Add support for compat config in APEX.

apex module accepts PlatformCompatConfigIntf as prebuilt,
and places it in the etc folder of the apex.

Test: m
Test: flash device with dummy config in mediaprovider APEX -
the config is present
Change-Id: Ifc62cd262f6c6571c1bf6c2943879aa20877ecad

apex/apex.go

@@ -1194,6 +1194,12 @@ func apexFileForPrebuiltEtc(ctx android.BaseModuleContext, prebuilt android.Preb
 	return newApexFile(ctx, fileToCopy, depName, dirInApex, etc, prebuilt)
 }
 
+func apexFileForCompatConfig(ctx android.BaseModuleContext, config java.PlatformCompatConfigIntf, depName string) apexFile {
+	dirInApex := filepath.Join("etc", config.SubDir())
+	fileToCopy := config.CompatConfig()
+	return newApexFile(ctx, fileToCopy, depName, dirInApex, etc, config)
+}
+
 func apexFileForAndroidApp(ctx android.BaseModuleContext, aapp interface {
 	android.Module
 	Privileged() bool
@@ -1361,8 +1367,10 @@ func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 			case prebuiltTag:
 				if prebuilt, ok := child.(android.PrebuiltEtcModule); ok {
 					filesInfo = append(filesInfo, apexFileForPrebuiltEtc(ctx, prebuilt, depName))
+				} else if prebuilt, ok := child.(java.PlatformCompatConfigIntf); ok {
+					filesInfo = append(filesInfo, apexFileForCompatConfig(ctx, prebuilt, depName))
 				} else {
-					ctx.PropertyErrorf("prebuilts", "%q is not a prebuilt_etc module", depName)
+					ctx.PropertyErrorf("prebuilts", "%q is not a prebuilt_etc and not a platform_compat_config module", depName)
 				}
 			case testTag:
 				if ccTest, ok := child.(*cc.Module); ok {

apex/apex_test.go

@@ -299,6 +299,7 @@ func testApexContext(t *testing.T, bp string, handlers ...testCustomizer) (*andr
 	ctx.RegisterModuleType("vndk_prebuilt_shared", cc.VndkPrebuiltSharedFactory)
 	ctx.RegisterModuleType("vndk_libraries_txt", cc.VndkLibrariesTxtFactory)
 	ctx.RegisterModuleType("prebuilt_etc", android.PrebuiltEtcFactory)
+	ctx.RegisterModuleType("platform_compat_config", java.PlatformCompatConfigFactory)
 	ctx.RegisterModuleType("sh_binary", android.ShBinaryFactory)
 	ctx.RegisterModuleType("filegroup", android.FileGroupFactory)
 	java.RegisterJavaBuildComponents(ctx)
@@ -3451,6 +3452,41 @@ func TestJavaSDKLibrary(t *testing.T) {
 	ensureContains(t, xml.Args["content"], `<library name="foo" file="/apex/myapex/javalib/foo.jar"`)
 }
 
+func TestCompatConfig(t *testing.T) {
+	ctx, _ := testApex(t, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			prebuilts: ["myjar-platform-compat-config"],
+			java_libs: ["myjar"],
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+
+		platform_compat_config {
+		    name: "myjar-platform-compat-config",
+		    src: ":myjar",
+		}
+
+		java_library {
+			name: "myjar",
+			srcs: ["foo/bar/MyClass.java"],
+			sdk_version: "none",
+			system_modules: "none",
+			compile_dex: true,
+			apex_available: [ "myapex" ],
+		}
+	`)
+	ensureExactContents(t, ctx, "myapex", "android_common_myapex_image", []string{
+		"etc/compatconfig/myjar-platform-compat-config.xml",
+		"javalib/myjar.jar",
+	})
+}
+
 func TestRejectNonInstallableJavaLibrary(t *testing.T) {
 	testApexError(t, `"myjar" is not configured to be compiled into dex`, `
 		apex {

java/platform_compat_config.go

@@ -21,7 +21,7 @@ import (
 
 func init() {
 	android.RegisterSingletonType("platform_compat_config_singleton", platformCompatConfigSingletonFactory)
-	android.RegisterModuleType("platform_compat_config", platformCompatConfigFactory)
+	android.RegisterModuleType("platform_compat_config", PlatformCompatConfigFactory)
 	android.RegisterModuleType("global_compat_config", globalCompatConfigFactory)
 }
 
@@ -50,11 +50,24 @@ func (p *platformCompatConfig) compatConfigMetadata() android.OutputPath {
 	return p.metadataFile
 }
 
-type platformCompatConfigIntf interface {
-	compatConfigMetadata() android.OutputPath
+func (p *platformCompatConfig) CompatConfig() android.OutputPath {
+	return p.configFile
 }
 
-var _ platformCompatConfigIntf = (*platformCompatConfig)(nil)
+func (p *platformCompatConfig) SubDir() string {
+	return "compatconfig"
+}
+
+type PlatformCompatConfigIntf interface {
+	android.Module
+
+	compatConfigMetadata() android.OutputPath
+	CompatConfig() android.OutputPath
+	// Sub dir under etc dir.
+	SubDir() string
+}
+
+var _ PlatformCompatConfigIntf = (*platformCompatConfig)(nil)
 
 // compat singleton rules
 func (p *platformCompatConfigSingleton) GenerateBuildActions(ctx android.SingletonContext) {
@@ -62,7 +75,7 @@ func (p *platformCompatConfigSingleton) GenerateBuildActions(ctx android.Singlet
 	var compatConfigMetadata android.Paths
 
 	ctx.VisitAllModules(func(module android.Module) {
-		if c, ok := module.(platformCompatConfigIntf); ok {
+		if c, ok := module.(PlatformCompatConfigIntf); ok {
 			metadata := c.compatConfigMetadata()
 			compatConfigMetadata = append(compatConfigMetadata, metadata)
 		}
@@ -130,7 +143,7 @@ func platformCompatConfigSingletonFactory() android.Singleton {
 	return &platformCompatConfigSingleton{}
 }
 
-func platformCompatConfigFactory() android.Module {
+func PlatformCompatConfigFactory() android.Module {
 	module := &platformCompatConfig{}
 	module.AddProperties(&module.properties)
 	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibFirst)