Merge "protect all /cache/recovery/last_* files from deletion"

    private static File RECOVERY_DIR = new File("/cache/recovery");

    private static File COMMAND_FILE = new File(RECOVERY_DIR, "command");

    private static File LOG_FILE = new File(RECOVERY_DIR, "log");

    private static String LAST_LOG_FILENAME = "last_log";

    private static String LAST_PREFIX = "last_";

    // Length limits for reading files.

    private static int LOG_FILE_MAX_LENGTH = 64 * 1024;

            Log.e(TAG, "Error reading recovery log", e);

        }

        // Delete everything in RECOVERY_DIR except LAST_LOG_FILENAME

        // Delete everything in RECOVERY_DIR except those beginning

        // with LAST_PREFIX

        String[] names = RECOVERY_DIR.list();

        for (int i = 0; names != null && i < names.length; i++) {

            if (names[i].equals(LAST_LOG_FILENAME)) continue;

            if (names[i].startsWith(LAST_PREFIX)) continue;

            File f = new File(RECOVERY_DIR, names[i]);

            if (!f.delete()) {

                Log.e(TAG, "Can't delete: " + f);