adding firmware update script from pkg installer

doc/firmware-upgrade-script.sh

@@ -0,0 +1,68 @@
+#!/bin/sh
+# this is run from /tmp by the HDHomerun installer
+cd "${0%/[^/]*}"
+reset
+
+export PATH=.:/usr/local/bin:$PATH
+
+probe_devices() {
+	echo "Probing for devices:"
+	DEVICES=($(hdhomerun_config discover -4 --dedupe | awk '/^hdhomerun device/ { print $6; }'))
+	show_devices
+}
+
+show_devices() {
+	for (( i=0; i<${#DEVICES[*]}; i++ )); do {
+                DEVICEID[$i]=$(hdhomerun_config discover "${DEVICES[$i]}" | awk '/^hdhomerun device/ { print $3; }')
+		VERSIONS[$i]=$(hdhomerun_config "${DEVICES[$i]}" get /sys/version)
+		  MODELS[$i]=$(hdhomerun_config "${DEVICES[$i]}" get /sys/model || echo hdhomerun_atsc)
+		echo "${i}: ${DEVICEID[$i]} firmware ${VERSIONS[$i]}"
+	}; done
+
+	echo "${#DEVICES[*]} device(s) found"
+	echo ""
+
+	[[ ${#DEVICES[*]} -eq 0 ]] && {
+		echo "No HDHomeRun devices detected on your network."
+		echo "Please check the network configuration and try again."
+		echo ""
+		exit 0
+	}
+}
+
+upgrade() {
+	for (( i=0; i<${#DEVICES[*]}; i++ )); do {
+		local firmware=$(ls -1 "${MODELS[$i]}"_firmware_*.bin 2>/dev/null | sort -n | tail -n 1)
+		local fwver=$(echo "${firmware}" | sed "s/${MODELS[$i]}_firmware_\(.*\)\.bin/\1/")
+
+		[[ -z "${fwver}" ]] && {
+			echo "${DEVICEID[$i]}(${MODELS[$i]}) no firmware upgrade found"
+			continue
+		}
+
+		[[ ( "${fwver}" == "${VERSIONS[$i]}" ) || ( "${fwver}" < "${VERSIONS[$i]}" ) ]] && {
+			echo "${DEVICEID[$i]}(${MODELS[$i]}) is already running the latest firmware"
+			continue
+		}
+
+		echo "${DEVICEID[$i]}(${MODELS[$i]}) => $fwver"
+		hdhomerun_config "${DEVICES[$i]}" upgrade "${firmware}"
+		echo ""
+	}; done
+
+	sleep 5
+
+	echo ""
+	echo "Upgrade results:"
+	show_devices
+}
+
+probe_devices
+upgrade
+
+echo "Finished."
+echo "The HDHomeRun application can be found in your Applications folder"
+echo "(You can close this window now)"
+echo ""
+
+exit 0