Add pending system update info system APIs.

This CL adds system APIs in android.os.SystemUpdateManager. The APIs allow
system updater apps (RECOVERY permission required) to publish the pending
system update information, and allow other apps to query the info
accordingly (requiring RECOVERY or READ_SYSTEM_UPDATE_INFO permission).

Design doc in go/pi-ota-platform-api.

Bug: 67437079
Test: Use test apps to call the new APIs to query and set the update info
      respectively.
Change-Id: Id54b4a48d02922d2abd906dd7e2ec80a656fc9b1
diff --git a/core/java/android/app/SystemServiceRegistry.java b/core/java/android/app/SystemServiceRegistry.java
index 6eafcc4..b5662cb 100644
--- a/core/java/android/app/SystemServiceRegistry.java
+++ b/core/java/android/app/SystemServiceRegistry.java
@@ -112,6 +112,7 @@
 import android.os.IHardwarePropertiesManager;
 import android.os.IPowerManager;
 import android.os.IRecoverySystem;
+import android.os.ISystemUpdateManager;
 import android.os.IUserManager;
 import android.os.IncidentManager;
 import android.os.PowerManager;
@@ -119,6 +120,7 @@
 import android.os.RecoverySystem;
 import android.os.ServiceManager;
 import android.os.ServiceManager.ServiceNotFoundException;
+import android.os.SystemUpdateManager;
 import android.os.SystemVibrator;
 import android.os.UserHandle;
 import android.os.UserManager;
@@ -485,6 +487,17 @@
                 return new StorageStatsManager(ctx, service);
             }});
 
+        registerService(Context.SYSTEM_UPDATE_SERVICE, SystemUpdateManager.class,
+                new CachedServiceFetcher<SystemUpdateManager>() {
+                    @Override
+                    public SystemUpdateManager createService(ContextImpl ctx)
+                            throws ServiceNotFoundException {
+                        IBinder b = ServiceManager.getServiceOrThrow(
+                                Context.SYSTEM_UPDATE_SERVICE);
+                        ISystemUpdateManager service = ISystemUpdateManager.Stub.asInterface(b);
+                        return new SystemUpdateManager(service);
+                    }});
+
         registerService(Context.TELEPHONY_SERVICE, TelephonyManager.class,
                 new CachedServiceFetcher<TelephonyManager>() {
             @Override
diff --git a/core/java/android/content/Context.java b/core/java/android/content/Context.java
index f69e764..e374bbc 100644
--- a/core/java/android/content/Context.java
+++ b/core/java/android/content/Context.java
@@ -3024,7 +3024,8 @@
             //@hide: INCIDENT_SERVICE,
             //@hide: STATS_COMPANION_SERVICE,
             COMPANION_DEVICE_SERVICE,
-            CROSS_PROFILE_APPS_SERVICE
+            CROSS_PROFILE_APPS_SERVICE,
+            //@hide: SYSTEM_UPDATE_SERVICE,
     })
     @Retention(RetentionPolicy.SOURCE)
     public @interface ServiceName {}
@@ -3242,6 +3243,17 @@
 
     /**
      * Use with {@link #getSystemService(String)} to retrieve a
+     * {@link android.os.SystemUpdateManager} for accessing the system update
+     * manager service.
+     *
+     * @see #getSystemService(String)
+     * @hide
+     */
+    @SystemApi
+    public static final String SYSTEM_UPDATE_SERVICE = "system_update";
+
+    /**
+     * Use with {@link #getSystemService(String)} to retrieve a
      * {@link android.view.WindowManager} for accessing the system's window
      * manager.
      *
diff --git a/core/java/android/os/ISystemUpdateManager.aidl b/core/java/android/os/ISystemUpdateManager.aidl
new file mode 100644
index 0000000..f7f5079
--- /dev/null
+++ b/core/java/android/os/ISystemUpdateManager.aidl
@@ -0,0 +1,27 @@
+/* //device/java/android/android/os/ISystemUpdateInfo.aidl
+**
+** Copyright 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.
+*/
+
+package android.os;
+
+import android.os.Bundle;
+import android.os.PersistableBundle;
+
+/** @hide */
+interface ISystemUpdateManager {
+    Bundle retrieveSystemUpdateInfo();
+    void updateSystemUpdateInfo(in PersistableBundle data);
+}
diff --git a/core/java/android/os/SystemUpdateManager.java b/core/java/android/os/SystemUpdateManager.java
new file mode 100644
index 0000000..ce3e2259
--- /dev/null
+++ b/core/java/android/os/SystemUpdateManager.java
@@ -0,0 +1,152 @@
+/*
+ * 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.
+ */
+
+package android.os;
+
+import static com.android.internal.util.Preconditions.checkNotNull;
+
+import android.annotation.RequiresPermission;
+import android.annotation.SystemApi;
+import android.annotation.SystemService;
+import android.content.Context;
+
+/**
+ * Allows querying and posting system update information.
+ *
+ * {@hide}
+ */
+@SystemApi
+@SystemService(Context.SYSTEM_UPDATE_SERVICE)
+public class SystemUpdateManager {
+    private static final String TAG = "SystemUpdateManager";
+
+    /** The status key of the system update info, expecting an int value. */
+    @SystemApi
+    public static final String KEY_STATUS = "status";
+
+    /** The title of the current update, expecting a String value. */
+    @SystemApi
+    public static final String KEY_TITLE = "title";
+
+    /** Whether it is a security update, expecting a boolean value. */
+    @SystemApi
+    public static final String KEY_IS_SECURITY_UPDATE = "is_security_update";
+
+    /** The build fingerprint after installing the current update, expecting a String value. */
+    @SystemApi
+    public static final String KEY_TARGET_BUILD_FINGERPRINT = "target_build_fingerprint";
+
+    /** The security patch level after installing the current update, expecting a String value. */
+    @SystemApi
+    public static final String KEY_TARGET_SECURITY_PATCH_LEVEL = "target_security_patch_level";
+
+    /**
+     * The KEY_STATUS value that indicates there's no update status info available.
+     */
+    @SystemApi
+    public static final int STATUS_UNKNOWN = 0;
+
+    /**
+     * The KEY_STATUS value that indicates there's no pending update.
+     */
+    @SystemApi
+    public static final int STATUS_IDLE = 1;
+
+    /**
+     * The KEY_STATUS value that indicates an update is available for download, but pending user
+     * approval to start.
+     */
+    @SystemApi
+    public static final int STATUS_WAITING_DOWNLOAD = 2;
+
+    /**
+     * The KEY_STATUS value that indicates an update is in progress (i.e. downloading or installing
+     * has started).
+     */
+    @SystemApi
+    public static final int STATUS_IN_PROGRESS = 3;
+
+    /**
+     * The KEY_STATUS value that indicates an update is available for install.
+     */
+    @SystemApi
+    public static final int STATUS_WAITING_INSTALL = 4;
+
+    /**
+     * The KEY_STATUS value that indicates an update will be installed after a reboot. This applies
+     * to both of A/B and non-A/B OTAs.
+     */
+    @SystemApi
+    public static final int STATUS_WAITING_REBOOT = 5;
+
+    private final ISystemUpdateManager mService;
+
+    /** @hide */
+    public SystemUpdateManager(ISystemUpdateManager service) {
+        mService = checkNotNull(service, "missing ISystemUpdateManager");
+    }
+
+    /**
+     * Queries the current pending system update info.
+     *
+     * <p>Requires the {@link android.Manifest.permission#READ_SYSTEM_UPDATE_INFO} or
+     * {@link android.Manifest.permission#RECOVERY} permission.
+     *
+     * @return A {@code Bundle} that contains the pending system update information in key-value
+     * pairs.
+     *
+     * @throws SecurityException if the caller is not allowed to read the info.
+     */
+    @SystemApi
+    @RequiresPermission(anyOf = {
+            android.Manifest.permission.READ_SYSTEM_UPDATE_INFO,
+            android.Manifest.permission.RECOVERY,
+    })
+    public Bundle retrieveSystemUpdateInfo() {
+        try {
+            return mService.retrieveSystemUpdateInfo();
+        } catch (RemoteException re) {
+            throw re.rethrowFromSystemServer();
+        }
+    }
+
+    /**
+     * Allows a system updater to publish the pending update info.
+     *
+     * <p>The reported info will not persist across reboots. Because only the reporting updater
+     * understands the criteria to determine a successful/failed update.
+     *
+     * <p>Requires the {@link android.Manifest.permission#RECOVERY} permission.
+     *
+     * @param infoBundle The {@code PersistableBundle} that contains the system update information,
+     * such as the current update status. {@link #KEY_STATUS} is required in the bundle.
+     *
+     * @throws IllegalArgumentException if @link #KEY_STATUS} does not exist.
+     * @throws SecurityException if the caller is not allowed to update the info.
+     */
+    @SystemApi
+    @RequiresPermission(android.Manifest.permission.RECOVERY)
+    public void updateSystemUpdateInfo(PersistableBundle infoBundle) {
+        if (infoBundle == null || !infoBundle.containsKey(KEY_STATUS)) {
+            throw new IllegalArgumentException("Missing status in the bundle");
+        }
+        try {
+            mService.updateSystemUpdateInfo(infoBundle);
+        } catch (RemoteException re) {
+            throw re.rethrowFromSystemServer();
+        }
+    }
+}
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index d2a22d0..cfd7c95 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -2309,6 +2309,11 @@
     <permission android:name="android.permission.RECOVERY"
         android:protectionLevel="signature|privileged" />
 
+    <!-- @SystemApi Allows an application to read system update info.
+         @hide -->
+    <permission android:name="android.permission.READ_SYSTEM_UPDATE_INFO"
+        android:protectionLevel="signature" />
+
     <!-- Allows the system to bind to an application's task services
          @hide -->
     <permission android:name="android.permission.BIND_JOB_SERVICE"