#! /bin/bash
#
# Examine specific system host devices to identify the drives attached
#

function describe_controller () {
	local device driver modprefix serial slotname
	driver="`readlink -f \"$1/driver\"`"
	driver="`basename $driver`"
	modprefix="`cut -d: -f1 <\"$1/modalias\"`"
	echo "Controller device @ ${1##/sys/devices/} [$driver]"
	if [[ "$modprefix" == "pci" ]] ; then
		slotname="`basename \"$1\"`"
		echo -n "  `lspci -s $slotname |cut -d\  -f2-`"
		return
	fi
	if [[ "$modprefix" == "usb" ]] ; then
		if [[ -f "$1/busnum" ]] ; then
			device="`cat \"$1/busnum\"`:`cat \"$1/devnum\"`"
			serial="`cat \"$1/serial\"`"
		else
			device="`cat \"$1/../busnum\"`:`cat \"$1/../devnum\"`"
			serial="`cat \"$1/../serial\"`"
		fi
		echo "  `lsusb -s $device` {SN: $serial}"
		return
	fi
	echo -e "  `cat \"$1/modalias\"`"
}

function describe_device () {
	targ=${1%/block*/*}
	vnd="`cat $targ/vendor`"
	mdl=`cat $targ/model`
	rdev=`readlink -f "$1"`
	if [[ -d $rdev ]] ; then
		bdev="`basename $rdev`"
		sn="`sginfo -s /dev/$bdev | \
			sed -rn -e \"/Serial Number/{s%^.+' *(.+) *'.*\\\$%\\\\1%;p;q}\"`" &>/dev/null
		if [[ -n "$sn" ]] ; then
			echo -e "    $bhost: `echo /dev/$bdev $vnd $mdl {SN: $sn}`"
		else
			echo -e "    $bhost: `echo /dev/$bdev $vnd $mdl`"
		fi
	else
		echo -e "    $bhost: Unknown $rdev"
	fi
}

function check_host () {
	local found=0
	local pController=
	while read shost ; do
		host=`dirname "$shost"`
		controller=`dirname "$host"`
		bhost=`basename "$host"`
		if [[ "$controller" != "$pController" ]] ; then
			pController="$controller"
			describe_controller "$controller"
		fi
		for dev in $host/target*/*/block*/* ; do
			if [[ "${dev: -1}" == '*' ]] ; then
				echo -e "    $bhost: [Empty]"
			else
				describe_device "$dev"
			fi
		done
	done
}

find /sys/devices/ -name *scsi_host* |check_host