#!/bin/sh -e

if test "$#" -eq 0 ; then
  echo 'printcontenv: fatal: too few arguments' 1>&2
  exit 100
fi

if test "0$S6_KEEP_ENV" -ne 0 ; then
  eval var=\$$1
  if test -z "$var" ; then
    return 1
  else
    exec s6-echo -- "$var"
  fi
else
  exec 2>/dev/null
  s6-cat < "/run/s6/container_environment/$1" && echo
fi