docker: don't start services ourself

* let the base image's system services manager handle it
* move our container start script to occur before system services are started

Dockerfile

@@ -5,14 +5,10 @@
 # To build the image:
 # sudo docker.io build -t box .
 
-# Run your container the first time with an interactive console so you can
-# create your first mail account.
-# sudo docker.io run -i -t box
-
-# Then run it in the background and expose all of the ports so that the *host* acts as a Mail-in-a-Box:
-# (the SSH port is only available locally, but other ports are exposed publicly and must be available
-# otherwise the container won't start)
-# sudo docker.io run -d -p 22 -p 25:25 -p 53:53/udp -p 443:443 -p 587:587 -p 993:993 box
+# Run your container.
+#  -i -t: creates an interactive console so you can poke around (CTRL+D will terminate the container)
+#  -p ...: Maps container ports to host ports so that the host begins acting as a Mail-in-a-Box.
+# sudo docker.io run -i -t -p 22 -p 25:25 -p 53:53/udp -p 443:443 -p 587:587 -p 993:993 box
 
 ###########################################
 
@@ -43,6 +39,7 @@ ENV PUBLIC_IP 192.168.200.1
 
 # Docker-specific Mail-in-a-Box configuration.
 ENV DISABLE_FIREWALL 1
+ENV NO_RESTART_SERVICES 1
 
 # Our install will fail if SSH is installed and allows password-based authentication.
 # The base image already installs openssh-server. Just edit its configuration.
@@ -59,6 +56,7 @@ RUN cd /usr/local/mailinabox && scripts/start.sh
 # Configure services for docker.
 ADD containers/docker /usr/local/mailinabox/containers/docker
 RUN /usr/local/mailinabox/containers/docker/setup_services.sh
+RUN ln -s /usr/local/mailinabox/containers/docker/container_start.sh /etc/my_init.d/99-mailinabox.sh
 
-# How the container is launched.
-CMD bash /usr/local/mailinabox/containers/docker/container_start.sh
+# Start bash so we can poke around.
+CMD ["/sbin/my_init", "--", "bash"]

containers/docker/container_start.sh

@@ -15,27 +15,10 @@ if grep "^PUBLIC_IP=192.168.200.1" /etc/mailinabox.conf > /dev/null; then
   export PUBLIC_HOSTNAME=`host $PUBLIC_IP | sed -e "s/.* //" | sed -e "s/\.$//"`
   echo Your hostname is $PUBLIC_HOSTNAME.
 
-  # Start configuration again.
+  # Start configuration again. Hide the terminal. The system services
+  # have not been started yet, so we can't ask the user to create an
+  # account yet.
   cd /usr/local/mailinabox
-  scripts/start.sh
+  scripts/start.sh < /dev/null
 fi
 
-if [ -t 0 ]
-then
-  # This is an interactive shell. You get a command prompt within
-  # the container.
-  #
-  # You get here by running 'docker run -i -t'.
-
-  echo "Welcome to your Mail-in-a-Box."
-  bash
-
-else
-  # This is a non-interactive shell. Just display status. Because
-  # other services are running, the container remains running after
-  # this script exits.
-  #
-  # You get here by omitting '-t' from the docker run arguments.
-
-  echo "Your Mail-in-a-Box is running..."
-fi

scripts/start.sh

@@ -52,6 +52,17 @@ PUBLIC_HOSTNAME=$PUBLIC_HOSTNAME
 PUBLIC_IP=$PUBLIC_IP
 EOF
 
+# For docker, we don't want any of our scripts to start daemons.
+# Mask the 'service' program by defining a function of the same name
+# so that whenever we try to restart a service we just silently do
+# nothing.
+if [ "$NO_RESTART_SERVICES" == "1" ]; then
+	function service {
+		# we could output some status, but it's not important
+		echo skipping service $@ > /dev/null;
+	}
+fi
+
 # Start service configuration.
 . scripts/system.sh
 . scripts/dns.sh