root / htools / htools.hs @ 559c4a98
History | View | Annotate | Download (2 kB)
1 |
{-| Main htools binary. |
---|---|
2 |
|
3 |
-} |
4 |
|
5 |
{- |
6 |
|
7 |
Copyright (C) 2011, 2012 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 Control.Exception |
29 |
import Control.Monad (guard) |
30 |
import Data.Char (toLower) |
31 |
import System.Environment |
32 |
import System.IO |
33 |
import System.IO.Error (isDoesNotExistError) |
34 |
|
35 |
import Ganeti.Utils |
36 |
import Ganeti.HTools.CLI (parseOpts, genericOpts) |
37 |
import Ganeti.HTools.Program (personalities) |
38 |
|
39 |
-- | Display usage and exit. |
40 |
usage :: String -> IO () |
41 |
usage name = do |
42 |
hPutStrLn stderr $ "Unrecognised personality '" ++ name ++ "'." |
43 |
hPutStrLn stderr "This program must be installed under one of the following\ |
44 |
\ names:" |
45 |
mapM_ (hPutStrLn stderr . (" - " ++) . fst) personalities |
46 |
exitErr "Please either rename/symlink the program or set\n\ |
47 |
\the environment variable HTOOLS to the desired role." |
48 |
|
49 |
main :: IO () |
50 |
main = do |
51 |
binary <- catchJust (guard . isDoesNotExistError) |
52 |
(getEnv "HTOOLS") (const getProgName) |
53 |
let name = map toLower binary |
54 |
boolnames = map (\(x, y) -> (x == name, Just y)) personalities |
55 |
case select Nothing boolnames of |
56 |
Nothing -> usage name |
57 |
Just (fn, options, arguments, _) -> do |
58 |
cmd_args <- getArgs |
59 |
real_options <- options |
60 |
(opts, args) <- parseOpts cmd_args name (real_options ++ genericOpts) |
61 |
arguments |
62 |
fn opts args |