ci-automation: List built base sysext explicitly

Instead of depending on default value of build_image's base_sysext
parameter, create a file that explicitly lists which base sysexts will
be built for each architecture. The file can be sourced by other
scripts that need this kind of information. Currently, image.sh and
image_changes.sh use this file.

.github/workflows/ci.yaml

@@ -283,7 +283,7 @@ jobs:
 
           declare -a oemids base_sysexts
           get_oem_id_list . "${arch}" oemids
-          get_base_sysext_list . base_sysexts
+          get_base_sysext_list . "${arch}" base_sysexts
           generate_image_changes_report \
               "${version_description}" 'image-changes-reports-release.txt' "../flatcar-build-scripts" \
               "${package_diff_env[@]}" --- "${package_diff_params[@]}" -- \

ci-automation/base_sysexts.sh

@@ -0,0 +1,16 @@
+# Definitions of base sysexts to be built, for each arch. Used by
+# image.sh and image_changes.sh.
+
+if [[ ${1:-} = 'local' ]]; then
+    local amd64_base_sysexts arm64_base_sysexts
+fi
+
+amd64_base_sysexts=(
+    'containerd-flatcar:app-containers/containerd'
+    'docker-flatcar:app-containers/docker'
+)
+
+arm64_base_sysexts=(
+    'containerd-flatcar:app-containers/containerd'
+    'docker-flatcar:app-containers/docker'
+)

ci-automation/image.sh

@@ -86,6 +86,10 @@ function _image_build_impl() {
 
     apply_local_patches
 
+    source ci-automation/base_sysexts.sh 'local'
+    local -n base_sysexts_ref="${arch}_base_sysexts"
+    local base_sysexts_param=$(export IFS=,; echo "${base_sysexts_ref[*]}")
+
     # build image and related artifacts
     ./run_sdk_container -x ./ci-cleanup.sh -n "${image_container}" -C "${packages_image}" \
             -v "${vernum}" \
@@ -96,6 +100,7 @@ function _image_build_impl() {
     ./run_sdk_container -n "${image_container}" -C "${packages_image}" \
             -v "${vernum}" \
             ./build_image --board="${arch}-usr" --group="${channel}" \
+                          --base_sysexts="${base_sysexts_param}" \
                           --output_root="${CONTAINER_IMAGE_ROOT}" \
                           --only_store_compressed \
                           prodtar container

ci-automation/image_changes.sh

@@ -109,7 +109,7 @@ function image_changes() (
     echo
     local -a oemids base_sysexts
     get_oem_id_list . "${arch}" oemids
-    get_base_sysext_list . base_sysexts
+    get_base_sysext_list . "${arch}" base_sysexts
     generate_image_changes_report \
         "${version_description}" '-' "${fbs_repo}" \
         "${package_diff_env[@]}" --- "${package_diff_params[@]}" -- \
@@ -262,18 +262,15 @@ function get_oem_id_list() {
 
 function get_base_sysext_list() {
     local scripts_repo=${1}; shift
+    local arch=${1}; shift
     local -n list_var_ref=${1}; shift
 
-    local line
-    line=$({ git -C "${scripts_repo}" grep -F 'DEFINE_string base_sysexts ' | head -n1; } || :)
-    line=${line#*'"'}
-    line=${line%'"'*}
+    source "${scripts_repo}/ci-automation/base_sysexts.sh" 'local'
+    local -n base_sysexts_ref="${arch}_base_sysexts"
 
     list_var_ref=()
-    local -a entries
-    mapfile -t entries <<<"${line//,/$'\n'}"
     local entry
-    for entry in "${entries[@]}"; do
+    for entry in "${base_sysexts_ref[@]}"; do
         list_var_ref+=( "${entry%%:*}" )
     done
 }