selftests/nolibc: prepare /tmp for tests that need to write

create a /tmp directory. If it succeeds, the directory is writable,
which is normally the case when booted from an initramfs anyway.

This will be used instead of procfs for some tests.

Reviewed-by: Thomas Weißschuh <[email protected]>
Signed-off-by: Zhangjin Wu <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/
[wt: removed the unneeded mount() call]
Signed-off-by: Willy Tarreau <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 55cc2296c292..bc2f40c9cee6 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -1064,6 +1064,9 @@ int prepare(void)
 		}
 	}
 
+	/* some tests rely on a writable /tmp */
+	mkdir("/tmp", 0755);
+
 	return 0;
 }