module Propellor.Property.Hostname where import Propellor import qualified Propellor.Property.File as File import Data.List -- | Ensures that the hostname is set using best practices. -- -- Configures /etc/hostname and the current hostname. -- -- /etc/hosts is also configured, with an entry for 127.0.1.1, which is -- standard at least on Debian to set the FDQN. -- -- Also, the /etc/hosts 127.0.0.1 line is set to localhost. Putting any -- other hostnames there is not best practices and can lead to annoying -- messages from eg, apache. sane :: Property sane = property ("sane hostname") (ensureProperty . setTo =<< asks hostName) setTo :: HostName -> Property setTo hn = combineProperties desc go where desc = "hostname " ++ hn (basehost, domain) = separate (== '.') hn go = catMaybes [ Just $ "/etc/hostname" `File.hasContent` [basehost] , if null domain then Nothing else Just $ trivial $ hostsline "127.0.1.1" [hn, basehost] , Just $ trivial $ hostsline "127.0.0.1" ["localhost"] , Just $ trivial $ cmdProperty "hostname" [basehost] ] hostsline ip names = File.fileProperty desc (addhostsline ip names) "/etc/hosts" addhostsline ip names ls = (ip ++ "\t" ++ (unwords names)) : filter (not . hasip ip) ls hasip ip l = headMaybe (words l) == Just ip -- | Makes /etc/resolv.conf contain search and domain lines for -- the domain that the hostname is in. searchDomain :: Property searchDomain = property desc (ensureProperty . go =<< asks hostName) where desc = "resolv.conf search and domain configured" go hn = let (_basehost, domain) = separate (== '.') hn in File.fileProperty desc (use domain) "/etc/resolv.conf" use domain ls = filter wanted $ nub (ls ++ cfgs) where cfgs = ["domain " ++ domain, "search " ++ domain] wanted l | l `elem` cfgs = True | "domain " `isPrefixOf` l = False | "search " `isPrefixOf` l = False | otherwise = True