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_start_if_enabled() {
    if systemctl -q is-enabled gogs.service ;then
        echo "  Starting gogs service"
        systemctl start gogs.service
    fi
}

_stop_if_active() {
    if systemctl -q is-active gogs.service ;then
        echo "  Stoping gogs service"
        systemctl stop gogs.service
    fi
}

_disable_if_enabled() {
    if systemctl -q is-enabled gogs.service 2>/dev/null ;then
        echo "  Disabling gogs service"
        systemctl disable gogs.service
    fi
}

pre_install() {
    if ! getent group gogs >/dev/null; then
        groupadd --system gogs
    fi
    if ! getent passwd gogs >/dev/null; then
        useradd -r -c 'Gogs service user' -g gogs -d /srv/gogs -s /bin/bash gogs
        passwd -q -l gogs
    else
        local _OldHome="$( getent passwd gogs | cut -d: -f6 )"
        if [[ ${_OldHome} != "/srv/gogs" ]]; then
            echo "  Setting gogs home directory to /srv/gogs"
            echo "  You must migrate from ${_OldHome}"
            echo "  before starting or re-enabling service"
            usermod -c 'Gogs service user' -g gogs -d /srv/gogs -L -s /bin/bash gogs
            _disable_if_enabled
        fi
    fi
}

post_install(){
    systemctl daemon-reload
    echo "  If you do not have a custom configuration files finish the setup:"
    echo "    1) systemctl start gogs.service"
    echo "    2) open the installation page http://$(uname -n):3000/"
    echo "  Otherwise:"
    echo "    Place your custom configuration files in /srv/gogs/custom/conf"
    echo "  The default configuration file is located at"
    echo "  /usr/share/gogs/conf/app.ini.default"
}

pre_upgrade() {
    _stop_if_active
    pre_install
}

post_upgrade() {
    systemctl daemon-reload

    local _CustConf=/srv/gogs/custom/conf/app.ini
    local _OldConf=/etc/gogs/app.ini

    if  [[ -f ${_OldConf}.pacsave ]] && [[ ! -f ${_CustConf} ]] ; then
        install -Dm0750 -d -o gogs -g gogs /srv/gogs
        install -Dm0750 -d -o gogs -g gogs /srv/gogs/custom
        install -Dm0750 -d -o gogs -g gogs /srv/gogs/custom/conf
        install -Dm0640 -T -o gogs -g gogs ${_OldConf}.pacsave ${_CustConf}
        echo "  ${_OldConf} copied to"
        echo "  ${_CustConf}."
        echo "  You may need to manually delete"
        echo "  an old config file:"
        echo "  ${_OldConf}"
    fi
    _start_if_enabled
}

pre_remove() {
    _stop_if_active
    _disable_if_enabled
}

post_remove() {
    if getent passwd gogs >/dev/null; then
        userdel gogs
    fi
    if getent group gogs >/dev/null; then
        groupdel gogs
    fi
    systemctl daemon-reload
    echo "  You may need to manually delete an old workdir /srv/gogs"
}