platform.sh

#
#  platform()
#
#  Determine and return the current
#  platform. Optionally return only the
#  OS name with -o/--OS, or only the
#  version with -v/--version.
#
function platform_ingestor() {
  local argv="$@";
  local -a uname;
  local -a uname_args=("" "a" "v" "r" "p" "m");

  local version;
  local OS;

  uname[0]="$(uname)";

  for (( i=1; i<${#uname_args[@]}; i++ )); do
    eval "uname[${i}]=\"\$(uname -\${uname_args[${i}]})\"";
  done

  case "${uname[0]}" in
    SunOS)
      OS="Solaris";
      case "${uname[3]}" in
        5.10)
          version="10.$(head -1 /etc/release | perl -p -e 's/.*x_u(\d+).*/\1/g')";
          ;;
        5.11)
          version="${uname[2]}";
          ;;
        *)
          version="unknown";
          ;;
      esac
      ;;
    Darwin)
      OS="mac-os-x";
      version="$(sw_vers -productVersion)";
      ;;
    Linux)
      OS="Linux";

      local lsb_all="$(lsb_release -a 2>&1 | grep -v "No LSB modules")";
      local lsb_release="$(lsb_release -r 2> /dev/null | awk '{print $2}')";

      case "$lsb_all" in
        *Ubuntu*)
          OS="$(echo $lsb_all | grep Distributor | awk '{print $3}')";
          version="$lsb_release";
          ;;
        *Red\ Hat*|*CentOS*|*command\ not\ found*)
          unset redhat;
          if [ ! -e "/etc/redhat-release" ]; then
            break;
          fi
          local redhat_version="$(cat /etc/redhat-release | perl -p -e 's/.* release (\d+(\.\d+)*).*/\1/')";
          OS="redhat";
          version="$redhat_version";
          ;;
        *Debian*)
          local debian_version="$(cat /etc/debian_version)";
          OS="Debian";
          version="$debian_version";
          ;;
        *)
          version="unknown";
          ;;
      esac
      ;;
    AIX)
      OS="AIX";
      version="${uname[2]}.${uname[3]}";
      ;;
    FreeBSD)
      OS="FreeBSD";
      version="$(echo "${uname[3]}" | perl -p -e 's/(\d+(\.\d+)*)-RELEASE.*/\1/')";
      ;;
    *)
      OS="unknown";
      version="unknown";
      ;;
  esac

  if [[ ! "${OS}" == "unknown" ]]; then
    # normalize the OS name to lowercase
    OS="$(lowercase ${OS})";
    # trim version to first 2 digits; open
    # to this changing.
    version="$(echo ${version} | cut -d. -f1,2)";
  fi

  if [[ "$argv" == *"-O"* ]] || [[ "$@" == *"--OS"* ]]; then
    echo "$OS";
  elif [[ "$argv" == *"-v"* ]] || [[ "$@" == *"--version"* ]]; then
    echo "$version";
  else
    echo "${OS}-${version}";
  fi

  platform="$OS";
  platform_version="$version";
}