run_local_squid_proxy.sh

#!/bin/bash

SQUID_DOCKER_IMAGE="sameersbn/squid"
SQUID_DOCKER_VERSION="3.3.8-23"
SQUID_DOCKER_FQN="$SQUID_DOCKER_IMAGE:$SQUID_DOCKER_VERSION"
CONTAINER_NAME="squid"

function pull_image_if_missing() {
  docker inspect $SQUID_DOCKER_FQN &> /dev/null
  image_exists=$?

  if [ "$image_exists" -eq 0 ]; then
    echo "Docker image already exists."
  else
    echo "Could not find docker image."
    docker pull $SQUID_DOCKER_IMAGE:$SQUID_DOCKER_VERSION
    echo "Pulled docker image $SQUID_DOCKER_IMAGE:$SQUID_DOCKER_VERSION"
  fi
}

function start_container_unless_running() {
  docker ps -f name=$CONTAINER_NAME | grep $CONTAINER_NAME &> /dev/null
  is_running=$?

  if [ "$is_running" -eq 0 ]; then
    echo "Squid container is already running."
  else
    echo "Starting squid container.."
    docker run --name $CONTAINER_NAME \
      -d \
      --restart=always \
      --publish 3128:3128 \
      $SQUID_DOCKER_IMAGE:$SQUID_DOCKER_VERSION
    sleep 5 # sleep 5 seconds to let it start before we tail
  fi
}

function tail_logs() {
  echo "Tailing logs.. be sure to set:"
  echo ""
  echo "  export http_proxy=http://localhost:3128"
  echo "  export https_proxy=http://localhost:3128"
  echo "  export HTTP_PROXY=http://localhost:3128"
  echo "  export HTTPS_PROXY=http://localhost:3128"
  echo ""
  docker exec -it $CONTAINER_NAME tail -f /var/log/squid3/access.log
}

pull_image_if_missing && start_container_unless_running && tail_logs