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lib/modules.nix: Add file context to unmerged values in mergeDefinitions

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This helps with troubleshooting exceptions in config values, which were hard
to track down for options with many definitions.
The trace will look like:

    error: while evaluating the attribute 'config.foo' at undefined position:
    [...]
    while evaluating the option `foo':
    [...]
    while evaluating definitions from `/home/user/mymod.nix':
    while evaluating 'dischargeProperties' at /home/user/nixpkgs/lib/modules.nix:464:25, called from /home/user/nixpkgs/lib/modules.nix:392:137:
    while evaluating the attribute 'value' at /home/user/nixpkgs/lib/modules.nix:277:44:
    Value error!

where the `/home/user/mymod.nix` module is

    { lib, ... }: {
      options.foo = lib.mkOption {
        type = lib.types.lines;
      };
      config.foo = builtins.throw "Value error!";
    }
This commit is contained in:
Robert Hensing 2020-02-24 00:15:36 +01:00
parent a9b0ccd68e
commit 9c0ab2f26d
1 changed files with 1 additions and 1 deletions
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2
lib/modules.nix
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@ -389,7 +389,7 @@ rec {
let let
# Process mkMerge and mkIf properties. # Process mkMerge and mkIf properties.
defs' = concatMap (m: defs' = concatMap (m:
map (value: { inherit (m) file; inherit value; }) (dischargeProperties m.value) map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
) defs; ) defs;
# Process mkOverride properties. # Process mkOverride properties.