artifacts/cli: introduce CLI command artifact-config-dump-json (alias to artifact, but sets CONFIG_DEFS_ONLY=yes)

- if CONFIG_DEFS_ONLY during `obtain_complete_artifact()`, just dump JSON to stdout after calculating version/coordinates
- don't prepare ORAS tooling if CONFIG_DEFS_ONLY
- don't run in standard build (and thus don't prepare_host()) if under CONFIG_DEFS_ONLY
- if CONFIG_DEFS_ONLY, don't run `check_basic_host()`

lib/functions/artifacts/artifacts-obtain.sh

@@ -141,8 +141,6 @@ function obtain_complete_artifact() {
 	debug_var artifact_final_file_basename
 	debug_var artifact_file_relative
 
-	# @TODO: possibly stop here if only for up-to-date-checking
-
 	# Determine OCI coordinates. OCI_TARGET_BASE overrides the default proposed by the artifact.
 	declare artifact_oci_target_base="undetermined"
 	if [[ -n "${OCI_TARGET_BASE}" ]]; then
@@ -155,6 +153,35 @@ function obtain_complete_artifact() {
 
 	declare -g artifact_full_oci_target="${artifact_oci_target_base}${artifact_name}:${artifact_version}"
 
+	# if CONFIG_DEFS_ONLY, dump JSON and exit
+	if [[ "${CONFIG_DEFS_ONLY}" == "yes" ]]; then
+		display_alert "artifact" "CONFIG_DEFS_ONLY is set, skipping artifact creation" "warn"
+
+		declare -a wanted_vars=(
+			artifact_name
+			artifact_type
+			artifact_version
+			artifact_version_reason
+			artifact_base_dir
+			artifact_final_file
+			artifact_final_file_basename
+			artifact_file_relative
+			artifact_full_oci_target
+		)
+
+		declare -A ARTIFACTS_VAR_DICT=()
+
+		for var in "${wanted_vars[@]}"; do
+			ARTIFACTS_VAR_DICT["${var}"]="$(declare -p "${var}")"
+		done
+
+		display_alert "Dumping JSON" "for ${#ARTIFACTS_VAR_DICT[@]} variables" "ext"
+		python3 "${SRC}/lib/tools/configdump2json.py" "--args" "${ARTIFACTS_VAR_DICT[@]}" # to stdout
+
+		exit 0
+	fi
+
+
 	declare -g artifact_exists_in_local_cache="undetermined"
 	declare -g artifact_exists_in_remote_cache="undetermined"
 

lib/functions/cli/cli-artifact.sh

@@ -17,8 +17,10 @@ function cli_artifact_run() {
 	: "${chosen_artifact:?chosen_artifact is not set}"
 	: "${chosen_artifact_impl:?chosen_artifact_impl is not set}"
 
-	# Make sure ORAS tooling is installed before starting.
-	run_tool_oras
+	if [[ "${CONFIG_DEFS_ONLY}" != "yes" ]]; then
+		# Make sure ORAS tooling is installed before starting.
+		run_tool_oras
+	fi
 
 	display_alert "artifact" "${chosen_artifact}" "debug"
 	display_alert "artifact" "${chosen_artifact} :: ${chosen_artifact_impl}()" "debug"
@@ -62,5 +64,9 @@ function cli_artifact_run() {
 		skip_unpack_if_found_in_caches="no"
 	fi
 
-	do_with_default_build obtain_complete_artifact # @TODO: < /dev/null -- but what about kernel configure?
+	if [[ "${CONFIG_DEFS_ONLY}" != "yes" ]]; then
+		do_with_default_build obtain_complete_artifact # @TODO: < /dev/null -- but what about kernel configure?
+	else
+		obtain_complete_artifact
+	fi
 }

lib/functions/cli/commands.sh

@@ -35,7 +35,8 @@ function armbian_register_commands() {
 		["oras-upload"]="oras" # implemented in cli_oras_pre_run and cli_oras_run; up/down/info are the same, see vars below
 
 		# all-around artifact wrapper
-		["artifact"]="artifact" # implemented in cli_artifact_pre_run and cli_artifact_run
+		["artifact"]="artifact"                  # implemented in cli_artifact_pre_run and cli_artifact_run
+		["artifact-config-dump-json"]="artifact" # implemented in cli_artifact_pre_run and cli_artifact_run
 
 		# shortcuts, see vars set below. the use legacy single build, and try to control it via variables
 		["rootfs"]="artifact"
@@ -72,6 +73,8 @@ function armbian_register_commands() {
 
 		["generate-dockerfile"]="DOCKERFILE_GENERATE_ONLY='yes'"
 
+		["artifact-config-dump-json"]='CONFIG_DEFS_ONLY="yes"'
+
 		# artifact shortcuts
 		["rootfs"]="WHAT='rootfs' ${common_cli_artifact_vars}"
 

lib/functions/main/config-prepare.sh

@@ -53,7 +53,9 @@ function prep_conf_main_minimal_ni() {
 
 	# needed for most stuff, but not for configdump
 	if [[ "${skip_host_config:-"no"}" != "yes" ]]; then
-		check_basic_host
+		if [[ "${CONFIG_DEFS_ONLY}" != "yes" ]]; then
+			check_basic_host
+		fi
 	fi
 
 	# needed for BOARD= builds.