feat: add Vagrant powered demo (#7)

Signed-off-by: James Hillyerd <[email protected]>

.gitignore

@@ -24,3 +24,5 @@ go.work
 .direnv
 debug.log
 result
+/examples/vagrant-demo/.vagrant
+/labcoat

examples/vagrant-demo/Vagrantfile

@@ -0,0 +1,39 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+nodes = [
+  { :name => "db-lab",  :ip => "192.168.33.10" },
+  { :name => "web-lab", :ip => "192.168.33.11" },
+]
+
+Vagrant.configure("2") do |config|
+  nodes.each do |node|
+    config.vm.define node[:name] do |nconf|
+      nconf.vm.box = "nixbox/nixos"
+      nconf.vm.box_version = "23.05" # 23.11 hangs; https://github.com/NixOS/nixpkgs/issues/262686
+      nconf.vm.box_check_update = false
+
+      nconf.vm.hostname = node[:name]
+      nconf.vm.network "private_network", type: "static", ip: node[:ip]
+      nconf.vm.synced_folder ".", "/vagrant", disabled: true
+
+      nconf.vm.provision "shell" do |s|
+        ssh_pub_key = File.readlines("#{ENV['HOME']}/.ssh/id_ed25519.pub").first.strip
+        s.inline = <<-SHELL
+          mkdir --mode=0700 /root/.ssh
+          echo #{ssh_pub_key} >> /root/.ssh/authorized_keys
+        SHELL
+      end
+
+      # Activate hostname, network config.
+      nconf.vm.provision "shell", inline: "nixos-rebuild boot 2>&1 | tee /tmp/build.log", reboot: true
+
+      nconf.vm.provider "libvirt" do |libvirt|
+        libvirt.driver = "kvm"
+        libvirt.cpus = 2
+        libvirt.cputopology :sockets => '1', :cores => '2', :threads => '1'
+        libvirt.memory = 1024 # nixos-rebuild silently fails with 512
+      end
+    end
+  end
+end

examples/vagrant-demo/flake.nix

@@ -0,0 +1,64 @@
+{
+  description = "labcoat vagrant-demo system flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.05";
+  };
+
+  outputs = { nixpkgs, ... }:
+    let
+      inherit (nixpkgs) lib;
+    in
+    {
+      nixosConfigurations =
+        let
+          # Configuration shared by all systems.
+          commonModule = {
+            boot.loader.grub.enable = true;
+            boot.loader.grub.device = "/dev/vda";
+
+            boot.initrd.checkJournalingFS = false;
+
+            services.openssh = {
+              enable = true;
+              settings.PermitRootLogin = "yes";
+            };
+
+            system.stateVersion = "24.05";
+          };
+
+          # Creates a network module based on provided config.
+          networkModule = { hostName, ipAddr }: {
+            _module.args.deployAddr = ipAddr; # See labcoat deploy-host-attr config.
+            networking = {
+              inherit hostName;
+              interfaces = {
+                ens6.ipv4.addresses = [{
+                  address = ipAddr;
+                  prefixLength = 24;
+                }];
+              };
+            };
+          };
+        in
+        {
+          db-lab = lib.nixosSystem {
+            system = "x86_64-linux";
+            modules = [
+              commonModule
+              ./hardware-configuration.nix
+              (networkModule { hostName = "db-lab"; ipAddr = "192.168.33.10"; })
+            ];
+          };
+
+          web-lab = lib.nixosSystem {
+            system = "x86_64-linux";
+            modules = [
+              commonModule
+              ./hardware-configuration.nix
+              (networkModule { hostName = "web-lab"; ipAddr = "192.168.33.11"; })
+            ];
+          };
+        };
+    };
+}

examples/vagrant-demo/hardware-configuration.nix

@@ -0,0 +1,28 @@
+# Vagrant + kvm hardware config.
+{ lib, modulesPath, ... }:
+{
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ata_piix" "virtio_pci" "virtio_scsi" "floppy" "sd_mod" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/f101d11d-cf4b-4705-96ee-bf21580ee386";
+      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.ens4.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+}

examples/vagrant-demo/xdg-config/labcoat/config.toml

@@ -0,0 +1,3 @@
+# Host deployment configuration. Nix attrs typically start with 'flake' or 'target'.
+[hosts]
+deploy-host-attr = 'target._module.args.deployAddr'