What is this?

This is nmupdhostnames, a bash script for (NetworkManager)[https://networkmanager.dev/] to automatically update /etc/hosts file with two hostnames that you can define in a config file, one for the IP address of the hotspot device and one for the IP address that it assigns to the device running NetworkManager, when NetworkManager uses one of the connections that you also can define in the same config file.

Installation

Clone this repo on the device running NetworkManager:

git clone https://git.lattuga.net/Jones/nmupdhostnames.git

Enter its local directory:

cd nmupdhostnames

Edit nmupdhostnames.conf (each setting is explained in a comment there).

Change nmupdhostnames.conf mode to make it readable and writeable only by its owner:

chmod 600 nmupdhostnames.conf

Change nmupdhostnames.bash mode to make it readable, writeable and executable only by its owner:

chmod 700 nmupdhostnames.bash

Change nmupdhostnames.conf and nmupdhostnames.bash owner to root:

sudo chown root:root nmupdhostnames.*

Copy nmupdhostnames.conf into /etc:

sudo cp nmupdhostnames.conf /etc

Copy nmupdhostnames.bash to /etc/NetworkManager/dispatcher.d:

sudo cp nmupdhostnames.bash /etc/NetworkManager/dispatcher.d

Done :-)

Usage

When nmupdhostnames adds or updates the two hostnames in /etc/hosts, or if an error occurs, it tells with a message in the system log.

Disinstallation

Delete /etc/NetworkManager/dispatcher.d/nmupdhostnames.bash:

sudo rm /etc/NetworkManager/dispatcher.d/nmupdhostnames.bash

Optionally delete /etc/nmupdhostnames.conf:

sudo rm /etc/nmupdhostnames.conf