Excerpts from Florian Friesdorf's message of Sat Jul 21 17:50:55 +0200 2012: > how do we get all packages using a derivation (e.g. python27) either > directly or indirectly? nix-store has some options. If that's not enough access /nix/var/nix/db/db.sqlite and run your own queries. Or patch nix-store. Marc Weber