#!/bin/sh

set -e

# NOTE: This package name detection will only work on Debian.
# If this postinst script ever starts doing work on Red Hat,
# we'll need to adapt this code accordingly.
script="$(basename "${0}")"
pkg="${script%.postinst}"
systemd_unit="${pkg}.service"

case "${1}" in
    configure)
        if [ -d /lib/systemd/system ]
        then
            # Python packages put all data files in /usr, so we copy
            # them to /lib at install time.
            py_unit="/usr/share/doc/${pkg}/${pkg}.service"
            if [ -e "${py_unit}" ]
            then
                cp "${py_unit}" /lib/systemd/system/
            fi
        fi

        if [ -e /run/systemd/system ]; then
            eval "$(systemctl -p UnitFileState show "${systemd_unit}")"
            case "${UnitFileState}" in
                disabled)
                    # Failing to enable or start the service is not a
                    # package error, so don't let errors here
                    # propagate up.
                    systemctl enable "${systemd_unit}" || true
                    systemctl start "${systemd_unit}" || true
                    ;;
                enabled)
                    systemctl daemon-reload || true
                    systemctl reload-or-try-restart "${systemd_unit}" || true
                    ;;
            esac
        fi
        ;;
esac