Function repo_row_declares_apply_sources 

pub fn repo_row_declares_apply_sources(r: &RepoRow) -> bool

What: Whether a [[repo]] row declares sources that participate in Apply (drop-in generation).

Inputs:

• r: Parsed row from repos.conf.

Output:

• true when server, local mirrorlist, or HTTP(S) mirrorlist_url is set per apply-plan rules.

Details:

• Mirrors apply-plan eligibility for sources; non-HTTP mirrorlist_url alone does not qualify.