#!/bin/bash
#
# This script is started in the background from solidoodle-udev. It is safe
# in here to now do long term operations, UDEV isn't waiting on this.
#
# Two arguments are passed in, the first is the ACTION environment variable
# from the UDEV script, the second is the DEVNAME environment variable.
#
export ACTION="$1"
export DEVNAME="$2"

# The ever helpful systemd will seek out and destroy any udev cgroup
# tasks that hang around too long for it, so we need this perfectly
# obvious line to make this a user cgroup task instead of a udev one.

echo $$ > /sys/fs/cgroup/systemd/user.slice/tasks

# The device isn't really there till a little time has passed, so wait
# a bit.

sleep 2

#
# First trick - these scripts are intended to do funny things when I plug in
# my solidoodle, but if I have my AVRISP mkII programmer plugged in, then it
# is the one that wants to do funny things, so if lsusb says I have the ISP
# plugged in, exit right away.
#
avrisp=`lsusb | fgrep 'ID 03eb:2104 Atmel Corp. AVR ISP mkII' | wc -l`
if [ "$avrisp" -ge 1 ]
then
   exit
fi
if [ "$ACTION" = "add" ]
then

   # Now find out if $DEVNAME is really a solidoodle by sending a gcode
   # command to query the device and see if it responds with a string that
   # says solidoodle somewhere.

   solid=`/usr/local/bin/send-this "$DEVNAME" M115 2>/dev/null | \
          fgrep -i solidoodle | wc -l`
   if [ "$solid" -ge 1 ]
   then

      # Looks like it really is a solidoodle. Make a symlink for this
      # device named /dev/solidoodle so we don't have to worry about
      # plugging in multiple different ACM devices in random orders
      # screwing up our printer config info.

      rm -f /dev/solidoodle
      ln -s $DEVNAME /dev/solidoodle
      su -l tom /bin/bash -c \
         "/usr/local/bin/bg-dammit /bin/bash /home/tom/scripts/solidoodle-on"
   fi
   exit
fi
if [ "$ACTION" = "remove" ]
then

   # If /dev/solidoodle is a symlink to $DEVNAME, then remove the symlink.

   solid=`readlink /dev/solidoodle 2>/dev/null`
   if [ "$solid" = "$DEVNAME" ]
   then
      rm -f /dev/solidoodle
      su -l tom /bin/bash -c \
         "/usr/local/bin/bg-dammit /bin/bash /home/tom/scripts/solidoodle-off"
   fi
   exit
fi