Add prebuilt_apex.

Bug: 127789981
Test: apex_test.go + com.android.tzdata.apex
Change-Id: I09bb0a4b2acf310c55c789569da3c9d755638232

3 files changed, 118 insertions, 1 deletions

diff --git a/apex/apex.go b/apex/apex.go
index c1f52a60..685a7746 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -149,6 +149,7 @@ func init() {
 	android.RegisterModuleType("apex", apexBundleFactory)
 	android.RegisterModuleType("apex_test", testApexBundleFactory)
 	android.RegisterModuleType("apex_defaults", defaultsFactory)
+	android.RegisterModuleType("prebuilt_apex", PrebuiltFactory)
 
 	android.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.TopDown("apex_deps", apexDepsMutator)
@@ -1283,3 +1284,71 @@ func DefaultsFactory(props ...interface{}) android.Module {
 	android.InitDefaultsModule(module)
 	return module
 }
+
+//
+// Prebuilt APEX
+//
+type Prebuilt struct {
+	android.ModuleBase
+	prebuilt android.Prebuilt
+
+	properties PrebuiltProperties
+
+	inputApex  android.Path
+	installDir android.OutputPath
+}
+
+type PrebuiltProperties struct {
+	// the path to the prebuilt .apex file to import.
+	Src string `android:"arch_variant"`
+
+	// the name of the apex_key module that contains the matching public key to be installed.
+	Key *string
+}
+
+func (p *Prebuilt) DepsMutator(ctx android.BottomUpMutatorContext) {
+	if String(p.properties.Key) == "" {
+		ctx.ModuleErrorf("key is missing")
+		return
+	}
+	ctx.AddDependency(ctx.Module(), keyTag, *p.properties.Key)
+}
+
+func (p *Prebuilt) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+	// TODO(jungjw): Check the key validity.
+	p.inputApex = p.prebuilt.SingleSourcePath(ctx)
+	p.installDir = android.PathForModuleInstall(ctx, "apex")
+	ctx.InstallFile(p.installDir, ctx.ModuleName()+imageApexSuffix, p.inputApex)
+}
+
+func (p *Prebuilt) Prebuilt() *android.Prebuilt {
+	return &p.prebuilt
+}
+
+func (p *Prebuilt) Name() string {
+	return p.prebuilt.Name(p.ModuleBase.Name())
+}
+
+func (p *Prebuilt) AndroidMk() android.AndroidMkData {
+	return android.AndroidMkData{
+		Class:      "ETC",
+		OutputFile: android.OptionalPathForPath(p.inputApex),
+		Include:    "$(BUILD_PREBUILT)",
+		Extra: []android.AndroidMkExtraFunc{
+			func(w io.Writer, outputFile android.Path) {
+				fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", filepath.Join("$(OUT_DIR)", p.installDir.RelPathString()))
+				fmt.Fprintln(w, "LOCAL_MODULE_STEM :=", p.BaseModuleName()+imageApexSuffix)
+				fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES :=", String(p.properties.Key))
+			},
+		},
+	}
+}
+
+// prebuilt_apex imports an `.apex` file into the build graph as if it was built with apex.
+func PrebuiltFactory() android.Module {
+	module := &Prebuilt{}
+	module.AddProperties(&module.properties)
+	android.InitSingleSourcePrebuiltModule(module, &module.properties.Src)
+	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibCommon)
+	return module
+}
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 8a2e55af..2d9cca6f 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -15,6 +15,8 @@
 package apex
 
 import (
+	"bufio"
+	"bytes"
 	"io/ioutil"
 	"os"
 	"strings"
@@ -36,11 +38,14 @@ func testApex(t *testing.T, bp string) *android.TestContext {
 	ctx.RegisterModuleType("apex_test", android.ModuleFactoryAdaptor(testApexBundleFactory))
 	ctx.RegisterModuleType("apex_key", android.ModuleFactoryAdaptor(apexKeyFactory))
 	ctx.RegisterModuleType("apex_defaults", android.ModuleFactoryAdaptor(defaultsFactory))
+	ctx.RegisterModuleType("prebuilt_apex", android.ModuleFactoryAdaptor(PrebuiltFactory))
 	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
 
 	ctx.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.TopDown("apex_deps", apexDepsMutator)
 		ctx.BottomUp("apex", apexMutator)
+		ctx.TopDown("prebuilt_select", android.PrebuiltSelectModuleMutator).Parallel()
+		ctx.BottomUp("prebuilt_postdeps", android.PrebuiltPostDepsMutator).Parallel()
 	})
 
 	ctx.RegisterModuleType("cc_library", android.ModuleFactoryAdaptor(cc.LibraryFactory))
@@ -54,6 +59,9 @@ func testApex(t *testing.T, bp string) *android.TestContext {
 	ctx.RegisterModuleType("sh_binary", android.ModuleFactoryAdaptor(android.ShBinaryFactory))
 	ctx.RegisterModuleType("android_app_certificate", android.ModuleFactoryAdaptor(java.AndroidAppCertificateFactory))
 	ctx.RegisterModuleType("filegroup", android.ModuleFactoryAdaptor(android.FileGroupFactory))
+	ctx.PreArchMutators(func(ctx android.RegisterMutatorsContext) {
+		ctx.BottomUp("prebuilts", android.PrebuiltMutator).Parallel()
+	})
 	ctx.PreDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.BottomUp("image", cc.ImageMutator).Parallel()
 		ctx.BottomUp("link", cc.LinkageMutator).Parallel()
@@ -163,6 +171,7 @@ func testApex(t *testing.T, bp string) *android.TestContext {
 		"custom_notice":                        nil,
 		"testkey2.avbpubkey":                   nil,
 		"testkey2.pem":                         nil,
+		"myapex.apex":                          nil,
 	})
 	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
 	android.FailIfErrored(t, errs)
@@ -1229,3 +1238,42 @@ func TestApexKeyFromOtherModule(t *testing.T) {
 		t.Errorf("wrong private key path. expected %q. actual %q", expected_privkey, actual_privkey)
 	}
 }
+
+func TestPrebuilt(t *testing.T) {
+	ctx := testApex(t, `
+		prebuilt_apex {
+			name: "myapex",
+			src: "myapex.apex",
+			key: "myapex.key"
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+			product_specific: true,
+		}
+	`)
+
+	prebuilt := ctx.ModuleForTests("myapex", "android_common").Module().(*Prebuilt)
+
+	// Check if the key module is added as a required module.
+	buf := &bytes.Buffer{}
+	prebuilt.AndroidMk().Extra[0](buf, nil)
+	found := false
+	scanner := bufio.NewScanner(bytes.NewReader(buf.Bytes()))
+	expected := "myapex.key"
+	for scanner.Scan() {
+		line := scanner.Text()
+		tok := strings.Split(line, " := ")
+		if tok[0] == "LOCAL_REQUIRED_MODULES" {
+			found = true
+			if tok[1] != "myapex.key" {
+				t.Errorf("Unexpected LOCAL_REQUIRED_MODULES '%s', expected '%s'", tok[1], expected)
+			}
+		}
+	}
+	if !found {
+		t.Errorf("Couldn't find a LOCAL_REQUIRED_MODULES entry")
+	}
+}
diff --git a/apex/key.go b/apex/key.go
index 848e8ceb..fbd29bce 100644
--- a/apex/key.go
+++ b/apex/key.go
@@ -93,7 +93,7 @@ func (m *apexKey) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	pubKeyName := m.public_key_file.Base()[0 : len(m.public_key_file.Base())-len(m.public_key_file.Ext())]
 	privKeyName := m.private_key_file.Base()[0 : len(m.private_key_file.Base())-len(m.private_key_file.Ext())]
 
-	if pubKeyName != privKeyName {
+	if m.properties.Public_key != nil && m.properties.Private_key != nil && pubKeyName != privKeyName {
 		ctx.ModuleErrorf("public_key %q (keyname:%q) and private_key %q (keyname:%q) do not have same keyname",
 			m.public_key_file.String(), pubKeyName, m.private_key_file, privKeyName)
 		return