Add ttyusbhandler to source tree

setup/ttyusbhandler.txt

@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# called by udev as:
+# ttyusbhandler [add|remove] ttyUSBname
+
+# depending on what port ttyUSB adapter was added or removed from,
+# automatically launches or kills ADTPro as needed
+# restarts getty as needed
+
+# remove:
+# kill any ADTPro for this port
+# if a getty is on this port, do nothing here, it will be killed and respawn
+#   iteself
+
+# add:
+# stagger adds by port number to prevent problems during simultaneous add at startup
+# if lower port, solo adapter on lower port USB hub, or lower port of any USB hub,
+#   kill any ADTPro, rescan for getty if sleeping, and launch adtPro
+# if upper port, solo adapter on upper port USB hub, or higher port of any USB hub,
+#   rescan for getty
+
+if [[ $1 == "remove" ]]; then
+    rm /tmp/udev-$2-removed &> /dev/null
+    touch /tmp/udev-$2-removed
+    pkill -f "$2.*ADTPro"
+elif [[ $1 == "add" ]]; then
+    [[ $2 == "ttyUSBlower" ]] && sleep 1.5
+    [[ ${#2} -gt 11 ]] && sleep "${2:15:2}"
+    if [[ $2 == "ttyUSBlower" || \
+          $2 == $(ls -1 /dev/ttyUSBlower_hub* 2> /dev/null | head -1 | cut -c 6-) || \
+          ( ${2:0:12} == "ttyUSBlower_" && $2 != $(ls -1 /dev/ttyUSBupper_hub* 2> /dev/null | tail -1 | cut -c 6-) ) \
+       ]]; then
+        rm /tmp/udev-ttyUSBlower-added &> /dev/null
+        touch /tmp/udev-ttyUSBlower-added
+        pkill -f "[A]DTPro"
+        pkill -f "[u]sbgetty"
+        exec /usr/local/adtpro/adtpro.sh headless serial
+    else # ttyUSBupper
+        rm /tmp/udev-ttyUSBupper-added &> /dev/null
+        touch /tmp/udev-ttyUSBupper-added
+        pkill -f "[g]etty.*ttyUSB"
+    fi
+else
+    exit 2
+fi