[PATCH] kunit: tool: make `build` subcommand also reconfigure if needed

[Daniel Latypov]

If I created a kunitconfig file that was incomplete, then
$ ./tools/testing/kunit/kunit.py build --kunitconfig=my_kunitconfig
would silently drop all the options with unmet dependencies!

This is because it doesn't do the config check that `kunit.py config`
does.

So if I want to safely build a kernel for testing, I have to do
$ ./tools/testing/kunit/kunit.py config <flags>
$ ./tools/testing/kunit/kunit.py build <flags, again>

It seems unlikely that any user of kunit.py would want the current
`build` semantics.
So make it effectively do `kunit.py config` + `kunit.py build`.

Signed-off-by: Daniel Latypov <dlatypov@xxxxxxxxxx>
---
Note: this patch depends on https://lore.kernel.org/linux-kselftest/20211009015406.1311319-1-dlatypov@xxxxxxxxxx/
That patch simplifies all these functions by reducing the amount of
boilerplate needed to convert between XXXRequest types.

But we can rewrite this so it doesn't have that dep at the cost of
the patch becoming more verbose.
---
 tools/testing/kunit/kunit.py           | 10 +++++++++-
 tools/testing/kunit/kunit_tool_test.py |  2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index 367e29d6942b..99068532485d 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -110,6 +110,14 @@ def build_tests(linux: kunit_kernel.LinuxSourceTree,
 			   'built kernel successfully',
 			   build_end - build_start)
 
+def config_and_build_tests(linux: kunit_kernel.LinuxSourceTree,
+			   request: KunitBuildRequest) -> KunitResult:
+	config_result = config_tests(linux, request)
+	if config_result.status != KunitStatus.SUCCESS:
+		return config_result
+
+	return build_tests(linux, request)
+
 def _list_tests(linux: kunit_kernel.LinuxSourceTree, request: KunitExecRequest) -> List[str]:
 	args = ['kunit.action=list']
 	if request.kernel_args:
@@ -451,7 +459,7 @@ def main(argv, linux=None):
 					    make_options=cli_args.make_options,
 					    jobs=cli_args.jobs,
 					    alltests=cli_args.alltests)
-		result = build_tests(linux, request)
+		result = config_and_build_tests(linux, request)
 		kunit_parser.print_with_timestamp((
 			'Elapsed time: %.3fs\n') % (
 				result.elapsed_time))
diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
index 178321d1f190..43ced874d5ad 100755
--- a/tools/testing/kunit/kunit_tool_test.py
+++ b/tools/testing/kunit/kunit_tool_test.py
@@ -418,7 +418,7 @@ class KUnitMainTest(unittest.TestCase):
 
 	def test_build_passes_args_pass(self):
 		kunit.main(['build'], self.linux_source_mock)
-		self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 0)
+		self.assertEqual(self.linux_source_mock.build_reconfig.call_count, 1)
 		self.linux_source_mock.build_kernel.assert_called_once_with(False, 8, '.kunit', None)
 		self.assertEqual(self.linux_source_mock.run_kernel.call_count, 0)
 
-- 
2.34.0.384.gca35af8252-goog