Merge "[Multi-user] Whitelist "android" for non-system user backup"

import static com.android.server.backup.BackupManagerService.TAG;

import static com.android.server.backup.UserBackupManagerService.PACKAGE_MANAGER_SENTINEL;

import static com.android.server.backup.UserBackupManagerService.SHARED_BACKUP_AGENT_PACKAGE;

import static com.android.server.pm.PackageManagerService.PLATFORM_PACKAGE_NAME;

import android.annotation.Nullable;

import android.app.AppGlobals;

import com.android.internal.util.ArrayUtils;

import com.android.server.backup.transport.TransportClient;

import com.google.android.collect.Sets;

import java.util.Set;

/**

 * Utility methods wrapping operations on ApplicationInfo and PackageInfo.

 */

public class AppBackupUtils {

    private static final boolean DEBUG = false;

    // Whitelist of system packages that are eligible for backup in non-system users.

    private static final Set<String> systemPackagesWhitelistedForAllUsers =

            Sets.newArraySet(PACKAGE_MANAGER_SENTINEL, PLATFORM_PACKAGE_NAME);

    /**

     * Returns whether app is eligible for backup.

        // 2. they run as a system-level uid

        if (UserHandle.isCore(app.uid)) {

            // and the backup is happening for non-system user

            if (userId != UserHandle.USER_SYSTEM && !app.packageName.equals(

                    PACKAGE_MANAGER_SENTINEL)) {

            // and the backup is happening for non-system user on a non-whitelisted package.

            if (userId != UserHandle.USER_SYSTEM

                    && !systemPackagesWhitelistedForAllUsers.contains(app.packageName)) {

                return false;

            }