minecraft-server-fabric/minecraft-server-fabric.ins...

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_game="minecraft"
_user="minecraft"
_server_root="/srv/minecraft"
post_install() {
getent group "${_user}" &>/dev/null
if [ $? -ne 0 ]; then
echo "Adding ${_user} system group..."
groupadd -r ${_user} 1>/dev/null
fi
getent passwd "${_user}" &>/dev/null
if [ $? -ne 0 ]; then
echo "Adding ${_user} system user..."
useradd -r -g ${_user} -d "${_server_root}" ${_user} 1>/dev/null
fi
chown -R ${_user}:${_user} "${_server_root}"
echo "The world data is stored under ${_server_root} and the server runs as ${_user} user to increase security."
echo "Use the ${_game} script under /usr/bin/${_game}d to start, stop or backup the server."
echo "Adjust the configuration file under /etc/conf.d/${_game} to your liking."
echo "For the server to start you have to accept the EULA in ${_server_root}/eula.txt !"
echo "The EULA file is generated after the first server start."
}
post_upgrade() {
chown -R ${_user}:${_user} "${_server_root}"
}
post_remove() {
# Notifying the user of kept dirs
[[ -d "${_server_root}" ]] && echo "Game saves in ${_server_root} were kept on your system."
echo "The ${_user} user was preserved on your system."
}