root / htools / htools.hs @ b37f4a76
History | View | Annotate | Download (2 kB)
1 |
{-| Main htools binary. |
---|---|
2 |
|
3 |
-} |
4 |
|
5 |
{- |
6 |
|
7 |
Copyright (C) 2011 Google Inc. |
8 |
|
9 |
This program is free software; you can redistribute it and/or modify |
10 |
it under the terms of the GNU General Public License as published by |
11 |
the Free Software Foundation; either version 2 of the License, or |
12 |
(at your option) any later version. |
13 |
|
14 |
This program is distributed in the hope that it will be useful, but |
15 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
16 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 |
General Public License for more details. |
18 |
|
19 |
You should have received a copy of the GNU General Public License |
20 |
along with this program; if not, write to the Free Software |
21 |
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
22 |
02110-1301, USA. |
23 |
|
24 |
-} |
25 |
|
26 |
module Main (main) where |
27 |
|
28 |
import Data.Char (toLower) |
29 |
import System.Environment |
30 |
import System.Exit |
31 |
import System.IO |
32 |
|
33 |
import Ganeti.HTools.Utils |
34 |
import qualified Ganeti.HTools.Program.Hail as Hail |
35 |
import qualified Ganeti.HTools.Program.Hbal as Hbal |
36 |
import qualified Ganeti.HTools.Program.Hscan as Hscan |
37 |
import qualified Ganeti.HTools.Program.Hspace as Hspace |
38 |
|
39 |
-- | Supported binaries. |
40 |
personalities :: [(String, IO ())] |
41 |
personalities = [ ("hail", Hail.main) |
42 |
, ("hbal", Hbal.main) |
43 |
, ("hscan", Hscan.main) |
44 |
, ("hspace", Hspace.main) |
45 |
] |
46 |
|
47 |
-- | Display usage and exit. |
48 |
usage :: String -> IO () |
49 |
usage name = do |
50 |
hPutStrLn stderr $ "Unrecognised personality '" ++ name ++ "'." |
51 |
hPutStrLn stderr "This program must be installed under one of the following\ |
52 |
\ names:" |
53 |
mapM_ (hPutStrLn stderr . (" - " ++) . fst) personalities |
54 |
hPutStrLn stderr "Please either rename/symlink the program or set\n\ |
55 |
\the environment variable HTOOLS to the desired role." |
56 |
exitWith $ ExitFailure 1 |
57 |
|
58 |
main :: IO () |
59 |
main = do |
60 |
binary <- getEnv "HTOOLS" `catch` const getProgName |
61 |
let name = map toLower binary |
62 |
boolnames = map (\(x, y) -> (x == name, y)) personalities |
63 |
select (usage name) boolnames |