As a user, I want to know which distributions some content is in.

[newswangerd]

Is your feature request related to a problem? Please describe.
There is currently no easy way for clients to find which distributions provide a specific piece of content.

Describe the solution you'd like
Add a ?content_in= filter to the distributions APIs that allow users to specify a content HREF and get a list of distributions that contain the selected content.

Additional context
This is needed for repository management in galaxy ng.

[mdellweg]

As this is a query to the Distribution, i'd name the filter like with_content, has_content or serves_content or something like that.

[ipanova]

@lubosmj will take a crack at this.

[lubosmj]

Should we close this issue then: #2865 ?

[mdellweg]

Should we close this issue then: #2865 ?

No, the ask about querying repositories is a separate (and not as obvious) one. We may however cross the distribution off that other issues name.

[lubosmj]

Does it make sense to also allow users to filter distributions by not including specific content? So, in the end, we will support queries like this: distributions?content_in=!/pulp/href/123/.

[ipanova]

@lubosmj maybe in the future we will have a usecase for this, and it will be a separate filter, but for now i'd focus getting done distributions?with_content=pulp/href/123/.