Merge "Support fully qualified names in `android:"path"` properties"
diff --git a/android/config.go b/android/config.go
index ed90c31..396b1a6 100644
--- a/android/config.go
+++ b/android/config.go
@@ -821,6 +821,12 @@
 	return Bool(c.productVariables.Unbundled_build_apps)
 }
 
+// Returns true if building image that aren't bundled with the platform.
+// UnbundledBuild() is always true when this is true.
+func (c *config) UnbundledBuildImage() bool {
+	return Bool(c.productVariables.Unbundled_build_image)
+}
+
 // Returns true if building modules against prebuilt SDKs.
 func (c *config) AlwaysUsePrebuiltSdks() bool {
 	return Bool(c.productVariables.Always_use_prebuilt_sdks)
diff --git a/android/module.go b/android/module.go
index 385b63a..11f63bd 100644
--- a/android/module.go
+++ b/android/module.go
@@ -2829,9 +2829,10 @@
 	return module
 }
 
-// SrcIsModule decodes module references in the format ":unqualified-name{.tag}" or
-// "//namespace:name{.tag}" into the module name and an empty string for the tag, or empty strings
-// if the input was not a module reference.
+// SrcIsModuleWithTag decodes module references in the format ":unqualified-name{.tag}" or
+// "//namespace:name{.tag}" into the module name and tag, ":unqualified-name" or "//namespace:name"
+// into the module name and an empty string for the tag, or empty strings if the input was not a
+// module reference.
 func SrcIsModuleWithTag(s string) (module, tag string) {
 	if len(s) > 1 {
 		if s[0] == ':' {
diff --git a/android/variable.go b/android/variable.go
index b6e168c..bbb9868 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -225,6 +225,7 @@
 	Allow_missing_dependencies   *bool `json:",omitempty"`
 	Unbundled_build              *bool `json:",omitempty"`
 	Unbundled_build_apps         *bool `json:",omitempty"`
+	Unbundled_build_image        *bool `json:",omitempty"`
 	Always_use_prebuilt_sdks     *bool `json:",omitempty"`
 	Skip_boot_jars_check         *bool `json:",omitempty"`
 	Malloc_not_svelte            *bool `json:",omitempty"`
diff --git a/apex/platform_bootclasspath_test.go b/apex/platform_bootclasspath_test.go
index 279cf54..7209c02 100644
--- a/apex/platform_bootclasspath_test.go
+++ b/apex/platform_bootclasspath_test.go
@@ -398,6 +398,7 @@
 			name: "foo",
 			prefer: false,
 			shared_library: false,
+			permitted_packages: ["foo"],
 			public: {
 				jars: ["sdk_library/public/foo-stubs.jar"],
 				stub_srcs: ["sdk_library/public/foo_stub_sources"],
diff --git a/dexpreopt/class_loader_context.go b/dexpreopt/class_loader_context.go
index b79f2d7..94b9adf 100644
--- a/dexpreopt/class_loader_context.go
+++ b/dexpreopt/class_loader_context.go
@@ -258,6 +258,9 @@
 func (clcMap ClassLoaderContextMap) addContext(ctx android.ModuleInstallPathContext, sdkVer int, lib string,
 	hostPath, installPath android.Path, nestedClcMap ClassLoaderContextMap) error {
 
+	// For prebuilts, library should have the same name as the source module.
+	lib = android.RemoveOptionalPrebuiltPrefix(lib)
+
 	devicePath := UnknownInstallLibraryPath
 	if installPath == nil {
 		if android.InList(lib, CompatUsesLibs) || android.InList(lib, OptionalCompatUsesLibs) {
diff --git a/java/app.go b/java/app.go
index fc1ace0..fc6e183 100755
--- a/java/app.go
+++ b/java/app.go
@@ -1213,7 +1213,7 @@
 }
 
 func (u *usesLibrary) deps(ctx android.BottomUpMutatorContext, hasFrameworkLibs bool) {
-	if !ctx.Config().UnbundledBuild() {
+	if !ctx.Config().UnbundledBuild() || ctx.Config().UnbundledBuildImage() {
 		ctx.AddVariationDependencies(nil, usesLibTag, u.usesLibraryProperties.Uses_libs...)
 		ctx.AddVariationDependencies(nil, usesLibTag, u.presentOptionalUsesLibs(ctx)...)
 		// Only add these extra dependencies if the module depends on framework libs. This avoids
@@ -1249,15 +1249,16 @@
 // to their dex jars on host and on device.
 func (u *usesLibrary) classLoaderContextForUsesLibDeps(ctx android.ModuleContext) dexpreopt.ClassLoaderContextMap {
 	clcMap := make(dexpreopt.ClassLoaderContextMap)
-
-	if !ctx.Config().UnbundledBuild() {
+	// Skip when UnbundledBuild() is true, but UnbundledBuildImage() is false.
+	// Added UnbundledBuildImage() condition to generate dexpreopt.config even though unbundled image is built.
+	if !ctx.Config().UnbundledBuild() || ctx.Config().UnbundledBuildImage() {
 		ctx.VisitDirectDeps(func(m android.Module) {
 			if tag, ok := ctx.OtherModuleDependencyTag(m).(usesLibraryDependencyTag); ok {
 				dep := ctx.OtherModuleName(m)
 				if lib, ok := m.(UsesLibraryDependency); ok {
-					libName := dep
+					libName := android.RemoveOptionalPrebuiltPrefix(dep)
 					if ulib, ok := m.(ProvidesUsesLib); ok && ulib.ProvidesUsesLib() != nil {
-						libName = *ulib.ProvidesUsesLib()
+						libName = android.RemoveOptionalPrebuiltPrefix(*ulib.ProvidesUsesLib())
 						// Replace module name with library name in `uses_libs`/`optional_uses_libs`
 						// in order to pass verify_uses_libraries check (which compares these
 						// properties against library names written in the manifest).
diff --git a/java/dexpreopt.go b/java/dexpreopt.go
index 2e46d74..0faae36 100644
--- a/java/dexpreopt.go
+++ b/java/dexpreopt.go
@@ -141,10 +141,9 @@
 		}
 	}
 
-	// If it is neither app nor test, make config files regardless of its dexpreopt setting.
+	// If it is test, make config files regardless of its dexpreopt setting.
 	// The config files are required for apps defined in make which depend on the lib.
-	// TODO(b/158843648): The config for apps should be generated as well regardless of setting.
-	if (d.isApp || d.isTest) && d.dexpreoptDisabled(ctx) {
+	if d.isTest && d.dexpreoptDisabled(ctx) {
 		return
 	}
 
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 19c65ca..0ba56ca 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -159,7 +159,9 @@
 // library is a part of a non-updatable APEX).
 //
 // A related variable PRODUCT_UPDATABLE_BOOT_JARS contains bootclasspath libraries that are in
-// updatable APEXes. They are not included in the boot image.
+// APEXes. They are not included in the boot image. The only exception here is core-icu4j.jar that
+// has been historically part of the boot image and is now in a non updatable apex; it is treated
+// as being part of PRODUCT_BOOT_JARS and is in the boot image.
 //
 // One exception to the above rules are "coverage" builds (a special build flavor which requires
 // setting environment variable EMMA_INSTRUMENT_FRAMEWORK=true). In coverage builds the Java code in
diff --git a/java/java.go b/java/java.go
index d763a4b..bd059b5 100644
--- a/java/java.go
+++ b/java/java.go
@@ -21,7 +21,6 @@
 import (
 	"fmt"
 	"path/filepath"
-	"strings"
 
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
@@ -581,6 +580,10 @@
 
 	JarToExport     android.Path `android:"arch_variant"`
 	AidlIncludeDirs android.Paths
+
+	// The list of permitted packages that need to be passed to the prebuilts as they are used to
+	// create the updatable-bcp-packages.txt file.
+	PermittedPackages []string
 }
 
 func (p *librarySdkMemberProperties) PopulateFromVariant(ctx android.SdkMemberContext, variant android.Module) {
@@ -589,6 +592,8 @@
 	p.JarToExport = ctx.MemberType().(*librarySdkMemberType).jarToExportGetter(ctx, j)
 
 	p.AidlIncludeDirs = j.AidlIncludeDirs()
+
+	p.PermittedPackages = j.PermittedPackagesForUpdatableBootJars()
 }
 
 func (p *librarySdkMemberProperties) AddToPropertySet(ctx android.SdkMemberContext, propertySet android.BpPropertySet) {
@@ -607,6 +612,10 @@
 		propertySet.AddProperty("jars", []string{snapshotRelativeJavaLibPath})
 	}
 
+	if len(p.PermittedPackages) > 0 {
+		propertySet.AddProperty("permitted_packages", p.PermittedPackages)
+	}
+
 	// Do not copy anything else to the snapshot.
 	if memberType.onlyCopyJarToSnapshot {
 		return
@@ -1127,6 +1136,10 @@
 
 	Installable *bool
 
+	// If not empty, classes are restricted to the specified packages and their sub-packages.
+	// This information is used to generate the updatable-bcp-packages.txt file.
+	Permitted_packages []string
+
 	// List of shared java libs that this module has dependencies to
 	Libs []string
 
@@ -1179,6 +1192,12 @@
 	minSdkVersion android.SdkSpec
 }
 
+var _ PermittedPackagesForUpdatableBootJars = (*Import)(nil)
+
+func (j *Import) PermittedPackagesForUpdatableBootJars() []string {
+	return j.properties.Permitted_packages
+}
+
 func (j *Import) SdkVersion(ctx android.EarlyModuleContext) android.SdkSpec {
 	return android.SdkSpecFrom(ctx, String(j.properties.Sdk_version))
 }
@@ -1465,11 +1484,7 @@
 	// TODO(b/113562217): Extract the base module name from the Import name, often the Import name
 	// has a prefix "prebuilt_". Remove the prefix explicitly if needed until we find a better
 	// solution to get the Import name.
-	name := j.Name()
-	if strings.HasPrefix(name, removedPrefix) {
-		name = strings.TrimPrefix(name, removedPrefix)
-	}
-	return name
+	return android.RemoveOptionalPrebuiltPrefix(j.Name())
 }
 
 var _ android.PrebuiltInterface = (*Import)(nil)
diff --git a/java/robolectric.go b/java/robolectric.go
index 00f233e..a37a118 100644
--- a/java/robolectric.go
+++ b/java/robolectric.go
@@ -179,7 +179,7 @@
 			continue
 		} else if strings.HasSuffix(s, "/BaseRobolectricTest.java") {
 			continue
-		} else if strings.HasPrefix(s, "src/") {
+		} else {
 			s = strings.TrimPrefix(s, "src/")
 		}
 		r.tests = append(r.tests, s)
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 2b71857..d1b4a47 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -1897,6 +1897,10 @@
 
 	// If set to true, compile dex files for the stubs. Defaults to false.
 	Compile_dex *bool
+
+	// If not empty, classes are restricted to the specified packages and their sub-packages.
+	// This information is used to generate the updatable-bcp-packages.txt file.
+	Permitted_packages []string
 }
 
 type SdkLibraryImport struct {
@@ -1995,6 +1999,12 @@
 	return module
 }
 
+var _ PermittedPackagesForUpdatableBootJars = (*SdkLibraryImport)(nil)
+
+func (module *SdkLibraryImport) PermittedPackagesForUpdatableBootJars() []string {
+	return module.properties.Permitted_packages
+}
+
 func (module *SdkLibraryImport) Prebuilt() *android.Prebuilt {
 	return &module.prebuilt
 }
@@ -2510,6 +2520,8 @@
 
 	// The paths to the doctag files to add to the prebuilt.
 	Doctag_paths android.Paths
+
+	Permitted_packages []string
 }
 
 type scopeProperties struct {
@@ -2550,6 +2562,7 @@
 	s.Shared_library = proptools.BoolPtr(sdk.sharedLibrary())
 	s.Compile_dex = sdk.dexProperties.Compile_dex
 	s.Doctag_paths = sdk.doctagPaths
+	s.Permitted_packages = sdk.PermittedPackagesForUpdatableBootJars()
 }
 
 func (s *sdkLibrarySdkMemberProperties) AddToPropertySet(ctx android.SdkMemberContext, propertySet android.BpPropertySet) {
@@ -2562,6 +2575,9 @@
 	if s.Compile_dex != nil {
 		propertySet.AddProperty("compile_dex", *s.Compile_dex)
 	}
+	if len(s.Permitted_packages) > 0 {
+		propertySet.AddProperty("permitted_packages", s.Permitted_packages)
+	}
 
 	for _, apiScope := range allApiScopes {
 		if properties, ok := s.Scopes[apiScope]; ok {
diff --git a/sdk/bootclasspath_fragment_sdk_test.go b/sdk/bootclasspath_fragment_sdk_test.go
index a458cba..1d2ab42 100644
--- a/sdk/bootclasspath_fragment_sdk_test.go
+++ b/sdk/bootclasspath_fragment_sdk_test.go
@@ -327,6 +327,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["myapex"],
     jars: ["java/mybootlib.jar"],
+    permitted_packages: ["mybootlib"],
 }
 
 java_sdk_library_import {
@@ -336,6 +337,7 @@
     apex_available: ["myapex"],
     shared_library: true,
     compile_dex: true,
+    permitted_packages: ["myothersdklibrary"],
     public: {
         jars: ["sdk_library/public/myothersdklibrary-stubs.jar"],
         stub_srcs: ["sdk_library/public/myothersdklibrary_stub_sources"],
@@ -409,6 +411,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["myapex"],
     jars: ["java/mybootlib.jar"],
+    permitted_packages: ["mybootlib"],
 }
 
 java_sdk_library_import {
@@ -418,6 +421,7 @@
     apex_available: ["myapex"],
     shared_library: true,
     compile_dex: true,
+    permitted_packages: ["myothersdklibrary"],
     public: {
         jars: ["sdk_library/public/myothersdklibrary-stubs.jar"],
         stub_srcs: ["sdk_library/public/myothersdklibrary_stub_sources"],
@@ -509,6 +513,12 @@
 				out/soong/.intermediates/frameworks/base/boot/platform-bootclasspath/android_common/hiddenapi-monolithic/index-from-classes.csv
         snapshot/hiddenapi/index.csv
 			`, rule)
+
+			// Make sure that the permitted packages from the prebuilts end up in the
+			// updatable-bcp-packages.txt file.
+			rule = module.Output("updatable-bcp-packages.txt")
+			expectedContents := `'mybootlib\nmyothersdklibrary\n'`
+			android.AssertStringEquals(t, "updatable-bcp-packages.txt", expectedContents, rule.Args["content"])
 		}),
 		snapshotTestPreparer(checkSnapshotWithSourcePreferred, preparerForSnapshot),
 		snapshotTestPreparer(checkSnapshotPreferredWithSource, preparerForSnapshot),
@@ -779,6 +789,7 @@
 				srcs: ["Test.java"],
 				compile_dex: true,
 				public: {enabled: true},
+				permitted_packages: ["mysdklibrary"],
 			}
 		`),
 	).RunTest(t)
@@ -822,6 +833,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["myapex"],
     jars: ["java/mybootlib.jar"],
+    permitted_packages: ["mybootlib"],
 }
 
 java_sdk_library_import {
@@ -831,6 +843,7 @@
     apex_available: ["//apex_available:platform"],
     shared_library: true,
     compile_dex: true,
+    permitted_packages: ["mysdklibrary"],
     public: {
         jars: ["sdk_library/public/mysdklibrary-stubs.jar"],
         stub_srcs: ["sdk_library/public/mysdklibrary_stub_sources"],
diff --git a/sdk/java_sdk_test.go b/sdk/java_sdk_test.go
index a2cfe6d..813dcfd 100644
--- a/sdk/java_sdk_test.go
+++ b/sdk/java_sdk_test.go
@@ -175,6 +175,7 @@
 			sdk_version: "none",
 			compile_dex: true,
 			host_supported: true,
+			permitted_packages: ["pkg.myjavalib"],
 		}
 	`)
 
@@ -188,6 +189,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 `),
 		checkVersionedAndroidBpContents(`
@@ -199,6 +201,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 
 sdk_snapshot {
@@ -437,6 +440,7 @@
 			system_modules: "none",
 			sdk_version: "none",
 			compile_dex: true,
+			permitted_packages: ["pkg.myjavalib"],
 		}
 	`)
 
@@ -450,6 +454,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 `),
 		checkVersionedAndroidBpContents(`
@@ -461,6 +466,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:platform"],
     jars: ["java/myjavalib.jar"],
+    permitted_packages: ["pkg.myjavalib"],
 }
 
 module_exports_snapshot {
@@ -1045,6 +1051,7 @@
 			shared_library: false,
 			stubs_library_visibility: ["//other"],
 			stubs_source_visibility: ["//another"],
+			permitted_packages: ["pkg.myjavalib"],
 		}
 	`)
 
@@ -1058,6 +1065,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:anyapex"],
     shared_library: false,
+    permitted_packages: ["pkg.myjavalib"],
     public: {
         jars: ["sdk_library/public/myjavalib-stubs.jar"],
         stub_srcs: ["sdk_library/public/myjavalib_stub_sources"],
@@ -1090,6 +1098,7 @@
     visibility: ["//visibility:public"],
     apex_available: ["//apex_available:anyapex"],
     shared_library: false,
+    permitted_packages: ["pkg.myjavalib"],
     public: {
         jars: ["sdk_library/public/myjavalib-stubs.jar"],
         stub_srcs: ["sdk_library/public/myjavalib_stub_sources"],
diff --git a/sdk/sdk_test.go b/sdk/sdk_test.go
index a13b0d7..97fb248 100644
--- a/sdk/sdk_test.go
+++ b/sdk/sdk_test.go
@@ -565,6 +565,49 @@
 		)
 	})
 
+	t.Run("SOONG_SDK_SNAPSHOT_USE_SOURCE_CONFIG_VAR=module:build_from_source", func(t *testing.T) {
+		result := android.GroupFixturePreparers(
+			preparer,
+			android.FixtureMergeEnv(map[string]string{
+				"SOONG_SDK_SNAPSHOT_USE_SOURCE_CONFIG_VAR": "module:build_from_source",
+			}),
+		).RunTest(t)
+
+		checkZipFile(t, result, "out/soong/.intermediates/mysdk/common_os/mysdk-current.zip")
+
+		CheckSnapshot(t, result, "mysdk", "",
+			checkAndroidBpContents(`
+// This is auto-generated. DO NOT EDIT.
+
+java_import {
+    name: "mysdk_myjavalib@current",
+    sdk_member_name: "myjavalib",
+    visibility: ["//visibility:public"],
+    apex_available: ["//apex_available:platform"],
+    jars: ["java/myjavalib.jar"],
+}
+
+java_import {
+    name: "myjavalib",
+    prefer: false,
+    use_source_config_var: {
+        config_namespace: "module",
+        var_name: "build_from_source",
+    },
+    visibility: ["//visibility:public"],
+    apex_available: ["//apex_available:platform"],
+    jars: ["java/myjavalib.jar"],
+}
+
+sdk_snapshot {
+    name: "mysdk@current",
+    visibility: ["//visibility:public"],
+    java_header_libs: ["mysdk_myjavalib@current"],
+}
+			`),
+		)
+	})
+
 	t.Run("SOONG_SDK_SNAPSHOT_VERSION=unversioned", func(t *testing.T) {
 		result := android.GroupFixturePreparers(
 			preparer,
diff --git a/sdk/update.go b/sdk/update.go
index b146b62..6da3756 100644
--- a/sdk/update.go
+++ b/sdk/update.go
@@ -35,6 +35,37 @@
 //     By default every unversioned module in the generated snapshot has prefer: false. Building it
 //     with SOONG_SDK_SNAPSHOT_PREFER=true will force them to use prefer: true.
 //
+// SOONG_SDK_SNAPSHOT_USE_SOURCE_CONFIG_VAR
+//     If set this specifies the Soong config var that can be used to control whether the prebuilt
+//     modules from the generated snapshot or the original source modules. Values must be a colon
+//     separated pair of strings, the first of which is the Soong config namespace, and the second
+//     is the name of the variable within that namespace.
+//
+//     The config namespace and var name are used to set the `use_source_config_var` property. That
+//     in turn will cause the generated prebuilts to use the soong config variable to select whether
+//     source or the prebuilt is used.
+//     e.g. If an sdk snapshot is built using:
+//       m SOONG_SDK_SNAPSHOT_USE_SOURCE_CONFIG_VAR=acme:build_from_source sdkextensions-sdk
+//     Then the resulting snapshot will include:
+//       use_source_config_var: {
+//         config_namespace: "acme",
+//         var_name: "build_from_source",
+//       }
+//
+//     Assuming that the config variable is defined in .mk using something like:
+//       $(call add_soong_config_namespace,acme)
+//       $(call add_soong_config_var_value,acme,build_from_source,true)
+//
+//     Then when the snapshot is unpacked in the repository it will have the following behavior:
+//       m droid - will use the sdkextensions-sdk prebuilts if present. Otherwise, it will use the
+//           sources.
+//       m SOONG_CONFIG_acme_build_from_source=true droid - will use the sdkextensions-sdk
+//            sources, if present. Otherwise, it will use the prebuilts.
+//
+//     This is a temporary mechanism to control the prefer flags and will be removed once a more
+//     maintainable solution has been implemented.
+//     TODO(b/174997203): Remove when no longer necessary.
+//
 // SOONG_SDK_SNAPSHOT_VERSION
 //     This provides control over the version of the generated snapshot.
 //
@@ -760,6 +791,8 @@
 	module.insertAfter("name", "sdk_member_name", name)
 	// Remove the prefer property if present as versioned modules never need marking with prefer.
 	module.removeProperty("prefer")
+	// Ditto for use_source_config_var
+	module.removeProperty("use_source_config_var")
 	return module
 }
 
@@ -1627,13 +1660,24 @@
 		// snapshot to be created that sets prefer: true.
 		// TODO(b/174997203): Remove once the ability to select the modules to prefer can be done
 		//  dynamically at build time not at snapshot generation time.
-		prefer := ctx.sdkMemberContext.Config().IsEnvTrue("SOONG_SDK_SNAPSHOT_PREFER")
+		config := ctx.sdkMemberContext.Config()
+		prefer := config.IsEnvTrue("SOONG_SDK_SNAPSHOT_PREFER")
 
 		// Set prefer. Setting this to false is not strictly required as that is the default but it does
 		// provide a convenient hook to post-process the generated Android.bp file, e.g. in tests to
 		// check the behavior when a prebuilt is preferred. It also makes it explicit what the default
 		// behavior is for the module.
 		bpModule.insertAfter("name", "prefer", prefer)
+
+		configVar := config.Getenv("SOONG_SDK_SNAPSHOT_USE_SOURCE_CONFIG_VAR")
+		if configVar != "" {
+			parts := strings.Split(configVar, ":")
+			cfp := android.ConfigVarProperties{
+				Config_namespace: proptools.StringPtr(parts[0]),
+				Var_name:         proptools.StringPtr(parts[1]),
+			}
+			bpModule.insertAfter("prefer", "use_source_config_var", cfp)
+		}
 	}
 
 	// Group the variants by os type.
diff --git a/ui/build/config.go b/ui/build/config.go
index 7370627..cd6d549 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -345,12 +345,7 @@
 		return
 	}
 
-	b := &smpb.BuildConfig{
-		ForceUseGoma: proto.Bool(config.ForceUseGoma()),
-		UseGoma:      proto.Bool(config.UseGoma()),
-		UseRbe:       proto.Bool(config.UseRBE()),
-	}
-	ctx.Metrics.BuildConfig(b)
+	ctx.Metrics.BuildConfig(buildConfig(config))
 
 	s := &smpb.SystemResourceInfo{
 		TotalPhysicalMemory: proto.Uint64(config.TotalRAM()),
@@ -359,6 +354,16 @@
 	ctx.Metrics.SystemResourceInfo(s)
 }
 
+func buildConfig(config Config) *smpb.BuildConfig {
+	return &smpb.BuildConfig{
+		ForceUseGoma:    proto.Bool(config.ForceUseGoma()),
+		UseGoma:         proto.Bool(config.UseGoma()),
+		UseRbe:          proto.Bool(config.UseRBE()),
+		BazelAsNinja:    proto.Bool(config.UseBazel()),
+		BazelMixedBuild: proto.Bool(config.bazelBuildMode() == mixedBuild),
+	}
+}
+
 // getConfigArgs processes the command arguments based on the build action and creates a set of new
 // arguments to be accepted by Config.
 func getConfigArgs(action BuildAction, dir string, ctx Context, args []string) []string {
diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index 7b14c47..7d4c76b 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -26,7 +26,10 @@
 	"testing"
 
 	"android/soong/ui/logger"
+	smpb "android/soong/ui/metrics/metrics_proto"
 	"android/soong/ui/status"
+
+	"github.com/golang/protobuf/proto"
 )
 
 func testContext() Context {
@@ -995,3 +998,111 @@
 		})
 	}
 }
+
+func TestBuildConfig(t *testing.T) {
+	tests := []struct {
+		name                string
+		environ             Environment
+		useBazel            bool
+		expectedBuildConfig *smpb.BuildConfig
+	}{
+		{
+			name:    "none set",
+			environ: Environment{},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "force use goma",
+			environ: Environment{"FORCE_USE_GOMA=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(true),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "use goma",
+			environ: Environment{"USE_GOMA=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(true),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "use rbe",
+			environ: Environment{"USE_RBE=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(true),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:     "use bazel as ninja",
+			environ:  Environment{},
+			useBazel: true,
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(true),
+				BazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "bazel mixed build",
+			environ: Environment{"USE_BAZEL_ANALYSIS=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(false),
+				UseGoma:         proto.Bool(false),
+				UseRbe:          proto.Bool(false),
+				BazelAsNinja:    proto.Bool(false),
+				BazelMixedBuild: proto.Bool(true),
+			},
+		},
+		{
+			name: "all set",
+			environ: Environment{
+				"FORCE_USE_GOMA=1",
+				"USE_GOMA=1",
+				"USE_RBE=1",
+				"USE_BAZEL_ANALYSIS=1",
+			},
+			useBazel: true,
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:    proto.Bool(true),
+				UseGoma:         proto.Bool(true),
+				UseRbe:          proto.Bool(true),
+				BazelAsNinja:    proto.Bool(true),
+				BazelMixedBuild: proto.Bool(true),
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			c := &configImpl{
+				environ:  &tc.environ,
+				useBazel: tc.useBazel,
+			}
+			config := Config{c}
+			actualBuildConfig := buildConfig(config)
+			if expected := tc.expectedBuildConfig; !proto.Equal(expected, actualBuildConfig) {
+				t.Errorf("Expected build config != actual build config: %#v != %#v", *expected, *actualBuildConfig)
+			}
+		})
+	}
+}
diff --git a/ui/build/dumpvars.go b/ui/build/dumpvars.go
index 83c8865..f3c442e 100644
--- a/ui/build/dumpvars.go
+++ b/ui/build/dumpvars.go
@@ -163,6 +163,7 @@
 	"AUX_OS_VARIANT_LIST",
 	"PRODUCT_SOONG_NAMESPACES",
 	"SOONG_SDK_SNAPSHOT_PREFER",
+	"SOONG_SDK_SNAPSHOT_USE_SOURCE_CONFIG_VAR",
 	"SOONG_SDK_SNAPSHOT_VERSION",
 }
 
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index fc2cfa4..1063337 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -433,9 +433,14 @@
 }
 
 type BuildConfig struct {
-	UseGoma              *bool    `protobuf:"varint,1,opt,name=use_goma,json=useGoma" json:"use_goma,omitempty"`
-	UseRbe               *bool    `protobuf:"varint,2,opt,name=use_rbe,json=useRbe" json:"use_rbe,omitempty"`
-	ForceUseGoma         *bool    `protobuf:"varint,3,opt,name=force_use_goma,json=forceUseGoma" json:"force_use_goma,omitempty"`
+	UseGoma      *bool `protobuf:"varint,1,opt,name=use_goma,json=useGoma" json:"use_goma,omitempty"`
+	UseRbe       *bool `protobuf:"varint,2,opt,name=use_rbe,json=useRbe" json:"use_rbe,omitempty"`
+	ForceUseGoma *bool `protobuf:"varint,3,opt,name=force_use_goma,json=forceUseGoma" json:"force_use_goma,omitempty"`
+	// Whether the Bazel is acting as the Ninja executor for this build.
+	BazelAsNinja *bool `protobuf:"varint,4,opt,name=bazel_as_ninja,json=bazelAsNinja" json:"bazel_as_ninja,omitempty"`
+	// Whether build is occurring in a mixed build mode, where Bazel maintains the
+	// definition and build of some modules in cooperation with Soong.
+	BazelMixedBuild      *bool    `protobuf:"varint,5,opt,name=bazel_mixed_build,json=bazelMixedBuild" json:"bazel_mixed_build,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -487,6 +492,20 @@
 	return false
 }
 
+func (m *BuildConfig) GetBazelAsNinja() bool {
+	if m != nil && m.BazelAsNinja != nil {
+		return *m.BazelAsNinja
+	}
+	return false
+}
+
+func (m *BuildConfig) GetBazelMixedBuild() bool {
+	if m != nil && m.BazelMixedBuild != nil {
+		return *m.BazelMixedBuild
+	}
+	return false
+}
+
 type SystemResourceInfo struct {
 	// The total physical memory in bytes.
 	TotalPhysicalMemory *uint64 `protobuf:"varint,1,opt,name=total_physical_memory,json=totalPhysicalMemory" json:"total_physical_memory,omitempty"`
@@ -990,92 +1009,94 @@
 }
 
 var fileDescriptor_6039342a2ba47b72 = []byte{
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 }
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index 91d8dd9..b284bf9 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -116,6 +116,13 @@
   optional bool use_rbe = 2;
 
   optional bool force_use_goma = 3;
+
+  // Whether the Bazel is acting as the Ninja executor for this build.
+  optional bool bazel_as_ninja = 4;
+
+  // Whether build is occurring in a mixed build mode, where Bazel maintains the
+  // definition and build of some modules in cooperation with Soong.
+  optional bool bazel_mixed_build = 5;
 }
 
 message SystemResourceInfo {