Add support for external test scripts

Enhance the ./check test driver with an option to call external scripts
as if they resided inside xfstests. This should help prototyping tests
built on top of xfstests infrastructure without actually adding them to
the framework first.

Signed-off-by: David Sterba <[email protected]>

check

@@ -28,6 +28,7 @@ iterations=1
 istop=false
 loop_on_fail=0
 exclude_tests=()
+EXTERNAL_SCRIPTS=()
 
 # This is a global variable used to pass test failure text to reporting gunk
 _err_msg=""
@@ -83,6 +84,7 @@ check options
     -s section		run only specified section from config file
     -S section		exclude the specified section from the config file
     -L <n>		loop tests <n> times following a failure, measuring aggregate pass/fail metrics
+    --external FILE     use external testscript FILE, can be specified multiple times
 
 testlist options
     -g group[,group...]	include tests from these groups
@@ -342,6 +344,16 @@ while [ $# -gt 0 ]; do
 		loop_on_fail=$2; shift
 		;;
 
+	--external)
+		xfile="$2"; shift;
+		if ! [ -f "$xfile" ]; then
+			echo "External script $xfile is not a file"
+			exit 1
+		fi
+		echo "Adding external script $xfile"
+		EXTERNAL_SCRIPTS+=("$xfile")
+		;;
+
 	-*)	usage ;;
 	*)	# not an argument, we've got tests now.
 		have_test_arg=true ;;
@@ -385,6 +397,10 @@ if [ -n "$subdir_xfile" ]; then
 	done
 fi
 
+for ext in ${EXTERNAL_SCRIPTS[*]}; do
+	echo "$ext" >> $tmp.list
+done
+
 # Process tests from command line now.
 if $have_test_arg; then
 	while [ $# -gt 0 ]; do