linux-kernel - [PATCH] kunit: tool: make --raw_output=kunit (aka --raw

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Date:   Wed, 10 Aug 2022 16:02:58 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     brendanhiggins@...gle.com, davidgow@...gle.com
Cc:     linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org,
        Daniel Latypov <dlatypov@...gle.com>
Subject: [PATCH] kunit: tool: make --raw_output=kunit (aka --raw_output)
 preserve leading spaces

With
$ kunit.py run --raw_output=all ...
you get the raw output from the kernel, e.g. something like
> TAP version 14
> 1..26
>     # Subtest: time_test_cases
>     1..1
>     ok 1 - time64_to_tm_test_date_range
> ok 1 - time_test_cases

But --raw_output=kunit or equivalently --raw_output, you get
> TAP version 14
> 1..26
> # Subtest: time_test_cases
> 1..1
> ok 1 - time64_to_tm_test_date_range
> ok 1 - time_test_cases

It looks less readable in my opinion, and it also isn't "raw output."

This is due to sharing code with kunit_parser.py, which wants to strip
leading whitespace since it uses anchored regexes.
We could update the kunit_parser.py code to tolerate leaading spaces,
but this patch takes the easier way out and adds a bool flag.

Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
---
 tools/testing/kunit/kunit.py        |  2 +-
 tools/testing/kunit/kunit_parser.py | 10 ++++++----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index e132b0654029..161a3b1b0217 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -206,7 +206,7 @@ def parse_tests(request: KunitParseRequest, metadata: kunit_json.Metadata, input
 		if request.raw_output == 'all':
 			pass
 		elif request.raw_output == 'kunit':
-			output = kunit_parser.extract_tap_lines(output)
+			output = kunit_parser.extract_tap_lines(output, lstrip=False)
 		for line in output:
 			print(line.rstrip())
 
diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
index 12d3ec77f427..1ae873e3e341 100644
--- a/tools/testing/kunit/kunit_parser.py
+++ b/tools/testing/kunit/kunit_parser.py
@@ -218,7 +218,7 @@ TAP_START = re.compile(r'TAP version ([0-9]+)$')
 KTAP_END = re.compile('(List of all partitions:|'
 	'Kernel panic - not syncing: VFS:|reboot: System halted)')
 
-def extract_tap_lines(kernel_output: Iterable[str]) -> LineStream:
+def extract_tap_lines(kernel_output: Iterable[str], lstrip=True) -> LineStream:
 	"""Extracts KTAP lines from the kernel output."""
 	def isolate_ktap_output(kernel_output: Iterable[str]) \
 			-> Iterator[Tuple[int, str]]:
@@ -244,9 +244,11 @@ def extract_tap_lines(kernel_output: Iterable[str]) -> LineStream:
 				# stop extracting KTAP lines
 				break
 			elif started:
-				# remove prefix and any indention and yield
-				# line with line number
-				line = line[prefix_len:].lstrip()
+				# remove the prefix and optionally any leading
+				# whitespace. Our parsing logic relies on this.
+				line = line[prefix_len:]
+				if lstrip:
+					line = line.lstrip()
 				yield line_num, line
 	return LineStream(lines=isolate_ktap_output(kernel_output))
 

base-commit: aeb6e6ac18c73ec287b3b1e2c913520699358c13
-- 
2.37.1.559.g78731f0fdb-goog