improve logic for root owned devices

root/etc/cont-init.d/50-gid-video

@@ -15,10 +15,10 @@ fi
 for i in $FILES
 do
 	VIDEO_GID=$(stat -c '%g' "$i")
-	if ! id -G abc | grep -qw "$VIDEO_GID"; then
-		if [ "${VIDEO_GID}" == '0' ]; then
-			usermod -a -G root abc
-		else
+	if id -G abc | grep -qw "$VIDEO_GID"; then
+		touch /groupadd
+	else
+		if [ ! "${VIDEO_GID}" == '0' ]; then
 			VIDEO_NAME=$(getent group "${VIDEO_GID}" | awk -F: '{print $1}')
 			if [ -z "${VIDEO_NAME}" ]; then
 				VIDEO_NAME="video$(head /dev/urandom | tr -dc 0-9 | head -c4)"
@@ -26,6 +26,11 @@ do
 				groupmod -g "$VIDEO_GID" "$VIDEO_NAME"
 			fi
 			usermod -a -G "$VIDEO_NAME" abc
+			touch /groupadd
 		fi
 	fi
-done
+done
+
+if [ ! -z "${FILES}" ] && [ ! -f "/groupadd" ]; then
+	usermod -a -G root abc
+fi