dockerize (work in progress)

Docker support was initially worked on in 2bbb7a5e7e, but it never really worked.

This extends f7d7434012800c3572049af82a501743d4aed583 which was an old branch for docker work.

setup/functions.sh

@@ -70,12 +70,20 @@ function get_default_hostname {
 	# Guess the machine's hostname. It should be a fully qualified
 	# domain name suitable for DNS. None of these calls may provide
 	# the right value, but it's the best guess we can make.
-	set -- $(hostname --fqdn      2>/dev/null ||
-                 hostname --all-fqdns 2>/dev/null ||
-                 hostname             2>/dev/null)
+	set -- $(
+		get_hostname_from_reversedns ||
+		hostname --fqdn      2>/dev/null ||
+		hostname --all-fqdns 2>/dev/null ||
+		hostname             2>/dev/null)
 	printf '%s\n' "$1" # return this value
 }
 
+function get_hostname_from_reversedns {
+	# Do a reverse DNS lookup on our public IPv4 address. The output of
+	# `host` is complex -- use sed to get the FDQN.
+	host $(get_publicip_from_web_service 4) | sed "s/.*pointer \(.*\)\./\1/"
+}
+
 function get_publicip_from_web_service {
 	# This seems to be the most reliable way to determine the
 	# machine's public IP address: asking a very nice web API
@@ -151,7 +159,25 @@ function ufw_allow {
 }
 
 function restart_service {
-	hide_output service $1 restart
+	# Restart a service quietly.
+	if [ ! "$IS_DOCKER" ]; then
+		# The normal way to restart a service.
+		hide_output service $1 restart
+	else
+ 		# On docker, sysvinit is not present. Our base image provides
+ 		# a weird way to manage running services. But we're not going
+ 		# to use it. Just execute the init.d script directly.
+
+	 	if [ "$1" == "dovecot" ]; then
+			# Dovecot does not provide an init.d script. It just provides
+			# an upstart init configuration. But Docker doesn't provide
+			# upstart. Start Dovecot specially.
+			killall dovecot
+			dovecot -c /etc/dovecot/dovecot.conf
+		else
+	 		hide_output /etc/init.d/$1 restart
+	 	fi
+	fi
 }
 
 ## Dialog Functions ##

setup/preflight.sh

@@ -4,7 +4,7 @@ if [[ $EUID -ne 0 ]]; then
 	echo
 	echo "sudo $0"
 	echo
-	exit
+	exit 1
 fi
 
 # Check that we are running on Ubuntu 14.04 LTS (or 14.04.xx).
@@ -14,7 +14,7 @@ if [ "`lsb_release -d | sed 's/.*:\s*//' | sed 's/14\.04\.[0-9]/14.04/' `" != "U
 	lsb_release -d | sed 's/.*:\s*//'
 	echo
 	echo "We can't write scripts that run on every possible setup, sorry."
-	exit
+	exit 1
 fi
 
 # Check that we have enough memory.
@@ -30,6 +30,6 @@ if [ ! -d /vagrant ]; then
 	echo "Your Mail-in-a-Box needs more memory (RAM) to function properly."
 	echo "Please provision a machine with at least 768 MB, 1 GB recommended."
 	echo "This machine has $TOTAL_PHYSICAL_MEM MB memory."
-	exit
+	exit 1
 fi
 fi

setup/start.sh

@@ -59,7 +59,11 @@ if [ "$PUBLIC_IPV6" = "auto" ]; then
 	# Use a public API to get our public IPv6 address, or fall back to local network configuration.
 	PUBLIC_IPV6=$(get_publicip_from_web_service 6 || get_default_privateip 6)
 fi
-if [ "$PRIMARY_HOSTNAME" = "auto-easy" ]; then
+if [ "$PRIMARY_HOSTNAME" = "auto" ]; then
+	# Use reverse DNS to get this machine's hostname. Install bind9-host early.
+	hide_output apt-get -y install bind9-host
+	PRIMARY_HOSTNAME=$(get_default_hostname)
+elif [ "$PRIMARY_HOSTNAME" = "auto-easy" ]; then
 	# Generate a probably-unique subdomain under our justtesting.email domain.
 	PRIMARY_HOSTNAME=`echo $PUBLIC_IP | sha1sum | cut -c1-5`.justtesting.email
 fi