build_image: Build sysext store after image when requested

This function is meant to prebuild certain sysexts to be released along
with each release. These will not be built into the image, but instead
can be fetched by the user on demand.

The command to build sysexts would be:

  ./build_image prod sysext

Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>

build_image

@@ -108,11 +108,13 @@ fi
 PROD_IMAGE=0
 PROD_TAR=0
 CONTAINER=0
+SYSEXT=0
 for arg in "$@"; do
   case "${arg}" in
     prod) PROD_IMAGE=1 ;;
     prodtar) PROD_IMAGE=1 PROD_TAR=1 ;;
     container) CONTAINER=1 ;;
+    sysext) SYSEXT=1 ;;
     *)    die_notrace "Unknown image type ${arg}" ;;
   esac
 done
@@ -177,6 +179,9 @@ if [[ "${PROD_IMAGE}" -eq 1 ]]; then
     create_prod_tar ${FLATCAR_PRODUCTION_IMAGE_NAME}
   fi
 fi
+if [[ "${SYSEXT}" -eq 1 ]]; then
+  create_prod_sysexts "${FLATCAR_PRODUCTION_IMAGE_NAME}"
+fi
 
 if [[ ${FLAGS_generate_update} -eq ${FLAGS_TRUE} ]] || \
    [[ ${FLAGS_extract_update} -eq ${FLAGS_TRUE} ]]

build_library/prod_image_util.sh

@@ -247,3 +247,42 @@ create_prod_tar() {
   sudo losetup --detach "${lodev}"
   upload_image "${container}"
 }
+
+DEFAULT_SYSEXTS=(
+  flatcar-zfs:sys-fs/zfs
+)
+
+create_prod_sysexts() {
+  local image_name="$1"
+  local image_sysext_base="${image_name%.bin}_sysext.squashfs"
+  sudo rm -rf "${BUILD_DIR}/sysexts/*"
+  mkdir -p "${BUILD_DIR}/sysexts"
+  local to_upload=()
+  for sysext in "${DEFAULT_SYSEXTS[@]}"; do
+    local name="${sysext%:*}"
+    local pkg="${sysext#*:}"
+    local mangle_script="${BUILD_LIBRARY_DIR}/sysext_mangle_${name}"
+    if [[ ! -x "${mangle_script}" ]]; then
+      mangle_script=
+    fi
+    sudo "${SCRIPT_ROOT}/build_sysext" --board="${BOARD}" \
+        --squashfs_base="${BUILD_DIR}/${image_sysext_base}" \
+	--image_builddir="${BUILD_DIR}/sysexts" \
+	${mangle_script:+--manglefs_script=${mangle_script}} \
+	"${name}" "${pkg}"
+    delta_generator \
+      -private_key "/usr/share/update_engine/update-payload-key.key.pem" \
+      -new_image "${BUILD_DIR}/sysexts/${name}.raw" \
+      -out_file "${BUILD_DIR}/sysexts/flatcar_test_update-${name}.gz"
+    to_upload+=(
+        "${BUILD_DIR}/sysexts/${name}.raw"
+        "${BUILD_DIR}/sysexts/${name}_contents.txt"
+        "${BUILD_DIR}/sysexts/${name}_contents_wtd.txt"
+        "${BUILD_DIR}/sysexts/${name}_disk_usage.txt"
+        "${BUILD_DIR}/sysexts/${name}_packages.txt"
+        "${BUILD_DIR}/sysexts/flatcar_test_update-${name}.gz"
+    )
+  done
+  upload_image -d ${BUILD_DIR}/sysexts/sysext.DIGESTS "${to_upload[@]}"
+}
+