chore: change to native nix scripts

pkgs/flake/swarsel-postinstall/default.nix

@@ -1,6 +1,79 @@
-{ self, name, writeShellApplication, git }:
+{ name, writeShellApplication, git, ... }:
 writeShellApplication {
   inherit name;
   runtimeInputs = [ git ];
-  text = builtins.readFile "${self}/files/scripts/${name}.sh";
+  text = ''
+    set -eo pipefail
+
+    target_config="hotel"
+    target_user="swarsel"
+
+    function help_and_exit() {
+      echo
+      echo "Locally installs SwarselSystem on this machine."
+      echo
+      echo "USAGE: $0 -d <disk> [OPTIONS]"
+      echo
+      echo "ARGS:"
+      echo "  -d <disk>                               specify disk to install on."
+      echo "  -n <target_config>                      specify the nixos config to deploy."
+      echo "                                          Default: hotel"
+      echo "                                          Default: hotel"
+      echo "  -u <target_user>                        specify user to deploy for."
+      echo "                                          Default: swarsel"
+      echo "  -h | --help                             Print this help."
+      exit 0
+    }
+
+    function green() {
+      echo -e "\x1B[32m[+] $1 \x1B[0m"
+      if [ -n "''${2-}" ]; then
+        echo -e "\x1B[32m[+] $($2) \x1B[0m"
+      fi
+    }
+
+    while [[ $# -gt 0 ]]; do
+      case "$1" in
+      -n)
+        shift
+        target_config=$1
+        ;;
+      -u)
+        shift
+        target_user=$1
+        ;;
+      -h | --help) help_and_exit ;;
+      *)
+        echo "Invalid option detected."
+        help_and_exit
+        ;;
+      esac
+      shift
+    done
+
+    function cleanup() {
+      sudo rm -rf .cache/nix
+      sudo rm -rf /root/.cache/nix
+    }
+    trap cleanup exit
+
+    sudo rm -rf .cache/nix
+    sudo rm -rf /root/.cache/nix
+
+    green "~SwarselSystems~ remote post-installer"
+
+    cd /home/"$target_user"/.dotfiles
+
+    SECUREBOOT="$(nix eval ~/.dotfiles#nixosConfigurations."$target_config".config.swarselsystems.isSecureBoot)"
+
+    if [[ $SECUREBOOT == "true" ]]; then
+      green "Setting up secure boot keys"
+      sudo mkdir -p /var/lib/sbctl
+      sbctl create-keys || true
+      sbctl enroll-keys --ignore-immutable --microsoft || true
+    fi
+
+    sudo nixos-rebuild --flake .#"$target_config" switch
+    green "Post-install finished!"
+  '';
 }