systems: allow passing in string for cross/localSystem

This makes things a little bit more convenient. Just pass in like: $ nix-build ’<nixpkgs>’ -A hello --argstr localSystem x86_64-linux --argstr crossSystem aarch64-linux
2019-06-04 11:17:25 -04:00
parent 40271ae138
commit 635b762569
3 changed files with 8 additions and 5 deletions
@@ -85,6 +85,7 @@ import ./. (builtins.removeAttrs args [ "system" "platform" ] // {
  inherit config overlays crossSystem crossOverlays;
  # Fallback: Assume we are building packages on the current (build, in GNU
  # Autotools parlance) system.
-  localSystem = (if args ? localSystem then {}
-                 else { system = builtins.currentSystem; }) // localSystem;
+  localSystem = if builtins.isString localSystem then localSystem
+                else (if args ? localSystem then {}
+                      else { system = builtins.currentSystem; }) // localSystem;
 })