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test "$SUDO" || skip test "$UNAME" = "Darwin" && skip clean_scratch mkdir scratch/{foo,mnt} sudo mount -t tmpfs tmpfs scratch/mnt ln -s ../mnt scratch/foo/bar "$XTOUCH" scratch/mnt/baz ln -s ../mnt/baz scratch/foo/qux bfs_diff -L scratch -xdev ret=$? sudo umount scratch/mnt return $ret