zeroconf: guess ip for Zeroconf
Zeroconf() is actually pretty dumb in guessing IPs and in case of
socket.gaierror will not guess right IP.
#!/bin/sh
hg init repo
cd repo
touch foo
hg ci -Am 'add foo'
hg up -C null
# this should be stored as a delta against rev 0
echo foo bar baz > foo
hg ci -Am 'add foo again'
hg debugindex .hg/store/data/foo.i