Traverse directories recursively and run tf

traverse.sh

#!/usr/bin/env bash

set -Eeuo pipefail

# gather error codes
# https://gist.github.com/matti/3d2f04b1a9485a3a15d0267a68b341ba#gather-exit-codes-of-backgrounded-processes


export NO_COLOR="1"
export TF_CLI_ARGS="-no-color"

CMD="${1:-}"

_err() {
  >&2 echo -e "🔥 Error: $*"
}

_out() {
  >&2 echo -e "🚖 $*"
}

_usage() {
  >&2 cat << EOF
Usage: $0 <command>
$0 traverses the current directory and runs <command> in each of its subdirectories.
Some directories directories are skipped, such as directories starting with a
- dot, underscore,
- terraform, modules, bootstrap.
EOF
}

if [[ -z "${CMD}" ]]; then
  _usage
  exit 1
fi

if [[ ! -x ${CMD} ]]; then
  _err "Command '${CMD}' not found or not executable"
  exit 1
fi

_shutdown() {
  _warn "Shutdown.."
  trap '' TERM INT ERR # ignore traps when already shutting down

  >&2 echo "Subprocesses of current process group:"
  jobs

  >&2 echo "Kill current process group"
  kill 0

  >&2 echo "Waiting all remaining processess to exit"
  wait

  _info "Bye bye!"
  exit 0
}

_on_error() {
  trap '' ERR
  line_path=$(caller)
  line=${line_path% *}
  path=${line_path#* }

  >&2 echo -e "\n‼️  ERR $path:$line $BASH_COMMAND exited with $1"
  _shutdown
}

trap '_on_error $?' ERR
trap _shutdown TERM INT


_dirs_in_cwd() {
  find . -maxdepth 1 -mindepth 1 -type d | sort
}

_traverse() {
  local dir; dir="${1}"

  basenamed_dir="$(basename "${dir}")"
  case "${basenamed_dir}" in
    ".")
      # OK
    ;;
    .*|_*|terraform*|modules|bootstrap)
      return 0
    ;;
  esac


  >/dev/null pushd "${dir}"

  tf plan

  for d in $(_dirs_in_cwd); do
    local basename_d
    basename_d="$(basename "${d}")"
    (
      _traverse "${d}"
    ) 2>&1 | sed -le "s#^#/${basename_d}#;" &
  done

  wait
}

_traverse .

wait

echo "All subshells have completed"