stores.

[srcshelton]

I'm kinda with you… for named images, having to specify --root to affect any secondary locations seems fine - button the same way it feels odd that when deleting by ID, a globally-unique identifier, an image visible from image ls can't be immediately removed.

I'll accept that the --store concept was perhaps taking things too far - but I'd still ask for consideration of being able to remove an image by ID if it is visible, regardless of the store it's in.

[rhatdan]

In my opinion, you don't know if the image is being shared with other users as well, so you really should know what you are doing before removing these images. One example might be that additional store is being shared with all rootless users on a system, or being shared over NFS to other systems or being shared inside of containers.
This was the idea when we were designing the system. Finally pluming this back into the storage layer would be very difficult, and I don't think there would be enough users to make it worth the effort.

[github-actions]

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