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