install-reLuminate.sh

#!/usr/bin/env bash
# Created with inspiration from https://github.com/rM-self-serve/webinterface-onboot/blob/master/install-webint-ob.sh

# --- Values replaced in github actions ---
version='VERSION'
# -----------------------------------------

installfile='./install-reLuminate.sh'
pkgname='reLuminate'
servicefile="/lib/systemd/system/${pkgname}.service"

main() {
  case "$@" in
    'install' | '')
      install
        ;;
    'remove')
        remove
        ;;
    *)
        echo 'input not recognized'
        cli_info
        exit 0
        ;;
    esac
}

cli_info() {
    echo "${pkgname} installer ${version}"
    echo -e "${CYAN}COMMANDS:${NC}"
    echo '  install'
    echo '  remove'
    echo ''
}

install() {
    echo "Install ${pkgname} ${version}"

    # Make file system writeable
    echo "Remounting file system"
    umount -l /etc
    mount -o remount,rw /

    # Create reLuminate systemd service file
    echo "Creating systemd service file"
    cat > $servicefile <<EOF
    [Unit]
    Description=Enable linear_mapping for reading light
    After=multi-user.target

    [Service]
    Type=oneshot
    RemainAfterExit=yes
    ExecStart=/bin/sh -c 'echo yes > /sys/class/backlight/rm_frontlight/linear_mapping'
    ExecStartPost=/bin/sh -c 'cat /sys/class/backlight/rm_frontlight/max_brightness > /sys/class/backlight/rm_frontlight/brightness'
    ExecStop=/bin/sh -c 'echo no > /sys/class/backlight/rm_frontlight/linear_mapping'
    ExecStopPost=/bin/sh -c 'echo 260 > /sys/class/backlight/rm_frontlight/brightness'

    [Install]
    WantedBy=multi-user.target
EOF

    # Start service
    echo "Enabling $pkgname"
    systemctl daemon-reload
    systemctl enable ${pkgname} --now

    echo "Finished installing $pkgname"
}

remove() {
    echo "Remove ${pkgname}"

    echo "Disabling $pkgname"
    systemctl disable "$pkgname" --now

    # Remove service file and install file
    [[ -f $servicefile ]] && rm $servicefile
    [[ -f $installfile ]] && rm $installfile

    echo "Finished removing ${pkgname}"
}

main "$@"