[PATCH v5 1/2] selftests: tmpfs: Add Test-fail if not run as root

[Shivam Chaudhary <cvam0000@gmail.com>]

Add 'ksft_exit_fail_msg()', if  not run as root, with an appropriate
Warning.

Add 'ksft_print_header()' and 'ksft_set_plan()' to structure test
outputs more effectively.

Test logs:

Before Change:
- Without root
 error: unshare, errno 1

- With root
 No, output

After Change:
- Without root
TAP version 13
1..1
Bail out! Error : Need to run as root# Planned tests != run tests (1 != 0)

- With root
TAP version 13
1..1

Signed-off-by: Shivam Chaudhary <cvam0000@gmail.com>
---
 tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c
index b5c3ddb90942..f0b36e7a152e 100644
--- a/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c
+++ b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c
@@ -23,10 +23,21 @@
 #include <sys/mount.h>
 #include <unistd.h>
 
+#include "../kselftest.h"
+
 int main(void)
 {
 	int fd;
 
+	/* Setting up kselftest framework */
+	ksft_print_header();
+	ksft_set_plan(1);
+
+	/* Check if test is run as root */
+	if (geteuid()) {
+		ksft_exit_fail_msg("Error : Need to run as root");
+	}
+
 	if (unshare(CLONE_NEWNS) == -1) {
 		if (errno == ENOSYS || errno == EPERM) {
 			fprintf(stderr, "error: unshare, errno %d\n", errno);
-- 
2.45.2