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nixpkgs: Check overlays types

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This seems to be a common mistake and is worth checking so we can
provide a better error message.
This commit is contained in:
Robert Hensing 2021-12-22 12:52:06 +01:00
parent d4c6319803
commit cf73196411
1 changed files with 10 additions and 1 deletions
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11
pkgs/top-level/default.nix
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@ -49,6 +49,15 @@ let # Rename the function arguments
in let in let
lib = import ../../lib; lib = import ../../lib;
throwIfNot = b: msg: if b then x: x else throw msg;
checked =
throwIfNot (lib.isList overlays) "The overlays argument to nixpkgs must be a list."
lib.foldr (x: throwIfNot (lib.isFunction x) "All overlays passed to nixpkgs must be functions.") (r: r) overlays
throwIfNot (lib.isList crossOverlays) "The crossOverlays argument to nixpkgs must be a list."
lib.foldr (x: throwIfNot (lib.isFunction x) "All crossOverlays passed to nixpkgs must be functions.") (r: r) crossOverlays
;
localSystem = lib.systems.elaborate args.localSystem; localSystem = lib.systems.elaborate args.localSystem;
# Condition preserves sharing which in turn affects equality. # Condition preserves sharing which in turn affects equality.
@ -121,4 +130,4 @@ in let
pkgs = boot stages; pkgs = boot stages;
in pkgs in checked pkgs