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authorMatthew Bauer <mjbauer95@gmail.com>2019-06-04 11:10:03 -0400
committerMatthew Bauer <mjbauer95@gmail.com>2019-06-04 11:17:25 -0400
commit635b7625690d9f8f61da0a187e7ed4a7ec274fdc (patch)
tree80c1dc0918f028b38aa23b3abdae327fc24550dc /pkgs/top-level
parent40271ae1382b14673b7b3f9edb6c1f9bba1bbe47 (diff)
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
Diffstat (limited to 'pkgs/top-level')
-rw-r--r--pkgs/top-level/default.nix4
-rw-r--r--pkgs/top-level/impure.nix5
2 files changed, 5 insertions, 4 deletions
diff --git a/pkgs/top-level/default.nix b/pkgs/top-level/default.nix
index b6de076a570c6..904ef8d39796d 100644
--- a/pkgs/top-level/default.nix
+++ b/pkgs/top-level/default.nix
@@ -57,11 +57,11 @@ in let
 
   # From a minimum of `system` or `config` (actually a target triple, *not*
   # nixpkgs configuration), infer the other one and platform as needed.
-  localSystem = lib.systems.elaborate (
+  localSystem = lib.systems.elaborate (if builtins.isAttrs args.localSystem then (
     # Allow setting the platform in the config file. This take precedence over
     # the inferred platform, but not over an explicitly passed-in one.
     builtins.intersectAttrs { platform = null; } config1
-    // args.localSystem);
+    // args.localSystem) else args.localSystem);
 
   crossSystem = if crossSystem0 == null then localSystem
                 else lib.systems.elaborate crossSystem0;
diff --git a/pkgs/top-level/impure.nix b/pkgs/top-level/impure.nix
index da288f15d2e2b..3ba6c08a140b2 100644
--- a/pkgs/top-level/impure.nix
+++ b/pkgs/top-level/impure.nix
@@ -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;
 })