File debian.postinst of Package nullmailer

#!/bin/sh

getent group mail >/dev/null || groupadd -r mail
getent group adm >/dev/null || groupadd -r adm
getent passwd mail >/dev/null || useradd -r -g mail -d "/usr/lib/nullmailer/service" -s /sbin/nologin -c "User for nullmailer" mail

chown -R mail:mail /var/spool/nullmailer /usr/sbin/nullmailer-queue
chmod go-rwx /var/spool/nullmailer/*
chown mail:mail /usr/sbin/nullmailer-queue
chmod 4711 /usr/sbin/nullmailer-queue
chown mail:adm /usr/bin/mailq
chmod 4710 /usr/bin/mailq
chown mail:adm /var/log/nullmailer
chmod g+s /var/log/nullmailer

if ! [ -s "/etc/nullmailer/me" ]; then
        hostname --fqdn >"/etc/nullmailer/me"
fi
if ! [ -s "/etc/nullmailer/defaultdomain" ]; then
        hostname --domain >"/etc/nullmailer/defaultdomain"
fi

if [ -d /etc/service -a ! -d /etc/service/nullmailer ]; then
    touch /usr/lib/nullmailer/service/down
    ln -s /usr/lib/nullmailer/service /etc/service/nullmailer
fi