WIP: dumpcap-start/stop: Make script fail, not hang on sudo prompt

- Also: Fix output of '-e' option in pure POSIX shell

Change-Id: Id160384bf624a4eb0f419cb8ba07d8b69bb693f3

ttcn3-dumpcap-start.sh

@@ -13,9 +13,21 @@ GSMTAP_PORT=4729
 
 TESTCASE=$1
 
+if ! [ "$(id -u)" = "0" ]; then
+	SUDOSTR="sudo -n"
+	# Check if sudo /usr/bin/kill, sudo /usr/bin/tcpdump can always be run without password prompt (otherwise this script may hang)
+	sudo -k
+	if ! (sudo -n echo test >/dev/null 2>&1); then
+		echo "Error: Make sure 'sudo /usr/bin/kill' and 'sudo /usr/bin/tcpdump' can be executed without a password (NOPASSWD in sudoers file)" >&2
+		exit 1
+	fi
+else
+	SUDOSTR=""
+fi
+
 kill_rm_pidfile() {
-	if [ -e $1 ]; then
-		kill "$(cat "$1")"
+	if ! [ -e "$1" ] && [ -s "$1" ]; then
+		$SUDOSTR kill "$(cat "$1")" 2>&1 || grep -v "No such process"
 		rm $1
 	fi
 }

ttcn3-dumpcap-stop.sh

@@ -5,18 +5,17 @@ PIDFILE_NETCAT=/tmp/netcat.pid
 TESTCASE=$1
 VERDICT="$2"
 
-kill_rm_pidfile() {
-if [ -e $1 ]; then
-        PSNAME="$(ps -q "$(cat "$1")" -o comm=)"
-	if [ "$PSNAME" != "sudo" ]; then
-		kill "$(cat "$1")"
-	else
-	# NOTE: This requires you to be root or something like
-	# "laforge ALL=NOPASSWD: /usr/sbin/tcpdump, /bin/kill" in your sudoers file
-		sudo kill "$(cat "$1")"
-	fi
-	rm $1
+if ! [ "$(id -u)" = "0" ]; then
+	SUDOSTR="sudo -n"
+else
+	SUDOSTR=""
 fi
+
+kill_rm_pidfile() {
+	if ! [ -e "$1" ] && [ -s "$1" ]; then
+		$SUDOSTR kill "$(cat "$1")" 2>&1 || grep -v "No such process"
+		rm $1
+	fi
 }
 
 date