Reduce string duplication in compression code This cuts down on string copies and allows buffers (instead of strings) to be passed into the compression code

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 1
kill -HUP $P
sleep 1
ls .hg