Move openapi output to a flag rather than tag

Makefile.generated_files

@@ -296,6 +296,7 @@ $(DEEPCOPY_GEN):
 # The result file, in each pkg, of open-api generation.
 OPENAPI_BASENAME := $(GENERATED_FILE_PREFIX)openapi
 OPENAPI_FILENAME := $(OPENAPI_BASENAME).go
+OPENAPI_OUTPUT_PKG := pkg/generated/openapi
 
 # The tool used to generate open apis.
 OPENAPI_GEN := $(BIN_DIR)/openapi-gen
@@ -321,6 +322,7 @@ gen_openapi: $(OPENAPI_FILES)
 	        --v $(KUBE_VERBOSE)                                         \
 	        --logtostderr                                               \
 	        -i $$(cat $(META_DIR)/$(OPENAPI_GEN).todo | paste -sd, -)   \
+	        -p $(PRJ_SRC_PATH)/$(OPENAPI_OUTPUT_PKG)                    \
 	        -O $(OPENAPI_BASENAME);                                     \
 	fi
 

cmd/libs/go2idl/openapi-gen/generators/openapi.go

@@ -30,7 +30,6 @@ import (
 	"k8s.io/gengo/namer"
 	"k8s.io/gengo/types"
 	"k8s.io/kubernetes/pkg/genericapiserver/openapi/common"
-	"k8s.io/kubernetes/pkg/util/sets"
 
 	"github.com/golang/glog"
 )
@@ -42,8 +41,6 @@ const tagName = "k8s:openapi-gen"
 const (
 	tagValueTrue  = "true"
 	tagValueFalse = "false"
-	// Should only be used only for test
-	tagTargetType = "target"
 )
 
 func hasOpenAPITagValue(comments []string, value string) bool {
@@ -77,7 +74,6 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 	if err != nil {
 		glog.Fatalf("Failed loading boilerplate: %v", err)
 	}
-	inputs := sets.NewString(context.Inputs...)
 	header := append([]byte(fmt.Sprintf("// +build !%s\n\n", arguments.GeneratedBuildTag)), boilerplate...)
 	header = append(header, []byte(
 		`
@@ -85,32 +81,20 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 
 `)...)
 
-	targets := []*types.Package{}
-	for i := range inputs {
-		glog.V(5).Infof("considering pkg %q", i)
-		pkg, ok := context.Universe[i]
-		if !ok {
-			// If the input had no Go files, for example.
-			continue
-		}
-		if hasOpenAPITagValue(pkg.Comments, tagTargetType) || hasOpenAPITagValue(pkg.DocComments, tagTargetType) {
-			glog.V(5).Infof("target package : %q", pkg)
-			targets = append(targets, pkg)
-		}
+	if err := context.AddDir(arguments.OutputPackagePath); err != nil {
+		glog.Fatalf("Failed to load output package: %v", err)
 	}
-	switch len(targets) {
-	case 0:
-		// If no target package found, that means the generated file in target package is up to date
-		// and build excluded the target package.
-		return generator.Packages{}
-	case 1:
-		pkg := targets[0]
-		return generator.Packages{&generator.DefaultPackage{
+	pkg := context.Universe[arguments.OutputPackagePath]
+	if pkg == nil {
+		glog.Fatalf("Got nil output package: %v", err)
+	}
+	return generator.Packages{
+		&generator.DefaultPackage{
 			PackageName: strings.Split(filepath.Base(pkg.Path), ".")[0],
 			PackagePath: pkg.Path,
 			HeaderText:  header,
 			GeneratorFunc: func(c *generator.Context) (generators []generator.Generator) {
-				return []generator.Generator{NewOpenAPIGen(arguments.OutputFileBaseName, targets[0], context)}
+				return []generator.Generator{NewOpenAPIGen(arguments.OutputFileBaseName, pkg, context)}
 			},
 			FilterFunc: func(c *generator.Context, t *types.Type) bool {
 				// There is a conflict between this codegen and codecgen, we should avoid types generated for codecgen
@@ -127,9 +111,6 @@ func Packages(context *generator.Context, arguments *args.GeneratorArgs) generat
 				return false
 			},
 		},
-		}
-	default:
-		glog.Fatalf("Duplicate target type found: %v", targets)
 	}
 	return generator.Packages{}
 }

pkg/generated/openapi/doc.go

@@ -15,5 +15,4 @@ limitations under the License.
 */
 
 // openapi generated definitions.
-// +k8s:openapi-gen=target
 package openapi