ci-automation/image-changes: Filter out OEM IDs not built for an arch

This is to limit the amount of reports consisting purely of failures,
because some files were missing. And those files will be missing,
because an OEM might not even have any image for certain arches (like
digitalocean has no arm64 images).

.github/workflows/ci.yaml

@@ -295,7 +295,7 @@ jobs:
           )
 
           declare -a oemids
-          get_oem_id_list . oemids
+          get_oem_id_list . "${arch}" oemids
           generate_image_changes_report \
               "${version_description}" 'image-changes-reports-release.txt' "../flatcar-build-scripts" \
               "${package_diff_env[@]}" --- "${package_diff_params[@]}" -- \
@@ -352,7 +352,7 @@ jobs:
           )
 
           declare -a oemids
-          get_oem_id_list . oemids
+          get_oem_id_list . "${arch}" oemids
           generate_image_changes_report \
               "${version_description}" 'image-changes-reports-nightly.txt' "../flatcar-build-scripts" \
               "${package_diff_env[@]}" --- "${package_diff_params[@]}" -- \

ci-automation/image_changes.sh

@@ -201,10 +201,12 @@ function git_tag_for_nightly() {
 # Gets a list of OEMs that are using sysexts.
 #
 # 1 - scripts repo
-# 2 - name of an array variable to store the result in
+# 2 - arch
+# 3 - name of an array variable to store the result in
 function get_oem_id_list() {
-    local scripts_repo
+    local scripts_repo arch
     scripts_repo=${1}; shift
+    arch=${1}; shift
     local -n list_var_ref=${1}; shift
 
     local -a ebuilds
@@ -214,22 +216,44 @@ function get_oem_id_list() {
     if [[ ${#ebuilds[@]} -eq 0 ]]; then
         return 0
     fi
-    local line mode
-    # 0 = none OEMIDS line found yet
+    local mode
+    # 0 = no OEMIDS line found yet
     # 1 = OEMIDS line found
     mode=0
-    while read -r line; do
+    local -a fields
+    local first arch_field arch_found
+    while read -r -a fields; do
+        if [[ ${#fields[@]} -eq 0 ]]; then
+            continue
+        fi
+        first=${fields[0]}
         case ${mode} in
             0)
-                if [[ ${line} = 'OEMIDS=(' ]]; then
+                if [[ ${first} = 'OEMIDS=(' ]]; then
                     mode=1
                 fi
                 ;;
             1)
-                if [[ ${line} = ')' ]]; then
+                if [[ ${first} = ')' ]]; then
                     break
                 fi
-                list_var_ref+=( "${line}" )
+                if [[ ${#fields[@]} -gt 1 ]]; then
+                    if [[ ${fields[1]} != '#' ]]; then
+                        echo "expect a line inside OEMIDS to be like '<OEMID> # <ARCH1> <ARCH2>…' or just '<OEMID>', got '${fields[*]}'" >&2
+                        exit 1
+                    fi
+                    arch_found=
+                    for arch_field in "${fields[@]:2}"; do
+                        if [[ ${arch} = "${arch_field}" ]]; then
+                            arch_found=x
+                            break
+                        fi
+                    done
+                    if [[ -z ${arch_found} ]]; then
+                        continue
+                    fi
+                fi
+                list_var_ref+=( "${first}" )
                 ;;
         esac
     done <"${ebuilds[0]}"