Fixes for Azure hostname and swap disk

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

alpine/packages/automount/etc/init.d/automount

@@ -10,7 +10,24 @@ start()
 {
 	ebegin "Configuring host block device"
 
-	DEV="$(find /dev -maxdepth 1 -type b ! -name 'loop*' | grep -v '[0-9]$' | sed 's@.*/dev/@@' | head -1 )"
+	# We are being specific with Azure for now.  Otherwise the subshell
+	# below will reference /dev/sdb, which is Azure's "local resource disk"
+	# (see
+	# https://blogs.msdn.microsoft.com/mast/2013/12/06/understanding-the-temporary-drive-on-windows-azure-virtual-machines/).
+	#
+	# Since attempting to format swap on that disk will cause Azure VHD
+	# validation to fail, we default to using /dev/sda.  requirements
+	# including not allowing swap partitions.
+	#
+	# IMPORTANT: If this, or the root device (/dev/sda1) changes in the
+	# syslinux / bootloader config for Azure, they will need to be updated
+	# in parallel.
+	if [ "$(mobyplatform)" = "azure" ]
+	then
+		DEV="sda"
+	else
+		DEV="$(find /dev -maxdepth 1 -type b ! -name 'loop*' | grep -v '[0-9]$' | sed 's@.*/dev/@@' | head -1 )"
+	fi
 
 	[ -z "${DEV}" ] && exit 1
 

alpine/packages/azure/etc/init.d/azure

@@ -13,13 +13,6 @@ start()
 	[ "$(mobyplatform)" != "azure" ] && exit 0
 	ebegin "Running Azure-specific initialization"
 
-	einfo "Setting hostname"
-
-	# TODO: This is probably quite fragile (splitting the returned JSON by
-	# quotes instead of properly parsing).  Would bundling 'jq' in Moby be
-	# too much overhead?
-	hostname $(wget -qO- http://169.254.169.254/metadata/v1/instanceinfo | awk -F '"' '{ print $4; }')
-
 	for i in $(seq 1 20)
 	do
 		einfo "Pulling Windows Azure Linux Agent container"
@@ -47,12 +40,15 @@ start()
 		--ipc host \
 		--pid host \
 		--net host \
+		--uts host \
 		--restart unless-stopped \
 		-v /usr/bin/docker:/usr/local/bin/docker:ro \
 		-v /var/run/docker.sock:/var/run/docker.sock \
 		-v /var/log:/var/log \
+		-v /mnt:/mnt \
 		-v /home:/home \
 		-v /etc:/etc \
+		-v /etc/hostname:/etc/hostname \
 		-v /lib/modules:/lib/modules \
 		-v /lib/firmware:/lib/firmware \
 		-v /var/lib/waagent:/var/lib/waagent \
@@ -70,12 +66,18 @@ start()
 	passwd -u docker
 	checkpath --directory --mode 0700 /home/docker/.ssh
 
-	# Wait for custom data to arrive
-	while [ ! -f /var/lib/waagent/CustomData ]
+	# Wait for WALinux agent provisioning to finish before invoking the
+	# passed custom data.  This assures us that hostname etc. is set
+	# correctly before running, say, swarm commmands.
+	while [ ! -f /var/lib/waagent/provisioned ]
 	do
 		sleep 5
 	done
 
+	# Hack to fix swarm hostname issue.  See
+	# https://github.com/docker/docker/issues/27173
+	service docker restart
+
 	. /var/lib/waagent/CustomData
 
 	eend 0