Synnefo » snf-ganeti

{-| Main htools binary.

-}

{-

Copyright (C) 2011, 2012 Google Inc.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301, USA.

-}

module Main (main) where

import Control.Exception

import Control.Monad (guard)

import Data.Char (toLower)

import Prelude hiding (catch)

import System.Environment

import System.Exit

import System.IO

import System.IO.Error (isDoesNotExistError)

import Ganeti.HTools.Utils

import Ganeti.HTools.CLI (parseOpts)

import Ganeti.HTools.Program (personalities)

-- | Display usage and exit.

usage :: String -> IO ()

usage name = do

  hPutStrLn stderr $ "Unrecognised personality '" ++ name ++ "'."

  hPutStrLn stderr "This program must be installed under one of the following\

                   \ names:"

  mapM_ (hPutStrLn stderr . ("  - " ++) . fst) personalities

  hPutStrLn stderr "Please either rename/symlink the program or set\n\

                   \the environment variable HTOOLS to the desired role."

  exitWith $ ExitFailure 1

main :: IO ()

main = do

  binary <- catchJust (guard . isDoesNotExistError)

            (getEnv "HTOOLS") (const getProgName)

  let name = map toLower binary

      boolnames = map (\(x, y) -> (x == name, Just y)) personalities

  case select Nothing boolnames of

    Nothing -> usage name

    Just (fn, options) -> do

         cmd_args <- getArgs

         (opts, args) <- parseOpts cmd_args name options

         fn opts args