add wait_for_keymaster

Bug: 79228237
Test: boots with patch
Change-Id: I581bcd4c4dd92c5b7be70eb351ecba20225e1eee

Android.bp

@@ -163,6 +163,7 @@ cc_binary {
     required: [
         "mke2fs",
         "vold_prepare_subdirs",
+        "wait_for_keymaster",
     ],
 }
 
@@ -183,6 +184,28 @@ cc_binary {
     init_rc: ["vdc.rc"],
 }
 
+cc_binary {
+    name: "wait_for_keymaster",
+    defaults: ["vold_default_flags"],
+
+    srcs: [
+        "wait_for_keymaster.cpp",
+        "Keymaster.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+        "libbinder",
+
+        "android.hardware.keymaster@3.0",
+        "android.hardware.keymaster@4.0",
+        "libhardware",
+        "libhardware_legacy",
+        "libhidlbase",
+        "libhwbinder",
+        "libkeymaster4support",
+    ],
+}
+
 cc_binary {
     name: "secdiscard",
     defaults: ["vold_default_flags"],

wait_for_keymaster.cpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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 <android-base/logging.h>
+
+#include "Keymaster.h"
+
+int main(int argc, char** argv) {
+    setenv("ANDROID_LOG_TAGS", "*:v", 1);
+    if (getppid() == 1) {
+        // If init is calling us then it's during boot and we should log to kmsg
+        android::base::InitLogging(argv, &android::base::KernelLogger);
+    } else {
+        android::base::InitLogging(argv, &android::base::StderrLogger);
+    }
+    LOG(INFO) << "Waiting for Keymaster device";
+    android::vold::Keymaster keymaster;
+    LOG(INFO) << "Keymaster device ready";
+    return 0;
+}