[systemd-devel] systemd, getty and udev

[Michael Olbrich]

On Mon, Mar 21, 2011 at 08:05:44PM +0300, Andrey Borzenkov wrote:
> On Mon, Mar 21, 2011 at 6:06 PM, Michael Olbrich
> <m.olbrich at pengutronix.de> wrote:
> 
> >> The default systemd files only start getties on a handful of ttys. Since
> >> it seems impossible to distinguish between display ttys and e.g. modem
> >> ttys, one can't just simply start gettys on all tty*, thus necessiting
> >> manual addition for further ttys in the udev rules.
> >
> > hmmm, that is unfortunate. There are a lot of different names for the
> > serial ports on embedded systems. And using a serial console here is rather
> > common. Maybe the tty from /sys/class/tty/console/active can always be
> > added somehow?
> >
> 
> src/getty-generator.c:        if
> (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {

That's not what I meant. This only adds the serial tty unit. However it is
never started unless the associated device gets the udev 'systemd' tag.

I don't know much about udev syntax. Basically something like this:
SUBSYSTEM=="tty", KERNEL=="`cat /sys/class/tty/console/active`", TAG+="systemd"

Michael

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