Add devshell

overlays/default.nix

@@ -73,6 +73,7 @@ in rec {
 	hms = prev.callPackage ./hms.nix {
 		pkgs = final.pkgs;
 	};
+	inject = prev.callPackage ./inject.nix { inherit (final) pkgs; };
 	setup-ssh = prev.callPackage ./setup-ssh.nix {
 		pkgs = final.pkgs;
 	};

overlays/inject.nix

@@ -0,0 +1,3 @@
+{ pkgs, ... }:
+
+pkgs.writeShellScriptBin "inject-nixos-config" (builtins.readFile ./inject.sh)

overlays/inject.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+hostname="${1}"
+if [ -n "${hostname}"]; then
+	echo "You must provide a hostname";
+	exit 1;
+fi
+
+curl -L -o "${HOME}/nixos-config.tar.gz" https://github.com/greg-hellings/nixos-config/archive/refs/heads/main.tar.gz
+tar xaf "${HOME}/nixos-config.tar.gz" -C "${HOME}"
+sudo mv /etc/nixos /etc/nixos.bk
+sudo mv "${HOME}/nixos-config-main/" /etc/nixos
+mkdir -p "/etc/nixos/hosts/${hostname}"
+
+# Prepares everything for the flake usage
+cp /etc/nixos.bk/configuration.nix "/etc/nixos/hosts/${hostname}/default.nix"
+cp /etc/nixos.bk/hardware-configuration.nix "/etc/nixos/hosts/${hostname}/hardware-configuration.nix"
+
+# Prepares it for injecting the use case into the flake usage
+cp /etc/nixos.bk/hardware-configuration.nix /etc/nixos
+
+echo "Now you should be able to just run 'nixos-rebuild switch' to enable the flake functionality"
+echo "After that and adding the entry to the flake, run 'nixos-rebuild boot --flake '.#${hostname}' and reboot"
+