Import patches-unapplied version 2.507 to ubuntu/bionic-proposed

Imported using git-ubuntu import.

Changelog parent: be9e81b561

New changelog entries:
  * ubuntu-server: generate multi-lowerdir overlayfs for
    maas-rack-controller, and full maas. To be used in subiquity for maas
    install options.

debian/changelog

@@ -1,3 +1,11 @@
+livecd-rootfs (2.507) bionic; urgency=medium
+
+  * ubuntu-server: generate multi-lowerdir overlayfs for
+    maas-rack-controller, and full maas. To be used in subiquity for maas
+    install options.
+
+ -- Dimitri John Ledkov <xnox@ubuntu.com>  Wed, 28 Feb 2018 13:11:03 +0000
+
 livecd-rootfs (2.506) bionic; urgency=medium
 
   * live-build-auto/{build,config}: Support fetching a file from the seed

live-build/ubuntu-server/hooks/031-maas-squashfs.binary

@@ -0,0 +1,72 @@
+#!/bin/bash -ex
+# vi: ts=4 noexpandtab
+#
+# Generate a squashfs root and manifest
+
+set -x
+
+echo "031-maas-squashfs.binary"
+
+case $IMAGE_TARGETS in
+	""|*squashfs*)
+		;;
+	*)
+		echo "Skipping squashfs build"
+		exit 0
+		;;
+esac
+
+if [ -n "$SUBARCH" ]; then
+	echo "Skipping rootfs build for subarch flavor build"
+	exit 0
+fi
+
+. config/functions
+. config/common
+
+SQUASH_ROOT=binary/boot/squashfs.dir
+
+RACK_ROOT=binary/boot/squashfs-rack.dir
+REGION_ROOT=binary/boot/squashfs-region.dir
+
+OVERLAY_RACK_ROOT=binary/overlay-maas-rack
+OVERLAY_REGION_ROOT=binary/overlay-maas-region
+
+mkdir -p "$RACK_ROOT"
+mkdir -p "$REGION_ROOT"
+
+mkdir -p "$OVERLAY_RACK_ROOT"
+mkdir -p "$OVERLAY_REGION_ROOT"
+
+# RACK is on top of the regular squashfs
+
+mount_overlay "$SQUASH_ROOT/" "$OVERLAY_RACK_ROOT/" "$RACK_ROOT/" "RACK"
+
+setup_mountpoint $RACK_ROOT
+env DEBIAN_FRONTEND=noninteractive chroot $RACK_ROOT apt-get -y install maas-rack-controller
+teardown_mountpoint $RACK_ROOT
+
+umount "$RACK_ROOT"
+
+# Full MAAS (Region) is on top of the rack
+# in overlayfs lowerdir are mounted right to left, colon separated
+mount_overlay "$OVERLAY_RACK_ROOT/:$SQUASH_ROOT/" "$OVERLAY_REGION_ROOT/" "$REGION_ROOT/" "REGION"
+
+setup_mountpoint $REGION_ROOT
+env DEBIAN_FRONTEND=noninteractive chroot $REGION_ROOT apt-get -y install maas
+chroot $REGION_ROOT pg_ctlcluster 10 main stop
+teardown_mountpoint "$REGION_ROOT"
+
+umount "$REGION_ROOT"
+
+squashfs_rack_f="${PWD}/livecd.${PROJECT}.maas-rack.squashfs"
+
+(cd "$OVERLAY_RACK_ROOT/" &&
+      mksquashfs . ${squashfs_rack_f} \
+        -no-progress -xattrs -comp xz )
+
+squashfs_region_f="${PWD}/livecd.${PROJECT}.maas-region.squashfs"
+
+(cd "$OVERLAY_REGION_ROOT/" &&
+      mksquashfs . ${squashfs_region_f} \
+        -no-progress -xattrs -comp xz )