Use product variables from the overridden apex

override_apex's bp2build converter had a bug where it was looking at
the product variables for the override_apex module itself instead of
for the base module it is overriding.

Fixes: 271424349
Test: go test
Change-Id: If1e2653d3751fa908faf0ab97dfa2e943ebe98ec

bp2build/apex_conversion_test.go

@@ -61,7 +61,10 @@ func registerOverrideApexModuleTypes(ctx android.RegistrationContext) {
 	ctx.RegisterModuleType("android_app_certificate", java.AndroidAppCertificateFactory)
 	ctx.RegisterModuleType("filegroup", android.FileGroupFactory)
 	ctx.RegisterModuleType("apex", apex.BundleFactory)
+	ctx.RegisterModuleType("apex_defaults", apex.DefaultsFactory)
 	ctx.RegisterModuleType("prebuilt_etc", etc.PrebuiltEtcFactory)
+	ctx.RegisterModuleType("soong_config_module_type", android.SoongConfigModuleTypeFactory)
+	ctx.RegisterModuleType("soong_config_string_variable", android.SoongConfigStringVariableDummyFactory)
 }
 
 func TestApexBundleSimple(t *testing.T) {
@@ -1359,3 +1362,87 @@ apex_test {
 			}),
 		}})
 }
+
+func TestApexBundle_overridePlusProductVars(t *testing.T) {
+	// Reproduction of b/271424349
+	// Tests that overriding an apex that uses product variables correctly copies the product var
+	// selects over to the override.
+	runOverrideApexTestCase(t, Bp2buildTestCase{
+		Description:                "apex - overriding a module that uses product vars",
+		ModuleTypeUnderTest:        "override_apex",
+		ModuleTypeUnderTestFactory: apex.OverrideApexFactory,
+		Blueprint: `
+soong_config_string_variable {
+    name: "library_linking_strategy",
+    values: [
+        "prefer_static",
+    ],
+}
+
+soong_config_module_type {
+    name: "library_linking_strategy_apex_defaults",
+    module_type: "apex_defaults",
+    config_namespace: "ANDROID",
+    variables: ["library_linking_strategy"],
+    properties: [
+        "manifest",
+        "min_sdk_version",
+    ],
+}
+
+library_linking_strategy_apex_defaults {
+    name: "higher_min_sdk_when_prefer_static",
+    soong_config_variables: {
+        library_linking_strategy: {
+            // Use the R min_sdk_version
+            prefer_static: {},
+            // Override the R min_sdk_version to min_sdk_version that supports dcla
+            conditions_default: {
+                min_sdk_version: "31",
+            },
+        },
+    },
+}
+
+filegroup {
+	name: "foo-file_contexts",
+	srcs: [
+		"com.android.apogee-file_contexts",
+	],
+	bazel_module: { bp2build_available: false },
+}
+
+apex {
+	name: "foo",
+	defaults: ["higher_min_sdk_when_prefer_static"],
+	min_sdk_version: "30",
+	package_name: "pkg_name",
+	file_contexts: ":foo-file_contexts",
+}
+override_apex {
+	name: "override_foo",
+	base: ":foo",
+	package_name: "override_pkg_name",
+}
+`,
+		ExpectedBazelTargets: []string{
+			MakeBazelTarget("apex", "foo", AttrNameToString{
+				"file_contexts": `":foo-file_contexts"`,
+				"manifest":      `"apex_manifest.json"`,
+				"min_sdk_version": `select({
+        "//build/bazel/product_variables:android__library_linking_strategy__prefer_static": "30",
+        "//conditions:default": "31",
+    })`,
+				"package_name": `"pkg_name"`,
+			}), MakeBazelTarget("apex", "override_foo", AttrNameToString{
+				"base_apex_name": `"foo"`,
+				"file_contexts":  `":foo-file_contexts"`,
+				"manifest":       `"apex_manifest.json"`,
+				"min_sdk_version": `select({
+        "//build/bazel/product_variables:android__library_linking_strategy__prefer_static": "30",
+        "//conditions:default": "31",
+    })`,
+				"package_name": `"override_pkg_name"`,
+			}),
+		}})
+}