one you get when using openat-enabled fts.c and du (coming soon).
# This must exit nonzero.
chmod -R o=r d >/dev/null 2>out && fail=1
+
cat <<\EOF > exp
chmod: `d/no-x': Permission denied
EOF
-cmp out exp || fail=1
+# With native openat, du uses a different code path.
+cat <<\EOF > exp-native-openat
+chmod: cannot access `d/no-x/y': Permission denied
+chmod: fts_read failed: Permission denied
+EOF
+
+if cmp out exp >/dev/null 2>&1; then
+ :
+else
+ if cmp out exp-native-openat; then
+ :
+ else
+ fail=1
+ fi
+fi
+
test $fail = 1 && diff out exp 2> /dev/null
(exit $fail); exit $fail