#!/bin/bash

 set -e

 # DinD: a wrapper script which allows docker to be run inside a docker container.

 # Original version by Jerome Petazzoni <jerome@docker.com>

 # See the blog post: https://blog.docker.com/2013/09/docker-can-now-run-within-docker/

 #
 # This script should be executed inside a docker container in privilieged mode

 # ('docker run --privileged', introduced in docker 0.6).

 
 # Usage: dind CMD [ARG...]
 

 # apparmor sucks and Docker needs to know that it's in a container (c) @tianon
 export container=docker
 

 if [ -d /sys/kernel/security ] && ! mountpoint -q /sys/kernel/security; then
 	mount -t securityfs none /sys/kernel/security || {
 		echo >&2 'Could not mount /sys/kernel/security.'

 		echo >&2 'AppArmor detection and --privileged mode might break.'

 	}

 fi
 

 # Mount /tmp (conditionally)
 if ! mountpoint -q /tmp; then
 	mount -t tmpfs none /tmp
 fi

 if [ $# -gt 0 ]; then
 	exec "$@"
 fi
 
 echo >&2 'ERROR: No command specified.'
 echo >&2 'You probably want to run hack/make.sh, or maybe a shell?'