post_install() {
    local pkgver=${1%-*}

    getent group brscan-skey &> /dev/null || groupadd -g 289 brscan-skey
    getent passwd brscan-skey &> /dev/null || useradd -c "Brother scan-key-tool user" -u 289 -g brscan-skey -d /srv/brscan-skey -s /bin/false brscan-skey

    echo "Start automatically by running one of the following:"
    echo "  # systemctl enable brscan-skey.service         # System-wide"
    echo "  $ systemctl --user enable brscan-skey.service  # Per-user"
}

pre_upgrade() {
    local oldpkgverrel=$2
    local oldpkgver=${2%-*}

    if (( $(vercmp $oldpkgver 0.2.3) < 0 )); then
      # Pre 0.2.3
      /usr/local/Brother/sane/brscan-skey-${oldpkgver//_/-}.sh R
    elif (( $(vercmp $oldpkgverrel 0.2.4_1-7) <= 0 )); then
      # 0.2.4_1-7 and earlier
      pre_remove $oldpkgverrel # Deletes brscan-skey user and group which had wrong UID and GID
    fi
    if (( $(vercmp $oldpkgverrel 0.3.0) < 0 )); then
      # before 0.3.0 there were version specific install/uninstall scripts
      /opt/brother/scanner/brscan-skey/brscan-skey-${oldpkgver//_/-}.sh R
    fi
}

post_upgrade() {
    local newpkgverrel=$1

    post_install $newpkgverrel
}

pre_remove() {
    local pkgver=${1%-*}

    systemctl daemon-reload
    systemctl --quiet is-active brscan-skey.service && systemctl stop brscan-skey.service

    getent passwd brscan-skey &> /dev/null && userdel brscan-skey
    getent group brscan-skey &> /dev/null && groupdel brscan-skey || true
}