I want to use the following feature of Linux (which one of my virtual
machines):
> If no console device is specified, the first device found capable of
acting as a system console will be used. At this time, the system first
looks for a VGA card and then for a serial port.
From
https://github.com/torvalds/linux/blob/master/Documentation/serial-console.txt
The reason for that is in production we use the video output to interact
with the virtual machine (text only) but for testing I want to interact
programmatically with the machine using a serial port provided by
VirtualBox.
Disclaimers:
- I am aware of running virtual machines headless, but this is different
from running them without a graphics card.
- I am aware of SSH but SSH is not permitted in the VM
- I am aware of RDP but using a RDP client during testing is not possible.
- I am aware of taking screenshots of the VM and OCR them (desperate, I
know), but then I can't provide input.
- I am aware of the VirtualBox undocumented cli option: VBoxManage modifyvm
"$(VM_REL_NAME)" --graphicscontroller none but that seems not to trigger
the feature quoted above.
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