#!/bin/sh
# output or sourcable

# OS
cdist_explore_os()
{
   [ -f /etc/arch-release ] && echo archlinux

   [ -f /etc/debian_version ] && echo debian

   grep -q ^DISTRIB_ID=Ubuntu /etc/lsb-release 2>/dev/null && echo ubuntu

}

# join those two if output needed
cdist_explore_os
CDIST_OS="$(cdist_explore_os)"