add 'debugrebuildstate' to rebuild the dirstate from a given revision - added and removed files will be lost while recreating the dirstate - modifications are not lost

#!/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