server_runner

#!/bin/bash
asRoot=""
notAsRoot="sudo -u ais"
cd "/home/ais/go/src/github.com/tormol/AIS/"
binPath='./ais_server'
go='GOPATH=/usr/local/go/src:/home/ais/go /usr/local/go/bin/go'
git='HOME=/home/ais git'
while true; do # restart after crashes
	$notAsRoot $git pull origin master # try with old code if failed
	filesInMain=`find server -maxdepth 1 -name '*.go' -not -name '*_test.go'`
	$notAsRoot $go build -o "$binPath" $filesInMain	# try with old binary if failed
	# allow binary to listen on any port without being root
	$asRoot setcap CAP_NET_BIND_SERVICE=+eip "$binPath" || break

	#$asRoot ufw allow 80/tcp
	#$asRoot ufw allow 23
	started_u=`date '+%s'` # %s is UNIX timestamp
	started=`date '+%Y-%m-%d %H:%M'` # 2017-03-31 18:39
	echo -e "\n\nStarted on $started" >&2
	$notAsRoot "$binPath" $@ >/dev/null
	crashed_u=`date '+%s'`
	#$asRoot ufw deny 23
	#$asRoot ufw deny 80/tcp
	if [[ $(($crashed_u-$started_u)) -le 60 ]]; then # avoid crash loop
		break
	fi
done
echo 'Stopping!' >&2