nixos/amazon-option: Tolerate harmless ec2.hvm for compatibility

Throwing an error necessitates changes in NixOps that are not safe yet.

1 files changed, 6 insertions, 3 deletions

diff --git a/nixos/modules/virtualisation/amazon-options.nix b/nixos/modules/virtualisation/amazon-options.nix
index 915bbf9763db..926fe43b0ffe 100644
--- a/nixos/modules/virtualisation/amazon-options.nix
+++ b/nixos/modules/virtualisation/amazon-options.nix
@@ -2,9 +2,6 @@
 let
   inherit (lib) literalExpression types;
 in {
-  imports = [
-    (lib.mkRemovedOptionModule [ "ec2" "hvm" ] "Only HVM instances are supported, so specifying it is no longer necessary.")
-  ];
   options = {
     ec2 = {
       zfs = {
@@ -52,6 +49,12 @@ in {
           Whether the EC2 instance is using EFI.
         '';
       };
+      hvm = lib.mkOption {
+        description = "Unused legacy option. While support for non-hvm has been dropped, we keep this option around so that NixOps remains compatible with a somewhat recent `nixpkgs` and machines with an old `stateVersion`.";
+        internal = true;
+        default = true;
+        readOnly = true;
+      };
     };
   };