stacktrace.shsource

#!/usr/bin/env bash
#*******************************************************************************
# Copyright (c) 2020 Eclipse Foundation and others.
# This program and the accompanying materials are made available
# under the terms of the Eclipse Public License 2.0
# which is available at http://www.eclipse.org/legal/epl-v20.html,
# or the MIT License which is available at https://opensource.org/licenses/MIT.
# SPDX-License-Identifier: EPL-2.0 OR MIT
#*******************************************************************************
#! /usr/bin/env bash

IFNDEF="$(echo "${BASH_SOURCE[@]}" | sha1sum | sed -E 's/^([^ ]*) .*$/import_\1/g')"
if [ -z "${!IFNDEF:-}" ]; then export "${IFNDEF}=1"

shopt -s extdebug
set -o errtrace

stacktrace() {
  declare -i frame=0 argv_offset=0
  IFS=" "
  if shopt -q extdebug ; then
    while : ; do
      read -r -a caller_info <<< "$(caller $frame)"
      declare -a argv=('')
      declare -i argc=0 frame_argc=0
      [[ $frame -lt ${#BASH_ARGC[@]} ]] && frame_argc=${BASH_ARGC[frame]}
      for ((frame_argc--,argc=0; frame_argc >= 0; argc++,frame_argc--)); do
        argv[argc]=${BASH_ARGV[argv_offset + frame_argc]}
        case "${argv[argc]}" in
          *[[:space:]]*) argv[argc]="'${argv[argc]}'" ;;
        esac
      done
      if [[ ${#caller_info[@]} -gt 0 ]] ; then
        printf "  at %s (%s:%s)\n" \
        "${caller_info[1]}" "${caller_info[2]}" "${caller_info[0]}"  | ERROR
      else
        printf "  Started with '%s %s %s %s'\n" \
          "$BASH" "-$-" "$0" "${argv[*]}" | ERROR
        break
      fi
      argv_offset=$((argv_offset + BASH_ARGC[frame]))
      frame=$((frame+1))
    done
  else
    # Pauper's stack trace without extdebug's provision of BASH_ARG*
    for fn in "${FUNCNAME[@]}"; do
      ((frame)) && printf "  at %s (%s:%s)\n" \
        "$fn" "${BASH_SOURCE[$frame]}" "${BASH_LINENO[$frame]}" | ERROR
      frame=$((frame+1))
    done
    printf "  Started with '%s %s %s'\n" \
          "$BASH" "-$-" "$0" | ERROR
  fi
}

trap 'FATAL "Unexpected error (exit code: $?)"; stacktrace >&2;' ERR

exit() {
    trap - ERR
    command exit "$@"
}

fi #IFNDEF