> The simplest way to do it would be by walking the package DAG: start
> from ‘foo’, accumulate its ‘package-source’, then traverse its inputs,
> etc.  Recursion would stop at the implicit inputs (GCC, glibc,
> Coreutils, etc.), though.

> If you’d like implicit inputs to be taken into account, then you’d have
> to traverse derivations.  It’s less convenient because it’s lower-level.

Is there a function that accepts a package name and returns a list of
implicit inputs?