pseudo ci, lol.

gistfile1.txt

#!/usr/bin/env bash                                                                                                                    
set -m
[ -f post-receive.pid ] && kill `cat post-receive.pid` &>/dev/null
echo $$ > post-receive.pid
trap 'kill %%; exit 1' EXIT

APIKEY=somekey

while true
do
        echo "Waiting for request."
        echo -ne "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nOK" \
                | nc -l 3000 -q -1 \
                | grep "$APIKEY" \
                && git fetch \
                && git reset --hard origin/master \
                && rake || echo "Build failed" | mail some@mail.tld
done