scripts/qemu-testlib: Add more debugging information

This extra information should allow better forensics if the sanity tests
fail as they're currently doing occasionaly on the autobuilder for unknown
reasons.

The patch also tightens up certain checks to remove pointless noise and
error output from the logs.

(From OE-Core rev: f9970aa0a44aca8ffe6c7a6a3261887fb0db38d2)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/qemuimage-testlib

@@ -69,7 +69,7 @@ Test_Update_IPSAVE()
 	local pid=$1
 	local ip_addr=$2
 
-	if [ "$TEST_SERIALIZE" -eq 1 ]; then
+	if [ "$TEST_SERIALIZE" -eq 1 -a "$pid" != "0" -a "$pid" != "" -a "$ip_addr" != "" -a "$ip_addr" != "" ]; then
 		echo "Saving $pid $ip_addr to $TARGET_IPSAVE"
 		echo "$pid $ip_addr" > $TARGET_IPSAVE
 	fi
@@ -234,15 +234,19 @@ Test_Kill_Qemu()
 	fi
 
 	if [ $k -eq 1 ]; then
-		running=`ps -wwfp $QEMUPID`
-		if [ $? -eq 0 ]; then
-			echo "killing $QEMUPID"
-			kill $QEMUPID
+		if [ "$QEMUPID" != "0" -a "$QEMUPID" != "" ]; then
+			running=`ps -wwfp $QEMUPID`
+			if [ $? -eq 0 ]; then
+				echo "killing $QEMUPID"
+				kill $QEMUPID
+			fi
 		fi
-		running=`ps -wwfp $XTERMPID`
-		if [ $? -eq 0 ]; then
-			echo "killing $XTERMPID"
-			kill $XTERMPID
+		if [ "$XTERMPID" != "0" -a "$XTERMPID" != "" ]; then
+			running=`ps -wwfp $XTERMPID`
+			if [ $? -eq 0 ]; then
+				echo "killing $XTERMPID"
+				kill $XTERMPID
+			fi
 		fi
 	fi
 
@@ -336,6 +340,11 @@ Test_Fetch_Target_IP()
 	local opid=$1
 	local ip_addr=0
 
+	if [ "$opid" = "0" -o "$opid" = "" ]; then
+		echo ""
+		return
+	fi
+
 	# Check if $1 pid exists and contains ipaddr of target
 	ip_addr=`ps -wwfp $opid | grep -o "192\.168\.7\.[0-9]*::" | awk -F":" '{print $1}'`
 
@@ -433,8 +442,10 @@ Test_Create_Qemu()
 	# Parse IP address of target from the qemu command line
 	TARGET_IPADDR=`Test_Fetch_Target_IP $QEMUPID`
 	echo "Target IP is ${TARGET_IPADDR}"
-	if [ -z ${TARGET_IPADDR} -o "${TARGET_IPADDR}" = "0" ]; then
+	if [ ${TARGET_IPADDR} = "" -o "${TARGET_IPADDR}" = "0" ]; then
 		Test_Info "There is no qemu process or qemu ip address found, return failed"
+		ps -wwf
+		ps axww -O ppid
 		return 1
 	fi