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modules: Add mkSinkUndeclaredOptions.

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This commit is contained in:
Nicolas B. Pierron 2014-12-21 14:50:46 +01:00
parent f94580da69
commit 2f365923d6
1 changed files with 17 additions and 0 deletions
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17
lib/options.nix
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@ -31,6 +31,23 @@ rec {
type = lib.types.bool;
};
# This option accept anything, but it does not produce any result. This
# is useful for sharing a module across different module sets without
# having to implement similar features as long as the value of the options
# are not expected.
mkSinkUndeclaredOptions = attrs: mkOption ({
internal = true;
visible = false;
default = false;
description = "Sink for option definitions.";
type = mkOptionType {
name = "sink";
check = x: true;
merge = loc: defs: false;
};
apply = x: throw "Option value is not readable because the option is not declared.";
} // attrs);
mergeDefaultOption = loc: defs:
let list = getValues defs; in
if length list == 1 then head list