Woot; success! After several failed attempts, I got to:
$ koji add-tag-inheritance --priority=2 f21-build f21-released
$ koji list-tag-inheritance f21-build
f21-build (7)
├─f21 (6)
│ └─f20 (1)
└─f21-released (10)
I tried a scratch build targeting f21 and now my BuildRequires is satisfied through
inheritance of f21-released and it worked. So to test my understanding, I believe:
* having f21 inherit from f20 is mostly useful so that you don't have to "koji
add-pkg ..." (and likely more) everything again.
* inheritance also allows the parent tags of a build tag help resolve build deps
Please correct me if I'm wrong.
Also the priorities involved in inheritance are a bit mysterious. I merely guessed at a
priority when adding the inheritance above. I don't see any means from the CLI with
which to show the inheritance priorities, nor any indication if a lower number indicates a
lower or a higher priority.