448 lines
26 KiB
Bash
448 lines
26 KiB
Bash
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# global variables managing the state of the extension manager. treat as private.
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declare -A extension_function_info # maps a function name to a string with KEY=VALUEs information about the defining extension
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declare -i initialize_extension_manager_counter=0 # how many times has the extension manager initialized?
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declare -A defined_hook_point_functions # keeps a map of hook point functions that were defined and their extension info
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declare -A hook_point_function_trace_sources # keeps a map of hook point functions that were actually called and their source
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declare -A hook_point_function_trace_lines # keeps a map of hook point functions that were actually called and their source
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declare fragment_manager_cleanup_file # this is a file used to cleanup the manager's produced functions, for build_all_ng
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# configuration.
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export DEBUG_EXTENSION_CALLS=no # set to yes to log every hook function called to the main build log
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export LOG_ENABLE_EXTENSION=yes # colorful logs with stacktrace when enable_extension is called.
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# This is a helper function for calling hooks.
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# It follows the pattern long used in the codebase for hook-like behaviour:
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# [[ $(type -t name_of_hook_function) == function ]] && name_of_hook_function
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# but with the following added behaviors:
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# 1) it allows for many arguments, and will treat each as a hook point.
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# this allows for easily kept backwards compatibility when renaming hooks, for example.
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# 2) it will read the stdin and assume it's (Markdown) documentation for the hook point.
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# combined with heredoc in the call site, it allows for "inline" documentation about the hook
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# notice: this is not involved in how the hook functions came to be. read below for that.
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call_extension_method() {
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# First, consume the stdin and write metadata about the call.
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write_hook_point_metadata "$@" || true
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# @TODO: hack to handle stdin again, possibly with '< /dev/tty'
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# Then a sanity check, hook points should only be invoked after the manager has initialized.
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if [[ ${initialize_extension_manager_counter} -lt 1 ]]; then
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display_alert "Extension problem" "Call to call_extension_method() (in ${BASH_SOURCE[1]- $(get_extension_hook_stracktrace "${BASH_SOURCE[*]}" "${BASH_LINENO[*]}")}) before extension manager is initialized." "err"
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fi
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# With DEBUG_EXTENSION_CALLS, log the hook call. Users might be wondering what/when is a good hook point to use, and this is visual aid.
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[[ "${DEBUG_EXTENSION_CALLS}" == "yes" ]] &&
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display_alert "--> Extension Method '${1}' being called from" "$(get_extension_hook_stracktrace "${BASH_SOURCE[*]}" "${BASH_LINENO[*]}")" ""
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# Then call the hooks, if they are defined.
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for hook_name in "$@"; do
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echo "-- Extension Method being called: ${hook_name}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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# shellcheck disable=SC2086
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[[ $(type -t ${hook_name}) == function ]] && { ${hook_name}; }
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done
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}
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# what this does is a lot of bash mumbo-jumbo to find all board-,family-,config- or user-defined hook points.
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# the meat of this is 'compgen -A function', which is bash builtin that lists all defined functions.
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# it will then compose a full hook point (function) that calls all the implementing hooks.
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# this centralized function will then be called by the regular Armbian build system, which is oblivious to how
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# it came to be. (although it is encouraged to call hook points via call_extension_method() above)
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# to avoid hard coding the list of hook-points (eg: user_config, image_tweaks_pre_customize, etc) we use
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# a marker in the function names, namely "__" (two underscores) to determine the hook point.
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initialize_extension_manager() {
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# before starting, auto-add extensions specified (eg, on the command-line) via the ENABLE_EXTENSIONS env var. Do it only once.
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[[ ${initialize_extension_manager_counter} -lt 1 ]] && [[ "${ENABLE_EXTENSIONS}" != "" ]] && {
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local auto_extension
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for auto_extension in $(echo "${ENABLE_EXTENSIONS}" | tr "," " "); do
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ENABLE_EXTENSION_TRACE_HINT="ENABLE_EXTENSIONS -> " enable_extension "${auto_extension}"
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done
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}
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# This marks the manager as initialized, no more extensions are allowed to load after this.
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export initialize_extension_manager_counter=$((initialize_extension_manager_counter + 1))
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# Have a unique temporary dir, even if being built concurrently by build_all_ng.
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export EXTENSION_MANAGER_TMP_DIR="${SRC}/.tmp/.extensions/${LOG_SUBPATH}"
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mkdir -p "${EXTENSION_MANAGER_TMP_DIR}"
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# Log destination.
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export EXTENSION_MANAGER_LOG_FILE="${EXTENSION_MANAGER_TMP_DIR}/extensions.log"
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echo -n "" >"${EXTENSION_MANAGER_TMP_DIR}/hook_point_calls.txt"
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# globally initialize the extensions log.
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echo "-- lib/extensions.sh included. logs will be below, followed by the debug generated by the initialize_extension_manager() function." >"${EXTENSION_MANAGER_LOG_FILE}"
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# log whats happening.
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echo "-- initialize_extension_manager() called." >>"${EXTENSION_MANAGER_LOG_FILE}"
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# this is the all-important separator.
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local hook_extension_delimiter="__"
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# list all defined functions. filter only the ones that have the delimiter. get only the part before the delimiter.
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# sort them, and make them unique. the sorting is required for uniq to work, and does not affect the ordering of execution.
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# get them on a single line, space separated.
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local all_hook_points
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all_hook_points="$(compgen -A function | grep "${hook_extension_delimiter}" | awk -F "${hook_extension_delimiter}" '{print $1}' | sort | uniq | xargs echo -n)"
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declare -i hook_points_counter=0 hook_functions_counter=0 hook_point_functions_counter=0
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# initialize the cleanups file.
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fragment_manager_cleanup_file="${SRC}"/.tmp/extension_function_cleanup.sh
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echo "# cleanups: " >"${fragment_manager_cleanup_file}"
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local FUNCTION_SORT_OPTIONS="--general-numeric-sort --ignore-case" # --random-sort could be used to introduce chaos
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local hook_point=""
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# now loop over the hook_points.
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for hook_point in ${all_hook_points}; do
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echo "-- hook_point ${hook_point}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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# check if the hook point is already defined as a function.
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# that can happen for example with user_config(), that can be implemented itself directly by a userpatches config.
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# for now, just warn, but we could devise a way to actually integrate it in the call list.
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# or: advise the user to rename their user_config() function to something like user_config__make_it_awesome()
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local existing_hook_point_function
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existing_hook_point_function="$(compgen -A function | grep "^${hook_point}\$")"
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if [[ "${existing_hook_point_function}" == "${hook_point}" ]]; then
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echo "--- hook_point_functions (final sorted realnames): ${hook_point_functions}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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display_alert "Extension conflict" "function ${hook_point} already defined! ignoring functions: $(compgen -A function | grep "^${hook_point}${hook_extension_delimiter}")" "wrn"
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continue
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fi
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# for each hook_point, obtain the list of implementing functions.
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# the sort order here is (very) relevant, since it determines final execution order.
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# so the name of the functions actually determine the ordering.
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local hook_point_functions hook_point_functions_pre_sort hook_point_functions_sorted_by_sort_id
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# Sorting. Multiple extensions (or even the same extension twice) can implement the same hook point
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# as long as they have different function names (the part after the double underscore __).
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# the order those will be called depends on the name; eg:
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# 'hook_point__033_be_awesome()' would be caller sooner than 'hook_point__799_be_even_more_awesome()'
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# independent from where they were defined or in which order the extensions containing them were added.
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# since requiring specific ordering could hamper portability, we reward extension authors who
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# don't mind ordering for writing just: 'hook_point__be_just_awesome()' which is automatically rewritten
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# as 'hook_point__500_be_just_awesome()'.
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# extension authors who care about ordering can use the 3-digit number, and use the context variables
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# HOOK_ORDER and HOOK_POINT_TOTAL_FUNCS to confirm in which order they're being run.
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# gather the real names of the functions (after the delimiter).
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hook_point_functions_pre_sort="$(compgen -A function | grep "^${hook_point}${hook_extension_delimiter}" | awk -F "${hook_extension_delimiter}" '{print $2}' | xargs echo -n)"
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echo "--- hook_point_functions_pre_sort: ${hook_point_functions_pre_sort}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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# add "500_" to the names of function that do NOT start with a number.
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# keep a reference from the new names to the old names (we'll sort on the new, but invoke the old)
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declare -A hook_point_functions_sortname_to_realname
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declare -A hook_point_functions_realname_to_sortname
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for hook_point_function_realname in ${hook_point_functions_pre_sort}; do
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local sort_id="${hook_point_function_realname}"
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[[ ! $sort_id =~ ^[0-9] ]] && sort_id="500_${sort_id}"
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hook_point_functions_sortname_to_realname[${sort_id}]="${hook_point_function_realname}"
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hook_point_functions_realname_to_sortname[${hook_point_function_realname}]="${sort_id}"
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done
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# actually sort the sort_id's...
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# shellcheck disable=SC2086
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hook_point_functions_sorted_by_sort_id="$(echo "${hook_point_functions_realname_to_sortname[*]}" | tr " " "\n" | LC_ALL=C sort ${FUNCTION_SORT_OPTIONS} | xargs echo -n)"
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echo "--- hook_point_functions_sorted_by_sort_id: ${hook_point_functions_sorted_by_sort_id}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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# then map back to the real names, keeping the order..
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hook_point_functions=""
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for hook_point_function_sortname in ${hook_point_functions_sorted_by_sort_id}; do
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hook_point_functions="${hook_point_functions} ${hook_point_functions_sortname_to_realname[${hook_point_function_sortname}]}"
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done
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# shellcheck disable=SC2086
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hook_point_functions="$(echo -n ${hook_point_functions})"
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echo "--- hook_point_functions (final sorted realnames): ${hook_point_functions}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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hook_point_functions_counter=0
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hook_points_counter=$((hook_points_counter + 1))
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# determine the variables we'll pass to the hook function during execution.
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# this helps the extension author create extensions that are portable between userpatches and official Armbian.
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# shellcheck disable=SC2089
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local common_function_vars="HOOK_POINT=\"${hook_point}\""
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# loop over the functions for this hook_point (keep a total for the hook point and a grand running total)
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for hook_point_function in ${hook_point_functions}; do
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hook_point_functions_counter=$((hook_point_functions_counter + 1))
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hook_functions_counter=$((hook_functions_counter + 1))
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done
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common_function_vars="${common_function_vars} HOOK_POINT_TOTAL_FUNCS=\"${hook_point_functions_counter}\""
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echo "-- hook_point: ${hook_point} will run ${hook_point_functions_counter} functions: ${hook_point_functions}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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local temp_source_file_for_hook_point="${EXTENSION_MANAGER_TMP_DIR}/extension_function_definition.sh"
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hook_point_functions_loop_counter=0
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# prepare the cleanup for the function, so we can remove our mess at the end of the build.
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cat <<-FUNCTION_CLEANUP_FOR_HOOK_POINT >>"${fragment_manager_cleanup_file}"
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unset ${hook_point}
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FUNCTION_CLEANUP_FOR_HOOK_POINT
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# now compose a function definition. notice the heredoc. it will be written to tmp file, logged, then sourced.
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# theres a lot of opportunities here, but for now I keep it simple:
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# - execute functions in the order defined by ${hook_point_functions} above
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# - define call-specific environment variables, to help extension authors to write portable extensions (eg: EXTENSION_DIR)
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cat <<-FUNCTION_DEFINITION_HEADER >"${temp_source_file_for_hook_point}"
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${hook_point}() {
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echo "*** Extension-managed hook starting '${hook_point}': will run ${hook_point_functions_counter} functions: '${hook_point_functions}'" >>"\${EXTENSION_MANAGER_LOG_FILE}"
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FUNCTION_DEFINITION_HEADER
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for hook_point_function in ${hook_point_functions}; do
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hook_point_functions_loop_counter=$((hook_point_functions_loop_counter + 1))
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# store the full name in a hash, so we can track which were actually called later.
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defined_hook_point_functions["${hook_point}${hook_extension_delimiter}${hook_point_function}"]="DEFINED=yes ${extension_function_info["${hook_point}${hook_extension_delimiter}${hook_point_function}"]}"
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# prepare the call context
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local hook_point_function_variables="${common_function_vars}" # start with common vars... (eg: HOOK_POINT_TOTAL_FUNCS)
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# add the contextual extension info for the function (eg, EXTENSION_DIR)
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hook_point_function_variables="${hook_point_function_variables} ${extension_function_info["${hook_point}${hook_extension_delimiter}${hook_point_function}"]}"
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# add the current execution counter, so the extension author can know in which order it is being actually called
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hook_point_function_variables="${hook_point_function_variables} HOOK_ORDER=\"${hook_point_functions_loop_counter}\""
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# add it to our (not the call site!) environment. if we export those in the call site, the stack is corrupted.
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eval "${hook_point_function_variables}"
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# output the call, passing arguments, and also logging the output to the extensions log.
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# attention: don't pipe here (eg, capture output), otherwise hook function cant modify the environment (which is mostly the point)
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# @TODO: better error handling. we have a good opportunity to 'set -e' here, and 'set +e' after, so that extension authors are encouraged to write error-free handling code
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cat <<-FUNCTION_DEFINITION_CALLSITE >>"${temp_source_file_for_hook_point}"
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hook_point_function_trace_sources["${hook_point}${hook_extension_delimiter}${hook_point_function}"]="\${BASH_SOURCE[*]}"
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hook_point_function_trace_lines["${hook_point}${hook_extension_delimiter}${hook_point_function}"]="\${BASH_LINENO[*]}"
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[[ "\${DEBUG_EXTENSION_CALLS}" == "yes" ]] && display_alert "---> Extension Method ${hook_point}" "${hook_point_functions_loop_counter}/${hook_point_functions_counter} (ext:${EXTENSION:-built-in}) ${hook_point_function}" ""
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echo "*** *** Extension-managed hook starting ${hook_point_functions_loop_counter}/${hook_point_functions_counter} '${hook_point}${hook_extension_delimiter}${hook_point_function}':" >>"\${EXTENSION_MANAGER_LOG_FILE}"
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${hook_point_function_variables} ${hook_point}${hook_extension_delimiter}${hook_point_function} "\$@"
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echo "*** *** Extension-managed hook finished ${hook_point_functions_loop_counter}/${hook_point_functions_counter} '${hook_point}${hook_extension_delimiter}${hook_point_function}':" >>"\${EXTENSION_MANAGER_LOG_FILE}"
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FUNCTION_DEFINITION_CALLSITE
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# output the cleanup for the implementation as well.
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cat <<-FUNCTION_CLEANUP_FOR_HOOK_POINT_IMPLEMENTATION >>"${fragment_manager_cleanup_file}"
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unset ${hook_point}${hook_extension_delimiter}${hook_point_function}
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FUNCTION_CLEANUP_FOR_HOOK_POINT_IMPLEMENTATION
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# unset extension vars for the next loop.
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unset EXTENSION EXTENSION_DIR EXTENSION_FILE EXTENSION_ADDED_BY
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done
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cat <<-FUNCTION_DEFINITION_FOOTER >>"${temp_source_file_for_hook_point}"
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echo "*** Extension-managed hook ending '${hook_point}': completed." >>"\${EXTENSION_MANAGER_LOG_FILE}"
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} # end ${hook_point}() function
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FUNCTION_DEFINITION_FOOTER
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# unsets, lest the next loop inherits them
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unset hook_point_functions hook_point_functions_sortname_to_realname hook_point_functions_realname_to_sortname
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# log what was produced in our own debug logfile
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cat "${temp_source_file_for_hook_point}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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cat "${fragment_manager_cleanup_file}" >>"${EXTENSION_MANAGER_LOG_FILE}"
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# source the generated function.
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# shellcheck disable=SC1090
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source "${temp_source_file_for_hook_point}"
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rm -f "${temp_source_file_for_hook_point}"
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done
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# Dont show any output until we have more than 1 hook function (we implement one already, below)
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[[ ${hook_functions_counter} -gt 0 ]] &&
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display_alert "Extension manager" "processed ${hook_points_counter} Extension Methods calls and ${hook_functions_counter} Extension Method implementations" "info" | tee -a "${EXTENSION_MANAGER_LOG_FILE}"
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}
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cleanup_extension_manager() {
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if [[ -f "${fragment_manager_cleanup_file}" ]]; then
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display_alert "Cleaning up" "extension manager" "info"
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# this will unset all the functions.
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# shellcheck disable=SC1090 # dynamic source, thanks, shellcheck
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source "${fragment_manager_cleanup_file}"
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fi
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# reset/unset the variables used
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initialize_extension_manager_counter=0
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unset extension_function_info defined_hook_point_functions hook_point_function_trace_sources hook_point_function_trace_lines fragment_manager_cleanup_file
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}
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# why not eat our own dog food?
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# process everything that happened during extension related activities
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# and write it to the log. also, move the log from the .tmp dir to its
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# final location. this will make run_after_build() "hot" (eg, emit warnings)
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|
|
run_after_build__999_finish_extension_manager() {
|
||
|
|
# export these maps, so the hook can access them and produce useful stuff.
|
||
|
|
export defined_hook_point_functions hook_point_function_trace_sources
|
||
|
|
|
||
|
|
# eat our own dog food, pt2.
|
||
|
|
call_extension_method "extension_metadata_ready" <<'EXTENSION_METADATA_READY'
|
||
|
|
*meta-Meta time!*
|
||
|
|
Implement this hook to work with/on the meta-data made available by the extension manager.
|
||
|
|
Interesting stuff to process:
|
||
|
|
- `"${EXTENSION_MANAGER_TMP_DIR}/hook_point_calls.txt"` contains a list of all hook points called, in order.
|
||
|
|
- For each hook_point in the list, more files will have metadata about that hook point.
|
||
|
|
- `${EXTENSION_MANAGER_TMP_DIR}/hook_point.orig.md` contains the hook documentation at the call site (inline docs), hopefully in Markdown format.
|
||
|
|
- `${EXTENSION_MANAGER_TMP_DIR}/hook_point.compat` contains the compatibility names for the hooks.
|
||
|
|
- `${EXTENSION_MANAGER_TMP_DIR}/hook_point.exports` contains _exported_ environment variables.
|
||
|
|
- `${EXTENSION_MANAGER_TMP_DIR}/hook_point.vars` contains _all_ environment variables.
|
||
|
|
- `${defined_hook_point_functions}` is a map of _all_ the defined hook point functions and their extension information.
|
||
|
|
- `${hook_point_function_trace_sources}` is a map of all the hook point functions _that were really called during the build_ and their BASH_SOURCE information.
|
||
|
|
- `${hook_point_function_trace_lines}` is the same, but BASH_LINENO info.
|
||
|
|
After this hook is done, the `${EXTENSION_MANAGER_TMP_DIR}` will be removed.
|
||
|
|
EXTENSION_METADATA_READY
|
||
|
|
|
||
|
|
# Move temporary log file over to final destination, and start writing to it instead (although 999 is pretty late in the game)
|
||
|
|
mv "${EXTENSION_MANAGER_LOG_FILE}" "${DEST}/${LOG_SUBPATH:-debug}/extensions.log"
|
||
|
|
export EXTENSION_MANAGER_LOG_FILE="${DEST}/${LOG_SUBPATH:-debug}/extensions.log"
|
||
|
|
|
||
|
|
# Cleanup. Leave no trace...
|
||
|
|
[[ -d "${EXTENSION_MANAGER_TMP_DIR}" ]] && rm -rf "${EXTENSION_MANAGER_TMP_DIR}"
|
||
|
|
}
|
||
|
|
|
||
|
|
# This is called by call_extension_method(). To say the truth, this should be in an extension. But then it gets too meta for anyone's head.
|
||
|
|
write_hook_point_metadata() {
|
||
|
|
local main_hook_point_name="$1"
|
||
|
|
|
||
|
|
[[ ! -d "${EXTENSION_MANAGER_TMP_DIR}" ]] && mkdir -p "${EXTENSION_MANAGER_TMP_DIR}"
|
||
|
|
cat - >"${EXTENSION_MANAGER_TMP_DIR}/${main_hook_point_name}.orig.md" # Write the hook point documentation received via stdin to a tmp file for later processing.
|
||
|
|
shift
|
||
|
|
echo -n "$@" >"${EXTENSION_MANAGER_TMP_DIR}/${main_hook_point_name}.compat" # log the 2nd+ arguments too (those are the alternative/compatibility names), separate file.
|
||
|
|
compgen -A export >"${EXTENSION_MANAGER_TMP_DIR}/${main_hook_point_name}.exports" # capture the exported env vars.
|
||
|
|
compgen -A variable >"${EXTENSION_MANAGER_TMP_DIR}/${main_hook_point_name}.vars" # capture all env vars.
|
||
|
|
|
||
|
|
# add to the list of hook points called, in order.
|
||
|
|
echo "${main_hook_point_name}" >>"${EXTENSION_MANAGER_TMP_DIR}/hook_point_calls.txt"
|
||
|
|
}
|
||
|
|
|
||
|
|
# Helper function, to get clean "stack traces" that do not include the hook/extension infrastructure code.
|
||
|
|
get_extension_hook_stracktrace() {
|
||
|
|
local sources_str="$1" # Give this ${BASH_SOURCE[*]} - expanded
|
||
|
|
local lines_str="$2" # And this # Give this ${BASH_LINENO[*]} - expanded
|
||
|
|
local sources lines index final_stack=""
|
||
|
|
IFS=' ' read -r -a sources <<<"${sources_str}"
|
||
|
|
IFS=' ' read -r -a lines <<<"${lines_str}"
|
||
|
|
for index in "${!sources[@]}"; do
|
||
|
|
local source="${sources[index]}" line="${lines[((index - 1))]}"
|
||
|
|
# skip extension infrastructure sources, these only pollute the trace and add no insight to users
|
||
|
|
[[ ${source} == */.tmp/extension_function_definition.sh ]] && continue
|
||
|
|
[[ ${source} == *lib/extensions.sh ]] && continue
|
||
|
|
[[ ${source} == */compile.sh ]] && continue
|
||
|
|
# relativize the source, otherwise too long to display
|
||
|
|
source="${source#"${SRC}/"}"
|
||
|
|
# remove 'lib/'. hope this is not too confusing.
|
||
|
|
source="${source#"lib/"}"
|
||
|
|
# add to the list
|
||
|
|
arrow="$([[ "$final_stack" != "" ]] && echo "-> ")"
|
||
|
|
final_stack="${source}:${line} ${arrow} ${final_stack} "
|
||
|
|
done
|
||
|
|
# output the result, no newline
|
||
|
|
# shellcheck disable=SC2086 # I wanna suppress double spacing, thanks
|
||
|
|
echo -n $final_stack
|
||
|
|
}
|
||
|
|
|
||
|
|
show_caller_full() {
|
||
|
|
local frame=0
|
||
|
|
while caller $frame; do
|
||
|
|
((frame++))
|
||
|
|
done
|
||
|
|
}
|
||
|
|
# can be called by board, family, config or user to make sure an extension is included.
|
||
|
|
# single argument is the extension name.
|
||
|
|
# will look for it in /userpatches/extensions first.
|
||
|
|
# if not found there will look in /extensions
|
||
|
|
# if not found will exit 17
|
||
|
|
declare -i enable_extension_recurse_counter=0
|
||
|
|
declare -a enable_extension_recurse_stack
|
||
|
|
enable_extension() {
|
||
|
|
local extension_name="$1"
|
||
|
|
local extension_dir extension_file extension_file_in_dir extension_floating_file
|
||
|
|
local stacktrace
|
||
|
|
|
||
|
|
# capture the stack leading to this, possibly with a hint in front.
|
||
|
|
stacktrace="${ENABLE_EXTENSION_TRACE_HINT}$(get_extension_hook_stracktrace "${BASH_SOURCE[*]}" "${BASH_LINENO[*]}")"
|
||
|
|
|
||
|
|
# if LOG_ENABLE_EXTENSION, output useful stack, so user can figure out which extensions are being added where
|
||
|
|
[[ "${LOG_ENABLE_EXTENSION}" == "yes" ]] &&
|
||
|
|
display_alert "Extension being added" "${extension_name} :: added by ${stacktrace}" ""
|
||
|
|
|
||
|
|
# first a check, has the extension manager already initialized? then it is too late to enable_extension(). bail.
|
||
|
|
if [[ ${initialize_extension_manager_counter} -gt 0 ]]; then
|
||
|
|
display_alert "Extension problem" "already initialized -- too late to add '${extension_name}' (trace: ${stacktrace})" "err"
|
||
|
|
exit 2
|
||
|
|
fi
|
||
|
|
|
||
|
|
# check the counter. if recurring, add to the stack and return success
|
||
|
|
if [[ $enable_extension_recurse_counter -gt 1 ]]; then
|
||
|
|
enable_extension_recurse_stack+=("${extension_name}")
|
||
|
|
return 0
|
||
|
|
fi
|
||
|
|
|
||
|
|
# increment the counter
|
||
|
|
enable_extension_recurse_counter=$((enable_extension_recurse_counter + 1))
|
||
|
|
|
||
|
|
# there are many opportunities here. too many, actually. let userpatches override just some functions, etc.
|
||
|
|
for extension_base_path in "${SRC}/userpatches/extensions" "${EXTER}/extensions"; do
|
||
|
|
extension_dir="${extension_base_path}/${extension_name}"
|
||
|
|
extension_file_in_dir="${extension_dir}/${extension_name}.sh"
|
||
|
|
extension_floating_file="${extension_base_path}/${extension_name}.sh"
|
||
|
|
|
||
|
|
if [[ -d "${extension_dir}" ]] && [[ -f "${extension_file_in_dir}" ]]; then
|
||
|
|
extension_file="${extension_file_in_dir}"
|
||
|
|
break
|
||
|
|
elif [[ -f "${extension_floating_file}" ]]; then
|
||
|
|
extension_dir="${extension_base_path}" # this is misleading. only directory-based extensions should have this.
|
||
|
|
extension_file="${extension_floating_file}"
|
||
|
|
break
|
||
|
|
fi
|
||
|
|
done
|
||
|
|
|
||
|
|
# After that, we should either have extension_file and extension_dir, or throw.
|
||
|
|
if [[ ! -f "${extension_file}" ]]; then
|
||
|
|
echo "ERR: Extension problem -- cant find extension '${extension_name}' anywhere - called by ${BASH_SOURCE[1]}"
|
||
|
|
exit 17 # exit, forcibly. no way we can recover from this, and next extensions will get bogus errors as well.
|
||
|
|
fi
|
||
|
|
|
||
|
|
local before_function_list after_function_list new_function_list
|
||
|
|
|
||
|
|
# store a list of existing functions at this point, before sourcing the extension.
|
||
|
|
before_function_list="$(compgen -A function)"
|
||
|
|
|
||
|
|
# error handling during a 'source' call is quite insane in bash after 4.3.
|
||
|
|
# to be able to catch errors in sourced scripts the only way is to trap
|
||
|
|
declare -i extension_source_generated_error=0
|
||
|
|
trap 'extension_source_generated_error=1;' ERR
|
||
|
|
|
||
|
|
# source the file. extensions are not supposed to do anything except export variables and define functions, so nothing should happen here.
|
||
|
|
# there is no way to enforce it though, short of static analysis.
|
||
|
|
# we could punish the extension authors who violate it by removing some essential variables temporarily from the environment during this source, and restore them later.
|
||
|
|
# shellcheck disable=SC1090
|
||
|
|
source "${extension_file}"
|
||
|
|
|
||
|
|
# remove the trap we set.
|
||
|
|
trap - ERR
|
||
|
|
|
||
|
|
# decrement the recurse counter, so calls to this method are allowed again.
|
||
|
|
enable_extension_recurse_counter=$((enable_extension_recurse_counter - 1))
|
||
|
|
|
||
|
|
# test if it fell into the trap, and abort immediately with an error.
|
||
|
|
if [[ $extension_source_generated_error != 0 ]]; then
|
||
|
|
display_alert "Extension failed to load" "${extension_file}" "err"
|
||
|
|
exit 4
|
||
|
|
fi
|
||
|
|
|
||
|
|
# get a new list of functions after sourcing the extension
|
||
|
|
after_function_list="$(compgen -A function)"
|
||
|
|
|
||
|
|
# compare before and after, thus getting the functions defined by the extension.
|
||
|
|
# comm is oldskool. we like it. go "man comm" to understand -13 below
|
||
|
|
new_function_list="$(comm -13 <(echo "$before_function_list" | sort) <(echo "$after_function_list" | sort))"
|
||
|
|
|
||
|
|
# iterate over defined functions, store them in global associative array extension_function_info
|
||
|
|
for newly_defined_function in ${new_function_list}; do
|
||
|
|
extension_function_info["${newly_defined_function}"]="EXTENSION=\"${extension_name}\" EXTENSION_DIR=\"${extension_dir}\" EXTENSION_FILE=\"${extension_file}\" EXTENSION_ADDED_BY=\"${stacktrace}\""
|
||
|
|
done
|
||
|
|
|
||
|
|
# snapshot, then clear, the stack
|
||
|
|
local -a stack_snapshot=("${enable_extension_recurse_stack[@]}")
|
||
|
|
enable_extension_recurse_stack=()
|
||
|
|
|
||
|
|
# process the stacked snapshot, finally enabling the extensions
|
||
|
|
for stacked_extension in "${stack_snapshot[@]}"; do
|
||
|
|
ENABLE_EXTENSION_TRACE_HINT="RECURSE ${stacktrace} ->" enable_extension "${stacked_extension}"
|
||
|
|
done
|
||
|
|
|
||
|
|
}
|