[RFC PATCH 1/2] kunit: tool: Move qemu architecture dependency checks into a function

[David Gow <davidgow@google.com>]

Currently the RISC-V qemu architecture config has some code to check for
the presence of the BIOS files before loading, printing a message and
quitting if it's not present.

However, this prevents us from loading the architecture file even just
to inspect it if the dependencies are not present. Instead, have kunit.py
look for a check_dependencies function, and call it if present only when
the architecture config is being used.

This is necessary for future changes which enumerate or automatically
select an architecture.

Signed-off-by: David Gow <davidgow@google.com>
---
 tools/testing/kunit/kunit_kernel.py       |  5 +++++
 tools/testing/kunit/qemu_configs/riscv.py | 10 ++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
index 260d8d9aa1db..c3201a76da24 100644
--- a/tools/testing/kunit/kunit_kernel.py
+++ b/tools/testing/kunit/kunit_kernel.py
@@ -230,6 +230,11 @@ def _get_qemu_ops(config_path: str,
 	assert isinstance(spec.loader, importlib.abc.Loader)
 	spec.loader.exec_module(config)
 
+	# Check for any per-architecture dependencies
+	if hasattr(config, 'check_dependencies'):
+		if not config.check_dependencies():
+			raise ValueError('Missing dependencies for ' + config_path)
+
 	if not hasattr(config, 'QEMU_ARCH'):
 		raise ValueError('qemu_config module missing "QEMU_ARCH": ' + config_path)
 	params: qemu_config.QemuArchParams = config.QEMU_ARCH
diff --git a/tools/testing/kunit/qemu_configs/riscv.py b/tools/testing/kunit/qemu_configs/riscv.py
index c87758030ff7..3c271d1005d9 100644
--- a/tools/testing/kunit/qemu_configs/riscv.py
+++ b/tools/testing/kunit/qemu_configs/riscv.py
@@ -6,10 +6,12 @@ import sys
 OPENSBI_FILE = 'opensbi-riscv64-generic-fw_dynamic.bin'
 OPENSBI_PATH = '/usr/share/qemu/' + OPENSBI_FILE
 
-if not os.path.isfile(OPENSBI_PATH):
-	print('\n\nOpenSBI bios was not found in "' + OPENSBI_PATH + '".\n'
-	      'Please ensure that qemu-system-riscv is installed, or edit the path in "qemu_configs/riscv.py"\n')
-	sys.exit()
+def check_dependencies() -> bool:
+    if not os.path.isfile(OPENSBI_PATH):
+	    print('\n\nOpenSBI bios was not found in "' + OPENSBI_PATH + '".\n'
+	          'Please ensure that qemu-system-riscv is installed, or edit the path in "qemu_configs/riscv.py"\n')
+	    return False
+    return True
 
 QEMU_ARCH = QemuArchParams(linux_arch='riscv',
 			   kconfig='''
-- 
2.50.1.552.g942d659e1b-goog