compose: WIP

examples/compose.nix

@@ -5,10 +5,15 @@ let
 
 in
 microvm.lib.compose.evalModules {
-  modules = [ {
-    microvm.vms.foo.config = {
+  modules = builtins.genList (n: {
+    microvm.vms."qemu${toString n}".config = {
+      microvm.hypervisor = "qemu";
     };
-    microvm.vms.bar.config = {
-    };
-  } ];
+    # microvm.vms."chv${toString n}".config = {
+    #   microvm.hypervisor = "cloud-hypervisor";
+    # };
+    # microvm.vms."firecracker${toString n}".config = {
+    #   microvm.hypervisor = "firecracker";
+    # };
+  }) 1;
 }

lib/compose/modules/base.nix

@@ -9,6 +9,4 @@ in
     # system.build
     (nixosModulesPath + "/system/build.nix")
   ];
-
-  nixpkgs = nixpkgs;
 }

lib/compose/modules/process-compose.nix

@@ -1,13 +1,22 @@
-{ config, pkgs, ... }:
+{ config, lib, pkgs, ... }:
 
 {
   system.build = {
     process-compose-workflow = {
       version = "1.34";
+      is_strict = true;
 
-      processes = builtins.mapAttrs (name: runner: {
-        command = "${runner}/bin/microvm-run";
-      }) config.system.microvmRunners;
+      processes = lib.concatMapAttrs (name: config:
+        let
+          inherit (config.networking) hostName;
+          mainName = "${config.microvm.hypervisor}-${hostName}";
+        in {
+          ${mainName} = {
+            command = "${config.microvm.declaredRunner}/bin/microvm-run";
+            is_tty = true;
+            namespace = hostName;
+          };
+      }) config.system.microvmConfigs;
     };
 
     process-compose-file = pkgs.writers.writeYAML "process-compose.yaml"

lib/compose/modules/vms.nix

@@ -5,18 +5,14 @@ let
     microvm = {
       shares = [ {
         proto = "9p";
-        tag = "store";
+        tag = "nix-store";
         source = "/nix/store";
         mountPoint = "/nix/store";
       } ];
+      socket = "control-${config.networking.hostName}.socket";
     };
   };
 
-  # Configuration that depends on config at extendModules-time.
-  extensionConfig = { config, ... }: {
-    microvm.socket = "control-${config.networking.hostName}.socket";
-  };
-
   # A base system that is fully evaluated once, and reused with extendModules per VM.
   baseSystem = lib.nixosSystem {
     # TODO: option
@@ -39,28 +35,14 @@ in
     internal = true;
   };
 
-  options.system.microvmRunners = with lib; mkOption {
-    type = with types; attrsOf package;
-    default = {};
-    description = ''
-      Generated `microvm.declaredRunner`
-    '';
-    internal = true;
-  };
-
   config.system = {
     microvmConfigs = builtins.mapAttrs (name: { config, ... }:
       (baseSystem.extendModules {
         modules = [
+          { networking.hostName = name; }
           config
-          extensionConfig
         ];
       }).config
     ) config.microvm.vms;
-
-    microvmRunners = builtins.mapAttrs (name: config:
-      builtins.trace "runner: ${name}"
-      config.microvm.declaredRunner
-    ) config.system.microvmConfigs;
   };
 }