Fix protobuf generation

staging/src/k8s.io/code-generator/cmd/go-to-protobuf/protobuf/cmd.go

@@ -260,6 +260,7 @@ func Run(g *Generator) {
 	if len(g.Conditional) > 0 {
 		fmt.Fprintf(buf, "// +build %s\n\n", g.Conditional)
 	}
+	buf.Write(boilerplate)
 
 	for _, outputPackage := range outputPackages {
 		p := outputPackage.(*protobufPackage)

staging/src/k8s.io/code-generator/cmd/go-to-protobuf/protoc-gen-gogo/main.go

@@ -19,6 +19,8 @@ limitations under the License.
 package main
 
 import (
+	"strings"
+
 	"github.com/gogo/protobuf/vanity/command"
 
 	// dependencies that are required for our packages
@@ -28,5 +30,18 @@ import (
 )
 
 func main() {
-	command.Write(command.Generate(command.Read()))
+	// read input
+	request := command.Read()
+
+	// if we're given paths as inputs, generate .pb.go files based on those paths
+	for _, file := range request.FileToGenerate {
+		if strings.Contains(file, "/") {
+			param := "paths=source_relative"
+			request.Parameter = &param
+			break
+		}
+	}
+
+	// generate
+	command.Write(command.Generate(request))
 }