[PATCH v2] selftests/ftrace: Improve integration with kselftest runner

[Mark Brown <broonie@kernel.org>]

The ftrace selftests do not currently produce KTAP output, they produce a
custom format much nicer for human consumption. This means that when run in
automated test systems we just get a single result for the suite as a whole
rather than recording results for individual test cases, making it harder
to look at the test data and masking things like inappropriate skips.

Address this by adding support for KTAP output to the ftracetest script and
providing a trivial wrapper which will be invoked by the kselftest runner
to generate output in this format by default, users using ftracetest
directly will continue to get the existing output.

This is not the most elegant solution but it is simple and effective. I
did consider implementing this by post processing the existing output
format but that felt more complex and likely to result in all output being
lost if something goes seriously wrong during the run which would not be
helpful. I did also consider just writing a separate runner script but
there's enough going on with things like the signal handling for that to
seem like it would be duplicating too much.

Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Tested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
Changes in v2:
- Update help text.
- Link to v1: https://lore.kernel.org/r/20230302-ftrace-kselftest-ktap-v1-1-a84a0765b7ad@kernel.org
---
 tools/testing/selftests/ftrace/Makefile        |  3 +-
 tools/testing/selftests/ftrace/ftracetest      | 63 ++++++++++++++++++++++++--
 tools/testing/selftests/ftrace/ftracetest-ktap |  8 ++++
 3 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile
index d6e106fbce11..a1e955d2de4c 100644
--- a/tools/testing/selftests/ftrace/Makefile
+++ b/tools/testing/selftests/ftrace/Makefile
@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 all:
 
-TEST_PROGS := ftracetest
+TEST_PROGS_EXTENDED := ftracetest
+TEST_PROGS := ftracetest-ktap
 TEST_FILES := test.d settings
 EXTRA_CLEAN := $(OUTPUT)/logs/*
 
diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index c3311c8c4089..2506621e75df 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -13,6 +13,7 @@ echo "Usage: ftracetest [options] [testcase(s)] [testcase-directory(s)]"
 echo " Options:"
 echo "		-h|--help  Show help message"
 echo "		-k|--keep  Keep passed test logs"
+echo "		-K|--ktap  Output in KTAP format"
 echo "		-v|--verbose Increase verbosity of test messages"
 echo "		-vv        Alias of -v -v (Show all results in stdout)"
 echo "		-vvv       Alias of -v -v -v (Show all commands immediately)"
@@ -85,6 +86,10 @@ parse_opts() { # opts
       KEEP_LOG=1
       shift 1
     ;;
+    --ktap|-K)
+      KTAP=1
+      shift 1
+    ;;
     --verbose|-v|-vv|-vvv)
       if [ $VERBOSE -eq -1 ]; then
 	usage "--console can not use with --verbose"
@@ -178,6 +183,7 @@ TEST_DIR=$TOP_DIR/test.d
 TEST_CASES=`find_testcases $TEST_DIR`
 LOG_DIR=$TOP_DIR/logs/`date +%Y%m%d-%H%M%S`/
 KEEP_LOG=0
+KTAP=0
 DEBUG=0
 VERBOSE=0
 UNSUPPORTED_RESULT=0
@@ -229,7 +235,7 @@ prlog() { # messages
     newline=
     shift
   fi
-  printf "$*$newline"
+  [ "$KTAP" != "1" ] && printf "$*$newline"
   [ "$LOG_FILE" ] && printf "$*$newline" | strip_esc >> $LOG_FILE
 }
 catlog() { #file
@@ -260,11 +266,11 @@ TOTAL_RESULT=0
 
 INSTANCE=
 CASENO=0
+CASENAME=
 
 testcase() { # testfile
   CASENO=$((CASENO+1))
-  desc=`grep "^#[ \t]*description:" $1 | cut -f2- -d:`
-  prlog -n "[$CASENO]$INSTANCE$desc"
+  CASENAME=`grep "^#[ \t]*description:" $1 | cut -f2- -d:`
 }
 
 checkreq() { # testfile
@@ -277,40 +283,68 @@ test_on_instance() { # testfile
   grep -q "^#[ \t]*flags:.*instance" $1
 }
 
+ktaptest() { # result comment
+  if [ "$KTAP" != "1" ]; then
+    return
+  fi
+
+  local result=
+  if [ "$1" = "1" ]; then
+    result="ok"
+  else
+    result="not ok"
+  fi
+  shift
+
+  local comment=$*
+  if [ "$comment" != "" ]; then
+    comment="# $comment"
+  fi
+
+  echo $CASENO $result $INSTANCE$CASENAME $comment
+}
+
 eval_result() { # sigval
   case $1 in
     $PASS)
       prlog "	[${color_green}PASS${color_reset}]"
+      ktaptest 1
       PASSED_CASES="$PASSED_CASES $CASENO"
       return 0
     ;;
     $FAIL)
       prlog "	[${color_red}FAIL${color_reset}]"
+      ktaptest 0
       FAILED_CASES="$FAILED_CASES $CASENO"
       return 1 # this is a bug.
     ;;
     $UNRESOLVED)
       prlog "	[${color_blue}UNRESOLVED${color_reset}]"
+      ktaptest 0 UNRESOLVED
       UNRESOLVED_CASES="$UNRESOLVED_CASES $CASENO"
       return $UNRESOLVED_RESULT # depends on use case
     ;;
     $UNTESTED)
       prlog "	[${color_blue}UNTESTED${color_reset}]"
+      ktaptest 1 SKIP
       UNTESTED_CASES="$UNTESTED_CASES $CASENO"
       return 0
     ;;
     $UNSUPPORTED)
       prlog "	[${color_blue}UNSUPPORTED${color_reset}]"
+      ktaptest 1 SKIP
       UNSUPPORTED_CASES="$UNSUPPORTED_CASES $CASENO"
       return $UNSUPPORTED_RESULT # depends on use case
     ;;
     $XFAIL)
       prlog "	[${color_green}XFAIL${color_reset}]"
+      ktaptest 1 XFAIL
       XFAILED_CASES="$XFAILED_CASES $CASENO"
       return 0
     ;;
     *)
       prlog "	[${color_blue}UNDEFINED${color_reset}]"
+      ktaptest 0 error
       UNDEFINED_CASES="$UNDEFINED_CASES $CASENO"
       return 1 # this must be a test bug
     ;;
@@ -371,6 +405,7 @@ __run_test() { # testfile
 run_test() { # testfile
   local testname=`basename $1`
   testcase $1
+  prlog -n "[$CASENO]$INSTANCE$CASENAME"
   if [ ! -z "$LOG_FILE" ] ; then
     local testlog=`mktemp $LOG_DIR/${CASENO}-${testname}-log.XXXXXX`
   else
@@ -405,6 +440,17 @@ run_test() { # testfile
 # load in the helper functions
 . $TEST_DIR/functions
 
+if [ "$KTAP" = "1" ]; then
+  echo "TAP version 13"
+
+  casecount=`echo $TEST_CASES | wc -w`
+  for t in $TEST_CASES; do
+    test_on_instance $t || continue
+    casecount=$((casecount+1))
+  done
+  echo "1..${casecount}"
+fi
+
 # Main loop
 for t in $TEST_CASES; do
   run_test $t
@@ -439,6 +485,17 @@ prlog "# of unsupported: " `echo $UNSUPPORTED_CASES | wc -w`
 prlog "# of xfailed: " `echo $XFAILED_CASES | wc -w`
 prlog "# of undefined(test bug): " `echo $UNDEFINED_CASES | wc -w`
 
+if [ "$KTAP" = "1" ]; then
+  echo -n "# Totals:"
+  echo -n " pass:"`echo $PASSED_CASES | wc -w`
+  echo -n " faii:"`echo $FAILED_CASES | wc -w`
+  echo -n " xfail:"`echo $XFAILED_CASES | wc -w`
+  echo -n " xpass:0"
+  echo -n " skip:"`echo $UNTESTED_CASES $UNSUPPORTED_CASES | wc -w`
+  echo -n " error:"`echo $UNRESOLVED_CASES $UNDEFINED_CASES | wc -w`
+  echo
+fi
+
 cleanup
 
 # if no error, return 0
diff --git a/tools/testing/selftests/ftrace/ftracetest-ktap b/tools/testing/selftests/ftrace/ftracetest-ktap
new file mode 100755
index 000000000000..b3284679ef3a
--- /dev/null
+++ b/tools/testing/selftests/ftrace/ftracetest-ktap
@@ -0,0 +1,8 @@
+#!/bin/sh -e
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# ftracetest-ktap: Wrapper to integrate ftracetest with the kselftest runner
+#
+# Copyright (C) Arm Ltd., 2023
+
+./ftracetest -K

---
base-commit: 457391b0380335d5e9a5babdec90ac53928b23b4
change-id: 20230302-ftrace-kselftest-ktap-9d7878691557

Best regards,
-- 
Mark Brown <broonie@kernel.org>