From 4009f60d0ba7efec0200b1d5f7311693c008c172 Mon Sep 17 00:00:00 2001
From: Robert Kovacsics <robert.kovacsics@cambridgeconsultants.com>
Date: Thu, 13 Oct 2022 17:01:12 +0100
Subject: [PATCH] nixos/virtualbox-image: Allow running extra commands after
 OVA creation

This is useful as virtual machines can often be large files so not
having duplicates/work files in /nix/store can save a lot of space.
---
 .../virtualisation/virtualbox-image.nix        | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/nixos/modules/virtualisation/virtualbox-image.nix b/nixos/modules/virtualisation/virtualbox-image.nix
index 2ea23d958cf7..407d690e32e5 100644
--- a/nixos/modules/virtualisation/virtualbox-image.nix
+++ b/nixos/modules/virtualisation/virtualbox-image.nix
@@ -107,6 +107,23 @@ in {
           };
         });
       };
+      postExportCommands = mkOption {
+        type = types.lines;
+        default = "";
+        example = ''
+          ${pkgs.cot}/bin/cot edit-hardware "$fn" \
+            -v vmx-14 \
+            --nics 2 \
+            --nic-types VMXNET3 \
+            --nic-names 'Nic name' \
+            --nic-networks 'Nic match' \
+            --network-descriptions 'Nic description' \
+            --scsi-subtypes VirtualSCSI
+        '';
+        description = lib.mdDoc ''
+          Extra commands to run after exporting the OVA to `$fn`.
+        '';
+      };
     };
   };
 
@@ -179,6 +196,7 @@ in {
           mkdir -p $out
           fn="$out/${cfg.vmFileName}"
           VBoxManage export "$vmName" --output "$fn" --options manifest ${escapeShellArgs cfg.exportParams}
+          ${cfg.postExportCommands}
 
           rm -v $diskImage