52 lines
1.5 KiB
Haskell
52 lines
1.5 KiB
Haskell
module Propellor.Property.Cmd (
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cmdProperty,
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cmdProperty',
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scriptProperty,
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serviceRunning,
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) where
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import Control.Monad
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import Control.Applicative
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import Data.List
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import Propellor.Types
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import Propellor.Engine
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import Utility.Monad
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import Utility.SafeCommand
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import Utility.Env
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-- | A property that can be satisfied by running a command.
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--
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-- The command must exit 0 on success.
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cmdProperty :: String -> [String] -> Property
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cmdProperty cmd params = cmdProperty' cmd params []
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-- | A property that can be satisfied by running a command,
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-- with added environment.
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cmdProperty' :: String -> [String] -> [(String, String)] -> Property
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cmdProperty' cmd params env = Property desc $ do
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env' <- addEntries env <$> getEnvironment
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ifM (boolSystemEnv cmd (map Param params) (Just env'))
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( return MadeChange
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, return FailedChange
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)
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where
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desc = unwords $ cmd : params
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-- | A property that can be satisfied by running a series of shell commands.
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scriptProperty :: [String] -> Property
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scriptProperty script = cmdProperty "sh" ["-c", shellcmd]
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where
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shellcmd = intercalate " ; " ("set -e" : script)
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-- | Ensures that a service is running.
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--
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-- Note that due to the general poor state of init scripts, the best
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-- we can do is try to start the service, and if it fails, assume
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-- this means it's already running.
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serviceRunning :: String -> Property
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serviceRunning svc = Property ("running " ++ svc) $ do
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void $ ensureProperty $
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scriptProperty ["service " ++ shellEscape svc ++ " start >/dev/null 2>&1 || true"]
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return NoChange
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