more dockerization work

[From @joshdata: This is part of @toilal's work in #377 and 1eb77c332b. The changes are:

* Separates out the runit configuration from starting Mail-in-a-Box setup so that Mail-in-a-Box setup does not block the starting of runit services and we can assume that runit is running during setup (i.e. we can restart services).
* Adds a SKIP_INSTALL flag so that the container can be restarted without re-running the whole Mail-in-a-Box setup.
* Made containers/docker/run more flexible.
* I'm also adding some "|| exit 0"s to the run script to stop if there are any docker errors.
* I'm also adding the prereqs installs from questions.sh into Dockerfile so we don't have to reinstall each time.

]

containers/docker/tools/configure_services.sh

@@ -0,0 +1,103 @@
+#!/bin/bash
+
+# The phusion/baseimage base image we use for a working Ubuntu
+# replaces the normal Upstart system service management with
+# a ligher-weight service management system called runit that
+# requires a different configuration. We need to create service
+# run files that do not daemonize.
+
+# This removes /etc/init.d service if service exists in runit.
+# It also creates a symlink from /usr/bin/sv to /etc/init.d/$service
+# to support SysV syntax: service $service <command> or /etc/init.d/$service <command>
+SERVICES=/etc/service/*
+for f in $SERVICES
+do
+	service=$(basename "$f")
+	if [ -d /etc/service/$service ]; then
+		if [ -f /etc/init.d/$service ]; then
+			mv /etc/init.d/$service /etc/init.d/$service.lsb
+			chmod -x /etc/init.d/$service.lsb
+		fi
+		ln -s /usr/bin/sv /etc/init.d/$service
+	fi
+done
+
+# Create runit services from sysv services. For most of the services,
+# there is a common pattern we can use: execute the init.d script that
+# the Ubuntu package installs, and then poll for the termination of
+# the daemon.
+function make_runit_service {
+	INITD_NAME=$1
+	WAIT_ON_PROCESS_NAME=$2
+	mkdir -p /etc/service/$INITD_NAME
+	cat > /etc/service/$INITD_NAME/run <<EOF;
+#!/bin/bash
+source /usr/local/mailinabox/setup/functions.sh
+hide_output /etc/init.d/$INITD_NAME restart
+while [ \`ps a -C $WAIT_ON_PROCESS_NAME -o pid= | wc -l\` -gt 0 ]; do
+       sleep 30
+done
+echo $WAIT_ON_PROCESS_NAME died.
+sleep 20
+EOF
+	chmod +x /etc/service/$INITD_NAME/run
+}
+make_runit_service bind9 named
+make_runit_service resolvconf resolvconf
+make_runit_service fail2ban fail2ban
+make_runit_service mailinabox mailinabox-daemon
+make_runit_service memcached memcached
+make_runit_service nginx nginx
+make_runit_service nsd nsd
+make_runit_service opendkim opendkim
+make_runit_service opendmarc opendmarc
+make_runit_service php5-fpm php5-fpm
+make_runit_service postfix postfix
+make_runit_service postgrey postgrey
+make_runit_service spampd spampd
+
+# Dovecot doesn't provide an init.d script, but it does provide
+# a way to launch without daemonization. We wrote a script for
+# that specifically.
+for service in dovecot; do
+	mkdir -p /etc/service/$service
+	cp /usr/local/mailinabox/containers/docker/runit/$service.sh /etc/service/$service/run
+	chmod +x /etc/service/$service/run
+done
+
+# This adds a log/run file on each runit service directory.
+# This file make services stdout/stderr output to svlogd log
+# directory located in /var/log/runit/$service.
+SERVICES=/etc/service/*
+for f in $SERVICES
+do
+	service=$(basename "$f")
+	if [ -d /etc/service/$service ]; then
+		mkdir -p /etc/service/$service/log
+		cat > /etc/service/$service/log/run <<EOF;
+#!/bin/bash
+mkdir -p /var/log/runit
+chmod o-wrx /var/log/runit
+mkdir -p /var/log/runit/$service
+chmod o-wrx /var/log/runit/$service
+exec svlogd -tt /var/log/runit/$service/
+EOF
+		chmod +x /etc/service/$service/log/run
+	fi
+done
+
+# Disable services for now. Until Mail-in-a-Box is installed the
+# services won't be configured right and there would be errors if
+# they got run prematurely.
+SERVICES=/etc/service/*
+for f in $SERVICES
+do
+	service=$(basename "$f")
+	if [ "$service" = "syslog-ng" ]; then continue; fi;
+	if [ "$service" = "syslog-forwarder" ]; then continue; fi;
+	if [ "$service" = "ssh" ]; then continue; fi;
+	if [ "$service" = "cron" ]; then continue; fi;
+	if ([ -d /etc/service/$service ] && [ ! -f /etc/service/$service/down ]); then
+		touch /etc/service/$service/down
+	fi
+done