Soong: libbpf_prog: Add defaults support

Add defaults support for libbpf_prog module type.

Test: TH / manual
Bug: 359646531
Change-Id: Idc2977d3cf6efe62968e0eac9fc592d0cf0b3beb
Signed-off-by: Neill Kapron <nkapron@google.com>

bpf/libbpf/libbpf_prog.go

@@ -61,6 +61,7 @@ var (
 )
 
 func registerLibbpfProgBuildComponents(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("libbpf_defaults", defaultsFactory)
 	ctx.RegisterModuleType("libbpf_prog", LibbpfProgFactory)
 }
 
@@ -94,8 +95,9 @@ type LibbpfProgProperties struct {
 
 type libbpfProg struct {
 	android.ModuleBase
+	android.DefaultableModuleBase
 	properties LibbpfProgProperties
-	objs android.Paths
+	objs       android.Paths
 }
 
 var _ android.ImageInterface = (*libbpfProg)(nil)
@@ -269,10 +271,32 @@ func (libbpf *libbpfProg) AndroidMk() android.AndroidMkData {
 	}
 }
 
+type Defaults struct {
+	android.ModuleBase
+	android.DefaultsModuleBase
+}
+
+func defaultsFactory() android.Module {
+	return DefaultsFactory()
+}
+
+func DefaultsFactory(props ...interface{}) android.Module {
+	module := &Defaults{}
+
+	module.AddProperties(props...)
+	module.AddProperties(&LibbpfProgProperties{})
+
+	android.InitDefaultsModule(module)
+
+	return module
+}
+
 func LibbpfProgFactory() android.Module {
 	module := &libbpfProg{}
 
 	module.AddProperties(&module.properties)
 	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)
+	android.InitDefaultableModule(module)
+
 	return module
 }