[FR] Using Docker labels like WUD to add container to watched list and support for update links

[UtkarshVerma]

Is your feature request related to a problem? Please describe.
I have a lot of containers on my machine and I only want Cup to watch containers that I explicitly specify in my compose files. With WUD, it supports labels so I use them because it keeps the config distributed which makes it easy to understand for locality purposes. Also, would it be possible to add a link to the container updates? For UX purposes, I always link to the release notes in WUD which saves me a few clicks when I am updating containers. It is a huge help when there are multiple updates.

Describe the solution you'd like
Since we already have access to the Docker socket, we could implement support for container config using Docker labels and only watch updates for these containers. These are the labels which WUD supports:
https://getwud.github.io/wud/#/configuration/watchers/?id=labels

I rely on the following labels:

• wud.watch
• wud.link.template: https://github.com/sergi0g/cup/releases/tag/v$${major}.$${minor}.$${patch}
• wud.display.name and wud.display.icon: Optional, but makes it look nicer, especially with selfh.st/icons.

Describe alternatives you've considered
WUD

Additional context

This is how the link is rendered.

[sergi0g]

Hey @UtkarshVerma,

I agree that this would be a useful feature, although an implementation would be quite different from what you currently have in mind.

Cup is something external to your containers and having a centralized configuration makes setup and maintenance much easier. You just go and edit whatever you want, without the need to redeploy your containers.

Currently, the only image-specific option applicable is excluding an image, so the practical benefits are basically non-existent.

Release note link templates are a nice idea, but I'd rather have something more automated. Cup aims to require no image-specific configuration, so manually specifying a URL for every image is not ideal. Currently Cup supports displaying the link from the org.opencontainers.image.url label if it is specified, where you can usually get to the release notes in a few clicks. Not perfect, but it's better than manually looking up the image.

Display names and icons are features that I think go slightly out of the scope of this project. They're hard to implement in the design and they can be a source of conflicts too. I'd rather not go into that territory. I might consider adding support for other org.opencontainers.image labels.

Sorry if I may have sounded too negative above, but to be clear, I'm not saying that this won't eventually be implemented, but for the time being, it's a low priority feature.

[UtkarshVerma]

Hi Sergio,

Thanks for the quick response. I mostly created the issue just as a starting point so that others may chip in and so on. It's an open source project and quite polished for something you do as a hobby. I have no issues waiting until it is implemented, no matter how long it takes. For my personal usage, I will stick with WUD for now.

Thanks and regards,
Utkarsh