[PATCH 1/2] selftests: tool: Add subtest header line and change indentation format in TAP results

[Rae Moar <rmoar@google.com>]

This patch is part of a series to alter the format of kselftest TAP
results to improve compatibility with proposed KTAP specification
(https://lore.kernel.org/linux-kselftest/CA+GJov6tdjvY9x12JsJT14qn6c7NViJxqaJk+r-K1YJzPggFDQ@mail.gmail.com/).

Two changes:
- Change from "# " to "  " for indentation of nested tests
- Add subtest header line at start of tests with subtests. Line format
is "# Subtest: [name of test]".

An example of the new format:

Old format:

 TAP version 13
 1..1
 # TAP version 13
 # 1..1
 # # Starting 1 tests from 1 test cases.
 # #  RUN           global.get_syscall_info ...
 # #            OK  global.get_syscall_info
 # ok 1 global.get_syscall_info
 # # PASSED: 1 / 1 tests passed.
 # # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
 ok 1 selftests: ptrace: get_syscall_info

New format:

TAP version 13
1..1
  # Subtest: selftests: ptrace: get_syscall_info
  TAP version 13
  1..1
  # Starting 1 tests from 1 test cases.
  #  RUN           global.get_syscall_info ...
  #            OK  global.get_syscall_info
  ok 1 global.get_syscall_info
  # PASSED: 1 / 1 tests passed.
  # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
ok 1 selftests: ptrace: get_syscall_info

Signed-off-by: Rae Moar <rmoar@google.com>
Change-Id: I139774745310ad2cd6dc5d7740254e48d8226241
---
 tools/testing/selftests/kselftest/prefix.pl | 2 +-
 tools/testing/selftests/kselftest/runner.sh | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/kselftest/prefix.pl b/tools/testing/selftests/kselftest/prefix.pl
index 12a7f4ca2684..e59374b62603 100755
--- a/tools/testing/selftests/kselftest/prefix.pl
+++ b/tools/testing/selftests/kselftest/prefix.pl
@@ -16,7 +16,7 @@ while (1) {
 	my $bytes = sysread(STDIN, $char, 1);
 	exit 0 if ($bytes == 0);
 	if ($needed) {
-		print "# ";
+		print "  ";
 		$needed = 0;
 	}
 	print $char;
diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh
index cc9c846585f0..9b04aeb26d3a 100644
--- a/tools/testing/selftests/kselftest/runner.sh
+++ b/tools/testing/selftests/kselftest/runner.sh
@@ -23,7 +23,7 @@ fi
 tap_prefix()
 {
 	if [ ! -x /usr/bin/perl ]; then
-		sed -e 's/^/# /'
+		sed -e 's/^/  /'
 	else
 		"$BASE_DIR"/kselftest/prefix.pl
 	fi
@@ -75,7 +75,8 @@ run_one()
 		echo "not ok $test_num $TEST_HDR_MSG"
 	else
 		cd `dirname $TEST` > /dev/null
-		((((( tap_timeout ./$BASENAME_TEST 2>&1; echo $? >&3) |
+		(echo "  # Subtest: selftests: $DIR: $BASENAME_TEST" &&
+		(((( tap_timeout ./$BASENAME_TEST 2>&1; echo $? >&3) |
 			tap_prefix >&4) 3>&1) |
 			(read xs; exit $xs)) 4>>"$logfile" &&
 		echo "ok $test_num $TEST_HDR_MSG") ||
@@ -83,7 +84,6 @@ run_one()
 		if [ $rc -eq $skip_rc ]; then	\
 			echo "ok $test_num $TEST_HDR_MSG # SKIP"
 		elif [ $rc -eq $timeout_rc ]; then \
-			echo "#"
 			echo "not ok $test_num $TEST_HDR_MSG # TIMEOUT $kselftest_timeout seconds"
 		else
 			echo "not ok $test_num $TEST_HDR_MSG # exit=$rc"
-- 
2.33.0.259.gc128427fd7-goog