selftests: openat2: port emptypath_test to kselftest harness

Convert the emptypath selftests to the
FIXTURE_SETUP()/FIXTURE_TEARDOWN() and the two checks become TEST_F()s.
No change in coverage.

Link: https://patch.msgid.link/20260521-wettstreit-meinen-46271dede480@brauner
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

1 files changed, 57 insertions, 35 deletions

diff --git a/tools/testing/selftests/filesystems/openat2/emptypath_test.c b/tools/testing/selftests/filesystems/openat2/emptypath_test.c
index d75b5e998ff9..be37ccba57ec 100644
--- a/tools/testing/selftests/filesystems/openat2/emptypath_test.c
+++ b/tools/testing/selftests/filesystems/openat2/emptypath_test.c
@@ -1,55 +1,77 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#define _GNU_SOURCE
 #define __SANE_USERSPACE_TYPES__
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
 
-#include "kselftest.h"
+#include "kselftest_harness.h"
 
 #ifndef O_EMPTYPATH
 #define O_EMPTYPATH	(1 << 26)
 #endif
 
-int main(void)
+#define EMPTYPATH_TEST_FILE "/tmp/emptypath_test"
+
+FIXTURE(emptypath) {
+	int opath_fd;
+};
+
+FIXTURE_SETUP(emptypath)
 {
-	int opath_fd, reopen_fd;
-	const char *path = "/tmp/emptypath_test";
-
-	ksft_print_header();
-	ksft_set_plan(2);
-
-	opath_fd = open(path, O_CREAT | O_WRONLY, S_IRWXU);
-	if (opath_fd < 0)
-		ksft_exit_fail_msg("create %s: %m\n", path);
-	close(opath_fd);
-
-	opath_fd = open(path, O_PATH);
-	if (opath_fd < 0)
-		ksft_exit_fail_msg("open %s O_PATH: %m\n", path);
-
-	reopen_fd = openat(opath_fd, "", O_RDONLY);
-	if (reopen_fd < 0 && errno == ENOENT)
-		ksft_test_result_pass("empty path without O_EMPTYPATH returns ENOENT\n");
-	else if (reopen_fd >= 0) {
-		ksft_test_result_fail("empty path without O_EMPTYPATH unexpectedly succeeded\n");
-		close(reopen_fd);
-	} else {
-		ksft_test_result_fail("empty path without O_EMPTYPATH: expected ENOENT, got %m\n");
+	int fd;
+
+	self->opath_fd = -1;
+
+	fd = open(EMPTYPATH_TEST_FILE, O_CREAT | O_WRONLY, S_IRWXU);
+	ASSERT_GE(fd, 0) {
+		TH_LOG("create %s: %s", EMPTYPATH_TEST_FILE, strerror(errno));
 	}
+	close(fd);
 
-	reopen_fd = openat(opath_fd, "", O_RDONLY | O_EMPTYPATH);
+	self->opath_fd = open(EMPTYPATH_TEST_FILE, O_PATH);
+	ASSERT_GE(self->opath_fd, 0) {
+		TH_LOG("open %s O_PATH: %s", EMPTYPATH_TEST_FILE, strerror(errno));
+	}
+}
 
-	if (reopen_fd < 0 && errno == EINVAL)
-		ksft_exit_skip("O_EMPTYPATH not supported\n");
+FIXTURE_TEARDOWN(emptypath)
+{
+	if (self->opath_fd >= 0)
+		close(self->opath_fd);
+	unlink(EMPTYPATH_TEST_FILE);
+}
 
-	if (reopen_fd >= 0) {
-		ksft_test_result_pass("O_EMPTYPATH reopens O_PATH fd\n");
-		close(reopen_fd);
-	} else {
-		ksft_test_result_fail("O_EMPTYPATH failed: %m\n");
+/* An empty path is rejected with ENOENT unless O_EMPTYPATH is set. */
+TEST_F(emptypath, without_flag_returns_enoent)
+{
+	int fd = openat(self->opath_fd, "", O_RDONLY);
+
+	if (fd >= 0)
+		close(fd);
+	ASSERT_LT(fd, 0) {
+		TH_LOG("empty path without O_EMPTYPATH unexpectedly succeeded");
+	}
+	EXPECT_EQ(errno, ENOENT) {
+		TH_LOG("expected ENOENT, got %s", strerror(errno));
 	}
+}
+
+/* O_EMPTYPATH reopens the O_PATH fd through an empty path. */
+TEST_F(emptypath, reopens_opath_fd)
+{
+	int fd = openat(self->opath_fd, "", O_RDONLY | O_EMPTYPATH);
+
+	if (fd < 0 && errno == EINVAL)
+		SKIP(return, "O_EMPTYPATH not supported");
 
-	unlink(path);
-	ksft_finished();
+	ASSERT_GE(fd, 0) {
+		TH_LOG("O_EMPTYPATH failed: %s", strerror(errno));
+	}
+	close(fd);
 }
+
+TEST_HARNESS_MAIN