How to launch a daemon conditionally?

[Scott James Remnant]

On Thu, 2008-02-07 at 13:02 -0800, upstart at eehouse.org wrote:

> I want to modify /etc/event.d/ttyS2 to not launch getty when
> /dev/ttyS2 is not present.
> 
You could do it as a single script:

	start on runlevel 2
	stop on runlevel [!2]

	pre-start exec [ -e /dev/ttyS2 ] || stop

	exec /sbin/getty -L ttyS2 115200 vt100
	respawn

But that still at least attempts to start it.

The "correct" way (which is still being worked on):

	while tty-present
	exec /sbin/getty -L $TTY 115200 vt100

(tty-present being defined as:
	from tty-added
	until tty-removed $TTY)

Scott
-- 
Have you ever, ever felt like this?
Had strange things happen?  Are you going round the twist?
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