Metadata Linter: A new linter in snapcraft to lint about missing metadata fields

[soumyaDghosh]

What needs to get done

Currently, there are a lot of snaps, without any proper metadata. Some snaps often even miss licenses. If we can lint about it, instead of making it mandatory for now, it'll not break any snaps and still can show users that they're missing these fields.

If the field was meant to be adopted from appstream metadata and there was some issue in adopting it, we can also lint about it here. We can also take this chance to improve the coverage of metadata from Appstream Metadatas.

Fields I think can be linted

• license
• title
• issues
• contact
• website
• apps.common-id

Why it needs to get done

We need proper listings of snaps, for several reasons:

• users can be well-informed about the snap
• the listing with screenshots can attract users
• companies/orgs/users can abide by licenses, if they have some strict license policies

With proper listing, the snap store can heavily improve its plethora of apps.