scripts: add & use get_filelist()

This does not support filenames which contain newlines, as that would
make the scripts significantly more complicated.

Newlines aren't part of the POSIX Portable Filename Character Set.
The GNU style of using null-separated lists is interesting, but it's not
part of POSIX so it's not portable.

References:
- https://dwheeler.com/essays/fixing-unix-linux-filenames.html
- Use `find` instead of `ls` to better handle non-alphanumeric filenames.
  https://www.shellcheck.net/wiki/SC2012

tests/shared_test_functions.sh

@@ -26,6 +26,9 @@
 #   Set up the below variables.
 # - expected_exitcode(expected, actual):
 #   Check if ${expected} matches ${actual}.
+# - get_filelist (pattern):
+#   Return a sorted list of files corresponding to ${pattern}, separated by
+#   newlines.
 # - run_scenarios():
 #   Run scenarios in the test directory.
 #
@@ -205,6 +208,29 @@ expected_exitcode() {
 	fi
 }
 
+## get_filelist (pattern):
+# Return a sorted list of files corresponding to ${pattern}, separated by
+# newlines.
+get_filelist() {
+	_get_filelist_pattern=$1
+
+	# Separate the pattern into directory and basename.
+	_get_filelist_dir=$(dirname "${_get_filelist_pattern}")
+	_get_filelist_base=$(basename "${_get_filelist_pattern}")
+
+	# Find all files matching the pattern.  Don't complain if the
+	# directory does not exist (e.g., checking for non-existent valgrind
+	# logfiles).
+	_get_filelist_unsorted=$(find "${_get_filelist_dir}"		\
+	    -name "${_get_filelist_base}" -prune -print 2>/dev/null)
+
+	# Sort the list.
+	_get_filelist_filelist=$(printf "%s" "${_get_filelist_unsorted}" | sort)
+
+	# Return the sorted list.
+	printf "%s" "${_get_filelist_filelist}"
+}
+
 ## notify_success_or_fail (log_basename, val_log_basename):
 # Examine all "exit code" files beginning with ${log_basename} and
 # print "SUCCESS!", "FAILED!", "SKIP!", or "PARTIAL SUCCESS / SKIP!"
@@ -217,7 +243,7 @@ notify_success_or_fail() {
 	val_log_basename=$2
 
 	# Bail if there's no exitfiles.
-	exitfiles=$(ls "${log_basename}"-*.exit) || true
+	exitfiles=$(set -o noglob; get_filelist "${log_basename}"-*.exit)
 	if [ -z "${exitfiles}" ]; then
 		echo "FAILED" 1>&2
 		s_retval=1
@@ -229,7 +255,7 @@ notify_success_or_fail() {
 	skip_exitfiles=0
 
 	# Check each exitfile.
-	for exitfile in $(echo "${exitfiles}" | sort); do
+	for exitfile in ${exitfiles}; do
 		ret=$(cat "${exitfile}")
 		total_exitfiles=$(( total_exitfiles + 1 ))
 		if [ "${ret}" -lt 0 ]; then
@@ -313,11 +339,13 @@ scenario_runner() {
 ## run_scenarios (scenario_filenames):
 # Run all scenarios matching ${scenario_filenames}.
 run_scenarios() {
-	# Get the test number(s) to run.
+	# Get the test scenarios(s) to run.
 	if [ "${N:-0}" -gt "0" ]; then
+		# There will only be one such file, so no need to sort.
 		test_scenarios="$(printf "${scriptdir}/%02d-*.sh" "${N}")"
 	else
-		test_scenarios="${scriptdir}/??-*.sh"
+		test_scenarios="$(set -o noglob;			\
+		    get_filelist "${scriptdir}"/??-*.sh)"
 	fi
 
 	# Clean up any previous directory, and create a new one.

tests/shared_valgrind_functions.sh

@@ -327,7 +327,7 @@ valgrind_check_basenames() {
 	val_basename=$(valgrind_get_basename "${exitfile}")
 
 	# Get list of files to check.  (Yes, the star goes outside the quotes.)
-	logfiles=$(ls "${val_basename}"* 2>/dev/null)
+	logfiles=$(set -o noglob; get_filelist "${val_basename}"*)
 	num_logfiles=$(echo "${logfiles}" | wc -w)
 
 	# Bail if we don't have any valgrind logfiles to check.