Adapt Dockerfile to run docker tests inside docker

Dockerfile

@@ -1,5 +1,5 @@
 # This file describes the standard way to build Docker, using docker
-docker-version 0.4.2
+docker-version 0.6.1
 from	ubuntu:12.04
 maintainer	Solomon Hykes <solomon@dotcloud.com>
 # Build dependencies
@@ -23,6 +23,9 @@ run	apt-get install -y -q python-pip
 run	pip install s3cmd
 run	pip install python-magic
 run	/bin/echo -e '[default]\naccess_key=$AWS_ACCESS_KEY\nsecret_key=$AWS_SECRET_KEY\n' > /.s3cfg
+# Runtime dependencies
+run	apt-get install -y -q iptables
+run	apt-get install -y -q lxc
 # Download dependencies
 run	PKG=github.com/kr/pty REV=27435c699;		 git clone http://$PKG /go/src/$PKG && cd /go/src/$PKG && git checkout -f $REV
 run	PKG=github.com/gorilla/context/ REV=708054d61e5; git clone http://$PKG /go/src/$PKG && cd /go/src/$PKG && git checkout -f $REV
@@ -32,6 +35,10 @@ run	PKG=code.google.com/p/go.net/ REV=84a4013f96e0;  hg  clone http://$PKG /go/s
 # Upload docker source
 add	.       /go/src/github.com/dotcloud/docker
 run	ln -s	/go/src/github.com/dotcloud/docker /src
+volume	/var/lib/docker
 # Build the binary
 run	cd /go/src/github.com/dotcloud/docker && hack/release/make.sh
+workdir	/go/src/github.com/dotcloud/docker
+# Wrap all commands in the "docker-in-docker" script to allow nested containers
+entrypoint ["hack/dind"]
 cmd	cd /go/src/github.com/dotcloud/docker && hack/release/release.sh

hack/dind

@@ -53,4 +53,7 @@ do
 done
 popd
 
+# Mount /tmp
+mount -t tmpfs none /tmp
+
 exec $*