-- | Maintainer: Sean Whitton module Propellor.Property.Locale where import Propellor.Base import Propellor.Property.File import Data.List (isPrefixOf) type Locale = String type LocaleVariable = String -- | Select a locale for a list of global locale variables. -- -- A locale variable is of the form @LC_BLAH@, @LANG@ or @LANGUAGE@. See -- @locale(5)@. One might say -- -- > & "en_GB.UTF-8" `Locale.selectedFor` ["LC_PAPER", "LC_MONETARY"] -- -- to select the British English locale for paper size and currency conventions. -- -- Note that reverting this property does not make a locale unavailable. That's -- because it might be required for other Locale.selectedFor statements. selectedFor :: Locale -> [LocaleVariable] -> RevertableProperty NoInfo locale `selectedFor` vars = select deselect where select = check (not <$> isselected) select' `requires` available locale `describe` (locale ++ " locale selected") select' = cmdProperty "update-locale" selectArgs `assume` MadeChange deselect = check isselected deselect' `describe` (locale ++ " locale deselected") deselect' = cmdProperty "update-locale" vars `assume` MadeChange selectArgs = zipWith (++) vars (repeat ('=':locale)) isselected = locale `isSelectedFor` vars isSelectedFor :: Locale -> [LocaleVariable] -> IO Bool locale `isSelectedFor` vars = do ls <- catchDefaultIO [] $ lines <$> readFile "/etc/default/locale" return $ and $ map (\v -> v ++ "=" ++ locale `elem` ls) vars -- | Ensures a locale is generated (or, if reverted, ensure it's not). -- -- Fails if a locale is not available to be generated. That is, a commented out -- entry for the locale and an accompanying charset must be present in -- /etc/locale.gen. -- -- Per Debian bug #684134 we cannot ensure a locale is generated by means of -- Apt.reConfigure. So localeAvailable edits /etc/locale.gen manually. available :: Locale -> RevertableProperty NoInfo available locale = (ensureAvailable ensureUnavailable) where f = "/etc/locale.gen" desc = (locale ++ " locale generated") ensureAvailable = property desc $ (lines <$> (liftIO $ readFile f)) >>= \locales -> if locale `presentIn` locales then ensureProperty $ fileProperty desc (foldr uncomment []) f `onChange` regenerate else return FailedChange -- locale unavailable for generation ensureUnavailable = fileProperty (locale ++ " locale not generated") (foldr comment []) f `onChange` regenerate uncomment l ls = if ("# " ++ locale) `isPrefixOf` l then drop 2 l : ls else l:ls comment l ls = if locale `isPrefixOf` l then ("# " ++ l) : ls else l:ls l `presentIn` ls = any (l `isPrefix`) ls l `isPrefix` x = (l `isPrefixOf` x) || (("# " ++ l) `isPrefixOf` x) regenerate = cmdProperty "dpkg-reconfigure" ["-f", "noninteractive", "locales"] `assume` MadeChange