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