propellor/src/Propellor/Engine.hs

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{-# LANGUAGE PackageImports #-}
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module Propellor.Engine where
import System.Exit
import System.IO
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import Data.Monoid
import Control.Applicative
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import System.Console.ANSI
import "mtl" Control.Monad.Reader
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import Propellor.Types
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import Propellor.Message
import Propellor.Exception
import Propellor.Attr
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runPropellor :: Host -> Propellor a -> IO a
runPropellor host a = runReaderT (runWithHost a) host
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mainProperties :: Host -> IO ()
mainProperties host = do
r <- runPropellor host $
ensureProperties [Property "overall" (ensureProperties $ hostProperties host) id]
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setTitle "propellor: done"
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hFlush stdout
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case r of
FailedChange -> exitWith (ExitFailure 1)
_ -> exitWith ExitSuccess
ensureProperties :: [Property] -> Propellor Result
ensureProperties ps = ensure ps NoChange
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where
ensure [] rs = return rs
ensure (l:ls) rs = do
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hn <- getHostName
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r <- actionMessageOn hn (propertyDesc l) (ensureProperty l)
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ensure ls (r <> rs)
ensureProperty :: Property -> Propellor Result
ensureProperty = catchPropellor . propertySatisfy
-- | Lifts an action into a different host.
--
-- For example, `fromHost hosts "otherhost" getSshPubKey`
fromHost :: [Host] -> HostName -> Propellor a -> Propellor (Maybe a)
fromHost l hn getter = case findHost l hn of
Nothing -> return Nothing
Just h -> liftIO $ Just <$>
runReaderT (runWithHost getter) h