#!/bin/bash
#
# This script is designed to be run inside the container
#

# fail hard and fast even on pipelines
set -eo pipefail

if [[ -f /etc/environment_proxy ]]; then
	source /etc/environment_proxy
fi

# set debug based on envvar
[[ $DEBUG ]] && set -x

# configure etcd
export ETCD_PORT=${ETCD_PORT:-4001}
export ETCD="$HOST:$ETCD_PORT"
export ETCD_PATH=${ETCD_PATH:-/deis/builder}
export ETCD_TTL=${ETCD_TTL:-10}

# wait for etcd to be available
until etcdctl --no-sync -C $ETCD ls >/dev/null 2>&1; do
	echo "waiting for etcd at $ETCD..."
	sleep $(($ETCD_TTL/2))  # sleep for half the TTL
done

# wait until etcd has discarded potentially stale values
sleep $(($ETCD_TTL+1))

function etcd_safe_mkdir {
	set +e
	etcdctl --no-sync -C $ETCD mkdir $1 >/dev/null 2>&1
	if [[ $? -ne 0 && $? -ne 4 ]]; then
		echo "etcd_safe_mkdir: an etcd error occurred. aborting..."
		exit 1
	fi
	set -e
}

etcd_safe_mkdir $ETCD_PATH/users

# wait for confd to run once and install initial templates
until confd -onetime -node $ETCD --confdir /app --log-level error; do
	echo "builder: waiting for confd to write initial templates..."
	sleep $(($ETCD_TTL/2))  # sleep for half the TTL
done

# spawn confd in the background to update services based on etcd changes
confd -node $ETCD --confdir /app --log-level error --interval 5 &
CONFD_PID=$!

# remove any pre-existing docker.sock
test -e /var/run/docker.sock && rm -f /var/run/docker.sock

# force overlayfs if the Docker daemon on the host is using it
mkdir --parents --mode=0700 /
fstype=$(findmnt --noheadings --output FSTYPE --target /)
if [[ "$fstype" == "overlay" ]]; then
	DRIVER_OVERRIDE="--storage-driver=overlay"
fi

# spawn a docker daemon to run builds
docker -d --bip=172.19.42.1/16 $DRIVER_OVERRIDE --insecure-registry 10.0.0.0/8 --insecure-registry 172.16.0.0/12 --insecure-registry 192.168.0.0/16 --insecure-registry 100.64.0.0/10 &
DOCKER_PID=$!

# wait for docker to start
while [[ ! -e /var/run/docker.sock ]]; do
  sleep 1
done

# HACK: load progrium/cedarish tarball for faster boot times
# see https://github.com/deis/deis/issues/1027
if ! docker history progrium/cedarish >/dev/null 2>/dev/null ; then
    echo "Loading cedarish..."
    cat /progrium_cedarish.tar.gz | docker import - progrium/cedarish
else
    echo "Cedarish already loaded"
fi

# build required images
docker build -t deis/slugbuilder /app/slugbuilder/
docker build -t deis/slugrunner /app/slugrunner/

# start an SSH daemon to process `git push` requests
/usr/sbin/sshd -D -e &
SSHD_PID=$!

# smart shutdown on SIGINT and SIGTERM
function on_exit() {
	kill -TERM $DOCKER_PID $SSHD_PID
	wait $DOCKER_PID $SSHD_PID 2>/dev/null
	exit 0
}
trap on_exit INT TERM EXIT

echo deis-builder running...

# publish the service to etcd using the injected EXTERNAL_PORT
if [[ ! -z $EXTERNAL_PORT ]]; then

	# configure service discovery
	PORT=${PORT:-22}
	PROTO=${PROTO:-tcp}

	set +e

	# wait for the service to become available on PORT
	sleep 1 && while [[ -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PORT\" && \$1 ~ \"$PROTO.?\"") ]] ; do sleep 1; done

	# while the port is listening, publish to etcd
	while [[ ! -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PORT\" && \$1 ~ \"$PROTO.?\"") ]] ; do
		etcdctl --no-sync -C $ETCD set $ETCD_PATH/host $HOST --ttl $ETCD_TTL >/dev/null
		etcdctl --no-sync -C $ETCD set $ETCD_PATH/port $EXTERNAL_PORT --ttl $ETCD_TTL >/dev/null
		sleep $(($ETCD_TTL/2)) # sleep for half the TTL
	done

	# if the loop quits, something went wrong
	exit 1

fi

wait