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add support for assertions and warnings
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commit
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1 changed files with 31 additions and 2 deletions
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@ -8,6 +8,12 @@ let
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cfg = config.system;
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cfg = config.system;
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failedAssertions = map (x: x.message) (filter (x: !x.assertion) config.assertions);
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throwAssertions = res: if (failedAssertions != []) then throw "\nFailed assertions:\n${concatStringsSep "\n" (map (x: "- ${x}") failedAssertions)}" else res;
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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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@ -42,11 +48,34 @@ in
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default = pkgs.lib.nixpkgsVersion;
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default = pkgs.lib.nixpkgsVersion;
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};
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};
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assertions = mkOption {
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type = types.listOf types.unspecified;
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internal = true;
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default = [];
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example = [ { assertion = false; message = "you can't enable this for that reason"; } ];
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description = ''
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This option allows modules to express conditions that must
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hold for the evaluation of the system configuration to
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succeed, along with associated error messages for the user.
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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.str;
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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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system.build.toplevel = stdenvNoCC.mkDerivation {
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system.build.toplevel = throwAssertions (showWarnings (stdenvNoCC.mkDerivation {
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name = "darwin-system-${cfg.darwinLabel}";
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name = "darwin-system-${cfg.darwinLabel}";
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preferLocalBuild = true;
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preferLocalBuild = true;
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@ -80,7 +109,7 @@ in
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echo -n "$darwinLabel" > $out/darwin-version
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echo -n "$darwinLabel" > $out/darwin-version
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echo -n "$system" > $out/system
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echo -n "$system" > $out/system
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'';
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'';
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};
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}));
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};
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};
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}
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}
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