propellor/Propellor/Property/Hostname.hs

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module Propellor.Property.Hostname where
import Propellor
import qualified Propellor.Property.File as File
-- | Ensures that the hostname is set to the HostAttr value.
-- Configures /etc/hostname and the current hostname.
--
-- A FQDN also configures /etc/hosts, with an entry for 127.0.1.1, which is
-- standard at least on Debian to set the FDQN (127.0.0.1 is localhost).
sane :: Property
sane = Property ("sane hostname") (ensureProperty . setTo =<< getHostName)
setTo :: HostName -> Property
setTo hn = combineProperties desc go
`onChange` cmdProperty "hostname" [basehost]
where
desc = "hostname " ++ hn
(basehost, domain) = separate (== '.') hn
go = catMaybes
[ Just $ "/etc/hostname" `File.hasContent` [basehost]
, if null domain
then Nothing
else Just $ File.fileProperty desc
addhostline "/etc/hosts"
]
hostip = "127.0.1.1"
hostline = hostip ++ "\t" ++ hn ++ " " ++ basehost
addhostline ls = hostline : filter (not . hashostip) ls
hashostip l = headMaybe (words l) == Just hostip