systemctl

#!/bin/sh

SYSTEMCTL_PY="systemctl3.py"

get_cmd(){
  local cmd="$1"
  command -v "$cmd" || printf "${0%/*}/$cmd"
}

SYSTEMCTL=$(get_cmd $SYSTEMCTL_PY)
COMMAND="$SYSTEMCTL"

no_sudo_commands="-h --help --version version \
cat command default-services environment get-default \
get-preset help is-enabled list-dependencies \
list-start-dependencies list-unit-files listen log"

out() { printf "$1 $2\n" "${@:3}"; }
error() { out "==> ERROR:" "$@"; } >&2
die() { error "$@"; exit 1; }

ignore_error() {
  "$@" 2>/dev/null
  return 0
}

prepare(){
  [ ! -L "/tmp/run" ] && ln -sfr /tmp /tmp/run
  [ ! -x $SYSTEMCTL ] && die "${0##*/}: command not found: $SYSTEMCTL_PY"
  [ ! -x /usr/bin/python3 ] && die "${0##*/}: command not found: python3"
}

sudo_command(){
  if [ "$(id -u)" -ne 0 ] ; then
    if SUDO="$(which sudo)" ; then
      COMMAND="$SUDO $COMMAND"
    else
      die "Failed to ${@}: Interactive authentication required."
    fi
  fi
}

systemctl() {
  prepare
  [ -z "$1" ] && sudo_command

  case " $no_sudo_commands " in
  *" $1 "*)
    ;;
  *)
    sudo_command
    ;;
  esac

  exec ${COMMAND} "$@"
}

systemctl ${@}