test: add linux kbuild module test package

recipes/linux-kbuild-tree/all/test_package/Makefile

@@ -0,0 +1 @@
+obj-m += test_kbuild_module.o

recipes/linux-kbuild-tree/all/test_package/conanfile.py

@@ -0,0 +1,61 @@
+import os
+import shlex
+
+from conan import ConanFile
+from conan.errors import ConanException
+from conan.tools.files import copy
+
+
+class TestPackageConan(ConanFile):
+    test_type = "explicit"
+
+    settings = "os", "compiler", "build_type", "arch"
+    exports_sources = "Makefile", "test_kbuild_module.c"
+
+    def requirements(self):
+        self.requires(self.tested_reference_str)
+
+    def layout(self):
+        self.folders.build = "build"
+        self.folders.generators = os.path.join(self.folders.build, "generators")
+
+    def build(self):
+        kernel_tree = self.dependencies["linux-kbuild-tree"].package_folder
+        module_dir = os.path.join(self.build_folder, "module")
+        copy(self, "*", src=self.source_folder, dst=module_dir)
+
+        tree_info = self._read_tree_info(kernel_tree)
+        arch = tree_info.get("arch", "")
+        cross_compile = tree_info.get("cross_compile", "")
+        jobs = self.conf.get("tools.build:jobs", default=None)
+        make_jobs = f" -j{jobs}" if jobs else ""
+
+        command = (
+            f"make --no-print-directory -C {shlex.quote(kernel_tree)}{make_jobs} "
+            f"M={shlex.quote(module_dir)} "
+            f"ARCH={shlex.quote(arch)} "
+            f"CROSS_COMPILE={shlex.quote(cross_compile)} "
+            "KBUILD_MODPOST_WARN=1 "
+            "modules"
+        )
+        self.run(command)
+
+    def test(self):
+        module_path = os.path.join(self.build_folder, "module", "test_kbuild_module.ko")
+        if not os.path.isfile(module_path):
+            raise ConanException(f"Kernel module was not built: {module_path}")
+
+    def _read_tree_info(self, kernel_tree):
+        path = os.path.join(kernel_tree, "kbuild-tree-info.txt")
+        if not os.path.isfile(path):
+            raise ConanException(f"Missing linux-kbuild-tree metadata: {path}")
+
+        result = {}
+        with open(path, encoding="utf-8") as tree_info:
+            for line in tree_info:
+                line = line.strip()
+                if not line or "=" not in line:
+                    continue
+                key, value = line.split("=", 1)
+                result[key] = value
+        return result

recipes/linux-kbuild-tree/all/test_package/test_kbuild_module.c

@@ -0,0 +1,17 @@
+#include <linux/init.h>
+#include <linux/module.h>
+
+static int __init test_kbuild_module_init(void)
+{
+    return 0;
+}
+
+static void __exit test_kbuild_module_exit(void)
+{
+}
+
+module_init(test_kbuild_module_init);
+module_exit(test_kbuild_module_exit);
+
+MODULE_DESCRIPTION("linux-kbuild-tree Conan test module");
+MODULE_LICENSE("GPL");