NixOS/nixpkgs — pull request #3764 by aszlig (2014-08-24 15:58:14+00:00)
Title: nixos: Create firmware output path without links.

Especially when `${kernel}/lib/firmware` is referenced, the store path for firmware could get quite large (>= 150 MB on `x86_64-linux`), and for example in VM tests this closure will end up being included in the initrd.

Instead of building up a link farm, we now just dereference/copy over all files into the firmware closure.

Fixes a regression introduced by PR #3505.