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lib/options: Better mergeEqualOption error for uncomparable types

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For an option definition that uses `lib.options.mergeEqualOption`
underneath, like `types.anything`, an error is thrown when multiple
functions are assigned, indicating that functions can't be compared for
equivalence:

  error: The option `test' has conflicting definition values:
  - In `xxx': <function>
  - In `xxx': <function>
  (use '--show-trace' to show detailed location information)

However, the error message didn't use the correct files. While above
error indicates that both definitions are in the xxx file, that's in
fact not true. Above error was generated with

  options.test = lib.mkOption {
    type = lib.types.anything;
  };

  imports = [
    {
      _file = "yyy";
      test = y: y;
    }
    {
      _file = "xxx";
      test = x: x;
    }
  ];

With this change, the error uses the correct file locations:

  error: The option `test' has conflicting definition values:
  - In `xxx': <function>
  - In `yyy': <function>
  (use '--show-trace' to show detailed location information)
This commit is contained in:
Silvan Mosberger 2021-08-10 19:54:32 +02:00
parent ebc72941f0
commit 998a9c1707
1 changed files with 2 additions and 1 deletions
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3
lib/options.nix
View file

@ -11,6 +11,7 @@ let
filter
foldl'
head
tail
isAttrs
isBool
isDerivation
@ -144,7 +145,7 @@ rec {
if def.value != first.value then
throw "The option `${showOption loc}' has conflicting definition values:${showDefs [ first def ]}"
else
first) (head defs) defs).value;
first) (head defs) (tail defs)).value;
/* Extracts values of all "value" keys of the given list.