[systemd-devel] getty : how to run getty on every ttyX

[Daniel P. Berrange]

On Fri, Dec 13, 2013 at 04:15:33PM +0100, Lennart Poettering wrote:
> On Fri, 13.12.13 15:12, Daniel P. Berrange (berrange at redhat.com) wrote:
> 
> > > /dev/tty1, /dev/tty2, ... make no sense in containers as there is no
> > > virtual console. 
> > 
> > For each <console> device that you list in the container configuration
> > with libvirt, it will allocate a /dev/pts/NNN device, and add a symlink
> > from /dev/ttyN to the /dev/pts/NNN slave.  What we'd like is for guest
> > OS to be able to setup  agetty processes on any <console> device libvirt
> > has configured for the container automatically.
> 
> Humm, I'd prefer if you wouldn't create such symlinks, as it suggests
> those devices would actually be full VT devices, but they aren't, they
> speak a different $TERM and have no matching /dev/vcsa stuff and don't
> speak the ioctls....

Basically I agree, but libvirt has to figure out its back-compat
story here so we don't break existing deployments of libvirt
containers which might be relying this. Now that I remember,
figuring out the backcompat story is in fact what stopped me
implementing the better idea so far....

> > We had discussed this back at Linux Plumbers last year, and at the time
> > you had suggested that rather than create /dev/ttyN symlinks we should
> > instead do something like  /dev/containerttyN instead, and set a
> > 'container_tty' variable containing a list of all those device names
> > so that systemd can discover them sensibly. We never got around to
> > doing this from the libvirt side, and AFAIK systemd hasn't done anything
> > on its side either. So is this still a suitable way forward ?
> 
> Yeah, I am pretty sure that's what we should do. I figure I should hack
> that up. I'll work on it now.

Daniel
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