make incoming work via ssh (issue139); move chunk code into separate module. Incoming ssh needs to detect the end of the changegroup, otherwise it would block trying to read from the ssh pipe. This is done by parsing the changegroup chunks. bundlerepo.getchunk() already is identical to localrepo.addchangegroup.getchunk(), which is followed by getgroup which looks much like what you can re-use in bundlerepository.__init__() and in write_bundle(). bundlerevlog.__init__.genchunk() looks very similar, too, as do some while loops in localrepo.py. Applied patch from Benoit Boissinot to move duplicate/related code to mercurial/changegroup.py and use this to fix incoming ssh.

#!/bin/sh

mkdir t
cd t
hg init
echo import > port
hg add port
hg commit -m 0 -u spam -d '0 0'
echo export >> port
hg commit -m 1 -u eggs -d '1 0'
echo export > port
echo vaportight >> port
echo 'import/export' >> port
hg commit -m 2 -u spam -d '2 0'
echo 'import/export' >> port
hg commit -m 3 -u eggs -d '3 0'
head -n 3 port > port1
mv port1 port
hg commit -m 4 -u spam -d '4 0'
hg grep port port
echo 'FIXME: history is wrong here'
hg grep --all -nu port port
hg grep import port