create_disk: Use bootupd to install UEFI if available

See https://github.com/coreos/bootupd
and coreos/fedora-coreos-tracker#510

Basically in order to handle *updates*, bootupd also
takes care of installation so that it knows the original
version.

In order to sanely "ratchet" this change, only use bootupd if
we find the ostree deployment is using it.

src/create_disk.sh

@@ -314,8 +314,7 @@ EOF
 # be overridden below
 bootloader_backend=none
 
-# Helper to install UEFI on supported architectures
-install_uefi() {
+install_uefi_without_bootupd() {
     # See also https://github.com/ostreedev/ostree/pull/1873#issuecomment-524439883
     # In the future it'd be better to get this stuff out of the OSTree commit and
     # change our build process to download+extract it separately.
@@ -339,7 +338,21 @@ install_uefi() {
             done
         )
     done
+}
 
+install_uefi() {
+    if test -d "${deploy_root}"/usr/lib/bootupd/updates; then
+        # https://github.com/coreos/fedora-coreos-tracker/issues/510
+        # See also https://github.com/ostreedev/ostree/pull/1873#issuecomment-524439883
+        /usr/bin/bootupctl backend install --src-root="${deploy_root}" "${rootfs}"
+    else
+        install_uefi_without_bootupd
+    fi
+    # We have a "static" grub config file that basically configures grub to look
+    # in the partition labeled "boot".
+    local target_efi="$rootfs/boot/efi"
+    local grubefi=$(find "${target_efi}/EFI/" -maxdepth 1 -type d | grep -v BOOT)
+    local vendor_id="${grubefi##*/}"
     local vendordir="${target_efi}/EFI/${vendor_id}"
     mkdir -p "${vendordir}"
 	cat > ${vendordir}/grub.cfg << 'EOF'
@@ -348,8 +361,10 @@ set prefix=($prefix)
 configfile $prefix/grub2/grub.cfg
 boot
 EOF
+}
 
-    # copy the grub config and any other files we might need
+# copy the grub config and any other files we might need
+install_grub_cfg() {
     mkdir -p $rootfs/boot/grub2
     cp -v $grub_script $rootfs/boot/grub2/grub.cfg
 }
@@ -367,6 +382,7 @@ x86_64)
         --boot-directory $rootfs/boot \
         $disk
     fi
+    install_grub_cfg
     ;;
 aarch64)
     # Our aarch64 is UEFI only.
@@ -375,9 +391,7 @@ aarch64)
 ppc64le)
     # to populate PReP Boot, i.e. support pseries
     grub2-install --target=powerpc-ieee1275 --boot-directory $rootfs/boot --no-nvram "${disk}${PREPPN}"
-    mkdir -p $rootfs/boot/grub2
-    # copy the grub config and any other files we might need
-    cp $grub_script $rootfs/boot/grub2/grub.cfg
+    install_grub_cfg
     ;;
 s390x)
     bootloader_backend=zipl

src/vmdeps-aarch64.txt

@@ -1,5 +1,6 @@
 # For grub install when creating images and pxe install
 grub2 grub2-tools-extra
+bootupd
 
 # For creating bootable UEFI media on aarch64
 shim-aa64 grub2-efi-aa64

src/vmdeps-x86_64.txt

@@ -1,5 +1,6 @@
 # For grub install when creating images without anaconda
 grub2
+bootupd
 
 # For creating bootable UEFI media on x86_64
 shim-x64 grub2-efi-x64