self: super: let lib = super.lib; # This callPackage will try to detect obsolete overrides. callPackage = path: args: let override = super.callPackage path args; upstream = lib.optionalAttrs (override ? "name") (super.${(builtins.parseDrvName override.name).name} or {}); in if upstream ? "name" && override ? "name" && lib.compareVersions upstream.name override.name != -1 then builtins.trace "Upstream `${upstream.name}' gets overridden by `${override.name}'." override else override; subdirsOf = path: lib.mapAttrs (name: _: path + "/${name}") (lib.filterAttrs (_: x: x == "directory") (builtins.readDir path)); in lib.mapAttrs (_: lib.flip callPackage {}) (lib.filterAttrs (_: dir: lib.pathExists (dir + "/default.nix")) (subdirsOf ./.))