[PATCH v3 1/5] idmapped-mounts: Reset errno to zero after detect fs_allow_idmap

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If we run case on old kernel that doesn't support mount_setattr and
then fail on our own function before call is_setgid/is_setuid function
to reset errno, run_test will print "Function not implement" error.

Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx>
---
 src/idmapped-mounts/idmapped-mounts.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/idmapped-mounts/idmapped-mounts.c b/src/idmapped-mounts/idmapped-mounts.c
index 4cf6c3bb..8e6405c5 100644
--- a/src/idmapped-mounts/idmapped-mounts.c
+++ b/src/idmapped-mounts/idmapped-mounts.c
@@ -14070,6 +14070,8 @@ int main(int argc, char *argv[])
 		die("failed to open %s", t_mountpoint_scratch);
 
 	t_fs_allow_idmap = fs_allow_idmap();
+	/* don't copy ENOSYS errno to child process on older kernel */
+	errno = 0;
 	if (supported) {
 		/*
 		 * Caller just wants to know whether the filesystem we're on
-- 
2.27.0




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