Raspberry Pi OS • How to request reboot when building a postinst script in package

Code:

need_reboot="false"$device_bus="/dev/i2c-1"if [ ! -c $device_bus ]; then  # The I2C bus doesn't exist so we have to add it to /boot/firmware/config.txt  # and then do a reboot before weather station can run  need_reboot="true"  #  # Check if there is a line that sets the i2c_arm parameter  #  if [ ! grep -q "^\s*dtparam=i2c_arm=on" $firmware_config_file ]; then    #    # We have to add the dtparam=i2c_arm=on line to the config.txt file    # Check if there is a commented out line    if [ grep -q "^.*#.*dtparam=i2c_arm" $firmware_config_file ]; then      #      # There is a line for i2c_arm, but it is commented out.      # Change the line to remove comment and set to on      #      sed -i 's/^.*#.*dtparam=i2c_arm.*/dtparam=i2c_arm=on/' $firmware_config_file    elif [ grep -q "^.*dtparam=i2c_arm=off" $firmware_config_file ]; then      #      # arm_i2c is specifically set to off. Change the line to set to on      #      sed -i 's/^.*dtparam=i2c_arm=off.*/dtparam=i2c_arm=on/' $firmware_config_file    else      #      # I2c_arm is not set to off nor is there a commented out line so just add      # a line for it      # (I am not sure if it can go to the end of the file or not. That might      #  put it under category [all] which may be a problem. I am not sure)      cat "dtparam=i2c_arm=on" >> $firmware_config_file    fi  fifisystemctl daemon-reload## Whether we need to reboot or not Check if it is enabled. If not enable it#systemctl -q is-enabled $qw_serviceif [ $? -ne 0 ]; then  systemctl -q enable $qw_servicefi## If we don't need to reboot to get the I2C bus device go# ahead and start the service if it isn't already running.#if [ $need_reboot = "false" ]; then  #  # Check if it is already running. If not start it  #  systemctl -q is-active $qw_service  if [ $? -ne 0 ]; then    systemctl -q start $qw_service  fifi