Add interactive session launch option

flake.nix

@@ -11,7 +11,9 @@
       citrixDownloadPageUrl = "https://www.citrix.com/downloads/workspace-app/legacy-workspace-app-for-linux/workspace-app-for-linux-250810.html";
       citrixTarballHash = "sha256-bd3ClxBRJgvjJW+waKBE31k9ePam+n2pHeSjlkvkDRo=";
 
-      disclaimer = ''
+      dtccVdiUrl = "https://myvdi.dtcc.com";
+
+      icaDisclaimer = ''
         WARNING: ICA files are only good to be used ONCE. If you've logged into the DTCC virtual
         desktop using it before, you will get a connection error from Citrix upon trying to log in
         with it again. To get a fresh ICA file, you need to _refresh_ your myvdi.dtcc.com page and
@@ -38,6 +40,10 @@
           citrix_workspace = super.citrix_workspace.overrideAttrs (_: {
             src = scripts.citrixTarballScraper;
           });
+          ungoogled-chromium = super.ungoogled-chromium.override {
+            # Disables the prompt to create a default keyring on initial startup.
+            commandLineArgs = "--password-store=basic";
+          };
         })
       ];
     };
@@ -78,10 +84,12 @@
         )
 
         if [[ ''${#files[@]} -eq 0 ]]; then
-          echo "No .ica files found in $download_dir or $PWD" >&2
+          echo "No .ica files found in $download_dir or $PWD." >&2
-          return 1
+          return 0
         fi
 
+        echo "${constants.icaDisclaimer}" >&2
+
         echo "Available .ica files:" >&2
         for i in "''${!files[@]}"; do
           echo "  $((i+1))) ''${files[$i]}" >&2
@@ -89,27 +97,40 @@
 
         local selection
         while true; do
-          read -rp "Select file [1-''${#files[@]}] (default: 1): " selection >&2
+          read -rp "Select file [1-''${#files[@]}] (leave blank to start interactive session): " \
-          selection="''${selection:-1}"
+            selection >&2
-          if [[ "$selection" =~ ^[0-9]+$ ]] && \
+          if [[ -z "$selection" ]] || \
-             (( selection >= 1 && selection <= ''${#files[@]} )); then
+             ([[ "$selection" =~ ^[0-9]+$ ]] && \
+             (( selection >= 1 && selection <= ''${#files[@]} ))); then
             break
           fi
-          echo "Invalid selection, please enter a number between 1 and ''${#files[@]}" >&2
+          echo "Invalid selection, please enter a number between 1 and ''${#files[@]}." >&2
+          echo "Or leave blank to start an interactive session."
         done
 
-        echo "''${files[$((selection-1))]}"
+        if [[ -n "$selection" ]]; then
+          echo "''${files[$((selection-1))]}"
+        fi
       }
 
-      echo "${constants.disclaimer}"
-
       ica_file=$(select_ica_file)
-
       mkdir -p /tmp/dtcc-onboarding
-      cp "$ica_file" /tmp/dtcc-onboarding/dtcc-ica.ica
+      if [[ -n "''${ica_file}" ]]; then
+        cp "$ica_file" /tmp/dtcc-onboarding/dtcc-ica.ica
+      else
+        echo "Launching interactive session..." >&2
+      fi
 
       ${self.nixosConfigurations.dtcc-onboarding.config.system.build.vm}/bin/run-nixos-vm
     '';
+
+    scripts.autolaunch = pkgs.writeShellScriptBin "autolaunch" ''
+      if [[ -f /mnt/ica/dtcc-ica.ica ]]; then
+        ${pkgs.citrix_workspace}/bin/wfica /mnt/ica/dtcc-ica.ica
+      else
+        ${pkgs.ungoogled-chromium}/bin/chromium ${constants.dtccVdiUrl}
+      fi
+    '';
   in {
     nixosConfigurations.dtcc-onboarding = nixpkgs.lib.nixosSystem {
       inherit pkgs;
@@ -117,6 +138,12 @@
       modules = [
         "${nixpkgs}/nixos/modules/virtualisation/qemu-vm.nix"
         ({ pkgs, ... }: {
+          environment.systemPackages = with pkgs; [
+            citrix_workspace
+            ungoogled-chromium
+            gnomeExtensions.no-overview
+          ];
+
           services = {
             displayManager.gdm = {
               enable = true;
@@ -141,11 +168,6 @@
             }];
           };
 
-          environment.systemPackages = with pkgs; [
-            citrix_workspace
-            gnomeExtensions.no-overview
-          ];
-
           users.users.nixos = {
             isNormalUser = true;
             extraGroups = [ "wheel" ];
@@ -154,12 +176,39 @@
 
           security.sudo.wheelNeedsPassword = false;
 
-          systemd.user.services.launch-citrix = {
+          xdg.mime.enable = true;
+
+          environment.etc."share/applications/mimeapps.list".text = ''
+            [Default Applications]
+            application/x-ica=wfica.desktop
+          '';
+
+          environment.etc."share/applications/wfica.desktop".text = ''
+            [Desktop Entry]
+            Type=Application
+            Name=Citrix Workspace
+            Exec=wfica %f
+            MimeType=application/x-ica;
+            NoDisplay=true
+          '';
+
+          environment.etc."chromium/policies/managed/default-browser.json".text = builtins.toJSON {
+            DefaultBrowserSettingEnabled = false;
+          };
+
+          environment.etc."chromium/policies/managed/downloads.json".text = builtins.toJSON {
+            PromptForDownloadLocation = false;
+            AutoOpenFileTypes = [ "ica" ];
+          };
+
+          # Launches Citrix or Chromium depending on whether the user specified a file on init.
+          systemd.user.services.autolaunch = {
             description = "Launch Citrix ICA session";
             wantedBy = [ "graphical-session.target" ];
             after = [ "graphical-session.target" ];
+            environment.PATH = pkgs.lib.mkForce "/run/current-system/sw/bin:/run/wrappers/bin";
             serviceConfig = {
-              ExecStart = "${pkgs.bash}/bin/bash -c '${pkgs.citrix_workspace}/bin/wfica /mnt/ica/dtcc-ica.ica'";
+              ExecStart = "${scripts.autolaunch}/bin/autolaunch";
               Restart = "no";
               Type = "oneshot";
             };
@@ -173,7 +222,8 @@
             msize = 128 * 1024;
             diskSize = 12 * 1024; 
             qemu.options = [
-              "-vga virtio"
+              "-vga none"
+              "-device virtio-vga"
             ];
             sharedDirectories = {
               default = {