arch-automated-installer/scripts/system-setup/sources-setup.sh

#!/bin/bash

if [[ $1 == "Debian" ]]; then

    echo "$1 Sources Setup"
    echo "apt-get update && apt-get -y upgrade"
    while true;do
        read -rp "Would you like to use Debian Unstable? (y/n): " answer
        answer="${answer,,}"
        if [[ "$answer" = "y" ]]; then
            echo "Changing apt sources"
            echo "cp -v ./debian-assets/debian-sid-sources.list /etc/apt/sources.list"
            echo "apt-get update && apt-get -y dist-upgrade"
            break
        elif [[ "$answer" = "n" ]]; then
            echo "Proceeding with Debian Stable"
            break
        else
            echo "Invalid Input. Please enter 'y' or 'n'."
        fi
    done

elif [[ $1 == "Arch" ]]; then
    echo "$1 Sources Setup"
fi