[Nix-dev] boot problem: stage1 repair console doesn't work under VirtualBox

[Sergey Mironov]

Hi! Looks like stage1 repair console can't read user input, at least
under VirtualBox. Here is how to reproduce the problem:
1. Boot VirtualBox with NixOS minimal installation CD attached
2. Press 'e' in the grub to edit kernel command line
3. Add bood.debug1 kernel argument
4. Boot

Repair console appears but It doesn't react on key presses. It feels
like /dev/tty1 hangs while trying to read something (bash 'read'
operator). Note that system doesn't hang in general, other processes
continue to work  (I have carried out some experiments with inserting
"( while true ; do echo -n . ; sleep 1; done) &" into stage-1 script)

Any ideas on how to fix it?

Regards,
Sergey