incus: Custom images (#78)

configurations/nixos/hello/default.nix

@@ -0,0 +1,19 @@
+{ flake, pkgs, ... }:
+
+let
+  inherit (flake) inputs;
+  inherit (inputs) self;
+in
+{
+  nixos-unified.sshTarget = "srid@hello";
+
+  imports = [
+    ../public-vm/configuration.nix
+  ];
+
+  networking.hostName = "hello";
+
+  environment.systemPackages = with pkgs; [
+    neovim
+  ];
+}

configurations/nixos/public-vm/configuration.nix

@@ -0,0 +1,27 @@
+{ flake, pkgs, ... }:
+
+let
+  inherit (flake) inputs;
+  inherit (inputs) self;
+in
+{
+  imports = [
+    "${inputs.nixpkgs}/nixos/modules/virtualisation/lxd-virtual-machine.nix"
+    (self + /modules/nixos/shared/primary-as-admin.nix)
+  ];
+
+  nixpkgs.hostPlatform = "x86_64-linux";
+  services.openssh = {
+    enable = true;
+    settings.PasswordAuthentication = false;
+  };
+  networking.firewall = {
+    enable = true;
+    allowedTCPPorts = [ 22 ];
+  };
+
+  # Workaround the annoying `Failed to start Network Manager Wait Online` error on switch.
+  # https://github.com/NixOS/nixpkgs/issues/180175
+  systemd.services.NetworkManager-wait-online.enable = false;
+  system.stateVersion = "24.11";
+}

configurations/nixos/public-vm/default.nix

@@ -0,0 +1,19 @@
+{ pkgs, ... }:
+{
+  imports = [
+    ./configuration.nix
+  ];
+
+
+  # Hello world service
+  services.nginx = {
+    enable = true;
+    # Return "Hello World" on / request
+    virtualHosts."_" = {
+      root = "${pkgs.writeTextDir "index.html" "Hello World"}";
+    };
+  };
+  networking.firewall = {
+    allowedTCPPorts = [ 80 ];
+  };
+}

modules/flake-parts/incus-image.nix

@@ -0,0 +1,18 @@
+{ inputs, ... }: {
+  perSystem = { pkgs, ... }: {
+    apps.incus-image-import.program = pkgs.writeShellApplication {
+      name = "incus-image-import";
+      text = ''
+        NAME=$1
+
+        echo "Building image ... "
+        METADATA=$(nix build --no-link --print-out-paths ${inputs.self}#nixosConfigurations."$NAME".config.system.build.metadata)/tarball/
+        IMG=$(nix build --no-link --print-out-paths ${inputs.self}#nixosConfigurations."$NAME".config.system.build.qemuImage)/nixos.qcow2
+
+        echo "Importing ... "
+        set -x
+        sudo incus image import --alias srid/"$NAME" "$METADATA"/*.tar.xz "$IMG"
+      '';
+    };
+  };
+}