A change of `commitIdFromGitRepo` in nixpkgs/lib/sources.nix
resulted in the error message
"attribute '.git' missing at nixpkgs/lib/sources.nix:7:32" when
executing darwin-rebuils switch.
The commit with the change is
c9214c394b
Removing the trailing slash resolves the error.
Since named entries can be overridden now based on ordering now merging
is only a problem for removing one of the default search paths, in which
case a higher priority eg. mkForce can be used.
{
nix.nixPath = [{ darwin-config = "/darwin.nix"; }];
}
Will result in
[ "darwin-config=/darwin.nix" "/nix/var/nix/profiles/per-user/root/channels" "$HOME/.nix-defexpr/channels" ]
Fixes#137
