Handle a nonexistent repository with a 404 error. Based on changeset 62ea868cafbfa3acb7e5dba6982ecb46a1637246 from Vincent Wagelaar <vincent@ricardis.tudelft.nl> in http://hannibal.lr-s.tudelft.nl/~vincent/fcgi

#!/bin/sh

mkdir a
cd a
hg init
echo 123 > a
hg add a
hg commit -m "a" -u a -d "0 0"

cd ..
mkdir b
cd b
hg init 
echo 321 > b
hg add b
hg commit -m "b" -u b -d "0 0"

hg pull ../a
hg heads