Setup network manager to work with tailwind

config-NetworkManager.sh

#!/bin/bash

# Define the path for the NetworkManager configuration file
CONFIG_FILE="/etc/NetworkManager/conf.d/99-tailscale.conf"

# Function to check if the script is run with sudo (root privileges)
check_root() {
    if [[ $EUID -ne 0 ]]; then
        echo "This script must be run as root (use sudo)."
        exit 1
    fi
}

# Function to create the config file
create_config_file() {
    echo "Creating the configuration file to unmanage tailscale network devices..."

    # Write the configuration to the file
    echo -e "[keyfile]\nunmanaged-devices=interface-name:tailscale0" | sudo tee "$CONFIG_FILE" > /dev/null

    echo "Configuration file created at $CONFIG_FILE."
}

# Function to restart NetworkManager
restart_networkmanager() {
    echo "Restarting NetworkManager..."
    sudo systemctl restart NetworkManager
    echo "NetworkManager restarted."
}

# Function to remove the config file
remove_config_file() {
    echo "Removing the configuration file..."

    sudo rm -f "$CONFIG_FILE" && echo "Configuration file removed."
}

# Function to check if the config file already exists
check_existing_file() {
    if [[ -f "$CONFIG_FILE" ]]; then
        return 0  # Indicate that the file exists
    else
        return 1  # Indicate that the file doesn't exist
    fi
}

# Function to ask for confirmation to remove the config file
ask_remove_confirmation() {
    read -p "The configuration file already exists at $CONFIG_FILE. Do you want to delete it? (y/n): " confirmation
    if [[ "$confirmation" =~ ^[Yy]$ ]]; then
        remove_config_file
        restart_networkmanager
    else
        echo "No changes made. Exiting script."
        exit 0
    fi
}

# Main logic of the script
check_root  # Ensure the script is run with root privileges

if check_existing_file; then
    # If the file exists, ask the user if they want to delete it
    ask_remove_confirmation
else
    # If the file doesn't exist, ask for confirmation to create it
    read -p "This will create a configuration file to unmanage the Tailscale device (tailscale0) and restart NetworkManager. Are you sure you want to proceed? (y/n): " confirmation
    if [[ "$confirmation" =~ ^[Yy]$ ]]; then
        create_config_file
        restart_networkmanager
    else
        echo "No changes made."
        exit 0
    fi
fi