freebsd-ports/mail/postfix20/pkg-install

#!/bin/sh

user=postfix
group=postfix
group2=maildrop

ask() {
    local question default answer

    question=$1
    default=$2
    if [ -z "${PACKAGE_BUILDING}" ]; then
        read -p "${question} [${default}]? " answer
    fi
    if [ x${answer} = x ]; then
        answer=${default}
    fi
    echo ${answer}
}

yesno() {
    local dflt question answer

    question=$1
    dflt=$2
    while :; do
        answer=$(ask "${question}" "${dflt}")
        case "${answer}" in
        [Yy]*)          return 0;;
        [Nn]*)          return 1;;
        esac
        echo "Please answer yes or no."
    done
}

if pw groupshow "${group}" 2>/dev/null; then
    echo "You already have a group \"${group}\", so I will use it."
else
    echo "You need a group \"${group}\"."
    if yesno "Would you like me to create it" y; then
        pw groupadd ${group} -h - || exit
        echo "Done."
    else
        echo "Please create it, and try again."
        exit 1
    fi
fi

if pw groupshow "${group2}" 2>/dev/null; then
    echo "You already have a group \"${group2}\", so I will use it."
else
    echo "You need a group \"${group2}\"."
    if yesno "Would you like me to create it" y; then
        pw groupadd ${group2} -h - || exit
        echo "Done."
    else
        echo "Please create it, and try again."
        exit 1
    fi
fi

if pw user show "${user}" 2>/dev/null; then
    echo "You already have a user \"${user}\", so I will use it."
else
    echo "You need a user \"${user}\"."
    if yesno "Would you like me to create it" y; then
        pw useradd ${user} -g ${group} -h - -d /nonexistent \
            -s /nonexistent -c "Postfix Mail System" || exit
        echo "Done."
    else
        echo "Please create it, and try again."
        exit 1
    fi
fi

chown root:maildrop ${PREFIX}/sbin/postdrop
chmod 2755 ${PREFIX}/sbin/postdrop