Generate combined deps-info for all updatable modules.

Introduce a singleton apex rule to merge contents of individual
deps-info results into a single output file.

Bug: 149622332
Test: m
Change-Id: I4ab7e1a3527fead97a81a5a2cb0e1e93a429117c
Merged-In: I4ab7e1a3527fead97a81a5a2cb0e1e93a429117c
Exempt-From-Owner-Approval: cp from aosp
(cherry picked from commit 849f844252872e260a35cf958cb25ab4c5ea3e7f)
diff --git a/Android.bp b/Android.bp
index a81676f..d7c7dae 100644
--- a/Android.bp
+++ b/Android.bp
@@ -489,6 +489,7 @@
     srcs: [
         "apex/androidmk.go",
         "apex/apex.go",
+        "apex/apex_singleton.go",
         "apex/builder.go",
         "apex/key.go",
         "apex/prebuilt.go",
diff --git a/android/apex.go b/android/apex.go
index 75be150..30152db 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -425,7 +425,8 @@
 	fullListPath OutputPath
 }
 
-type ApexDepsInfoIntf interface {
+type ApexBundleDepsInfoIntf interface {
+	Updatable() bool
 	FlatListPath() Path
 	FullListPath() Path
 }
@@ -438,8 +439,6 @@
 	return d.fullListPath
 }
 
-var _ ApexDepsInfoIntf = (*ApexBundleDepsInfo)(nil)
-
 // Generate two module out files:
 // 1. FullList with transitive deps and their parents in the dep graph
 // 2. FlatList with a flat list of transitive deps
diff --git a/apex/apex.go b/apex/apex.go
index e6b7695..fe231f6 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -756,7 +756,7 @@
 		apexBundles = []android.ApexInfo{{
 			ApexName:      mctx.ModuleName(),
 			MinSdkVersion: a.minSdkVersion(mctx),
-			Updatable:     proptools.Bool(a.properties.Updatable),
+			Updatable:     a.Updatable(),
 		}}
 		directDep = true
 	} else if am, ok := mctx.Module().(android.ApexModule); ok {
@@ -1800,6 +1800,12 @@
 	return tagString
 }
 
+func (a *apexBundle) Updatable() bool {
+	return proptools.Bool(a.properties.Updatable)
+}
+
+var _ android.ApexBundleDepsInfoIntf = (*apexBundle)(nil)
+
 // Ensures that the dependencies are marked as available for this APEX
 func (a *apexBundle) checkApexAvailability(ctx android.ModuleContext) {
 	// Let's be practical. Availability for test, host, and the VNDK apex isn't important
@@ -1848,7 +1854,7 @@
 }
 
 func (a *apexBundle) checkUpdatable(ctx android.ModuleContext) {
-	if proptools.Bool(a.properties.Updatable) {
+	if a.Updatable() {
 		if String(a.properties.Min_sdk_version) == "" {
 			ctx.PropertyErrorf("updatable", "updatable APEXes should set min_sdk_version as well")
 		}
@@ -2175,7 +2181,7 @@
 
 	// We don't need the optimization for updatable APEXes, as it might give false signal
 	// to the system health when the APEXes are still bundled (b/149805758)
-	if proptools.Bool(a.properties.Updatable) && a.properties.ApexType == imageApex {
+	if a.Updatable() && a.properties.ApexType == imageApex {
 		a.linkToSystemLib = false
 	}
 
diff --git a/apex/apex_singleton.go b/apex/apex_singleton.go
new file mode 100644
index 0000000..83a56a2
--- /dev/null
+++ b/apex/apex_singleton.go
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package apex
+
+import (
+	"github.com/google/blueprint"
+
+	"android/soong/android"
+)
+
+func init() {
+	android.RegisterSingletonType("apex_depsinfo_singleton", apexDepsInfoSingletonFactory)
+}
+
+type apexDepsInfoSingleton struct {
+	// Output file with all flatlists from updatable modules' deps-info combined
+	updatableFlatListsPath android.OutputPath
+}
+
+func apexDepsInfoSingletonFactory() android.Singleton {
+	return &apexDepsInfoSingleton{}
+}
+
+var combineFilesRule = pctx.AndroidStaticRule("combineFilesRule",
+	blueprint.RuleParams{
+		Command:        "cat $out.rsp | xargs cat > $out",
+		Rspfile:        "$out.rsp",
+		RspfileContent: "$in",
+	},
+)
+
+func (s *apexDepsInfoSingleton) GenerateBuildActions(ctx android.SingletonContext) {
+	updatableFlatLists := android.Paths{}
+	ctx.VisitAllModules(func(module android.Module) {
+		if binaryInfo, ok := module.(android.ApexBundleDepsInfoIntf); ok {
+			if path := binaryInfo.FlatListPath(); path != nil {
+				if binaryInfo.Updatable() {
+					updatableFlatLists = append(updatableFlatLists, path)
+				}
+			}
+		}
+	})
+
+	s.updatableFlatListsPath = android.PathForOutput(ctx, "apex", "depsinfo", "updatable-flatlists.txt")
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        combineFilesRule,
+		Description: "Generate " + s.updatableFlatListsPath.String(),
+		Inputs:      updatableFlatLists,
+		Output:      s.updatableFlatListsPath,
+	})
+}
diff --git a/java/app.go b/java/app.go
index 86cf747..11dc6ac 100755
--- a/java/app.go
+++ b/java/app.go
@@ -414,7 +414,7 @@
 }
 
 func (a *AndroidApp) checkAppSdkVersions(ctx android.ModuleContext) {
-	if Bool(a.appProperties.Updatable) {
+	if a.Updatable() {
 		if !a.sdkVersion().stable() {
 			ctx.PropertyErrorf("sdk_version", "Updatable apps must use stable SDKs, found %v", a.sdkVersion())
 		}
@@ -879,6 +879,10 @@
 	a.ApexBundleDepsInfo.BuildDepsInfoLists(ctx, a.MinSdkVersion(), depsInfo)
 }
 
+func (a *AndroidApp) Updatable() bool {
+	return Bool(a.appProperties.Updatable) || a.ApexModuleBase.Updatable()
+}
+
 func (a *AndroidApp) getCertString(ctx android.BaseModuleContext) string {
 	certificate, overridden := ctx.DeviceConfig().OverrideCertificateFor(ctx.ModuleName())
 	if overridden {