distro-packages: add test for deb installation

pkgs/distro-packages/gui-installer/flake-module.nix

@@ -0,0 +1,33 @@
+{
+  perSystem =
+    { pkgs, ... }:
+    let
+      nfpmConfig = pkgs.writeText "clan-nfpm-config.yaml" (
+
+        builtins.toJSON {
+          name = "clan-gui-installer";
+          contents = [
+            {
+              src = "${./gui-installer.sh}";
+              dst = "/usr/bin/clan-vm-manager";
+            }
+          ];
+        }
+      );
+      installerFor =
+        packager:
+        pkgs.runCommand "gui-installer" { } ''
+          mkdir build
+          cd build
+          ${pkgs.nfpm}/bin/nfpm package --config ${nfpmConfig} --packager ${packager}
+          mkdir $out
+          mv * $out/
+        '';
+    in
+    {
+      packages.gui-installer-apk = installerFor "apk";
+      packages.gui-installer-archlinux = installerFor "archlinux";
+      packages.gui-installer-deb = installerFor "deb";
+      packages.gui-installer-rpm = installerFor "rpm";
+    };
+}

pkgs/distro-packages/gui-installer/gui-installer.sh

@@ -0,0 +1,66 @@
+#! /bin/sh
+
+# create temp dir and ensure it is always cleaned
+trap 'clean_temp_dir' EXIT
+temp_dir=$(mktemp -d)
+
+clean_temp_dir() {
+  rm -rf "$temp_dir"
+}
+
+is_installed() {
+  name=$1
+  if [ -n "$(command -v "$name")" ]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
+install_nix() {
+  if is_installed curl; then
+    curl --proto '=https' --tlsv1.2 -sSf -L \
+        https://install.determinate.systems/nix \
+      > "$temp_dir"/install_nix.sh
+  elif is_installed wget; then
+    wget -qO- \
+        https://install.determinate.systems/nix \
+      > "$temp_dir"/install_nix.sh
+  else
+    echo "Either curl or wget is required to install Nix. Exiting."
+    exit 1
+  fi
+  NIX_INSTALLER_DIAGNOSTIC_ENDPOINT="" sh "$temp_dir"/install_nix.sh install
+}
+
+ask_then_install_nix() {
+  echo "Clan requires Nix to be installed. Would you like to install it now? (y/n)"
+  read -r response
+  if [ "$response" = "y" ]; then
+    install_nix
+  else
+    echo "Clan cannot run without Nix. Exiting."
+    exit 1
+  fi
+}
+
+ensure_nix_installed() {
+  if ! is_installed nix; then
+    ask_then_install_nix
+  fi
+}
+
+start_clan_gui() {
+  PATH="${PATH:+$PATH:}/nix/var/nix/profiles/default/bin" \
+    exec nix run \
+      https://git.clan.lol/clan/clan-core/archive/main.tar.gz#clan-vm-manager \
+      --no-accept-flake-config \
+      --extra-experimental-features flakes nix-command -- "$@"
+}
+
+main() {
+  ensure_nix_installed
+  start_clan_gui "$@"
+}
+
+main "$@"