#!/bin/sh

cmsos()
{
  # Determine the cpu architecture string.
  local cpuarch
  local version
  local os
  cpuarch=`uname -m`
  case $cpuarch in
    i*86) cpuarch=ia32 ;;
    x86_64) cpuarch=amd64 ;;
    *EMT*) cpuarch=amd64 ;;
    armv7l) cpuarch=armv7hl ;; # The kernel is armv7l, but we assume system as armv7hl (hard floats)
    *) ;;
  esac
 
  if [ "X$BUILD_ARCH" != X ]; then
      echo "$BUILD_ARCH"
  elif [ -f /etc/cmsos ] ; then
      echo "$(cat /etc/cmsos)_${cpuarch}"
  elif [ "X`uname`" = XLinux ]; then
    if [ -f /etc/SuSE-release ]; then
      echo suse`grep -i '^version' < /etc/SuSE-release | tr -dc '[0-9]'`
    elif [ -f /etc/fedora-release ]; then
      echo fc`sed 's/[^0-9]//g' /etc/fedora-release`_${cpuarch}
    elif egrep -q "Red Hat Enterprise|Scientific|CentOS" /etc/redhat-release 2>/dev/null; then
      version=`egrep "Red Hat Enterprise|Scientific|CentOS" /etc/redhat-release | sed 's/.*[rR]elease \([0-9]*\).*/\1/'`
      if [ "X`uname -i`" = Xi386 ]; then
        echo slc${version}_ia32
      else
        os="slc"
        if egrep -q "CentOS" /etc/redhat-release 2>/dev/null; then
          if [ ${version} -gt 7 ] ; then
            os="cc"
            if egrep -q " Stream " /etc/redhat-release 2>/dev/null; then
              os="cs"
            fi
          fi
        elif egrep -q "Red Hat Enterprise" /etc/redhat-release 2>/dev/null; then
          if [ ${version} -gt 7 ] ; then
            os="el"
          fi
        fi
        echo "${os}${version}_${cpuarch}"
      fi
    elif egrep -q "Alma\s*Linux" /etc/redhat-release 2>/dev/null; then
      version=`egrep "Alma\s*Linux" /etc/redhat-release | sed 's/.*[rR]elease \([0-9]*\).*/\1/'`
      echo "el${version}_${cpuarch}"
    elif egrep -q "Rocky\s*Linux" /etc/redhat-release 2>/dev/null; then
      version=`egrep "Rocky\s*Linux" /etc/redhat-release | sed 's/.*[rR]elease \([0-9]*\).*/\1/'`
      echo "el${version}_${cpuarch}"
    elif grep -q Scientific /etc/rocks-release 2>/dev/null; then
        version=`grep DISTRIB_RELEASE rocks-release | sed 's/DISTRIB_RELEASE="\([0-9]*\).*/\1/'`
        echo slc${version}_ia32
    elif grep -q PU_IAS /etc/redhat-release 2>/dev/null; then
         echo slc4_$cpuarch
    else
      archos= archosv=
      for f in debian_version slackware-version fedora-release \
  	     redhat-release altlinux-release gentoo-release \
  	     cobalt-release mandrake-release conectiva-release; do
        if [ -f /etc/$f ]; then
      	  archos=`echo $f | sed 's/[-_].*//'`
	  archosv=`tr -dc '[0-9]' < /etc/$f`
	  break
        fi
      done
      [ X$archos = Xredhat ] && archos=rh
      if [ -z "$archos" -o -z "$archosv" ]; then
        echo linux`uname -r | cut -d. -f1,2 | tr -d .`_$cpuarch
      else
        echo $archos$archosv_$cpuarch
      fi
    fi
  elif [ "X`uname`" = XDarwin ]; then
    case `sysctl hw.cpu64bit_capable | cut -f2 -d\ ` in 1) cpuarch=amd64;; 0) cpuarch=ia32;; esac
    echo osx`sw_vers -productVersion | cut -d. -f1,2 | tr -dc [0-9]`_$cpuarch
  elif [ "X`uname | cut -d_ -f1`" = XCYGWIN ]; then
    echo win32_$cpuarch
  else
    echo unsupported
  fi
}

cmsos