WVPASS "$top/t/compare-trees" -c src/ restore/src/
WVSTART "sparse file restore --sparse (short zero runs around boundary)"
-WVPASS python > src/foo <<EOF
+WVPASS bup-python > src/foo <<EOF
from sys import stdout
stdout.write("x" * 65535 + "\0")
stdout.write("\0" + "x" * 65535)