#!/bin/bash
set -e

# Warn if the DOCKER_HOST socket does not exist
if [[ $DOCKER_HOST = unix://* ]]; then
	socket_file=${DOCKER_HOST#unix://}
	if ! [ -S $socket_file ]; then
		cat >&2 <<-EOT
			ERROR: you need to share your Docker host socket with a volume at $socket_file
			Typically you should run your jwilder/nginx-proxy with: \`-v /var/run/docker.sock:$socket_file:ro\`
			See the documentation at http://git.io/vZaGJ
		EOT
		socketMissing=1
	fi
fi

# Generate dhparam file if required
# Note: if $DHPARAM_BITS is not defined, generate-dhparam.sh will use 2048 as a default
# Note2: if $DHPARAM_GENERATION is set to false in environment variable, dh param generator will skip completely
/app/generate-dhparam.sh $DHPARAM_BITS $DHPARAM_GENERATION

# Compute the DNS resolvers for use in the templates - if the IP contains ":", it's IPv6 and must be enclosed in []
export RESOLVERS=$(awk '$1 == "nameserver" {print ($2 ~ ":")? "["$2"]": $2}' ORS=' ' /etc/resolv.conf | sed 's/ *$//g')
if [ "x$RESOLVERS" = "x" ]; then
    echo "Warning: unable to determine DNS resolvers for nginx" >&2
    unset RESOLVERS
fi

# If the user has run the default command and the socket doesn't exist, fail
if [ "$socketMissing" = 1 -a "$1" = forego -a "$2" = start -a "$3" = '-r' ]; then
	exit 1
fi

# alias host machine IP if not already present
DOCKER_HOST_IP=$(dig +short -4 host.docker.internal)
if [[ -z $DOCKER_HOST_IP ]]; then
  echo "host.docker.internal not resolved, attempting to identify docker host ip..."
  DOCKER_HOST_IP=`/sbin/ip route|awk '/default/ { print $3 }'`
  echo "found host.docker.internal at $DOCKER_HOST_IP, adding to /etc/hosts..."
  echo "$DOCKER_HOST_IP	host.docker.internal" >> /etc/hosts
  echo "$DOCKER_HOST_IP	docker.for.mac.localhost" >> /etc/hosts
  echo "$DOCKER_HOST_IP	docker.for.win.localhost" >> /etc/hosts
else
  echo "host.docker.internal resolved to $DOCKER_HOST_IP, not modifying /etc/hosts"
fi

exec "$@"