Add AWS build support

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>

alpine/packages/aws/etc/init.d/aws

@@ -0,0 +1,68 @@
+#!/sbin/openrc-run
+
+description="Bootstrap procedure if running on Docker for AWS"
+
+depend()
+{
+	need docker
+}
+
+start()
+{
+	[ "$(mobyplatform)" != "aws" ] && exit 0
+	ebegin "Running AWS-specific initialization"
+
+	INSTANCE_DATA_ENDPOINT=http://169.254.169.254/latest
+	METADATA="${INSTANCE_DATA_ENDPOINT}/meta-data"
+	USERDATA="${INSTANCE_DATA_ENDPOINT}/user-data"
+
+	USER_SSH_DIR=/home/docker/.ssh
+
+	# setup SSH keys
+	if [ ! -d ${USER_SSH_DIR} ]
+	then
+		mkdir -p ${USER_SSH_DIR}
+		chmod 700 ${USER_SSH_DIR}
+	fi
+
+	# Put instance SSH key in place.
+	wget -q -O /tmp/my-key ${METADATA}/public-keys/0/openssh-key &>/dev/null
+	if [ $? -eq 0 ]
+	then
+		cat /tmp/my-key >> ${USER_SSH_DIR}/authorized_keys
+		chmod 700 ${USER_SSH_DIR}/authorized_keys
+		rm /tmp/my-key
+	else
+		echo "No SSH public key found to add to instance"
+	fi
+
+	# TODO: The docker user should be given more permissions on FS by
+	# default, this is temporary hack
+	chown -R docker /home/docker
+	chgrp -R docker /home/docker
+	chown -R docker /var/log
+	chgrp -R docker /var/log
+	passwd -u docker
+
+	HOSTNAME=$(wget -qO- ${METADATA}/local-hostname)
+
+	# Set hostname based on what AWS tells us it should be.
+	echo ${HOSTNAME} >/etc/hostname
+	hostname -F /etc/hostname
+
+	# Needed for ELB integration.
+	mkdir -p /var/lib/docker/swarm
+
+	# Get user data file and use it to bootstrap Moby in the cloud
+	wget -q -O /tmp/user-data ${USERDATA}/
+
+	# For now we will have a shell script which executes on boot.
+	# TODO(nathanleclaire/kencochrane): Migrate this to mobyconfig, or similar.
+	if [ $? -eq 0 ]
+	then
+		chmod 755 /tmp/user-data
+		/tmp/user-data
+	fi
+
+	eend 0
+}