> On second thought, the whole idea of applying grafts on the final result > (instead of applying grafts at each step like we do now) doesn’t fly. > It works well for things like a profile or the system derivation, but > breaks for less trivial things. > For example, if you’re building a VM image or a binary tarball, you > really need to graft packages early on; trying to graft the VM image or > binary tarball wouldn’t have the desired effect. Isn't a system derivation or a profile derivation an intermediate step to these derivations? Can't there be a flag or something called #:already-grafted? #t?