[r=cjwatson] Enable building of s390x cloud images.

debian/changelog

@@ -8,6 +8,9 @@ livecd-rootfs (2.369) UNRELEASED; urgency=medium
   * live-build/ubuntu-core/hooks/11-remove-extra-packages.chroot:
     - remove libicu52 hook
 
+  [ Daniel Watkins ]
+  * Enable building of s390x cloud images.
+
  -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@canonical.com>  Mon, 14 Dec 2015 10:13:31 +0100
 
 livecd-rootfs (2.368) xenial; urgency=medium

live-build/ubuntu-cpc/hooks/032-disk-image.binary

@@ -34,7 +34,7 @@ rmdir mountpoint
 
 should_install_grub() {
     case $architecture in
-        armhf|arm64)
+        armhf|arm64|s390x)
             return 1
             ;;
         *)
@@ -56,5 +56,30 @@ if should_install_grub; then
     rmdir mountpoint
 fi
 
+if [ "$architecture" = "s390x" ]; then
+    # Do ZIPL install bits
+    mkdir mountpoint
+    mount_partition "${rootfs_dev_mapper}" mountpoint
+
+    # Write out cloudy zipl.conf for future kernel updates
+    cat << EOF > mountpoint/etc/zipl.conf
+# This has been modified by the cloud image build process
+[defaultboot]
+default=ubuntu
+
+[ubuntu]
+target = /boot
+image = /boot/vmlinuz
+ramdisk = /boot/initrd.img
+parameters = root=LABEL=cloudimg-rootfs
+EOF
+
+    # Create bootmap file
+    mountpoint/sbin/zipl -V --image=mountpoint/boot/vmlinuz --ramdisk=mountpoint/boot/initrd.img --parameters='root=LABEL=cloudimg-rootfs' --target=mountpoint/boot/ --targetbase=/dev/loop0 --targettype=SCSI --targetblocksize=512 --targetoffset=2048
+
+    umount_partition mountpoint
+    rmdir mountpoint
+fi
+
 clean_loops
 trap - EXIT

live-build/ubuntu-cpc/hooks/999-cpc-fixes.chroot

@@ -142,6 +142,10 @@ if [[ "$arch" =~ (arm|arm64|aarch64) ]]; then
    exit 0
 fi
 
+if [ "$arch" = "s390x" ]; then
+    exit 0
+fi
+
 ## Add ttyS0 for i386/amd64 for Trusty and newer
 if [ "$arch" = "i386" -o "$arch" = "amd64" ]; then
    add_serial_console ttyS0