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module Propellor.Property.Hostname where
import Propellor
import qualified Propellor.Property.File as File
-- | Sets the hostname. Configures both /etc/hostname and the current
-- hostname.
--
-- When provided with 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).
set :: HostName -> Property
set hostname = combineProperties desc go
`onChange` cmdProperty "hostname" [host]
where
desc = "hostname " ++ hostname
(host, domain) = separate (== '.') hostname
go = catMaybes
[ Just $ "/etc/hostname" `File.hasContent` [host]
, if null domain
then Nothing
else Just $ File.fileProperty desc
addhostline "/etc/hosts"
]
hostip = "127.0.1.1"
hostline = hostip ++ "\t" ++ hostname ++ " " ++ host
addhostline ls = hostline : filter (not . hashostip) ls
hashostip l = headMaybe (words l) == Just hostip
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