Maximilian Bosch c6978e8a58 nixos/test-driver: exit early if /dev/vhost-vsock isn't available ...

Right now it wrongly seems as if you can set
`sshBackdoor.enable = true;` for each test and not only for debugging
purposes.

This is wrong however since you'd need to pass /dev/vhost-vsock into the
sandbox for this (which is also a prerequisite for #392117).

To make that clear, two things were changed:

* add a warning to the manual to communicate this.
* exit both interactive and non-interactive driver early if
  /dev/vhost-vsock is missing and the ssh backdoor is enabled.

  If that's the case, we pass a CLI flag to the driver already in the
  interactive case. This change also sets the flag for the
  non-interactive case.

  That way we also get a better error if somebody tries to enable this
  on a system that doesn't support that.

2025-05-13 11:14:13 +02:00

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