From 40cba6fd9be41e3298caa5d16c0a032757a0b934 Mon Sep 17 00:00:00 2001
From: Sleeyax <yourd3veloper@gmail.com>
Date: Sun, 19 May 2024 18:28:51 +0200
Subject: [PATCH] add vm host (closes #13)

---
 flake.nix                           |  5 +++++
 hosts/vm/default.nix                | 26 ++++++++++++++++++++++++
 hosts/vm/hardware-configuration.nix | 31 +++++++++++++++++++++++++++++
 install.sh                          |  6 ++++--
 4 files changed, 66 insertions(+), 2 deletions(-)
 create mode 100644 hosts/vm/default.nix
 create mode 100644 hosts/vm/hardware-configuration.nix

diff --git a/flake.nix b/flake.nix
index 1fa040b..1e4fc90 100644
--- a/flake.nix
+++ b/flake.nix
@@ -60,6 +60,11 @@
         modules = [ (import ./hosts/laptop) ];
         specialArgs = { host="laptop"; inherit self inputs username ; };
       };
+       vm = nixpkgs.lib.nixosSystem {
+        inherit system;
+        modules = [ (import ./hosts/vm) ];
+        specialArgs = { host="vm"; inherit self inputs username ; };
+      };
     };
   };
 }
diff --git a/hosts/vm/default.nix b/hosts/vm/default.nix
new file mode 100644
index 0000000..b7a1124
--- /dev/null
+++ b/hosts/vm/default.nix
@@ -0,0 +1,26 @@
+{ pkgs, config, lib, ... }: 
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./../../modules/core
+  ];
+
+  # kvm/qemu doesn't use UEFI firmware mode by default.
+  # so we force-override the setting here 
+  # and configure GRUB instead.
+  boot.loader.systemd-boot.enable = lib.mkForce false;
+  boot.loader.grub.enable = true;
+  boot.loader.grub.device = "/dev/vda";
+  boot.loader.grub.useOSProber = false;
+
+  # allow local remote access to make it easier to toy around with the system
+  services.openssh = {
+    enable = true;
+    ports = [22];
+    settings = {
+      PasswordAuthentication = true;
+      AllowUsers = null;
+      PermitRootLogin = "yes";
+    };
+  };
+}
diff --git a/hosts/vm/hardware-configuration.nix b/hosts/vm/hardware-configuration.nix
new file mode 100644
index 0000000..7cd128a
--- /dev/null
+++ b/hosts/vm/hardware-configuration.nix
@@ -0,0 +1,31 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/631775ef-6851-4fe7-997f-189372f87437";
+      fsType = "ext4";
+    };
+
+  swapDevices = [ ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp1s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}
diff --git a/install.sh b/install.sh
index c2ce843..6340070 100755
--- a/install.sh
+++ b/install.sh
@@ -63,7 +63,7 @@ set_username() {
 }
 
 get_host() {
-    echo -en "Choose a ${GREEN}host${NORMAL}, either [${YELLOW}D${NORMAL}]esktop or [${YELLOW}L${NORMAL}]aptop: "
+    echo -en "Choose a ${GREEN}host${NORMAL} - [${YELLOW}D${NORMAL}]esktop, [${YELLOW}L${NORMAL}]aptop or [${YELLOW}V${NORMAL}]irtual machine: "
     read -n 1 -r
     echo
 
@@ -71,8 +71,10 @@ get_host() {
         HOST='desktop'
     elif [[ $REPLY =~ ^[Ll]$ ]]; then
         HOST='laptop'
+     elif [[ $REPLY =~ ^[Vv]$ ]]; then
+        HOST='vm'
     else
-        echo "Invalid choice. Please select either 'D' for desktop or 'L' for laptop."
+        echo "Invalid choice. Please select 'D' for desktop, 'L' for laptop or 'V' for virtual machine."
         exit 1
     fi