[nix] mv buildVM to host_builder

machines/modules/host_builder.nix

@@ -3,11 +3,12 @@
 , nixpkgs
 , sops-nix
 , inputs
-, nixos-hardware
+, hosts
-, home-manager
 , ...
 }:
-
+let
+  pkgs = nixpkgs.legacyPackages."x86_64-linux";
+in
 rec {
   nixosSystem = nixpkgs.lib.makeOverridable nixpkgs.lib.nixosSystem;
   nixosSystemUnstable = nixpkgs-unstable.lib.makeOverridable nixpkgs-unstable.lib.nixosSystem;
@@ -43,7 +44,6 @@ rec {
   defaultModules = baseModules;
 
   makeMicroVM = hostName: ipv4Addr: macAddr: modules: [
-    inputs.microvm.nixosModules.microvm
     {
       microvm = {
         hypervisor = "cloud-hypervisor";
@@ -97,14 +97,146 @@ rec {
 
   inputsMod = inputs // { malobeo = self; };
 
+
+    vmMicroVMOverwrites = hostname: options: {
+      microvm = rec {
+        mem = pkgs.lib.mkForce 4096;
+        hypervisor = pkgs.lib.mkForce "qemu";
+        socket = pkgs.lib.mkForce null;
+
+
+        #needed for hosts that deploy imperative microvms (for example fanny)
+        writableStoreOverlay = pkgs.lib.mkIf options.writableStore "/nix/.rw-store";
+        volumes = pkgs.lib.mkIf options.writableStore [ {
+          image = "nix-store-overlay.img";
+          mountPoint = writableStoreOverlay;
+          size = 2048;
+        } ];
+
+        shares = pkgs.lib.mkForce (pkgs.lib.optionals (!options.writableStore) [
+          {
+            tag = "ro-store";
+            source = "/nix/store";
+            mountPoint = "/nix/.ro-store";
+          }
+        ] ++ pkgs.lib.optionals (options.varPath != "") [
+          {
+            source = "${options.varPath}";
+            securityModel = "mapped";
+            mountPoint = "/var";
+            tag = "var";
+          }
+        ]);
+
+        interfaces = pkgs.lib.mkIf (!options.withNetworking) (pkgs.lib.mkForce [{
+          type = "user";
+          id = "eth0";
+          mac = "02:23:de:ad:be:ef";
+        }]);
+
+        #if networking is disabled forward port 80 to still have access to webservices
+        forwardPorts = pkgs.lib.mkIf (!options.withNetworking) (pkgs.lib.mkForce [
+          { from = "host"; host.port = 8080; guest.port = 80; }
+        ]);
+
+      };
+
+      fileSystems = {
+        "/".fsType = pkgs.lib.mkForce "tmpfs";
+
+        # prometheus uses a memory mapped file which doesnt seem supported by 9p shares
+        # therefore we mount a tmpfs inside the datadir
+        "/var/lib/prometheus2/data" = pkgs.lib.mkIf (hostname == "overwatch" && options.varPath != "") (pkgs.lib.mkForce {
+          fsType = pkgs.lib.mkForce "tmpfs";
+        });
+      };
+
+      boot.isContainer = pkgs.lib.mkForce false;
+      services.timesyncd.enable = false;
+      users.users.root.password = "";
+      services.getty.helpLine = ''
+        Log in as "root" with an empty password.
+        Use "reboot" to shut qemu down.
+      '';
+    };
+
+    vmDiskoOverwrites = {
+      boot.initrd = {
+        secrets = pkgs.lib.mkForce {};
+        network.ssh.enable = pkgs.lib.mkForce false;
+      };
+
+      malobeo.disks.enable = pkgs.lib.mkForce false;
+      networking.hostId = "a3c3101f";
+    };
+
+    vmSopsOverwrites = host: {
+      sops.defaultSopsFile = pkgs.lib.mkForce ../${host}/dummy.yaml;
+
+      environment.etc = {
+        devHostKey = {
+          source = ../secrets/devkey_ed25519;
+          mode = "0600";
+        };
+      };
+
+      services.openssh.hostKeys = [{
+        path = "/etc/devHostKey";
+        type = "ed25519";
+      }];
+    };
+
+    vmNestedMicroVMOverwrites = host: sopsDummy: {
+
+      services.malobeo.microvm.deployHosts = pkgs.lib.mkForce [];
+      microvm.vms = 
+      let
+        # Map the values to each hostname to then generate an Attrset using listToAttrs
+        mapperFunc = name: { inherit name; value = {
+          specialArgs.inputs = inputsMod;
+          specialArgs.self = self;
+          config = {
+            imports = (makeMicroVM "${name}" 
+                                   "${hosts.malobeo.hosts.${name}.network.address}"
+                                   "${hosts.malobeo.hosts.${name}.network.mac}" [
+              ../${name}/configuration.nix     
+              (vmMicroVMOverwrites name { 
+                withNetworking = true; 
+                varPath = ""; 
+                writableStore = false; })
+              (if sopsDummy then (vmSopsOverwrites name) else {})
+            ]);
+          };
+        }; };
+      in
+      builtins.listToAttrs (map mapperFunc self.nixosConfigurations.${host}.config.services.malobeo.microvm.deployHosts);
+    };
+
+    buildVM = host: networking: sopsDummy: disableDisko: varPath: writableStore: (self.nixosConfigurations.${host}.extendModules {
+        modules = [
+            (vmMicroVMOverwrites host { 
+              withNetworking = networking; 
+              varPath = "${varPath}"; 
+              writableStore = writableStore; })
+            (if sopsDummy then (vmSopsOverwrites host) else {})
+            (if disableDisko then vmDiskoOverwrites else {})
+          ] ++ pkgs.lib.optionals (hosts.malobeo.hosts.${host}.type != "microvm") [
+            inputs.microvm.nixosModules.microvm
+          ] ++ pkgs.lib.optionals (self.nixosConfigurations.${host}.config ? services.malobeo.microvm.deployHosts) [
+            (vmNestedMicroVMOverwrites host sopsDummy)
+        ];
+      });
+
   buildHost = hosts: (builtins.mapAttrs (host: settings: nixosSystem {
     system = if (settings.type == "rpi") then "aarch64-linux" else "x86_64-linux";
     specialArgs.inputs = inputsMod;
+    specialArgs.self = self;
     modules = (if (settings.type != "microvm") then
       defaultModules ++ [ ../${host}/configuration.nix ]
       else
       makeMicroVM "${host}" "${settings.network.address}" "${settings.network.mac}" [
-        ./${host}/configuration.nix
+        inputs.microvm.nixosModules.microvm
+        ../${host}/configuration.nix
       ]);
   }) hosts);
 }

outputs.nix

@@ -15,7 +15,8 @@ in (utils.lib.eachSystem (builtins.filter filter_system utils.lib.defaultSystems
     pkgs-unstable = nixpkgs-unstable.legacyPackages."${system}";
     pkgs = nixpkgs.legacyPackages."${system}";
 
-    utils = import ./machines/modules/host_builder.nix ( inputs // { inherit inputs; self = self; });
+    hosts = import ./machines/hosts.nix ( inputs // { inherit inputs; self = self; });
+    utils = import ./machines/modules/host_builder.nix ( inputs // { inherit inputs; self = self; hosts = hosts; });
   in
   {
     devShells.default =
@@ -156,8 +157,8 @@ in (utils.lib.eachSystem (builtins.filter filter_system utils.lib.defaultSystems
 
   })) // (
   let
-    utils = import ./machines/modules/host_builder.nix ( inputs // { inherit inputs; self = self; });
     hosts = import ./machines/hosts.nix ( inputs // { inherit inputs; self = self; });
+    utils = import ./machines/modules/host_builder.nix ( inputs // { inherit inputs; self = self; hosts = hosts; });
   in
   {
     nixosConfigurations = utils.buildHost hosts.malobeo.hosts;