Add Munin module.

Signed-off-by: Jelmer Vernooij <jelmer@jelmer.uk>

src/Propellor/Property/Munin.hs

@@ -0,0 +1,57 @@
+-- | Maintainer: Jelmer Vernooij <jelmer@jelmer.uk>
+--
+module Propellor.Property.Munin (
+	hostListFragment,
+	hostListFragment',
+	nodePort,
+	nodeInstalled,
+	nodeRestarted,
+	nodeConfPath,
+	masterInstalled,
+	masterRestarted,
+	masterConfPath,
+) where
+
+import Propellor
+import qualified Propellor.Property.Apt as Apt
+import qualified Propellor.Property.Service as Service
+
+nodePort :: Integer
+nodePort = 4949
+
+nodeInstalled :: Property NoInfo
+nodeInstalled = Apt.serviceInstalledRunning "munin-node"
+
+nodeRestarted :: Property NoInfo
+nodeRestarted = Service.restarted "munin-node"
+
+nodeConfPath :: FilePath
+nodeConfPath = "/etc/munin/munin-node.conf"
+
+masterInstalled :: Property NoInfo
+masterInstalled = Apt.serviceInstalledRunning "munin"
+
+masterRestarted :: Property NoInfo
+masterRestarted = Service.restarted "munin"
+
+masterConfPath :: FilePath
+masterConfPath = "/etc/munin/munin.conf"
+
+
+-- | Create the host list fragment for master config.
+-- Takes an optional override list for hosts that are accessible on a non-standard host/port.
+-- TODO(jelmer): Only do this on hosts where munin is present (in other words, with Munin.installedNode)
+hostListFragment' :: [Host] -> [(HostName, (IPAddr, Port))] -> [String]
+hostListFragment' hs os = concatMap muninHost hs
+  where
+	muninHost :: Host -> [String]
+	muninHost h = [ "[" ++ (hostName h) ++ "]"
+		      , "  address " ++ maybe (hostName h) (fromIPAddr . fst) (hOverride h)
+		      ] ++ (maybe [] (\x -> ["  port " ++ (show $ fromPort $ snd x)]) (hOverride h)) ++ [""]
+	hOverride :: Host -> Maybe (IPAddr, Port)
+	hOverride h = lookup (hostName h) os
+	fromPort (Port p) = p
+
+-- | Create the host list fragment for master config.
+hostListFragment :: [Host] -> [String]
+hostListFragment hs = hostListFragment' hs []