testsuite: add modinfo fallback custom ver test

Check whether modinfo --set-version is able to find modules in
/run/modules/<custom-ver> when /lib/modules/<custom-ver> is missing.

Signed-off-by: Vitaly Kuznetsov <[email protected]>

scripts/setup-rootfs.sh

@@ -115,6 +115,7 @@ map=(
     ["test-modinfo/mod-simple-pkcs7.ko"]="mod-simple.ko"
     ["test-modinfo/external/lib/modules/external/mod-simple.ko"]="mod-simple.ko"
     ["test-modinfo/fallback$MODULE_FALLBACK_DIRECTORY/4.4.4/kernel/"]="mod-simple.ko"
+    ["test-modinfo/fallback-custom$MODULE_FALLBACK_DIRECTORY/3.3.3/kernel/"]="mod-simple.ko"
     ["test-weakdep$MODULE_DIRECTORY/4.4.4/kernel/mod-loop-a.ko"]="mod-loop-a.ko"
     ["test-weakdep$MODULE_DIRECTORY/4.4.4/kernel/mod-loop-b.ko"]="mod-loop-b.ko"
     ["test-weakdep$MODULE_DIRECTORY/4.4.4/kernel/mod-simple.ko"]="mod-simple.ko"

testsuite/rootfs-pristine/test-modinfo/correct-fallback-custom.txt

@@ -0,0 +1 @@
+/run/modules/3.3.3/kernel/mod-simple.ko

testsuite/rootfs-pristine/test-modinfo/fallback-custom/run/modules/3.3.3/modules.alias

@@ -0,0 +1 @@
+# Aliases extracted from modules themselves.

testsuite/rootfs-pristine/test-modinfo/fallback-custom/run/modules/3.3.3/modules.dep

@@ -0,0 +1 @@
+kernel/mod-simple.ko:

testsuite/rootfs-pristine/test-modinfo/fallback-custom/run/modules/3.3.3/modules.devname

@@ -0,0 +1 @@
+# Device nodes to trigger on-demand module loading.

testsuite/rootfs-pristine/test-modinfo/fallback-custom/run/modules/3.3.3/modules.softdep

@@ -0,0 +1 @@
+# Soft dependencies extracted from modules themselves.

testsuite/rootfs-pristine/test-modinfo/fallback-custom/run/modules/3.3.3/modules.symbols

@@ -0,0 +1 @@
+# Aliases for symbols, used by symbol_request().

testsuite/test-modinfo.c

@@ -147,5 +147,30 @@ DEFINE_TEST(test_modinfo_fallback,
 		.out = TESTSUITE_ROOTFS "test-modinfo/correct-fallback.txt",
 	})
 
+static noreturn int test_modinfo_fallback_custom(const struct test *t)
+{
+	const char *const args[] = {
+		// clang-format off
+		progname,
+		"-F", "filename",
+		"--set-version",
+		"3.3.3",
+		"mod-simple",
+		NULL,
+		// clang-format on
+	};
+	test_spawn_prog(progname, args);
+	exit(EXIT_FAILURE);
+}
+DEFINE_TEST(test_modinfo_fallback_custom,
+	.description = "check if modinfo finds external module",
+	.config = {
+		[TC_ROOTFS] = TESTSUITE_ROOTFS "test-modinfo/fallback-custom",
+		[TC_UNAME_R] = "4.4.4",
+	},
+	.output = {
+		.out = TESTSUITE_ROOTFS "test-modinfo/correct-fallback-custom.txt",
+	})
+
 
 TESTSUITE_MAIN();