Add more virtualization guest tools, regular tools, and update README

Author: AnarchoBooleanism

README.md

@@ -1,10 +1,12 @@
 # nixos-cloud-init-installer
 A minimal NixOS flake with cloud-init designed for use as an installer ISO image for provisioning virtual machines
 
-This was designed to be used to provision new NixOS virtual machines on a Proxmox host, while allowing the dynamic configuration of disks and other hardware.
+This was designed to be used to provision new NixOS virtual machines on a Proxmox host (via QEMU/KVM), while allowing the dynamic configuration of disks and other hardware. However, this should also support other hypervisors, including VirtualBox, Hyper-V, Xen, and VMWare.
 
 There exist pre-built ISO images that you are able to download, for both x86_64 and aarch64, in this repository's releases. 
 
+**NOTE:** SSH login via password is disabled, for security reasons! Instead, it is recommended to pass public SSH keys to NixOS via cloud-init when using this installer. However, for ease of installation, no password is required to use sudo.
+
 ## Steps to build this image yourself:
 
 This assumes that you have Nix installed on your system, with flakes and nix-commands enabled.

configuration.nix

@@ -8,20 +8,30 @@
   # Boot faster
   boot.loader.timeout = lib.mkForce 2;
 
-  # Enabling things for easy connectivity and for integration with Proxmox
+  # Enabling things for easy connectivity and for integration with Proxmox, as well as other hypervisors
   services.cloud-init.enable = true;
   services.openssh = {
     enable = true;
     settings.PermitRootLogin = "prohibit-password";
   };
   services.qemuGuest.enable = true;
+  services.spice-vdagentd.enable = true;
+  virtualisation.virtualbox.guest.enable = true;
+  virtualisation.hypervGuest.enable = true;
 
-  # For convenience of installation
+  # For convenience of installation/debugging
   security.sudo.wheelNeedsPassword = false;
   environment.systemPackages = with pkgs; [
     nano
+    vim
+    man-db
     git
     curl
+    rsync
     htop
+    bash-completion
+    # More guest agents
+    xen-guest-agent
+    open-vm-tools
   ];
 }