nixos/test-driver: exit early if /dev/vhost-vsock isn't available (#406455) (cd79d418) · Commits · nix / nixpkgs

nixos/doc/manual/development/running-nixos-tests-interactively.section.md

+10 −1

Original line number	Diff line number	Diff line
		@@ -71,10 +71,19 @@ An SSH-based backdoor to log into machines can be enabled with
		{
		name = "…";
		nodes.machines = { /* … */ };
		sshBackdoor.enable = true;
		interactive.sshBackdoor.enable = true;
		}
		```

		::: {.warning}
		Make sure to only enable the backdoor for interactive tests
		(i.e. by using `interactive.sshBackdoor.enable`)! This is the only
		supported configuration.

		Running a test in a sandbox with this will fail because `/dev/vhost-vsock` isn't available
		in the sandbox.
		:::

		This creates a [vsock socket](https://man7.org/linux/man-pages/man7/vsock.7.html)
		for each VM to log in with SSH. This configures root login with an empty password.

+18 −15

Original line number	Diff line number	Diff line
		@@ -43,7 +43,10 @@ in
		};

		config = {
		rawTestDerivation = hostPkgs.stdenv.mkDerivation {
		rawTestDerivation =
		assert lib.assertMsg (!config.sshBackdoor.enable)
		"The SSH backdoor is currently not supported for non-interactive testing! Please make sure to only set `interactive.sshBackdoor.enable = true;`!";
		hostPkgs.stdenv.mkDerivation {
		name = "vm-test-run-${config.name}";

		requiredSystemFeatures =