NixOS/nixops — pull request #169 by rickynils (2014-03-30 10:25:47+00:00)
Title: Use shell instead of nix-env for system profile setup

This makes it possible for nixops to activate systems
even if their Nix db is read-only. nix-env always
require write-access to the db, but since we already have
a built system path, we don't have to use nix-env to just
set up the system profile symlinks.