sets ENV vars for various operating systems

set-os-vars.zsh

# Adapted from https://github.com/coto/server-easy-install/blob/master/lib/core.sh

lowercase(){
  echo "$1" | sed "y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/"
}

####################################################################
# Get System Info
####################################################################
OS=`lowercase \`uname\``
KERNEL=`uname -r`
MACH=`uname -m`

# for some reason, == is not behaving in this script
# I fixed it per these instructions:
# https://www.zsh.org/mla/users/2011/msg00161.html
if [ "${OS}" '==' "windowsnt" ]; then
  OS=windows
elif [ "${OS}" '==' "darwin" ]; then
  OS=macos
else
  if [ "${OS}" = "Linux" ] ; then
    if [ -f /etc/redhat-release ] ; then
      DISTRO_BASED_ON='redhat'
      DISTRO=`cat /etc/redhat-release |sed s/\ release.*//`
      PSEUDONAME=`cat /etc/redhat-release | sed s/.*\(// | sed s/\)//`
      REV=`cat /etc/redhat-release | sed s/.*release\ // | sed s/\ .*//`
    elif [ -f /etc/debian_version ] ; then
      export DISTRO_BASED_ON='debian'
      if [ -f /etc/lsb-release ] ; then
        DISTRO=`cat /etc/lsb-release | grep '^DISTRIB_ID' | awk -F=  '{ print $2 }'`
        PSEUDONAME=`cat /etc/lsb-release | grep '^DISTRIB_CODENAME' | awk -F=  '{ print $2 }'`
        REV=`cat /etc/lsb-release | grep '^DISTRIB_RELEASE' | awk -F=  '{ print $2 }'`
      fi
    fi
    #  readonly OS
    #  readonly DISTRO
    #  readonly DISTRO_BASED_ON
    #  readonly PSEUDONAME
    #  readonly REV
    #  readonly KERNEL
    #  readonly MACH
  fi
fi
echo "========"
echo "OS: $OS"
echo "DISTRO: $DISTRO"
echo "PSEUDONAME: $PSEUDONAME"
echo "REV: $REV"
echo "DISTRO_BASED_ON: $DISTRO_BASED_ON"
echo "KERNEL: $KERNEL"
echo "MACH: $MACH"
echo "========"

export OS="$OS"
export DISTRO="$DISTRO"
export DISTRO_BASED_ON="$DISTRO_BASED_ON"
export PSEUDONAME="$PSEUDONAME"
export REV="$REV"
export KERNEL="$KERNEL"
export MACH="$MACH"