disallow unknown config fields

.goreleaser.yaml

@@ -20,3 +20,8 @@ changelog:
     exclude:
       - "^docs:"
       - "^test:"
+archives:
+  - files:
+      - LICENSE*
+      - README*
+      - examples/**/*

internal/app/main.go

@@ -95,13 +95,15 @@ func loadConfig(file string) (string, cuegen.Config, error) {
 	if fileInfo.IsDir() {
 		file = filepath.Join(file, defaultCuegenFile)
 	}
-	data, err := os.ReadFile(file)
+	fh, err := os.Open(file)
 	if err != nil {
 		return "", cuegen.Config{}, err
 	}
 	config := cuegen.Config{}
-	if err := yaml.Unmarshal(data, &config); err != nil {
-		return "", cuegen.Config{}, fmt.Errorf("unmarshal config: %v", err)
+	decoder := yaml.NewDecoder(fh)
+	decoder.KnownFields(true)
+	if err := decoder.Decode(&config); err != nil {
+		return "", cuegen.Config{}, err
 	}
 	return file, config, nil
 }

tests/local/config-objectsPath.txtar

@@ -12,14 +12,21 @@ stdout 'a: b'
 exec cuegen chart/cuegen3.yaml
 stdout 'c: d'
 
+# config: no objectsPath
+! exec cuegen chart/cuegen4.yaml
+stderr 'loadconfig: EOF'
+
 -- chart/cuegen1.yaml --
+debug: false
 
 -- chart/cuegen2.yaml --
 objectsPath: objects
 
 -- chart/cuegen3.yaml --
 objectsPath: otherPath
 
+-- chart/cuegen4.yaml --
+
 -- chart/a.cue --
 package kube