freebsd-ports/mail/nullmailer/pkg-install

#!/bin/sh

user=nullmail
group=nullmail

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 [ x"$2" = xPRE-INSTALL ]; then
    if /usr/sbin/pw groupshow "${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
            /usr/sbin/pw groupadd ${group} -g 522 -h - || exit
            echo "Done."
        else
            echo "Please create it, and try again."
            exit 1
        fi
    fi

    if /usr/sbin/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
            /usr/sbin/pw useradd ${user} -u 522 -g ${group} -h - -d ${PKG_PREFIX}/var/nullmailer \
                -s /bin/sh -c "Nullmailer Mail System" || exit
            echo "Done."
        else
            echo "Please create it, and try again."
            exit 1
        fi
    fi

fi