Merge "Condionally remove the block map file."

    /** Used to communicate with recovery.  See bootable/recovery/recovery.cpp. */

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

    private static File BLOCK_MAP_FILE = new File(RECOVERY_DIR, "block.map");

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

    private static File UNCRYPT_FILE = new File(RECOVERY_DIR, "uncrypt_file");

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

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

        }

        if (UNCRYPT_FILE.exists()) {

        // Only remove the OTA package if it's partially processed (uncrypt'd).

        boolean reservePackage = BLOCK_MAP_FILE.exists();

        if (!reservePackage && UNCRYPT_FILE.exists()) {

            String filename = null;

            try {

                filename = FileUtils.readTextFile(UNCRYPT_FILE, 0, null);

            }

        }

        // Delete everything in RECOVERY_DIR except those beginning

        // with LAST_PREFIX

        // We keep the update logs (beginning with LAST_PREFIX), and optionally

        // the block map file (BLOCK_MAP_FILE) for a package. BLOCK_MAP_FILE

        // will be created at the end of a successful uncrypt. If seeing this

        // file, we keep the block map file and the file that contains the

        // package name (UNCRYPT_FILE). This is to reduce the work for GmsCore

        // to avoid re-downloading everything again.

        String[] names = RECOVERY_DIR.list();

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

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

            if (reservePackage && names[i].equals(BLOCK_MAP_FILE.getName())) continue;

            if (reservePackage && names[i].equals(UNCRYPT_FILE.getName())) continue;

            recursiveDelete(new File(RECOVERY_DIR, names[i]));

        }