basic prosody support

Signed-off-by: Félix Sipma <felix.sipma@no-log.org>

propellor.cabal

@@ -87,6 +87,7 @@ Library
     Propellor.Property.Obnam
     Propellor.Property.OpenId
     Propellor.Property.Postfix
+    Propellor.Property.Prosody
     Propellor.Property.Reboot
     Propellor.Property.Scheduled
     Propellor.Property.Service

src/Propellor/Property/Prosody.hs

@@ -0,0 +1,52 @@
+module Propellor.Property.Prosody where
+
+import Propellor
+import qualified Propellor.Property.File as File
+import qualified Propellor.Property.Apt as Apt
+import qualified Propellor.Property.Service as Service
+import System.Posix.Files
+
+type ConfigFile = [String]
+
+type Conf = String
+
+confEnabled :: Conf -> ConfigFile -> RevertableProperty
+confEnabled conf cf = RevertableProperty enable disable
+  where
+	enable = check test prop
+		`describe` ("prosody conf enabled " ++ conf)
+		`requires` confAvailable conf cf
+		`requires` installed
+		`onChange` reloaded
+	  where
+		test = not <$> doesFileExist (confValPath conf)
+		prop = property "prosody conf in place" $ makeChange $
+			createSymbolicLink target dir
+		target = confValRelativePath conf
+		dir = confValPath conf
+		confValRelativePath conf' = "../conf.avail" </> conf' <.> "cfg.lua"
+	disable = trivial $ File.notPresent (confValPath conf)
+		`describe` ("prosody conf disabled " ++ conf)
+		`requires` installed
+		`onChange` reloaded
+
+confAvailable :: Conf -> ConfigFile -> Property
+confAvailable conf cf = ("prosody conf available " ++ conf) ==>
+	confAvailPath conf `File.hasContent` (comment : cf)
+  where
+	comment = "-- deployed with propellor, do not modify"
+
+confAvailPath :: Conf -> FilePath
+confAvailPath conf = "/etc/prosody/conf.avail" </> conf <.> "cfg.lua"
+
+confValPath :: Conf -> FilePath
+confValPath conf = "/etc/prosody/conf.d" </> conf <.> "cfg.lua"
+
+installed :: Property
+installed = Apt.installed ["prosody"]
+
+restarted :: Property
+restarted = Service.restarted "prosody"
+
+reloaded :: Property
+reloaded = Service.reloaded "prosody"