multiproduct_kati support for a custom list of products

Test: multiproduct_kati --products="aosp_arm,aosp_arm64"
Bug: 67478260
Change-Id: Icf7b8b0c30a2dc8e093ab109172675ff74f43adc

cmd/multiproduct_kati/main.go

@@ -56,6 +56,7 @@ var onlySoong = flag.Bool("only-soong", false, "Only run product config and Soon
 var buildVariant = flag.String("variant", "eng", "build variant to use")
 
 var skipProducts = flag.String("skip-products", "", "comma-separated list of products to skip (known failures, etc)")
+var includeProducts = flag.String("products", "", "comma-separated list of products to build")
 
 const errorLeadingLines = 20
 const errorTrailingLines = 20
@@ -158,6 +159,15 @@ func (s *Status) Finished() int {
 	return s.failed
 }
 
+func inList(str string, list []string) bool {
+	for _, other := range list {
+		if str == other {
+			return true
+		}
+	}
+	return false
+}
+
 func main() {
 	log := logger.New(os.Stderr)
 	defer log.Cleanup()
@@ -222,7 +232,24 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	productsList := strings.Fields(vars["all_named_products"])
+	var productsList []string
+	allProducts := strings.Fields(vars["all_named_products"])
+
+	if *includeProducts != "" {
+		missingProducts := []string{}
+		for _, product := range strings.Split(*includeProducts, ",") {
+			if inList(product, allProducts) {
+				productsList = append(productsList, product)
+			} else {
+				missingProducts = append(missingProducts, product)
+			}
+		}
+		if len(missingProducts) > 0 {
+			log.Fatalf("Products don't exist: %s\n", missingProducts)
+		}
+	} else {
+		productsList = allProducts
+	}
 
 	products := make([]string, 0, len(productsList))
 	skipList := strings.Split(*skipProducts, ",")