htools.hs 1.98 KB
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{-| Main htools binary.

-}

{-

Copyright (C) 2011 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 Data.Char (toLower)
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import System.Environment
import System.Exit
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import System.IO

import Ganeti.HTools.Utils
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import qualified Ganeti.HTools.Program.Hail as Hail
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import qualified Ganeti.HTools.Program.Hbal as Hbal
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import qualified Ganeti.HTools.Program.Hscan as Hscan
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import qualified Ganeti.HTools.Program.Hspace as Hspace
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-- | Supported binaries.
personalities :: [(String, IO ())]
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personalities = [ ("hail", Hail.main)
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                , ("hbal", Hbal.main)
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                , ("hscan", Hscan.main)
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                , ("hspace", Hspace.main)
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                ]
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-- | 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
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  binary <- getEnv "HTOOLS" `catch` const getProgName
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  let name = map toLower binary
      boolnames = map (\(x, y) -> (x == name, y)) personalities
  select (usage name) boolnames