ubuntu-cpc: Install grub in ppc64el images so they are bootable (LP: #1538610)

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.209.8) trusty; urgency=medium
+
+  [Daniel Watkins]
+  * Install grub in ppc64el cloud images so they are bootable (LP: #1538610)
+
+ -- Robert C Jennings <robert.jennings@canonical.com>  Tue, 23 May 2017 20:51:47 -0500
+
 livecd-rootfs (2.209.7) trusty; urgency=medium
 
   [Ben Howard]

live-build/ubuntu-cpc/hooks/034-disk-image-ppc64el.binary

@@ -40,6 +40,11 @@ EOF
         --boot-directory=/boot \
         --target=powerpc-ieee1275
 
+    chroot mountpoint dpkg-divert --local --rename /etc/grub.d/30_os-prober
+    chroot mountpoint update-grub
+    sed -i "s,root=.* ,root=LABEL=cloudimg-rootfs ,g" mountpoint/boot/grub/grub.cfg
+    chroot mountpoint dpkg-divert --remove --local --rename /etc/grub.d/30_os-prober
+
     umount_partition mountpoint
     rmdir mountpoint
 }