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module Propellor.Property.Hostname where
import Propellor.Base
import qualified Propellor.Property.File as File
import Propellor.Property.Chroot (inChroot)
import Data.List
import Data.List.Utils
-- | Ensures that the hostname is set using best practices, to whatever
-- name the `Host` has.
--
-- Configures both </etc/hostname> and the current hostname.
-- (However, when used inside a chroot, avoids setting the current hostname
-- as that would impact the system outside the chroot.)
--
-- Configures </etc/mailname> with the domain part of the 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 UnixLike
sane = sane' extractDomain
sane' :: ExtractDomain -> Property UnixLike
sane' extractdomain = property' ("sane hostname") $ \w ->
ensureProperty w . setTo' extractdomain =<< asks hostName
-- Like `sane`, but you can specify the hostname to use, instead
-- of the default hostname of the `Host`.
setTo :: HostName -> Property UnixLike
setTo = setTo' extractDomain
setTo' :: ExtractDomain -> HostName -> Property UnixLike
setTo' extractdomain hn = combineProperties desc $ toProps
[ "/etc/hostname" `File.hasContent` [basehost]
, hostslines $ catMaybes
[ if null domain
then Nothing
else Just ("127.0.1.1", [hn, basehost])
, Just ("127.0.0.1", ["localhost"])
]
, check (not <$> inChroot) $
cmdProperty "hostname" [basehost]
`assume` NoChange
, "/etc/mailname" `File.hasContent`
[if null domain then hn else domain]
]
where
desc = "hostname " ++ hn
basehost = takeWhile (/= '.') hn
domain = extractdomain hn
hostslines ipsnames =
File.fileProperty desc (addhostslines ipsnames) "/etc/hosts"
addhostslines :: [(String, [String])] -> [String] -> [String]
addhostslines ipsnames ls =
let ips = map fst ipsnames
hasip l = maybe False (`elem` ips) (headMaybe (words l))
mkline (ip, names) = ip ++ "\t" ++ (unwords names)
in map mkline ipsnames ++ filter (not . hasip) ls
-- | Makes </etc/resolv.conf> contain search and domain lines for
-- the domain that the hostname is in.
searchDomain :: Property UnixLike
searchDomain = searchDomain' extractDomain
searchDomain' :: ExtractDomain -> Property UnixLike
searchDomain' extractdomain = property' desc $ \w ->
(ensureProperty w . go =<< asks hostName)
where
desc = "resolv.conf search and domain configured"
go hn =
let domain = extractdomain 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
-- | Function to extract the domain name from a HostName.
type ExtractDomain = HostName -> String
-- | hostname of foo.example.com has a domain of example.com.
-- But, when the hostname is example.com, the domain is
-- example.com too.
--
-- This doesn't work for eg, foo.co.uk, or when foo.sci.uni.edu
-- is in a sci.uni.edu subdomain. If you are in such a network,
-- provide your own ExtractDomain function to the properties above.
extractDomain :: ExtractDomain
extractDomain hn =
let bits = split "." hn
in intercalate "." $
if length bits > 2
then drop 1 bits
else bits
|
