[libvirt] [PATCH] LXC: don't doubly link /dev/console

[Daniel P. Berrange]

On Mon, May 05, 2014 at 11:14:18AM -0400, Dwight Engen wrote:
> When a console is configured, /dev/console and /dev/tty1 are created as
> symlinks to the same underlying pts. This causes problems since a
> separate getty will be spawned for /dev/console and /dev/tty1, but they
> are each controlling the same device.

That is simply a bug in the OS setup IMHO.

FYI systemd specified that the 'container_ttys' env variable should
be set to indicate which devices a gettty should be spawned on and
libvirt now sets that. We intentionally exclude tty1 from the
container_ttys env var so we don't get the double-getty with any
systemd enabled OS.

IMHO even non-systemd OS could read that env var to decide where
to spawn getttys

See also this doc:

  http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/

> This patch makes it so that /dev/console is the sole symlink to the first
> console, /dev/tty1 to the second, /dev/tty2 to the third and so on.

This is a backwards-incompatible change that is likely to break
existing deployments I'm afraid, so we can't do that IMHO.

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|