nixpkgs: Check overlays types
This seems to be a common mistake and is worth checking so we can provide a better error message.
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@ -49,6 +49,15 @@ let # Rename the function arguments
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in let
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lib = import ../../lib;
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throwIfNot = b: msg: if b then x: x else throw msg;
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checked =
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throwIfNot (lib.isList overlays) "The overlays argument to nixpkgs must be a list."
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lib.foldr (x: throwIfNot (lib.isFunction x) "All overlays passed to nixpkgs must be functions.") (r: r) overlays
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throwIfNot (lib.isList crossOverlays) "The crossOverlays argument to nixpkgs must be a list."
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lib.foldr (x: throwIfNot (lib.isFunction x) "All crossOverlays passed to nixpkgs must be functions.") (r: r) crossOverlays
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;
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localSystem = lib.systems.elaborate args.localSystem;
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# Condition preserves sharing which in turn affects equality.
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@ -121,4 +130,4 @@ in let
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pkgs = boot stages;
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in pkgs
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in checked pkgs
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