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function init() {
	if [ "$V" == "1" ]; then
		set -v
	fi

	export UTILDIR=$( realpath `dirname "${BASH_SOURCE[0]}"` )
	export TESTDIR=$( realpath "$UTILDIR"/../ )
	cd ${TESTDIR}

	# Set traps to kill our subprocesses when we exit (for any reason).
	trap ":" TERM      # Avoid the EXIT handler from killing bash.
	trap "exit 2" INT  # Ctrl-C, make sure we fail in that case.
	trap "kill 0" EXIT # Kill children on exit.

	export GOCOVERDIR
}

function build() {
	if [ "$GOCOVERDIR" != "" ]; then
		(
			cd ..
			go build -cover -covermode=count -o gofer .
		)
	else
		( cd ..; make )
	fi
	( cd util/exp; go build )
}

function gofer() {
	../gofer "$@" >> .out.log 2>&1
}

# Run gofer in the background (sets $PID to its process id).
function gofer_bg() {
	# Duplicate gofer() because if we put the function in the background,
	# the pid will be of bash, not the subprocess.
	../gofer "$@" >> .out.log 2>&1 &
	PID=$!
}

function acmesrv() {
	# Remove the cache before launching the ACME server, otherwise clients
	# won't reach out to it.
	rm -rf .autocerts-cache/
	go run ${UTILDIR}/acmesrv/acmesrv.go \
		-addr=localhost:8460 > .acmesrv.log
}

# Wait until there's something listening on the given port.
function wait_until_ready() {
	PORT=$1

	while ! bash -c "true < /dev/tcp/localhost/$PORT" 2>/dev/null ; do
		sleep 0.01
	done
}

function generate_certs() {
	mkdir -p .certs/localhost
	(
		cd .certs/localhost
		go run ${UTILDIR}/generate_cert/generate_cert.go \
			-ca -validfor=1h --host=localhost
	)
}

function exp() {
	if [ "$V" == "1" ]; then
		VF="-v"
	fi
	echo "  $@"

	${UTILDIR}/exp/exp "$@" \
		$VF \
		-cacert="${CACERT:-.certs/localhost/fullchain.pem}"
}

function snoop() {
	if [ "$SNOOP" == "1" ]; then
		read -p"Press enter to continue"
	fi
}

function waitgrep() {
	for i in 0.01 0.02 0.05 0.1 0.2; do
		if grep "$@"; then
				return 0
		fi
		sleep $i
	done
	return 1	
}