tty mode login for clusters (a la Ctrl-P)

[geofft]

It would eventually be nice to provide a TTY login mode, both because it's probably faster than an X login, and in case your X session or the system's X config is broken.

This should be easy by adding a GDM custom command to essentially openvt schroot -c login getty.

[jdreed]

IIRC, back in the day, we decided that we didn't really want ^{P anymore, and GDM custom commands are harder now (and we don't need yet another gdm login applet).}

I've committed a change to debathena-xsession which does the following:

• Creates a new session called "Athena TTY Mode" (the name is negotiable)
• Add /etc/X11/Xsession.d/00debathena-gdm-sucks, which checks for that session type, kills pulseaudio if you're over quota, runs xterm -ls (so you get the Athena tty login sequence), and then exits.

Note that if we change the session name, we need to change it in the message text in 01debathena-quota (see #600)

[jdreed]

See also #715.

This ticket is for actual tty login on a VT.

[jdreed]

I'm tempted to wontfix this unless someone can explain to me why this is needed in addition to the existing TTY login. It won't be faster, and if X config is broken, you can't see the login screen to begin with. And anything that's not a GDM session is Effort.

I'll reconsider it if we give up on upstream and bring back dm/xlogin.

[jdreed]

So, if we go the openvt route, then we have yet another VT open, and yet another state a machine could be in. There's also the potential for abuse, which is why we disable the VTs.