kunit: tool: handle when .kunit exists but .kunitconfig does not

Right now .kunitconfig and the build dir are automatically created if
the build dir does not exists; however, if the build dir is present and
.kunitconfig is not, kunit_tool will crash.

Fix this by checking for both the build dir as well as the .kunitconfig.

NOTE: This depends on commit 5578d00 ("kunit: tool: fix running
kunit_tool from outside kernel tree")

Link: https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/commit/?id=5578d008d9e06bb531fb3e62dd17096d9fd9c853
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: bjh83

tools/testing/kunit/kunit.py

@@ -261,6 +261,8 @@ def main(argv, linux=None):
 	if cli_args.subcommand == 'run':
 		if not os.path.exists(cli_args.build_dir):
 			os.mkdir(cli_args.build_dir)
+
+		if not os.path.exists(kunit_kernel.kunitconfig_path):
 			create_default_kunitconfig()
 
 		if not linux:
@@ -277,10 +279,12 @@ def main(argv, linux=None):
 		if result.status != KunitStatus.SUCCESS:
 			sys.exit(1)
 	elif cli_args.subcommand == 'config':
-		if cli_args.build_dir:
-			if not os.path.exists(cli_args.build_dir):
-				os.mkdir(cli_args.build_dir)
-				create_default_kunitconfig()
+		if cli_args.build_dir and (
+				not os.path.exists(cli_args.build_dir)):
+			os.mkdir(cli_args.build_dir)
+
+		if not os.path.exists(kunit_kernel.kunitconfig_path):
+			create_default_kunitconfig()
 
 		if not linux:
 			linux = kunit_kernel.LinuxSourceTree()