health: fix running HAL in recovery mode.

- Add proper RC files
- overrides charger.recovery
- update readme for implementing recovery mode

Test: pass
Bug: 177269435
Change-Id: Id60b57978e4e5bf78af32bd67523333ba0c2a04d
diff --git a/health/aidl/default/Android.bp b/health/aidl/default/Android.bp
index a13c677..8aa7638 100644
--- a/health/aidl/default/Android.bp
+++ b/health/aidl/default/Android.bp
@@ -23,8 +23,6 @@
 
 cc_defaults {
     name: "libhealth_aidl_common_defaults",
-    recovery_available: true,
-    vendor: true,
     shared_libs: [
         "libbase",
         "libbinder_ndk",
@@ -100,6 +98,8 @@
         "libhealth_aidl_common_defaults",
         "libhealth_aidl_charger_defaults",
     ],
+    vendor: true,
+    recovery_available: true,
     export_include_dirs: ["include"],
     export_static_lib_headers: [
         "libbatterymonitor",
@@ -122,10 +122,9 @@
 
 // AIDL version of android.hardware.health@2.1-service.
 // Default binder service of the health HAL.
-cc_binary {
-    name: "android.hardware.health-service.example",
+cc_defaults {
+    name: "android.hardware.health-service.example-defaults",
     relative_install_path: "hw",
-    init_rc: ["android.hardware.health-service.example.rc"],
     vintf_fragments: ["android.hardware.health-service.example.xml"],
     defaults: [
         "libhealth_aidl_common_defaults",
@@ -135,7 +134,20 @@
         "libhealth_aidl_impl",
     ],
     srcs: ["main.cpp"],
-    overrides: [
-        "charger",
-    ],
+}
+
+cc_binary {
+    name: "android.hardware.health-service.example",
+    vendor: true,
+    defaults: ["android.hardware.health-service.example-defaults"],
+    init_rc: ["android.hardware.health-service.example.rc"],
+    overrides: ["charger"],
+}
+
+cc_binary {
+    name: "android.hardware.health-service.example_recovery",
+    recovery: true,
+    defaults: ["android.hardware.health-service.example-defaults"],
+    init_rc: ["android.hardware.health-service.example_recovery.rc"],
+    overrides: ["charger.recovery"],
 }
diff --git a/health/aidl/default/android.hardware.health-service.example_recovery.rc b/health/aidl/default/android.hardware.health-service.example_recovery.rc
new file mode 100644
index 0000000..0001170
--- /dev/null
+++ b/health/aidl/default/android.hardware.health-service.example_recovery.rc
@@ -0,0 +1,7 @@
+service vendor.health-default /system/bin/hw/android.hardware.health-service.example_recovery
+    class hal
+    seclabel u:r:hal_health_default:s0
+    user system
+    group system
+    capabilities WAKE_ALARM BLOCK_SUSPEND
+    file /dev/kmsg w
diff --git a/health/aidl/default/main.cpp b/health/aidl/default/main.cpp
index 76c6ba0..03b2ecb 100644
--- a/health/aidl/default/main.cpp
+++ b/health/aidl/default/main.cpp
@@ -39,14 +39,16 @@
 static constexpr std::string_view gChargerArg{"--charger"};
 
 int main(int argc, char** argv) {
+#ifdef __ANDROID_RECOVERY__
+    android::base::InitLogging(argv, android::base::KernelLogger);
+#endif
+
     // make a default health service
     auto config = std::make_unique<healthd_config>();
     ::android::hardware::health::InitHealthdConfig(config.get());
     auto binder = ndk::SharedRefBase::make<Health>(gInstanceName, std::move(config));
 
     if (argc >= 2 && argv[1] == gChargerArg) {
-        android::base::InitLogging(argv, &android::base::KernelLogger);
-
 #if !CHARGER_FORCE_NO_UI
         // If charger shouldn't have UI for your device, simply drop the line below
         // for your service implementation. This corresponds to