WIP: Use bootupd to install uefi

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

Basically in order to handle *updates*, bootupd should also
take care of installation.  For example this also generates a JSON
file with the versions.

src/create_disk.sh

@@ -328,30 +328,13 @@ bootloader_backend=none
 
 # Helper to install UEFI on supported architectures
 install_uefi() {
+    # https://github.com/coreos/fedora-coreos-tracker/issues/510
     # 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.
-    local source_efidir="${deploy_root}/usr/lib/ostree-boot/efi"
+    /usr/libexec/bootupd install --src-root=${deploy_root} ${rootfs}
+    # However, we currently install the config file separately.
     local target_efi="$rootfs/boot/efi"
-    local src_grubefi=$(find "${source_efidir}"/EFI/ -maxdepth 1 -type d | grep -v BOOT)
-    local vendor_id="${src_grubefi##*/}"
-    local vendordir="${target_efi}/EFI/${vendor_id}"
-
-    # Some of the files in EFI/BOOT are _symlinks_ to EFI/$VENDOR
-    # in the OS tree. We need to make copies here.
-    mkdir -p "${target_efi}"/EFI/BOOT "${vendordir}"
-    for t in BOOT "${vendor_id}";
-    do
-        (
-            cd "${source_efidir}"/EFI/${t}
-            for i in *; do
-                /usr/lib/coreos-assembler/cp-reflink -vRL \
-                    $(readlink -f $i) \
-                    "${target_efi}"/EFI/"${t}"/
-            done
-        )
-    done
-
+    local grubefi=$(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'

src/vmdeps.txt

@@ -24,6 +24,8 @@ python3 python3-gobject-base buildah podman skopeo iptables iptables-libs
 
 # luks
 cryptsetup
+# How we install/update bootloaders
+bootupd
 # filesystems/storage
 gdisk xfsprogs e2fsprogs dosfstools btrfs-progs