rename HostLike to PropAccum

This is more general; it doesn't need to contain a Host.
It would, for example, be possible to make Property itself be an instance
of PropAccum.

propellor.cabal

@@ -108,7 +108,7 @@ Library
     Propellor.Property.SiteSpecific.GitHome
     Propellor.Property.SiteSpecific.JoeySites
     Propellor.Property.SiteSpecific.GitAnnexBuilder
-    Propellor.Host
+    Propellor.PropAccum
     Propellor.CmdLine
     Propellor.Info
     Propellor.Message

src/Propellor.hs

@@ -33,7 +33,7 @@ module Propellor (
 	  module Propellor.Types
 	, module Propellor.Property
 	, module Propellor.Property.Cmd
-	, module Propellor.Host
+	, module Propellor.PropAccum
 	, module Propellor.Info
 	, module Propellor.PrivData
 	, module Propellor.Types.PrivData
@@ -54,7 +54,7 @@ import Propellor.Types.PrivData
 import Propellor.Message
 import Propellor.Exception
 import Propellor.Info
-import Propellor.Host
+import Propellor.PropAccum
 
 import Utility.PartialPrelude as X
 import Utility.Process as X

src/Propellor/PropAccum.hs

@@ -1,6 +1,6 @@
 {-# LANGUAGE PackageImports #-}
 
-module Propellor.Host where
+module Propellor.PropAccum where
 
 import Data.Monoid
 
@@ -17,7 +17,7 @@ host :: HostName -> Host
 host hn = Host hn [] mempty
 
 -- | Something that can accumulate properties.
-class Hostlike h where
+class PropAccum h where
 	-- | Adds a property.
 	--
 	-- Can add Properties and RevertableProperties
@@ -29,17 +29,17 @@ class Hostlike h where
 	-- when it does.
 	(&^) :: IsProp p => h -> p -> h
 
-	getHost :: h -> Host
+	getProperties :: h -> [Property]
 
-instance Hostlike Host where
+instance PropAccum Host where
 	(Host hn ps is) &  p = Host hn (ps ++ [toProp p])
 		(is <> getInfoRecursive p)
 	(Host hn ps is) &^ p = Host hn ([toProp p] ++ ps)
 		(getInfoRecursive p <> is)
-	getHost h = h
+	getProperties = hostProperties
 
 -- | Adds a property in reverted form.
-(!) :: Hostlike h => h -> RevertableProperty -> h
+(!) :: PropAccum h => h -> RevertableProperty -> h
 h ! p = h & revert p
 
 infixl 1 &^
@@ -47,22 +47,22 @@ infixl 1 &
 infixl 1 !
 
 -- | Adjust the provided Property, adding to its
--- propertyChidren the properties of the Hostlike.
+-- propertyChidren the properties of the provided container.
 
 -- The Info of the propertyChildren is adjusted to only include 
 -- info that should be propigated out to the Property.
 --
--- DNS Info is propigated, so that eg, aliases of a Hostlike
+-- DNS Info is propigated, so that eg, aliases of a PropAccum
 -- are reflected in the dns for the host where it runs.
 --
 -- PrivData Info is propigated, so that properties used inside a
--- Hostlike will have the necessary PrivData available.
-propigateHostLike :: Hostlike hl => hl -> Property -> Property
-propigateHostLike hl prop = prop
+-- PropAccum will have the necessary PrivData available.
+propigateContainer :: PropAccum container => container -> Property -> Property
+propigateContainer c prop = prop
 	{ propertyChildren = propertyChildren prop ++ hostprops
 	}
   where
-	hostprops = map go $ hostProperties $ getHost hl
+	hostprops = map go $ getProperties c
 	go p = 
 		let i = propertyInfo p
 		in p

src/Propellor/Property/Chroot.hs

@@ -28,10 +28,10 @@ data BuilderConf
 	= UsingDeboostrap Debootstrap.DebootstrapConfig
 	deriving (Show)
 
-instance Hostlike Chroot where
+instance PropAccum Chroot where
 	(Chroot l s c h) & p = Chroot l s c (h & p)
 	(Chroot l s c h) &^ p = Chroot l s c (h &^ p)
-	getHost (Chroot _ _ _ h) = h
+	getProperties (Chroot _ _ _ h) = hostProperties h
 
 -- | Defines a Chroot at the given location, built with debootstrap.
 --
@@ -76,7 +76,7 @@ provisioned' propigator c@(Chroot loc system builderconf _) systemdonly = Revert
 	teardown = toProp (revert built)
 
 propigateChrootInfo :: Chroot -> Property -> Property
-propigateChrootInfo c p = propigateHostLike c p'
+propigateChrootInfo c p = propigateContainer c p'
   where
 	p' = p { propertyInfo = propertyInfo p <> chrootInfo c }
 

src/Propellor/Property/Docker.hs

@@ -77,10 +77,10 @@ type ContainerName = String
 -- | A docker container.
 data Container = Container Image Host
 
-instance Hostlike Container where
+instance PropAccum Container where
 	(Container i h) & p = Container i (h & p)
 	(Container i h) &^ p = Container i (h &^ p)
-	getHost (Container _ h) = h
+	getProperties (Container _ h) = hostProperties h
 
 -- | Defines a Container with a given name, image, and properties.
 -- Properties can be added to configure the Container.
@@ -134,7 +134,7 @@ docked ctr@(Container _ h) = RevertableProperty
 			]
 
 propigateContainerInfo :: Container -> Property -> Property
-propigateContainerInfo ctr@(Container _ h) p = propigateHostLike ctr p'
+propigateContainerInfo ctr@(Container _ h) p = propigateContainer ctr p'
   where
 	p' = p { propertyInfo = propertyInfo p <> dockerinfo }
 	dockerinfo = dockerInfo $

src/Propellor/Property/Systemd.hs

@@ -33,10 +33,10 @@ type MachineName = String
 data Container = Container MachineName Chroot.Chroot Host
 	deriving (Show)
 
-instance Hostlike Container where
+instance PropAccum Container where
 	(Container n c h) & p = Container n c (h & p)
 	(Container n c h) &^ p = Container n c (h &^ p)
-        getHost (Container _ _ h) = h
+	getProperties (Container _ _ h) = hostProperties h
 
 -- | Starts a systemd service.
 started :: ServiceName -> Property