shell: add flk up command

Automatically generate a configuration for your current system using
nixos-generate-config, placed in the `up` directory. A file is added in
hosts/up-$(hostname).nix importing said configuration.

README.md

@@ -104,12 +104,9 @@ for ease of use. Once inside:
 # This will setup nix-command and pull in the needed tools
 nix-shell # or `direnv allow` if you prefer
 
-# quick way to setup your fileSystems (assuming they are partioned):
-sudo mount /dev/<install-drive> /mnt
-nixos-generate-config --root /mnt --show-hardware-config > hosts/yourConfig.nix
-
-# Edit your config to add a bootloader
-$EDITOR hosts/yourConfig.nix
+# use nixos-generate-config to generate a basic config for your system
+# edit hosts/up-$(hostname).nix to modify.
+flk up
 
 # The following should work fine for EFI systems.
 # boot.loader.systemd-boot.enable = true;

shell.nix

@@ -17,7 +17,14 @@ let
 
   flk = pkgs.writeShellScriptBin "flk" ''
     if [[ -z "$1" ]]; then
-      echo "Usage: $(basename "$0") [ iso | install {host} | {host} [switch|boot|test] ]"
+      echo "Usage: $(basename "$0") [ iso | up | install {host} | {host} [switch|boot|test] ]"
+    elif [[ "$1" == "up" ]]; then
+      mkdir -p up
+      nixos-generate-config --dir up
+      echo \
+      "{
+      imports = [ ../up/configuration.nix ];
+    }" > hosts/up-$(hostname).nix
     elif [[ "$1" == "iso" ]]; then
       nix build ${configs}.niximg.${build}.isoImage
     elif [[ "$1" == "install" ]]; then