[PATCH stable 6.18 2/2] kunit: tool: skip stty when stdin is not a tty

[Florian Fainelli <florian.fainelli@broadcom.com>]

From: Shuvam Pandey <shuvampandey1@gmail.com>

commit e42c349f4cdfa43cb39a68c8f764f8cafc23a9a9 upstream

run_kernel() cleanup and signal_handler() invoke stty unconditionally.
When stdin is not a tty (for example in CI or unit tests), this writes
noise to stderr.

Call stty only when stdin is a tty.

Add regression tests for these paths:
- run_kernel() with non-tty stdin
- signal_handler() with non-tty stdin
- signal_handler() with tty stdin

Signed-off-by: Shuvam Pandey <shuvampandey1@gmail.com>
Reviewed-by: David Gow <david@davidgow.net>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
[florian: add missing 'import sys' required by sys.stdin.isatty(); the
module was already present in the mainline tree before this commit but
was absent from the 6.12 base of kunit_kernel.py]
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
Change-Id: I6c5292f5db0f5ce95399ee3dc87c00116709391e
---
 tools/testing/kunit/kunit_kernel.py    | 10 ++++--
 tools/testing/kunit/kunit_tool_test.py | 42 ++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
index 4f0bec8fb4e1..2869fcb199ff 100644
--- a/tools/testing/kunit/kunit_kernel.py
+++ b/tools/testing/kunit/kunit_kernel.py
@@ -346,6 +346,12 @@ class LinuxSourceTree:
 			return False
 		return self.validate_config(build_dir)
 
+	def _restore_terminal_if_tty(self) -> None:
+		# stty requires a controlling terminal; skip headless runs.
+		if sys.stdin is None or not sys.stdin.isatty():
+			return
+		subprocess.call(['stty', 'sane'])
+
 	def run_kernel(self, args: Optional[List[str]]=None, build_dir: str='', filter_glob: str='', filter: str='', filter_action: Optional[str]=None, timeout: Optional[int]=None) -> Iterator[str]:
 		# Copy to avoid mutating the caller-supplied list. exec_tests() reuses
 		# the same args across repeated run_kernel() calls (e.g. --run_isolated),
@@ -393,11 +399,11 @@ class LinuxSourceTree:
 			output.close()
 
 			waiter.join()
-			subprocess.call(['stty', 'sane'])
+			self._restore_terminal_if_tty()
 
 	def signal_handler(self, unused_sig: int, unused_frame: Optional[FrameType]) -> None:
 		logging.error('Build interruption occurred. Cleaning console.')
 		if self._process:
 				self._process.terminate()
 				self._process.wait()
-		subprocess.call(['stty', 'sane'])
+		self._restore_terminal_if_tty()
diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
index ed45bac1548d..0eb61de9abd4 100755
--- a/tools/testing/kunit/kunit_tool_test.py
+++ b/tools/testing/kunit/kunit_tool_test.py
@@ -515,6 +515,48 @@ class LinuxSourceTreeTest(unittest.TestCase):
 				self.assertIn('kunit.filter_glob=suite.test1', start_calls[0])
 				self.assertIn('kunit.filter_glob=suite.test2', start_calls[1])
 
+	def test_run_kernel_skips_terminal_reset_without_tty(self):
+		def fake_start(unused_args, unused_build_dir):
+			return subprocess.Popen(['printf', 'KTAP version 1\n'],
+						text=True, stdout=subprocess.PIPE)
+
+		non_tty_stdin = mock.Mock()
+		non_tty_stdin.isatty.return_value = False
+
+		with tempfile.TemporaryDirectory('') as build_dir:
+			tree = kunit_kernel.LinuxSourceTree(build_dir, kunitconfig_paths=[os.devnull])
+			with mock.patch.object(tree._ops, 'start', side_effect=fake_start), \
+			     mock.patch.object(kunit_kernel.sys, 'stdin', non_tty_stdin), \
+			     mock.patch.object(kunit_kernel.subprocess, 'call') as mock_call:
+				for _ in tree.run_kernel(build_dir=build_dir):
+					pass
+
+				mock_call.assert_not_called()
+
+	def test_signal_handler_skips_terminal_reset_without_tty(self):
+		non_tty_stdin = mock.Mock()
+		non_tty_stdin.isatty.return_value = False
+		tree = kunit_kernel.LinuxSourceTree('', kunitconfig_paths=[os.devnull])
+
+		with mock.patch.object(kunit_kernel.sys, 'stdin', non_tty_stdin), \
+		     mock.patch.object(kunit_kernel.subprocess, 'call') as mock_call, \
+		     mock.patch.object(kunit_kernel.logging, 'error') as mock_error:
+			tree.signal_handler(signal.SIGINT, None)
+			mock_error.assert_called_once()
+			mock_call.assert_not_called()
+
+	def test_signal_handler_resets_terminal_with_tty(self):
+		tty_stdin = mock.Mock()
+		tty_stdin.isatty.return_value = True
+		tree = kunit_kernel.LinuxSourceTree('', kunitconfig_paths=[os.devnull])
+
+		with mock.patch.object(kunit_kernel.sys, 'stdin', tty_stdin), \
+		     mock.patch.object(kunit_kernel.subprocess, 'call') as mock_call, \
+		     mock.patch.object(kunit_kernel.logging, 'error') as mock_error:
+			tree.signal_handler(signal.SIGINT, None)
+			mock_error.assert_called_once()
+			mock_call.assert_called_once_with(['stty', 'sane'])
+
 	def test_build_reconfig_no_config(self):
 		with tempfile.TemporaryDirectory('') as build_dir:
 			with open(kunit_kernel.get_kunitconfig_path(build_dir), 'w') as f:
-- 
2.34.1