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lib.modules: Explain why options can only be merged into submodules

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Robert Hensing 2022-02-24 14:50:40 +01:00
parent 0c09eb343d
commit 81f342d1f3
1 changed files with 9 additions and 0 deletions
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9
lib/modules.nix
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@ -501,6 +501,15 @@ rec {
}
else if optionDecls != [] then
if (lib.head optionDecls).options.type.name == "submodule"
# Raw options can only be merged into submodules. Merging into
# attrsets might be nice, but ambiguous. Suppose we have
# attrset as a `attrsOf submodule`. User declares option
# attrset.foo.bar, this could mean:
# a. option `bar` is only available in `attrset.foo`
# b. option `foo.bar` is available in all `attrset.*`
# c. reject and require "<name>" as a reminder that it behaves like (b).
# d. magically combine (a) and (c).
# All options are merely syntax sugar though.
then
let opt = fixupOptionType loc (mergeOptionDecls loc (map optionTreeToOption decls));
in {