minimization handling for UEFI disk images

live-build/ubuntu-cpc/hooks/033-disk-image-uefi.binary

@@ -62,6 +62,14 @@ install_grub() {
     efi_boot_dir="/boot/efi/EFI/BOOT"
     chroot mountpoint mkdir -p "${efi_boot_dir}"
 
+    if [ "$SUBPROJECT" = minimize ] && [ -n "$partuuid" ]; then
+        # FIXME: code duplicated between 032-disk-image.binary
+        # and 033-disk-image-uefi.binary.  We want to fix this to not
+        # have initramfs-tools installed at all on these images.
+        echo "partuuid found for root device; omitting initrd"
+        echo "GRUB_FORCE_PARTUUID=$partuuid" >> mountpoint/etc/default/grub
+    fi
+
     chroot mountpoint apt-get -y update
 
     # UEFI GRUB modules are meant to be used equally by Secure Boot and
@@ -122,6 +130,8 @@ create_empty_disk_image "${disk_image}"
 create_partitions "${disk_image}"
 mount_image "${disk_image}" 1
 
+partuuid=$(blkid -s PARTUUID -o value "$rootfs_dev_mapper")
+
 # Copy the chroot in to the disk
 make_ext4_partition "${rootfs_dev_mapper}"
 mkdir mountpoint