Allow modules to define warnings to be shown during evaluation
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@ -6,6 +6,8 @@ let
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failed = map (x: x.message) (filter (x: !x.assertion) config.assertions);
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failed = map (x: x.message) (filter (x: !x.assertion) config.assertions);
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showWarnings = res: fold (w: x: builtins.trace "[1;31mwarning: ${w}[0m" x) res config.warnings;
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in
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in
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{
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{
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@ -24,14 +26,26 @@ in
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'';
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'';
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};
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};
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warnings = mkOption {
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internal = true;
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default = [];
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type = types.listOf types.string;
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example = [ "The `foo' service is deprecated and will go away soon!" ];
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description = ''
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This option allows modules to show warnings to users during
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the evaluation of the system configuration.
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'';
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};
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};
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};
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config = {
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config = {
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# This option is evaluated always. Thus the assertions are checked as well. hacky!
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# This option is evaluated always. Thus the assertions are checked
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environment.systemPackages =
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# as well. Hacky!
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environment.systemPackages = showWarnings (
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if [] == failed then []
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if [] == failed then []
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else throw "\nFailed assertions:\n${concatStringsSep "\n" (map (x: "- ${x}") failed)}";
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else throw "\nFailed assertions:\n${concatStringsSep "\n" (map (x: "- ${x}") failed)}");
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};
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};
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