post_install() {
    post_upgrade
    echo "NOTE: To use adb as a normal user you have to add yourself to the adbusers group"
}

post_upgrade() {
    { getent group adbusers || /usr/sbin/groupadd adbusers; } &>/dev/null
}

post_remove() {
    getent group adbusers &>/dev/null && /usr/sbin/groupdel adbusers
}