bluetooth: convert to apex

* Use device as an identifier in package names so APEXs on rpi4/rpi5 trees
  can co-exist. Somehow apex definitions escape the soong namespace. It
  doesn't complain about duplicate package names but dependecies later in
  the build after analyzing Android.bp files and generating ninja file.
  FAILED: ninja: ... multiple rules generate com.android.hardware.bluetooth.rpi-deps-info [-w dupbuild=err]
  https://android.googlesource.com/platform/build/soong/+/refs/heads/main/README.md#namespaces
* Not sure if this is an AOSP bug or intended behaviour for apex targets.
  Don't like using the rpi4/rpi5 tags but couldn't come up with better
  solution to limit the visibility that worked.
* General cleanups. As APEX package contains all dependencies that are
  needed for the service, remove unused shared libraries.
  Run 'bpfmt -s -w Android.bp'.

bluetooth/Android.bp

@@ -6,28 +6,51 @@
 cc_binary {
     name: "android.hardware.bluetooth-service.rpi",
     relative_install_path: "hw",
-    init_rc: ["bluetooth-service-rpi.rc"],
-    vintf_fragments: ["bluetooth-service-rpi.xml"],
     vendor: true,
-    cflags: [
-        "-Wall",
-        "-Wextra",
-    ],
     srcs: [
         "BluetoothHci.cpp",
+        "main.cpp",
         "net_bluetooth_mgmt.cpp",
-        "service.cpp",
-    ],
-    shared_libs: [
-        "android.hardware.bluetooth-V1-ndk",
-        "libbase",
-        "libbinder_ndk",
-        "libhidlbase",
-        "liblog",
-        "libutils",
     ],
     static_libs: [
         "android.hardware.bluetooth.async",
         "android.hardware.bluetooth.hci",
     ],
+    shared_libs: [
+        "android.hardware.bluetooth-V1-ndk",
+        "libbase",
+        "libbinder_ndk",
+        "liblog",
+        "libutils",
+    ],
+    installable: false,
+}
+
+prebuilt_etc {
+    name: "android.hardware.bluetooth-service.rpi.rc",
+    src: "android.hardware.bluetooth-service.rpi.rc",
+    installable: false,
+}
+
+prebuilt_etc {
+    name: "android.hardware.bluetooth-service.rpi.xml",
+    src: "android.hardware.bluetooth-service.rpi.xml",
+    sub_dir: "vintf",
+    installable: false,
+}
+
+apex {
+    name: "com.android.hardware.bluetooth.rpi4",
+    manifest: "apex_manifest.json",
+    file_contexts: "apex_file_contexts",
+    key: "com.android.hardware.key",
+    certificate: ":com.android.hardware.certificate",
+    updatable: false,
+    vendor: true,
+
+    binaries: ["android.hardware.bluetooth-service.rpi"],
+    prebuilts: [
+        "android.hardware.bluetooth-service.rpi.rc",
+        "android.hardware.bluetooth-service.rpi.xml",
+    ],
 }

bluetooth/android.hardware.bluetooth-service.rpi.rc

@@ -1,4 +1,4 @@
-service vendor.bluetooth-default /vendor/bin/hw/android.hardware.bluetooth-service.rpi
+service vendor.bluetooth-rpi /apex/com.android.hardware.bluetooth.rpi4/bin/hw/android.hardware.bluetooth-service.rpi
     class hal
     capabilities BLOCK_SUSPEND NET_ADMIN SYS_NICE
     user bluetooth

bluetooth/apex_file_contexts

@@ -0,0 +1,3 @@
+(/.*)?                                             u:object_r:vendor_file:s0
+/etc(/.*)?                                         u:object_r:vendor_configs_file:s0
+/bin/hw/android\.hardware\.bluetooth-service\.rpi  u:object_r:hal_bluetooth_default_exec:s0

bluetooth/apex_manifest.json

@@ -0,0 +1,4 @@
+{
+    "name": "com.android.hardware.bluetooth.rpi4",
+    "version": 1
+}

bluetooth/main.cpp

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ * Copyright (C) 2024 KonstaKANG
+ *
+ * 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.
+ */
+
+#include "BluetoothHci.h"
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+using ::aidl::android::hardware::bluetooth::impl::BluetoothHci;
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+    std::shared_ptr<BluetoothHci> bluetooth = ndk::SharedRefBase::make<BluetoothHci>();
+
+    const std::string instance = std::string() + BluetoothHci::descriptor + "/default";
+    binder_status_t status = AServiceManager_addService(bluetooth->asBinder().get(), instance.c_str());
+    CHECK(status == STATUS_OK);
+
+    ABinderProcess_joinThreadPool();
+    return EXIT_FAILURE;  // should not reach
+}

bluetooth/service.cpp

@@ -1,50 +0,0 @@
-/*
- * Copyright (C) 2022 The Android Open Source Project
- * Copyright (C) 2024 KonstaKANG
- *
- * 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.
- */
-
-#define LOG_TAG "aidl.android.hardware.bluetooth.service.rpi"
-
-#include <aidl/android/hardware/bluetooth/IBluetoothHci.h>
-#include <android/binder_manager.h>
-#include <android/binder_process.h>
-#include <hidl/HidlSupport.h>
-#include <hidl/HidlTransportSupport.h>
-
-#include "BluetoothHci.h"
-
-using ::aidl::android::hardware::bluetooth::impl::BluetoothHci;
-using ::android::hardware::configureRpcThreadpool;
-using ::android::hardware::joinRpcThreadpool;
-
-int main(int /* argc */, char** /* argv */) {
-  ALOGI("Bluetooth HAL starting");
-  if (!ABinderProcess_setThreadPoolMaxThreadCount(0)) {
-    ALOGI("failed to set thread pool max thread count");
-    return 1;
-  }
-
-  std::shared_ptr<BluetoothHci> service =
-      ndk::SharedRefBase::make<BluetoothHci>();
-  std::string instance = std::string() + BluetoothHci::descriptor + "/default";
-  auto result =
-      AServiceManager_addService(service->asBinder().get(), instance.c_str());
-  if (result == STATUS_OK) {
-    ABinderProcess_joinThreadPool();
-  } else {
-    ALOGE("Could not register as a service!");
-  }
-  return 0;
-}