root / htools / htools.hs @ 6a855aaa
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{-| Main htools binary. |
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-} |
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{- |
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Copyright (C) 2011 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 Data.Char (toLower) |
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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 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. |
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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. |
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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 <- getEnv "HTOOLS" `catch` const getProgName |
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let name = map toLower binary |
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boolnames = map (\(x, y) -> (x == name, y)) personalities |
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select (usage name) boolnames |