This Linux-based shell script automatically updates your system timezone and adjusts your display's color temperature based on your current IP geolocation. This script is designed to work with NetworkManager's dispatcher, and triggers whenever your network connection goes up.

1. Linux with NetworkManager: To check if NetworkManager is installed, use the command nmcli -v. This will return the installed version, or an error if it's not installed.

2. X server (e.g. X11): To check if you are using X, run ps -e | grep tty. As long as "Xorg" appears in the process list, you're using X.

3. curl: To check for curl, run curl --version. If it doesn't show a version, run sudo apt install curl to install curl.

This script has been tested on:

• Linux 5.10.0-14-amd64 #1 SMP Debian 5.10.113-1 (2022-04-29) x86_64 GNU/Linux
• Linux casta 5.10.133 #1 SMP PREEMPT Sat Nov 19 21:06:46 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

Check your system using uname -a.

The update_timezone script, located at /etc/NetworkManager/dispatcher.d/update_timezone, executes the following steps:

1. Logs the script start, network interface, and status.
2. If the network interface status is "up":
   • Updates the system timezone with tzupdate.
   • Retrieves and saves current latitude and longitude using the ipinfo.io API.
   • Kills any running xflux instances.
   • Starts a new xflux instance with the new latitude and longitude.
3. Logs the script execution end.

If you're interested in Redshift: Although xflux is closed source, redshift is not working well for some people with debian/ubuntu/archlinux. You could modify the script to work with redshift reasonably easily as well. for example, replacing the line calling xflux with: redshift -l $LAT:$LON.

1. Clone the repository and copy the script to /etc/NetworkManager/dispatcher.d/, ensuring it's executable:

   git clone https://github.com/morganrivers/timezone_and_flux_from_ip.git
   sudo cp timezone_and_flux_from_ip/etc/NetworkManager/dispatcher.d/update_timezone /etc/NetworkManager/dispatcher.d/
   sudo chmod +x /etc/NetworkManager/dispatcher.d/update_timezone
   

2. Install tzupdate and xflux:

   • For tzupdate: sudo pip install -U tzupdate

   • For xflux, download from here and run:

     tar zxvf xflux64.tgz
     ./xflux
     sudo cp xflux /usr/local/bin/
     

3. If you'd also like to have xflux on startup, you can place the xflux_on_startup.sh script in /etc/X11/xinit/xinitrc.d.

   sudo mkdir -p /etc/X11/xinit/xinitrc.d/
   sudo cp etc/X11/xinit/xinitrc.d/xflux_on_startup.sh /etc/X11/xinit/xinitrc.d/
   sudo chmod +x /etc/X11/xinit/xinitrc.d/xflux_on_startup.sh
   

   You will also need to modify your .xinitrc if it doesn't already have the following lines. Add these lines at the bottom if they're not already in the ~/.xinitrc script. Watch out not to put it after an exec command, such as exec i3 or similiar!

   # Start the scripts located in /etc/X11/xinit/xinitrc.d after the x server launches
   if [ -d /etc/X11/xinit/xinitrc.d ] ; then
     for f in /etc/X11/xinit/xinitrc.d/?*.sh ; do
       [ -x "$f" ] && . "$f"
       done
     unset f
   fi
   

The script triggers automatically upon establishing a network connection using NetworkManager, updating the timezone and adjusting screen temperature only if the timezone changes.

Connect to a network, e.g., via Wi-Fi:

nmcli device wifi connect <your_network> password <your_password>

The startup script will automatically kill any xflux and start on boot as well. This will only work if you've connected to the internet, as xflux needs latitude and longitude information to set the correct color temperature.

You'd need to use a text editor to edit /etc/X11/xinit/xinitrc.d/xflux_on_startup.sh and /etc/NetworkManager/dispatcher.d/update_timezone.

To change the redness, you would edit the line in both files:

xflux -l $LAT -g $LON -k 2000

You can change the 2000 after the "-k" to be some other temperature. 2000 is the lowest xflux allows, and a little less red and more blue is 2500, 3000 or 4000.

• tzupdate: Updates the system timezone.
• curl: Makes API calls.
• xflux: Adjusts display's color temperature.
• nmcli: NetworkManager command-line tool.