#!/bin/bash -e
# Usage: ./docker-local-hosts.sh containername mylocalname

# Get IP of container and strip newlines.
INSPECT=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' $1)
IP=${INSPECT//[$'\t\r\n']}

if test -z "$IP"; then
  echo "Container IP for $1 not found."
  exit
fi

# Get hostname or use container name as default.
HOSTNAME="${2:-$1}"

# Remove line with previous container.
sudo sed -i "/\s#$1/d" /etc/hosts

# Add new hosts line.
echo "$IP $HOSTNAME #$1" | sudo tee -a /etc/hosts