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flake.nix: Only add _file
-key if position of args.modules
is actually known to the evaluator
This happens if the evaluator "loses" the position of an
attr-declaration[1] because of e.g. too many nested function-calls to
build the final attr-set.
While the actual issue should be fixed in Nix itself, this is IMHO a
fair workaround to unblock affected users[2].
[1] e14c245934 (commitcomment-53645936)
[2] It seems as everyone using `divnix/digga` or `flake-utils-plus`
are affected:
* https://github.com/divnix/digga/issues/87
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parent
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10
flake.nix
10
flake.nix
@ -49,12 +49,18 @@
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})).config;
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moduleDeclarationFile =
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(builtins.unsafeGetAttrPos "modules" args).file;
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let
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# Even though `modules` is a mandatory argument for `nixosSystem`, it doesn't
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# mean that the evaluator always keeps track of its position. If there
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# are too many levels of indirection, the position gets lost at some point.
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intermediatePos = builtins.unsafeGetAttrPos "modules" args;
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in
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if intermediatePos == null then null else intermediatePos.file;
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# Add the invoking file as error message location for modules
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# that don't have their own locations; presumably inline modules.
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addModuleDeclarationFile =
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m: {
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m: if moduleDeclarationFile == null then m else {
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_file = moduleDeclarationFile;
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imports = [ m ];
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};
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