P2Pool auto restart

#!/bin/bash
P2POOL_DIR=~/p2pool
EXISTINGPID=`pgrep -f run_p2pool.py -U bitcoin`

cd $P2POOL_DIR
if git pull | grep -q 'Already up-to-date'; then
        if [[ ! -z "$EXISTINGPID" ]]; then
                echo "No restart needed for p2pool"
        else
                echo "No update for p2pool but found no running instance, launching..."
                ../pool.sh
        fi
else
        echo "Starting new p2pool"
        ../pool.sh
        if [[ ! -z "$EXISTINGPID" ]]; then
                echo "Waiting for new p2pool to be ready"
                sleep 90
                echo "Killing old p2pool"
                kill $EXISTINGPID
        fi
fi