Use vfkit driver on darwin

The new experimental vfkit driver[1] uses vfkit to start virtual
machines using Apple virtualisation framework when running on Apple
silicon.

This driver is not available in minikube release yet. To use it you need
to install vfkit and build minikube from the PR.

Example run:

    % drenv start envs/example.yaml
    2024-08-16 23:31:18,271 INFO    [example] Starting environment
    2024-08-16 23:31:18,315 INFO    [ex2] Starting minikube cluster
    2024-08-16 23:31:18,320 INFO    [ex1] Starting minikube cluster
    2024-08-16 23:31:42,219 INFO    [ex2] Cluster started in 23.90 seconds
    2024-08-16 23:31:42,219 INFO    [ex2/0] Running addons/example/start
    2024-08-16 23:31:49,781 INFO    [ex2/0] addons/example/start completed in 7.56 seconds
    2024-08-16 23:31:49,781 INFO    [ex2/0] Running addons/example/test
    2024-08-16 23:31:49,917 INFO    [ex2/0] addons/example/test completed in 0.14 seconds
    2024-08-16 23:31:50,937 INFO    [ex1] Cluster started in 32.62 seconds
    2024-08-16 23:31:50,937 INFO    [ex1/0] Running addons/example/start
    2024-08-16 23:31:58,453 INFO    [ex1/0] addons/example/start completed in 7.52 seconds
    2024-08-16 23:31:58,453 INFO    [ex1/0] Running addons/example/test
    2024-08-16 23:31:58,582 INFO    [ex1/0] addons/example/test completed in 0.13 seconds
    2024-08-16 23:31:58,583 INFO    [example] Environment started in 40.31 seconds

    % minikube profile list
    |---------|-----------|------------|----------------|------|---------|---------|-------|----------------|--------------------|
    | Profile | VM Driver |  Runtime   |       IP       | Port | Version | Status  | Nodes | Active Profile | Active Kubecontext |
    |---------|-----------|------------|----------------|------|---------|---------|-------|----------------|--------------------|
    | ex1     | vfkit     | containerd | 192.168.106.24 | 8443 | v1.31.0 | Running |     1 |                | *                  |
    | ex2     | vfkit     | containerd | 192.168.106.23 | 8443 | v1.31.0 | Running |     1 |                |                    |
    |---------|-----------|------------|----------------|------|---------|---------|-------|----------------|--------------------|

Issues:

- When terminating the process group, the vfkit process is terminated,
  and the vm is stopped. This should be fixed in minikube or vfkit by
  running the vfkit process in background or as a daemon.
  Fixed in my minikube fork: https://github.com/nirs/minikube/tree/vfkit-pg

- rook does not work on arm now, likely due to
  rook/rook#14502

- We don't have arm64 images for OCM. Can be solved by enabling Rosetta
  2. This supported in vfkit but not implemented yet in the vfkit driver.

- Nested virtualization requires M3 CPU, and is not implemented yet in
  vfkit, so testing kubevirt VMs is not possible on Apple silicon.

[1] kubernetes/minikube#19423
[2] https://github.com/crc-org/vfkit

Signed-off-by: Nir Soffer <nsoffer@redhat.com>

test/drenv/__main__.py

@@ -47,6 +47,7 @@ def main():
         sys.exit(1)
     finally:
         shutdown_executors()
+        # XXX Does not work for vfkit driver
         terminate_process_group()
 
 

test/drenv/envfile.py

@@ -23,9 +23,9 @@
         SHARED_NETWORK: {"x86_64": "default"},
     },
     "darwin": {
-        VM: {"x86_64": "hyperkit"},
+        VM: {"x86_64": "hyperkit", "arm64": "vfkit"},
         CONTAINER: "podman",
-        SHARED_NETWORK: {"x86_64": ""},
+        SHARED_NETWORK: {"x86_64": "", "arm64": ""},
     },
 }