Decouple the target build variant from the platform

Bug: 301334589
Test: Presubmits
Change-Id: Id8ac0874a2d132d9965e339fd8dc705a7434bffb
diff --git a/android/bazel_handler.go b/android/bazel_handler.go
index 4b98345..56ec17d 100644
--- a/android/bazel_handler.go
+++ b/android/bazel_handler.go
@@ -665,7 +665,8 @@
 		command.expression,
 		"--profile=" + shared.BazelMetricsFilename(context.paths, runName),
 
-		"--host_platform=@soong_injection//product_config_platforms:mixed_builds_product-" + context.targetBuildVariant + "_" + runtime.GOOS + "_x86_64",
+		"--host_platform=@soong_injection//product_config_platforms:mixed_builds_product_" + runtime.GOOS + "_x86_64",
+		"--//build/bazel/product_config:target_build_variant=" + context.targetBuildVariant,
 		// Don't specify --platforms, because on some products/branches (like kernel-build-tools)
 		// the main platform for mixed_builds_product-variant doesn't exist because an arch isn't
 		// specified in product config. The derivative platforms that config_node transitions into
@@ -720,9 +721,9 @@
 #####################################################
 def _config_node_transition_impl(settings, attr):
     if attr.os == "android" and attr.arch == "target":
-        target = "mixed_builds_product-{VARIANT}"
+        target = "mixed_builds_product"
     else:
-        target = "mixed_builds_product-{VARIANT}_%s_%s" % (attr.os, attr.arch)
+        target = "mixed_builds_product_%s_%s" % (attr.os, attr.arch)
     apex_name = ""
     if attr.within_apex:
         # //build/bazel/rules/apex:apex_name has to be set to a non_empty value,
@@ -794,11 +795,7 @@
 )
 `
 
-	productReplacer := strings.NewReplacer(
-		"{PRODUCT}", context.targetProduct,
-		"{VARIANT}", context.targetBuildVariant)
-
-	return []byte(productReplacer.Replace(contents))
+	return []byte(contents)
 }
 
 func (context *mixedBuildBazelContext) mainBuildFileContents() []byte {
@@ -972,9 +969,9 @@
   platform_name = platforms[0].name
   if platform_name == "host":
     return "HOST"
-  if not platform_name.startswith("mixed_builds_product-{TARGET_BUILD_VARIANT}"):
-    fail("expected platform name of the form 'mixed_builds_product-{TARGET_BUILD_VARIANT}_android_<arch>' or 'mixed_builds_product-{TARGET_BUILD_VARIANT}_linux_<arch>', but was " + str(platforms))
-  platform_name = platform_name.removeprefix("mixed_builds_product-{TARGET_BUILD_VARIANT}").removeprefix("_")
+  if not platform_name.startswith("mixed_builds_product"):
+    fail("expected platform name of the form 'mixed_builds_product_android_<arch>' or 'mixed_builds_product_linux_<arch>', but was " + str(platforms))
+  platform_name = platform_name.removeprefix("mixed_builds_product").removeprefix("_")
   config_key = ""
   if not platform_name:
     config_key = "target|android"
@@ -983,7 +980,7 @@
   elif platform_name.startswith("linux_"):
     config_key = platform_name.removeprefix("linux_") + "|linux"
   else:
-    fail("expected platform name of the form 'mixed_builds_product-{TARGET_BUILD_VARIANT}_android_<arch>' or 'mixed_builds_product-{TARGET_BUILD_VARIANT}_linux_<arch>', but was " + str(platforms))
+    fail("expected platform name of the form 'mixed_builds_product_android_<arch>' or 'mixed_builds_product_linux_<arch>', but was " + str(platforms))
 
   within_apex = buildoptions.get("//build/bazel/rules/apex:within_apex")
   apex_sdk_version = buildoptions.get("//build/bazel/rules/apex:min_sdk_version")
@@ -1012,8 +1009,6 @@
   return id_string + ">>NONE"
 `
 	replacer := strings.NewReplacer(
-		"{TARGET_PRODUCT}", context.targetProduct,
-		"{TARGET_BUILD_VARIANT}", context.targetBuildVariant,
 		"{LABEL_REGISTRATION_MAP_SECTION}", labelRegistrationMapSection,
 		"{FUNCTION_DEF_SECTION}", functionDefSection,
 		"{MAIN_SWITCH_SECTION}", mainSwitchSection)
diff --git a/bp2build/bp2build_product_config.go b/bp2build/bp2build_product_config.go
index 3d9cae0..2bbb2d7 100644
--- a/bp2build/bp2build_product_config.go
+++ b/bp2build/bp2build_product_config.go
@@ -53,9 +53,9 @@
 		return res, err
 	}
 
-	currentProductFolder := fmt.Sprintf("build/bazel/products/%s-%s", targetProduct, targetBuildVariant)
+	currentProductFolder := fmt.Sprintf("build/bazel/products/%s", targetProduct)
 	if len(productVariables.PartitionVars.ProductDirectory) > 0 {
-		currentProductFolder = fmt.Sprintf("%s%s-%s", productVariables.PartitionVars.ProductDirectory, targetProduct, targetBuildVariant)
+		currentProductFolder = fmt.Sprintf("%s%s", productVariables.PartitionVars.ProductDirectory, targetProduct)
 	}
 
 	productReplacer := strings.NewReplacer(
@@ -73,7 +73,7 @@
 	}
 
 	productLabelsToVariables := make(map[string]*android.ProductVariables)
-	productLabelsToVariables[productReplacer.Replace("@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}")] = &productVariables
+	productLabelsToVariables[productReplacer.Replace("@//{PRODUCT_FOLDER}:{PRODUCT}")] = &productVariables
 	for product, productVariablesStarlark := range productsForTestingMap {
 		productVariables, err := starlarkMapToProductVariables(productVariablesStarlark)
 		if err != nil {
@@ -84,10 +84,10 @@
 
 	res.bp2buildTargets = make(map[string]BazelTargets)
 	res.bp2buildTargets[currentProductFolder] = append(res.bp2buildTargets[currentProductFolder], BazelTarget{
-		name:        productReplacer.Replace("{PRODUCT}-{VARIANT}"),
+		name:        productReplacer.Replace("{PRODUCT}"),
 		packageName: currentProductFolder,
 		content: productReplacer.Replace(`android_product(
-    name = "{PRODUCT}-{VARIANT}",
+    name = "{PRODUCT}",
     soong_variables = _soong_variables,
 )`),
 		ruleClass: "android_product",
@@ -134,7 +134,7 @@
 # extra rebuilding, make mixed builds always use a single platform so that the bazel artifacts
 # are always under the same path.
 android_product(
-    name = "mixed_builds_product-{VARIANT}",
+    name = "mixed_builds_product",
     soong_variables = _soong_variables,
     extra_constraints = ["@//build/bazel/platforms:mixed_builds"],
 )
@@ -148,34 +148,35 @@
 # TODO: When we start generating the platforms for more than just the
 # currently lunched product, they should all be listed here
 product_labels = [
-  "@soong_injection//product_config_platforms:mixed_builds_product-{VARIANT}",
-  "@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}",
+  "@soong_injection//product_config_platforms:mixed_builds_product",
+  "@//{PRODUCT_FOLDER}:{PRODUCT}",
 `)+strings.Join(productsForTesting, "\n")+"\n]\n"),
 		newFile(
 			"product_config_platforms",
 			"common.bazelrc",
 			productReplacer.Replace(`
 build --platform_mappings=platform_mappings
-build --platforms @//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_linux_x86_64
+build --platforms @//{PRODUCT_FOLDER}:{PRODUCT}_linux_x86_64
+build --//build/bazel/product_config:target_build_variant={VARIANT}
 
-build:android --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}
-build:linux_x86 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_linux_x86
-build:linux_x86_64 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_linux_x86_64
-build:linux_bionic_x86_64 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_linux_bionic_x86_64
-build:linux_musl_x86 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_linux_musl_x86
-build:linux_musl_x86_64 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_linux_musl_x86_64
+build:android --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}
+build:linux_x86 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}_linux_x86
+build:linux_x86_64 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}_linux_x86_64
+build:linux_bionic_x86_64 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}_linux_bionic_x86_64
+build:linux_musl_x86 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}_linux_musl_x86
+build:linux_musl_x86_64 --platforms=@//{PRODUCT_FOLDER}:{PRODUCT}_linux_musl_x86_64
 `)),
 		newFile(
 			"product_config_platforms",
 			"linux.bazelrc",
 			productReplacer.Replace(`
-build --host_platform @//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_linux_x86_64
+build --host_platform @//{PRODUCT_FOLDER}:{PRODUCT}_linux_x86_64
 `)),
 		newFile(
 			"product_config_platforms",
 			"darwin.bazelrc",
 			productReplacer.Replace(`
-build --host_platform @//{PRODUCT_FOLDER}:{PRODUCT}-{VARIANT}_darwin_x86_64
+build --host_platform @//{PRODUCT_FOLDER}:{PRODUCT}_darwin_x86_64
 `)),
 	}
 	res.bp2buildFiles = []BazelFile{
@@ -237,12 +238,6 @@
 	soongConfigDefinitions soongconfig.Bp2BuildSoongConfigDefinitions,
 	convertedModulePathMap map[string]string,
 	result *strings.Builder) {
-	targetBuildVariant := "user"
-	if proptools.Bool(productVariables.Eng) {
-		targetBuildVariant = "eng"
-	} else if proptools.Bool(productVariables.Debuggable) {
-		targetBuildVariant = "userdebug"
-	}
 
 	platform_sdk_version := -1
 	if productVariables.Platform_sdk_version != nil {
@@ -270,7 +265,6 @@
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:cfi_exclude_paths=%s\n", strings.Join(productVariables.CFIExcludePaths, ",")))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:cfi_include_paths=%s\n", strings.Join(productVariables.CFIIncludePaths, ",")))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:compressed_apex=%t\n", proptools.Bool(productVariables.CompressedApex)))
-		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:debuggable=%t\n", proptools.Bool(productVariables.Debuggable)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:default_app_certificate=%s\n", proptools.String(productVariables.DefaultAppCertificate)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:default_app_certificate_filegroup=%s\n", defaultAppCertificateFilegroup))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:device_abi=%s\n", strings.Join(productVariables.DeviceAbi, ",")))
@@ -281,7 +275,6 @@
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:device_platform=%s\n", label))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:enable_cfi=%t\n", proptools.BoolDefault(productVariables.EnableCFI, true)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:enforce_vintf_manifest=%t\n", proptools.Bool(productVariables.Enforce_vintf_manifest)))
-		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:eng=%t\n", proptools.Bool(productVariables.Eng)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:malloc_not_svelte=%t\n", proptools.Bool(productVariables.Malloc_not_svelte)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:malloc_pattern_fill_contents=%t\n", proptools.Bool(productVariables.Malloc_pattern_fill_contents)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:malloc_zero_contents=%t\n", proptools.Bool(productVariables.Malloc_zero_contents)))
@@ -301,7 +294,6 @@
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:release_version=%s\n", productVariables.ReleaseVersion))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:platform_sdk_version=%d\n", platform_sdk_version))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:safestack=%t\n", proptools.Bool(productVariables.Safestack)))
-		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:target_build_variant=%s\n", targetBuildVariant))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:treble_linker_namespaces=%t\n", proptools.Bool(productVariables.Treble_linker_namespaces)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:tidy_checks=%s\n", proptools.String(productVariables.TidyChecks)))
 		result.WriteString(fmt.Sprintf("    --//build/bazel/product_config:uml=%t\n", proptools.Bool(productVariables.Uml)))