kunit:tool: Don't write to stdout when it should be disabled

The kunit_parser module accepts a 'printer' object which is used as a
destination for all output. This is typically set to stdout, so that the
parsed results are visible, but can be set to a special 'null_printer' to
implement options where not all results are always printed.

However, there are a few places where use of stdout is hardcoded, notably
in handling crashed tests and in outputting the colour escape sequences.

Properly use the specified printer for all output. This is okay for the
colour handling (as this is already gated behind isatty() anyway), and also
for the crash handling, as cases where printer != stdout are separately
printed afterwards.

Link: https://lore.kernel.org/r/20260606020317.264178-1-david@davidgow.net
Fixes: 062a9dd ("kunit: tool: Only print the summary")
Signed-off-by: David Gow <david@davidgow.net>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: sulix

tools/testing/kunit/kunit_parser.py

@@ -17,7 +17,7 @@
 from enum import Enum, auto
 from typing import Iterable, Iterator, List, Optional, Tuple
 
-from kunit_printer import Printer, stdout
+from kunit_printer import Printer
 
 class Test:
 	"""
@@ -58,7 +58,7 @@ def __repr__(self) -> str:
 	def add_error(self, printer: Printer, error_message: str) -> None:
 		"""Records an error that occurred while parsing this test."""
 		self.counts.errors += 1
-		printer.print_with_timestamp(stdout.red('[ERROR]') + f' Test: {self.name}: {error_message}')
+		printer.print_with_timestamp(printer.red('[ERROR]') + f' Test: {self.name}: {error_message}')
 
 	def ok_status(self) -> bool:
 		"""Returns true if the status was ok, i.e. passed or skipped."""
@@ -549,7 +549,7 @@ def format_test_result(test: Test, printer: Printer) -> str:
 		return printer.yellow('[NO TESTS RUN] ') + test.name
 	if test.status == TestStatus.TEST_CRASHED:
 		print_log(test.log, printer)
-		return stdout.red('[CRASHED] ') + test.name
+		return printer.red('[CRASHED] ') + test.name
 	print_log(test.log, printer)
 	return printer.red('[FAILED] ') + test.name
 
@@ -656,11 +656,11 @@ def print_summary_line(test: Test, printer: Printer) -> None:
 	printer - Printer object to output results
 	"""
 	if test.status == TestStatus.SUCCESS:
-		color = stdout.green
+		color = printer.green
 	elif test.status in (TestStatus.SKIPPED, TestStatus.NO_TESTS):
-		color = stdout.yellow
+		color = printer.yellow
 	else:
-		color = stdout.red
+		color = printer.red
 	printer.print_with_timestamp(color(f'Testing complete. {test.counts}'))
 
 	# Summarize failures that might have gone off-screen since we had a lot