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-rw-r--r--nixos/modules/misc/nixpkgs.nix7
-rw-r--r--nixos/modules/misc/nixpkgs/test.nix6
2 files changed, 12 insertions, 1 deletions
diff --git a/nixos/modules/misc/nixpkgs.nix b/nixos/modules/misc/nixpkgs.nix
index e8becb6bf8cc7..5bd7eb1408b2a 100644
--- a/nixos/modules/misc/nixpkgs.nix
+++ b/nixos/modules/misc/nixpkgs.nix
@@ -55,6 +55,11 @@ let
     check = builtins.isAttrs;
   };
 
+  # Whether `pkgs` was constructed by this module - not if nixpkgs.pkgs or
+  # _module.args.pkgs is set. However, determining whether _module.args.pkgs
+  # is defined elsewhere does not seem feasible.
+  constructedByMe = !opt.pkgs.isDefined;
+
   hasBuildPlatform = opt.buildPlatform.highestPrio < (mkOptionDefault {}).priority;
   hasHostPlatform = opt.hostPlatform.isDefined;
   hasPlatform = hasHostPlatform || hasBuildPlatform;
@@ -358,7 +363,7 @@ in
         }
       )
       {
-        assertion = hasPlatform -> legacyOptionsDefined == [];
+        assertion = constructedByMe -> hasPlatform -> legacyOptionsDefined == [];
         message = ''
           Your system configures nixpkgs with the platform parameter${optionalString hasBuildPlatform "s"}:
           ${hostPlatformLine
diff --git a/nixos/modules/misc/nixpkgs/test.nix b/nixos/modules/misc/nixpkgs/test.nix
index 9e8851707f8fc..a6d8877ae0700 100644
--- a/nixos/modules/misc/nixpkgs/test.nix
+++ b/nixos/modules/misc/nixpkgs/test.nix
@@ -59,5 +59,11 @@ lib.recurseIntoAttrs {
           For a future proof system configuration, we recommend to remove
           the legacy definitions.
         ''];
+    assert getErrors {
+        nixpkgs.localSystem = pkgs.stdenv.hostPlatform;
+        nixpkgs.hostPlatform = pkgs.stdenv.hostPlatform;
+        nixpkgs.pkgs = pkgs;
+      } == [];
+
     pkgs.emptyFile;
 }