Script for polling bzzd.ipc when starting swarm

startswarm.sh

#!/bin/bash

function killswarm {
	kill -TERM $1
	exit 1
}

# take the newest key if none is given
function latest_key {
	echo -n `find $1/keystore -regex ".*--[a-fA-F0-9].*" | sort -r | head -n1 | sed -e 's/.*Z--\([a-fA-F0-9]*\)$/\1/g'`
}

while test $# != 0
do 
	case "$1" in
		-d) args_d=$2; shift;; #datadir
		-a) args_a=$2; shift;; #account
		-e) args_e=$2; shift;; #ens-api path
		-p) args_p=$2; shift;; #p2p port
		-x) args_x=$2; shift;; #command to run after ipc is up
		*) break;;
	esac
	shift
done

DATADIR=${args_d:-~/.ethereum}

if [ ! -d $DATADIR ]; then
	>&2 echo "Datadir $DATADIR does not exist"
	exit 1
fi

ACCOUNT=${args_a:-$(latest_key $DATADIR)}

SWARM=$GOPATH/bin/swarm
ETHAPI=${args_e}
PORT=${args_p:+" --port $args_p"}

args=(
	--bzzaccount	"${ACCOUNT}"
	--datadir	"${DATADIR}"
	--ens-api	"${args_e}"
	$PORT
)

function ipcexec {
	if [ ! -z ${args_x} ]; then
		${args_x} ${DATADIR} ${ACCOUNT}
		exit $?
	fi
}

($SWARM "${args[@]}" < pass) & 

for i in {1..5}; do
	if [ -e $DATADIR/bzzd.ipc ]; then
		ipcowner=`lsof -t $DATADIR/bzzd.ipc`
		if [ "$!" == "$ipcowner" ]; then
			ipcexec && exit 0
		else
			if [ ! -z ${ipcowner} ]; then 
				>&2 echo "Process ${ipcowner} already owns the this socket, exiting..." && killswarm $!
			fi
		fi
	fi
	>&2 echo "polling bzzd.ipc"
	sleep 1
done

>&2 echo "gave up waiting for ipc, killing swarm"
killswarm $!