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Date:   Mon, 16 Mar 2020 13:21:24 -0700
Message-Id: <20200316202125.15852-1-heidifahim@google.com>
Mime-Version: 1.0
Subject: [PATCH v3 1/2] kunit: kunit_parser: make parser more robust
From:   Heidi Fahim <heidifahim@google.com>
To:     shuah@kernel.org, brendanhiggins@google.com,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        kunit-dev@googlegroups.com
Cc:     Heidi Fahim <heidifahim@google.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Previously, kunit_parser did not properly handle kunit TAP output that
- had any prefixes (generated from different configs e.g.
CONFIG_PRINTK_TIME)
- had unrelated kernel output mixed in the middle of
it, which has shown up when testing with allyesconfig
To remove prefixes, the parser looks for the first line that includes
TAP output, "TAP version 14".  It then determines the length of the
string before this sequence, and strips that number of characters off
the beginning of the following lines until the last KUnit output line is
reached.
These fixes have been tested with additional tests in the
KUnitParseTest and their associated logs have also been added.

Signed-off-by: Heidi Fahim <heidifahim@google.com>
---
Changelog
 v3:
 - Addressing Shuah's git apply issues with whitespaces. Marked all
   files in test_data as binaries in new kunit/ .gitattributes file. The
   irregular whitespaces here are necessary as they are used for testing
   the KUnit parser.
 - Important: please note that now git apply works, however the .log
   files in /test_data/ may get marked as Untracked files. These should
   be included in the commit as they are required for
   kunit_tool_test.py.

tools/testing/kunit/.gitattributes            |   1 +
 tools/testing/kunit/kunit_parser.py           |  40 +++++-----
 tools/testing/kunit/kunit_tool_test.py        |  69 ++++++++++++++++++
 .../test_data/test_config_printk_time.log     | Bin 0 -> 1584 bytes
 .../test_data/test_interrupted_tap_output.log | Bin 0 -> 1982 bytes
 .../test_data/test_kernel_panic_interrupt.log | Bin 0 -> 1321 bytes
 .../test_data/test_multiple_prefixes.log      | Bin 0 -> 1832 bytes
 ..._output_with_prefix_isolated_correctly.log | Bin 0 -> 1655 bytes
 .../kunit/test_data/test_pound_no_prefix.log  | Bin 0 -> 1193 bytes
 .../kunit/test_data/test_pound_sign.log       | Bin 0 -> 1655 bytes
 10 files changed, 90 insertions(+), 20 deletions(-)
 create mode 100644 tools/testing/kunit/.gitattributes
 create mode 100644 tools/testing/kunit/test_data/test_config_printk_time.log
 create mode 100644 tools/testing/kunit/test_data/test_interrupted_tap_output.log
 create mode 100644 tools/testing/kunit/test_data/test_kernel_panic_interrupt.log
 create mode 100644 tools/testing/kunit/test_data/test_multiple_prefixes.log
 create mode 100644 tools/testing/kunit/test_data/test_output_with_prefix_isolated_correctly.log
 create mode 100644 tools/testing/kunit/test_data/test_pound_no_prefix.log
 create mode 100644 tools/testing/kunit/test_data/test_pound_sign.log

diff --git a/tools/testing/kunit/.gitattributes b/tools/testing/kunit/.gitattributes
new file mode 100644
index 000000000000..5b7da1fc3b8f
--- /dev/null
+++ b/tools/testing/kunit/.gitattributes
@@ -0,0 +1 @@
+test_data/* binary
diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
index 4ffbae0f6732..adf86747b07f 100644
--- a/tools/testing/kunit/kunit_parser.py
+++ b/tools/testing/kunit/kunit_parser.py
@@ -46,19 +46,21 @@ class TestStatus(Enum):
 	TEST_CRASHED = auto()
 	NO_TESTS = auto()
 
-kunit_start_re = re.compile(r'^TAP version [0-9]+$')
-kunit_end_re = re.compile('List of all partitions:')
+kunit_start_re = re.compile(r'TAP version [0-9]+$')
+kunit_end_re = re.compile('(List of all partitions:|'
+			  'Kernel panic - not syncing: VFS:|reboot: System halted)')
 
 def isolate_kunit_output(kernel_output):
 	started = False
 	for line in kernel_output:
-		if kunit_start_re.match(line):
+		if kunit_start_re.search(line):
+			prefix_len = len(line.split('TAP version')[0])
 			started = True
-			yield line
-		elif kunit_end_re.match(line):
+			yield line[prefix_len:] if prefix_len > 0 else line
+		elif kunit_end_re.search(line):
 			break
 		elif started:
-			yield line
+			yield line[prefix_len:] if prefix_len > 0 else line
 
 def raw_output(kernel_output):
 	for line in kernel_output:
@@ -108,18 +110,16 @@ OK_NOT_OK_SUBTEST = re.compile(r'^\t(ok|not ok) [0-9]+ - (.*)$')
 
 OK_NOT_OK_MODULE = re.compile(r'^(ok|not ok) [0-9]+ - (.*)$')
 
-def parse_ok_not_ok_test_case(lines: List[str],
-			      test_case: TestCase,
-			      expecting_test_case: bool) -> bool:
+def parse_ok_not_ok_test_case(lines: List[str], test_case: TestCase) -> bool:
 	save_non_diagnositic(lines, test_case)
 	if not lines:
-		if expecting_test_case:
-			test_case.status = TestStatus.TEST_CRASHED
-			return True
-		else:
-			return False
+		test_case.status = TestStatus.TEST_CRASHED
+		return True
 	line = lines[0]
 	match = OK_NOT_OK_SUBTEST.match(line)
+	while not match and lines:
+		line = lines.pop(0)
+		match = OK_NOT_OK_SUBTEST.match(line)
 	if match:
 		test_case.log.append(lines.pop(0))
 		test_case.name = match.group(2)
@@ -150,12 +150,12 @@ def parse_diagnostic(lines: List[str], test_case: TestCase) -> bool:
 	else:
 		return False
 
-def parse_test_case(lines: List[str], expecting_test_case: bool) -> TestCase:
+def parse_test_case(lines: List[str]) -> TestCase:
 	test_case = TestCase()
 	save_non_diagnositic(lines, test_case)
 	while parse_diagnostic(lines, test_case):
 		pass
-	if parse_ok_not_ok_test_case(lines, test_case, expecting_test_case):
+	if parse_ok_not_ok_test_case(lines, test_case):
 		return test_case
 	else:
 		return None
@@ -234,11 +234,11 @@ def parse_test_suite(lines: List[str]) -> TestSuite:
 	expected_test_case_num = parse_subtest_plan(lines)
 	if not expected_test_case_num:
 		return None
-	test_case = parse_test_case(lines, expected_test_case_num > 0)
-	expected_test_case_num -= 1
-	while test_case:
+	while expected_test_case_num > 0:
+		test_case = parse_test_case(lines)
+		if not test_case:
+			break
 		test_suite.cases.append(test_case)
-		test_case = parse_test_case(lines, expected_test_case_num > 0)
 		expected_test_case_num -= 1
 	if parse_ok_not_ok_test_suite(lines, test_suite):
 		test_suite.status = bubble_up_test_case_errors(test_suite)
diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
index cba97756ac4a..0efae697f396 100755
--- a/tools/testing/kunit/kunit_tool_test.py
+++ b/tools/testing/kunit/kunit_tool_test.py
@@ -108,6 +108,36 @@ class KUnitParserTest(unittest.TestCase):
 		self.assertContains('ok 1 - example', result)
 		file.close()
 
+	def test_output_with_prefix_isolated_correctly(self):
+		log_path = get_absolute_path(
+			'test_data/test_pound_sign.log')
+		with open(log_path) as file:
+			result = kunit_parser.isolate_kunit_output(file.readlines())
+		self.assertContains('TAP version 14\n', result)
+		self.assertContains('	# Subtest: kunit-resource-test', result)
+		self.assertContains('	1..5', result)
+		self.assertContains('	ok 1 - kunit_resource_test_init_resources', result)
+		self.assertContains('	ok 2 - kunit_resource_test_alloc_resource', result)
+		self.assertContains('	ok 3 - kunit_resource_test_destroy_resource', result)
+		self.assertContains(' foo bar 	#', result)
+		self.assertContains('	ok 4 - kunit_resource_test_cleanup_resources', result)
+		self.assertContains('	ok 5 - kunit_resource_test_proper_free_ordering', result)
+		self.assertContains('ok 1 - kunit-resource-test', result)
+		self.assertContains(' foo bar 	# non-kunit output', result)
+		self.assertContains('	# Subtest: kunit-try-catch-test', result)
+		self.assertContains('	1..2', result)
+		self.assertContains('	ok 1 - kunit_test_try_catch_successful_try_no_catch',
+				    result)
+		self.assertContains('	ok 2 - kunit_test_try_catch_unsuccessful_try_does_catch',
+				    result)
+		self.assertContains('ok 2 - kunit-try-catch-test', result)
+		self.assertContains('	# Subtest: string-stream-test', result)
+		self.assertContains('	1..3', result)
+		self.assertContains('	ok 1 - string_stream_test_empty_on_creation', result)
+		self.assertContains('	ok 2 - string_stream_test_not_empty_after_add', result)
+		self.assertContains('	ok 3 - string_stream_test_get_string', result)
+		self.assertContains('ok 3 - string-stream-test', result)
+
 	def test_parse_successful_test_log(self):
 		all_passed_log = get_absolute_path(
 			'test_data/test_is_test_passed-all_passed.log')
@@ -150,6 +180,45 @@ class KUnitParserTest(unittest.TestCase):
 			result.status)
 		file.close()
 
+	def test_ignores_prefix_printk_time(self):
+		prefix_log = get_absolute_path(
+			'test_data/test_config_printk_time.log')
+		with open(prefix_log) as file:
+			result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual('kunit-resource-test', result.suites[0].name)
+
+	def test_ignores_multiple_prefixes(self):
+		prefix_log = get_absolute_path(
+			'test_data/test_multiple_prefixes.log')
+		with open(prefix_log) as file:
+			result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual('kunit-resource-test', result.suites[0].name)
+
+	def test_prefix_mixed_kernel_output(self):
+		mixed_prefix_log = get_absolute_path(
+			'test_data/test_interrupted_tap_output.log')
+		with open(mixed_prefix_log) as file:
+			result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual('kunit-resource-test', result.suites[0].name)
+
+	def test_prefix_poundsign(self):
+		pound_log = get_absolute_path('test_data/test_pound_sign.log')
+		with open(pound_log) as file:
+			result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual('kunit-resource-test', result.suites[0].name)
+
+	def test_kernel_panic_end(self):
+		panic_log = get_absolute_path('test_data/test_kernel_panic_interrupt.log')
+		with open(panic_log) as file:
+			result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual('kunit-resource-test', result.suites[0].name)
+
+	def test_pound_no_prefix(self):
+		pound_log = get_absolute_path('test_data/test_pound_no_prefix.log')
+		with open(pound_log) as file:
+			result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual('kunit-resource-test', result.suites[0].name)
+
 class StrContains(str):
 	def __eq__(self, other):
 		return self in other
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-- 
2.25.1.481.gfbce0eb801-goog