root / htools / htools.hs @ 22278fa7
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{-| Main htools binary. |
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-} |
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{- |
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Copyright (C) 2011, 2012 Google Inc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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02110-1301, USA. |
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-} |
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module Main (main) where |
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import Control.Exception |
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import Control.Monad (guard) |
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import Data.Char (toLower) |
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import Prelude hiding (catch) |
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import System.Environment |
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import System.Exit |
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import System.IO |
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import System.IO.Error (isDoesNotExistError) |
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import Ganeti.Utils |
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import Ganeti.HTools.CLI (parseOpts, genericOpts) |
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import Ganeti.HTools.Program (personalities) |
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-- | Display usage and exit. |
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usage :: String -> IO () |
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usage name = do |
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hPutStrLn stderr $ "Unrecognised personality '" ++ name ++ "'." |
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hPutStrLn stderr "This program must be installed under one of the following\ |
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\ names:" |
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mapM_ (hPutStrLn stderr . (" - " ++) . fst) personalities |
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hPutStrLn stderr "Please either rename/symlink the program or set\n\ |
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\the environment variable HTOOLS to the desired role." |
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exitWith $ ExitFailure 1 |
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main :: IO () |
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main = do |
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binary <- catchJust (guard . isDoesNotExistError) |
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(getEnv "HTOOLS") (const getProgName) |
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let name = map toLower binary |
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boolnames = map (\(x, y) -> (x == name, Just y)) personalities |
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case select Nothing boolnames of |
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Nothing -> usage name |
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Just (fn, options, arguments) -> do |
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cmd_args <- getArgs |
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(opts, args) <- parseOpts cmd_args name (options ++ genericOpts) |
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arguments |
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fn opts args |