Add common directory

Signed-off-by: Valentin Kharin <[email protected]>

modules/microvm/virtualization/microvm/appvm.nix

@@ -34,6 +34,7 @@ let
           })
 
           ./common/storagevm.nix
+          (lib.optionalAttrs config.ghaf.virtualization.microvm-host.sharedVmDirectory.enable ./common/common-directory.nix)
 
           # To push logs to central location
           ../../../common/logging/client.nix

modules/microvm/virtualization/microvm/common/common-directory.nix

@@ -0,0 +1,35 @@
+# Copyright 2022-2024 TII (SSRC) and the Ghaf contributors
+# SPDX-License-Identifier: Apache-2.0
+{ lib, config, ... }:
+let
+  cfg = config.ghaf.storagevm;
+  common-mountPath = "/tmp/common";
+in
+{
+  config = lib.mkIf cfg.enable {
+    fileSystems.${common-mountPath}.neededForBoot = true;
+
+    microvm.shares = [
+      {
+        tag = "common-directory-share";
+        proto = "virtiofs";
+        securityModel = "passthrough";
+        source = "/storagevm/common";
+        mountPoint = common-mountPath;
+      }
+    ];
+
+    environment.persistence.${common-mountPath} = {
+      hideMounts = true;
+
+      directories = [
+        {
+          directory = "/home/${config.ghaf.users.accounts.user}/common";
+          inherit (config.ghaf.users.accounts) user;
+          group = config.ghaf.users.accounts.user;
+          mode = "u=rwx,g=,o=";
+        }
+      ];
+    };
+  };
+}

modules/microvm/virtualization/microvm/guivm.nix

@@ -26,6 +26,7 @@ let
       })
 
       ./common/storagevm.nix
+      (lib.optionalAttrs config.ghaf.virtualization.microvm-host.sharedVmDirectory.enable ./common/common-directory.nix)
 
       # To push logs to central location
       ../../../common/logging/client.nix

modules/microvm/virtualization/microvm/microvm-host.nix

@@ -18,6 +18,9 @@ in
   options.ghaf.virtualization.microvm-host = {
     enable = lib.mkEnableOption "MicroVM Host";
     networkSupport = lib.mkEnableOption "Network support services to run host applications.";
+    sharedVmDirectory.enable = lib.mkEnableOption "shared directory" // {
+      default = true;
+    };
   };
 
   config = lib.mkIf cfg.enable {