Since you're thinking of looking at my script, here's a cleaned up
version. It makes it a little more obvious where to put one's
commands.
I call it "watch_usb_audio".
Code:
--------------------
#!/bin/sh
exec >/home/tc/watch_usb_audio.log 2>&1
audiodev=$1
usage()
{
cat <<EOF >&2
usage: $0 audio-device-name
The only argument to this script should be your USB audio device
name, as seen in /proc/asound. On my machine my Harman Kardon
Soundsticks show up as "Soundsticks":
$ ls -F /proc/asound
Headphones@ card1/ hwdep pcm version
SoundSticks@ cards modules seq/
card0/ devices oss/ timers
EOF
exit 1
}
if [ ! "$audiodev" ]
then
usage
fi
log()
{
echo $(date +%Y-%m/%d-%X) "$@"
}
device_present()
{
test -e /proc/asound/$audiodev
}
wait_for_device()
{
while ! device_present
do
sleep 4
done
}
wait_for_device_to_go_away()
{
while device_present
do
sleep 4
done
}
watch_usb_audio()
{
while : loop forever
do
wait_for_device
log $audiodev is now present
# commands to run when the device is plugged in go here
alsactl restore
/usr/local/etc/init.d/squeezelite restart
wait_for_device_to_go_away
log $audiodev has vanished
# commands to run when the device is plugged in go here
done
}
log "Watching for USB device '$audiodev'"
if ! device_present
then
log Device not present at startup. Will wait...
fi
watch_usb_audio &
--------------------
------------------------------------------------------------------------
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