# PK_VERSION
# PK_ARCHIVE

pkunpack() {
    if [ ${PK_ARCHIVE: -7} == ".tar.gz" ]; then
        if ! tar -xzf "$DOWNLOAD_PACKET_DIR/$PK_ARCHIVE"; then
            return 1
        fi
    elif [ ${PK_ARCHIVE: -7} == ".tgz" ]; then
        if ! tar -xzf "$DOWNLOAD_PACKET_DIR/$PK_ARCHIVE"; then
            return 1
        fi
    else
        if ! tar -xf "$DOWNLOAD_PACKET_DIR/$PK_ARCHIVE"; then
            return 1
        fi
    fi

    if [ -z "$PK_VERSION" ]; then
        PK_VERSION="$(pkhook_version)"
        [ $? -eq 0 ] || return 1
    fi
    echo "$PK_VERSION" > "$UNPACK_PACKET_DIR/version-$NAME"
    [ $? -eq 0 ] || return 1
    return 0
}