diff --git a/build_library/build_image_util.sh b/build_library/build_image_util.sh
index 2157f00d1a..6f9fe65474 100755
--- a/build_library/build_image_util.sh
+++ b/build_library/build_image_util.sh
@@ -89,10 +89,8 @@ generate_update() {
     extract "${BUILD_DIR}/${image_name}" "USR-A" "${update}.bin"
   delta_generator -private_key "${devkey}" \
     -new_image "${update}.bin" -out_file "${update}.gz"
-  delta_generator -private_key "${devkey}" \
-    -in_file "${update}.gz" -out_metadata "${update}.meta"
 
-  upload_image -d "${update}.DIGESTS" "${update}".{bin,gz,meta,zip}
+  upload_image -d "${update}.DIGESTS" "${update}".{bin,gz,zip}
 }
 
 # Basic command to emerge binary packages into the target image.
diff --git a/image_set_group b/image_set_group
index d523fee87b..777f496d22 100755
--- a/image_set_group
+++ b/image_set_group
@@ -95,11 +95,20 @@ mkdir -p "${ROOT_FS_DIR}"
 
 info "Copying from ${FLAGS_from}"
 cp "${SRC_IMAGE}" "${DST_IMAGE}"
-cp "${FLAGS_from}/version.txt" "${BUILD_DIR}/version.txt"
+
+# Copy all extra useful things, these do not need to be modified.
 UPDATE_PREFIX="${COREOS_PRODUCTION_IMAGE_NAME%_image.bin}_update"
-if [[ -e "${FLAGS_from}/${UPDATE_PREFIX}.bin" ]]; then
-  cp "${FLAGS_from}/${UPDATE_PREFIX}".{bin,gz,meta,zip} "${BUILD_DIR}/"
-fi
+EXTRA_FILES=(
+    "version.txt"
+    "${UPDATE_PREFIX}.bin"
+    "${UPDATE_PREFIX}.zip"
+    "${COREOS_DEVELOPER_CONTAINER_NAME}"
+    )
+for filename in "${EXTRA_FILES[@]}"; do
+    if [[ -e "${FLAGS_from}/${filename}" ]]; then
+        cp "${FLAGS_from}/${filename}" "${BUILD_DIR}/${filename}"
+    fi
+done
 
 "${BUILD_LIBRARY_DIR}/disk_util" --disk_layout="${FLAGS_disk_layout}" \
       mount "${DST_IMAGE}" "${ROOT_FS_DIR}"
@@ -115,11 +124,11 @@ cleanup_mounts "${ROOT_FS_DIR}"
 trap - EXIT
 
 upload_image "${DST_IMAGE}"
-upload_image "${BUILD_DIR}/version.txt"
-if [[ -e "${BUILD_DIR}/${UPDATE_PREFIX}.bin" ]]; then
-  upload_image -d "${BUILD_DIR}/${UPDATE_PREFIX}.DIGESTS" \
-      "${BUILD_DIR}/${UPDATE_PREFIX}".{bin,gz,meta,zip}
-fi
+for filename in "${EXTRA_FILES[@]}"; do
+    if [[ -e "${BUILD_DIR}/${filename}" ]]; then
+        upload_image "${BUILD_DIR}/${filename}"
+    fi
+done
 
 set_build_symlinks "${FLAGS_group}-latest"