diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,18 @@
+propellor (0.3.0) unstable; urgency=medium
+
+  * ipv6to4: Ensure interface is brought up automatically on boot.
+  * Enabling unattended upgrades now ensures that cron is installed and
+    running to perform them.
+  * Properties can be scheduled to only be checked after a given time period.
+  * Fix bootstrapping of dependencies.
+  * Fix compilation on Debian stable.
+  * Include security updates in sources.list for stable and testing.
+  * Use ssh connection caching, especially when bootstrapping.
+  * Properties now run in a Propellor monad, which provides access to
+    attributes of the host.
+
+ -- Joey Hess <joeyh@debian.org>  Fri, 11 Apr 2014 01:19:05 -0400
+
 propellor (0.2.3) unstable; urgency=medium
 
   * docker: Fix laziness bug that caused running containers to be
diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,8 @@
 	ln -sf dist/build/config/config propellor
 
 deps:
-	@if [ $$(whoami) = root ]; then apt-get -y install gnupg ghc cabal-install libghc-missingh-dev libghc-ansi-terminal-dev libghc-ifelse-dev libghc-unix-compat-dev libghc-hslogger-dev libghc-network-dev libghc-async-dev; fi || true
+	@if [ $$(whoami) = root ]; then apt-get --no-upgrade --no-install-recommends -y install gnupg ghc cabal-install libghc-missingh-dev libghc-ansi-terminal-dev libghc-ifelse-dev libghc-unix-compat-dev libghc-hslogger-dev libghc-network-dev libghc-quickcheck2-dev libghc-mtl-dev libghc-monadcatchio-transformers-dev; fi || true
+	@if [ $$(whoami) = root ]; then apt-get --no-upgrade --no-install-recommends -y install libghc-async-dev || cabal update; cabal install async; fi || true
 
 dist/setup-config: propellor.cabal
 	if [ "$(CABAL)" = ./Setup ]; then ghc --make Setup; fi
diff --git a/Propellor.hs b/Propellor.hs
--- a/Propellor.hs
+++ b/Propellor.hs
@@ -1,7 +1,10 @@
+{-# LANGUAGE PackageImports #-}
+
 -- | Pulls in lots of useful modules for building and using Properties.
 -- 
--- Propellor enures that the system it's run in satisfies a list of
--- properties, taking action as necessary when a property is not yet met.
+-- When propellor runs on a Host, it ensures that its list of Properties
+-- is satisfied, taking action as necessary when a Property is not
+-- currently satisfied.
 --
 -- A simple propellor program example:
 --
@@ -11,15 +14,16 @@
 -- > import qualified Propellor.Property.Apt as Apt
 -- > 
 -- > main :: IO ()
--- > main = defaultMain getProperties
+-- > main = defaultMain hosts
 -- > 
--- > getProperties :: HostName -> Maybe [Property]
--- > getProperties "example.com" = Just
--- >    [ Apt.installed ["mydaemon"]
--- >    , "/etc/mydaemon.conf" `File.containsLine` "secure=1"
--- >        `onChange` cmdProperty "service" ["mydaemon", "restart"]
--- >    ]
--- > getProperties _ = Nothing
+-- > hosts :: [Host]
+-- > hosts =
+-- >   [ host "example.com"
+-- >     & Apt.installed ["mydaemon"]
+-- >     & "/etc/mydaemon.conf" `File.containsLine` "secure=1"
+-- >       `onChange` cmdProperty "service" ["mydaemon", "restart"]
+-- >     ! Apt.installed ["unwantedpackage"]
+-- >   ]
 --
 -- See config.hs for a more complete example, and clone Propellor's
 -- git repository for a deployable system using Propellor:
@@ -29,8 +33,10 @@
 	  module Propellor.Types
 	, module Propellor.Property
 	, module Propellor.Property.Cmd
+	, module Propellor.Attr
 	, module Propellor.PrivData
 	, module Propellor.Engine
+	, module Propellor.Exception
 	, module Propellor.Message
 	, localdir
 
@@ -43,6 +49,8 @@
 import Propellor.Property.Cmd
 import Propellor.PrivData
 import Propellor.Message
+import Propellor.Exception
+import Propellor.Attr
 
 import Utility.PartialPrelude as X
 import Utility.Process as X
@@ -62,6 +70,7 @@
 import Control.Monad as X
 import Data.Monoid as X
 import Control.Monad.IfElse as X
+import "mtl" Control.Monad.Reader as X
 
 -- | This is where propellor installs itself when deploying a host.
 localdir :: FilePath
diff --git a/Propellor/Attr.hs b/Propellor/Attr.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Attr.hs
@@ -0,0 +1,47 @@
+{-# LANGUAGE PackageImports #-}
+
+module Propellor.Attr where
+
+import Propellor.Types
+import Propellor.Types.Attr
+
+import "mtl" Control.Monad.Reader
+import qualified Data.Set as S
+import qualified Data.Map as M
+
+pureAttrProperty :: Desc -> (Attr -> Attr) -> AttrProperty 
+pureAttrProperty desc = AttrProperty $ Property ("has " ++ desc)
+	(return NoChange)
+
+hostname :: HostName -> AttrProperty
+hostname name = pureAttrProperty ("hostname " ++ name) $
+	\d -> d { _hostname = name }
+
+getHostName :: Propellor HostName
+getHostName = asks _hostname
+
+cname :: Domain -> AttrProperty
+cname domain = pureAttrProperty ("cname " ++ domain) (addCName domain)
+
+cnameFor :: IsProp p => Domain -> (Domain -> p) -> AttrProperty
+cnameFor domain mkp =
+	let p = mkp domain
+	in AttrProperty p (addCName domain)
+
+addCName :: HostName -> Attr -> Attr
+addCName domain d = d { _cnames = S.insert domain (_cnames d) }
+
+hostnameless :: Attr
+hostnameless = newAttr (error "hostname Attr not specified")
+
+hostAttr :: Host -> Attr
+hostAttr (Host _ mkattrs) = mkattrs hostnameless
+
+hostProperties :: Host -> [Property]
+hostProperties (Host ps _) = ps
+
+hostMap :: [Host] -> M.Map HostName Host
+hostMap l = M.fromList $ zip (map (_hostname . hostAttr) l) l 
+
+findHost :: [Host] -> HostName -> Maybe Host
+findHost l hn = M.lookup hn (hostMap l)
diff --git a/Propellor/CmdLine.hs b/Propellor/CmdLine.hs
--- a/Propellor/CmdLine.hs
+++ b/Propellor/CmdLine.hs
@@ -16,6 +16,7 @@
 import qualified Propellor.Property.Docker.Shim as DockerShim
 import Utility.FileMode
 import Utility.SafeCommand
+import Utility.UserInfo
 
 usage :: IO a
 usage = do
@@ -54,8 +55,8 @@
 			else return $ Run s
 	go _ = usage
 
-defaultMain :: [HostName -> Maybe [Property]] -> IO ()
-defaultMain getprops = do
+defaultMain :: [Host] -> IO ()
+defaultMain hostlist = do
 	DockerShim.cleanEnv
 	checkDebugMode
 	cmdline <- processCmdLine
@@ -63,23 +64,26 @@
 	go True cmdline
   where
 	go _ (Continue cmdline) = go False cmdline
-	go _ (Set host field) = setPrivData host field
+	go _ (Set hn field) = setPrivData hn field
 	go _ (AddKey keyid) = addKey keyid
-	go _ (Chain host) = withprops host $ \ps -> do
-		r <- ensureProperties' ps
+	go _ (Chain hn) = withprops hn $ \attr ps -> do
+		r <- runPropellor attr $ ensureProperties ps
 		putStrLn $ "\n" ++ show r
-	go _ (Docker host) = Docker.chain host
+	go _ (Docker hn) = Docker.chain hn
 	go True cmdline@(Spin _) = buildFirst cmdline $ go False cmdline
 	go True cmdline = updateFirst cmdline $ go False cmdline
-	go False (Spin host) = withprops host $ const $ spin host
-	go False (Run host) = ifM ((==) 0 <$> getRealUserID)
-		( onlyProcess $ withprops host ensureProperties
-		, go True (Spin host)
+	go False (Spin hn) = withprops hn $ const . const $ spin hn
+	go False (Run hn) = ifM ((==) 0 <$> getRealUserID)
+		( onlyProcess $ withprops hn mainProperties
+		, go True (Spin hn)
 		)
-	go False (Boot host) = onlyProcess $ withprops host $ boot
+	go False (Boot hn) = onlyProcess $ withprops hn boot
 
-	withprops host a = maybe (unknownhost host) a $
-		headMaybe $ catMaybes $ map (\get -> get host) getprops
+	withprops :: HostName -> (Attr -> [Property] -> IO ()) -> IO ()
+	withprops hn a = maybe
+		(unknownhost hn)
+		(\h -> a (hostAttr h) (hostProperties h))
+		(findHost hostlist hn)
 
 onlyProcess :: IO a -> IO a
 onlyProcess a = bracket lock unlock (const a)
@@ -95,7 +99,7 @@
 
 unknownhost :: HostName -> IO a
 unknownhost h = errorMessage $ unlines
-	[ "Unknown host: " ++ h
+	[ "Propellor does not know about host: " ++ h
 	, "(Perhaps you should specify the real hostname on the command line?)"
 	, "(Or, edit propellor's config.hs to configure this host)"
 	]
@@ -163,15 +167,16 @@
 getCurrentGitSha1 branchref = readProcess "git" ["show-ref", "--hash", branchref]
 
 spin :: HostName -> IO ()
-spin host = do
+spin hn = do
 	url <- getUrl
 	void $ gitCommit [Param "--allow-empty", Param "-a", Param "-m", Param "propellor spin"]
 	void $ boolSystem "git" [Param "push"]
-	go url =<< gpgDecrypt (privDataFile host)
+	cacheparams <- toCommand <$> sshCachingParams hn
+	go cacheparams url =<< gpgDecrypt (privDataFile hn)
   where
-	go url privdata = withBothHandles createProcessSuccess (proc "ssh" [user, bootstrapcmd]) $ \(toh, fromh) -> do
+	go cacheparams url privdata = withBothHandles createProcessSuccess (proc "ssh" $ cacheparams ++ [user, bootstrapcmd]) $ \(toh, fromh) -> do
 		let finish = do
-			senddata toh (privDataFile host) privDataMarker privdata
+			senddata toh (privDataFile hn) privDataMarker privdata
 			hClose toh
 			
 			-- Display remaining output.
@@ -184,21 +189,21 @@
 			NeedGitClone -> do
 				hClose toh
 				hClose fromh
-				sendGitClone host url
-				go url privdata
+				sendGitClone hn url
+				go cacheparams url privdata
 	
-	user = "root@"++host
+	user = "root@"++hn
 
 	bootstrapcmd = shellWrap $ intercalate " ; "
 		[ "if [ ! -d " ++ localdir ++ " ]"
 		, "then " ++ intercalate " && "
-			[ "apt-get -y install git"
+			[ "apt-get --no-install-recommends --no-upgrade -y install git make"
 			, "echo " ++ toMarked statusMarker (show NeedGitClone)
 			]
 		, "else " ++ intercalate " && "
 			[ "cd " ++ localdir
-			, "if ! test -x ./propellor; then make build; fi"
-			, "./propellor --boot " ++ host
+			, "if ! test -x ./propellor; then make deps build; fi"
+			, "./propellor --boot " ++ hn
 			]
 		, "fi"
 		]
@@ -214,19 +219,18 @@
 	
 	showremote s = putStrLn s
 	senddata toh f marker s = void $
-		actionMessage ("Sending " ++ f ++ " (" ++ show (length s) ++ " bytes) to " ++ host) $ do
+		actionMessage ("Sending " ++ f ++ " (" ++ show (length s) ++ " bytes) to " ++ hn) $ do
 			sendMarked toh marker s
 			return True
 
 sendGitClone :: HostName -> String -> IO ()
-sendGitClone host url = void $ actionMessage ("Pushing git repository to " ++ host) $ do
+sendGitClone hn url = void $ actionMessage ("Pushing git repository to " ++ hn) $ do
 	branch <- getCurrentBranch
+	cacheparams <- sshCachingParams hn
 	withTmpFile "propellor.git" $ \tmp _ -> allM id
-		-- TODO: ssh connection caching, or better push method
-		-- with less connections.
 		[ boolSystem "git" [Param "bundle", Param "create", File tmp, Param "HEAD"]
-		, boolSystem "scp" [File tmp, Param ("root@"++host++":"++remotebundle)]
-		, boolSystem "ssh" [Param ("root@"++host), Param $ unpackcmd branch]
+		, boolSystem "scp" $ cacheparams ++ [File tmp, Param ("root@"++hn++":"++remotebundle)]
+		, boolSystem "ssh" $ cacheparams ++ [Param ("root@"++hn), Param $ unpackcmd branch]
 		]
   where
 	remotebundle = "/usr/local/propellor.git"
@@ -274,15 +278,15 @@
 	len = length marker
 	matches = filter (marker `isPrefixOf`) $ lines s
 
-boot :: [Property] -> IO ()
-boot ps = do
+boot :: Attr -> [Property] -> IO ()
+boot attr ps = do
 	sendMarked stdout statusMarker $ show Ready
 	reply <- hGetContentsStrict stdin
 
 	makePrivDataDir
 	maybe noop (writeFileProtected privDataLocal) $
 		fromMarked privDataMarker reply
-	ensureProperties ps
+	mainProperties attr ps
 
 addKey :: String -> IO ()
 addKey keyid = exitBool =<< allM id [ gpg, gitadd, gitcommit ]
@@ -341,3 +345,15 @@
 			updateGlobalLogger rootLoggerName $ 
 				setLevel DEBUG .  setHandlers [f]
 	go _ = noop
+
+-- Parameters can be passed to both ssh and scp.
+sshCachingParams :: HostName -> IO [CommandParam]
+sshCachingParams hn = do
+	home <- myHomeDir
+	let cachedir = home </> ".ssh" </> "propellor"
+	createDirectoryIfMissing False cachedir
+	let socketfile = cachedir </> hn ++ ".sock"
+	return
+		[ Param "-o", Param ("ControlPath=" ++ socketfile)
+		, Params "-o ControlMaster=auto -o ControlPersist=yes"
+		]
diff --git a/Propellor/Engine.hs b/Propellor/Engine.hs
--- a/Propellor/Engine.hs
+++ b/Propellor/Engine.hs
@@ -1,30 +1,37 @@
+{-# LANGUAGE PackageImports #-}
+
 module Propellor.Engine where
 
 import System.Exit
 import System.IO
 import Data.Monoid
 import System.Console.ANSI
+import "mtl" Control.Monad.Reader
 
 import Propellor.Types
 import Propellor.Message
-import Utility.Exception
+import Propellor.Exception
 
-ensureProperty :: Property -> IO Result
-ensureProperty = catchDefaultIO FailedChange . propertySatisfy
+runPropellor :: Attr -> Propellor a -> IO a
+runPropellor attr a = runReaderT (runWithAttr a) attr
 
-ensureProperties :: [Property] -> IO ()
-ensureProperties ps = do
-	r <- ensureProperties' [Property "overall" $ ensureProperties' ps]
+mainProperties :: Attr -> [Property] -> IO ()
+mainProperties attr ps = do
+	r <- runPropellor attr $
+		ensureProperties [Property "overall" $ ensureProperties ps]
 	setTitle "propellor: done"
 	hFlush stdout
 	case r of
 		FailedChange -> exitWith (ExitFailure 1)
 		_ -> exitWith ExitSuccess
 
-ensureProperties' :: [Property] -> IO Result
-ensureProperties' ps = ensure ps NoChange
+ensureProperties :: [Property] -> Propellor Result
+ensureProperties ps = ensure ps NoChange
   where
 	ensure [] rs = return rs
 	ensure (l:ls) rs = do
 		r <- actionMessage (propertyDesc l) (ensureProperty l)
 		ensure ls (r <> rs)
+
+ensureProperty :: Property -> Propellor Result
+ensureProperty = catchPropellor . propertySatisfy
diff --git a/Propellor/Exception.hs b/Propellor/Exception.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Exception.hs
@@ -0,0 +1,16 @@
+{-# LANGUAGE PackageImports #-}
+
+module Propellor.Exception where
+
+import qualified "MonadCatchIO-transformers" Control.Monad.CatchIO as M
+import Control.Exception
+import Control.Applicative
+
+import Propellor.Types
+
+-- | Catches IO exceptions and returns FailedChange.
+catchPropellor :: Propellor Result -> Propellor Result
+catchPropellor a = either (\_ -> FailedChange) id <$> tryPropellor a
+
+tryPropellor :: Propellor a -> Propellor (Either IOException a)
+tryPropellor = M.try
diff --git a/Propellor/Message.hs b/Propellor/Message.hs
--- a/Propellor/Message.hs
+++ b/Propellor/Message.hs
@@ -1,30 +1,35 @@
+{-# LANGUAGE PackageImports #-}
+
 module Propellor.Message where
 
 import System.Console.ANSI
 import System.IO
 import System.Log.Logger
+import "mtl" Control.Monad.Reader
 
 import Propellor.Types
 
 -- | Shows a message while performing an action, with a colored status
 -- display.
-actionMessage :: ActionResult r => Desc -> IO r -> IO r
+actionMessage :: (MonadIO m, ActionResult r) => Desc -> m r -> m r
 actionMessage desc a = do
-	setTitle $ "propellor: " ++ desc
-	hFlush stdout
+	liftIO $ do
+		setTitle $ "propellor: " ++ desc
+		hFlush stdout
 
 	r <- a
 
-	setTitle "propellor: running"
-	let (msg, intensity, color) = getActionResult r
-	putStr $ desc ++ " ... "
-	colorLine intensity color msg
-	hFlush stdout
+	liftIO $ do
+		setTitle "propellor: running"
+		let (msg, intensity, color) = getActionResult r
+		putStr $ desc ++ " ... "
+		colorLine intensity color msg
+		hFlush stdout
 
 	return r
 
-warningMessage :: String -> IO ()
-warningMessage s = colorLine Vivid Red $ "** warning: " ++ s
+warningMessage :: MonadIO m => String -> m ()
+warningMessage s = liftIO $ colorLine Vivid Red $ "** warning: " ++ s
 
 colorLine :: ColorIntensity -> Color -> String -> IO ()
 colorLine intensity color msg = do
diff --git a/Propellor/PrivData.hs b/Propellor/PrivData.hs
--- a/Propellor/PrivData.hs
+++ b/Propellor/PrivData.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE PackageImports #-}
+
 module Propellor.PrivData where
 
 import qualified Data.Map as M
@@ -7,8 +9,10 @@
 import System.Directory
 import Data.Maybe
 import Control.Monad
+import "mtl" Control.Monad.Reader
 
 import Propellor.Types
+import Propellor.Attr
 import Propellor.Message
 import Utility.Monad
 import Utility.PartialPrelude
@@ -18,12 +22,15 @@
 import Utility.SafeCommand
 import Utility.Misc
 
-withPrivData :: PrivDataField -> (String -> IO Result) -> IO Result
-withPrivData field a = maybe missing a =<< getPrivData field
+withPrivData :: PrivDataField -> (String -> Propellor Result) -> Propellor Result
+withPrivData field a = maybe missing a =<< liftIO (getPrivData field)
   where
 	missing = do
-		warningMessage $ "Missing privdata " ++ show field
-		return FailedChange
+		host <- getHostName
+		liftIO $ do
+			warningMessage $ "Missing privdata " ++ show field
+			putStrLn $ "Fix this by running: propellor --set "++host++" '" ++ show field ++ "'"
+			return FailedChange
 
 getPrivData :: PrivDataField -> IO (Maybe String)
 getPrivData field = do
diff --git a/Propellor/Property.hs b/Propellor/Property.hs
--- a/Propellor/Property.hs
+++ b/Propellor/Property.hs
@@ -1,17 +1,22 @@
+{-# LANGUAGE PackageImports #-}
+
 module Propellor.Property where
 
 import System.Directory
 import Control.Monad
 import Data.Monoid
+import Control.Monad.IfElse
+import "mtl" Control.Monad.Reader
 
 import Propellor.Types
+import Propellor.Types.Attr
 import Propellor.Engine
 import Utility.Monad
 
-makeChange :: IO () -> IO Result
-makeChange a = a >> return MadeChange
+makeChange :: IO () -> Propellor Result
+makeChange a = liftIO a >> return MadeChange
 
-noChange :: IO Result
+noChange :: Propellor Result
 noChange = return NoChange
 
 -- | Combines a list of properties, resulting in a single property
@@ -19,7 +24,7 @@
 -- and print out the description of each as it's run. Does not stop
 -- on failure; does propigate overall success/failure.
 propertyList :: Desc -> [Property] -> Property
-propertyList desc ps = Property desc $ ensureProperties' ps
+propertyList desc ps = Property desc $ ensureProperties ps
 
 -- | Combines a list of properties, resulting in one property that
 -- ensures each in turn, stopping on failure.
@@ -33,18 +38,29 @@
 			FailedChange -> return FailedChange
 			_ -> go ls (r <> rs)
 
+-- | Combines together two properties, resulting in one property
+-- that ensures the first, and if the first succeeds, ensures the second.
+-- The property uses the description of the first property.
+before :: Property -> Property -> Property
+p1 `before` p2 = Property (propertyDesc p1) $ do
+	r <- ensureProperty p1
+	case r of
+		FailedChange -> return FailedChange
+		_ -> ensureProperty p2
+
 -- | Makes a perhaps non-idempotent Property be idempotent by using a flag
 -- file to indicate whether it has run before.
 -- Use with caution.
 flagFile :: Property -> FilePath -> Property
 flagFile property flagfile = Property (propertyDesc property) $
-	go =<< doesFileExist flagfile
+	go =<< liftIO (doesFileExist flagfile)
   where
 	go True = return NoChange
 	go False = do
 		r <- ensureProperty property
-		when (r == MadeChange) $
-			writeFile flagfile ""
+		when (r == MadeChange) $ liftIO $ 
+			unlessM (doesFileExist flagfile) $
+				writeFile flagfile ""
 		return r
 
 --- | Whenever a change has to be made for a Property, causes a hook
@@ -64,13 +80,13 @@
 
 -- | Makes a Property only be performed when a test succeeds.
 check :: IO Bool -> Property -> Property
-check c property = Property (propertyDesc property) $ ifM c
+check c property = Property (propertyDesc property) $ ifM (liftIO c)
 	( ensureProperty property
 	, return NoChange
 	)
 
 boolProperty :: Desc -> IO Bool -> Property
-boolProperty desc a = Property desc $ ifM a
+boolProperty desc a = Property desc $ ifM (liftIO a)
 	( return MadeChange
 	, return FailedChange
 	)
@@ -79,17 +95,26 @@
 revert :: RevertableProperty -> RevertableProperty
 revert (RevertableProperty p1 p2) = RevertableProperty p2 p1
 
--- | Starts a list of Properties
-props :: [Property]
-props = []
+-- | Starts accumulating the properties of a Host.
+--
+-- > host "example.com"
+-- > 	& someproperty
+-- > 	! oldproperty
+-- > 	& otherproperty
+host :: HostName -> Host
+host hn = Host [] (\_ -> newAttr hn)
 
--- | Adds a property to the list.
--- Can add both Properties and RevertableProperties.
-(&) :: IsProp p => [Property] -> p -> [Property]
-ps & p = ps ++ [toProp p]
+-- | Adds a property to a Host
+-- Can add Properties, RevertableProperties, and AttrProperties
+(&) :: IsProp p => Host -> p -> Host
+(Host ps as) & p = Host (ps ++ [toProp p]) (getAttr p . as)
+
 infixl 1 &
 
--- | Adds a property to the list in reverted form.
-(!) :: [Property] -> RevertableProperty -> [Property]
-ps ! p = ps ++ [toProp $ revert p]
+-- | Adds a property to the Host in reverted form.
+(!) :: Host -> RevertableProperty -> Host
+(Host ps as) ! p = Host (ps ++ [toProp q]) (getAttr q . as)
+  where
+	q = revert p
+
 infixl 1 !
diff --git a/Propellor/Property/Apt.hs b/Propellor/Property/Apt.hs
--- a/Propellor/Property/Apt.hs
+++ b/Propellor/Property/Apt.hs
@@ -8,6 +8,7 @@
 
 import Propellor
 import qualified Propellor.Property.File as File
+import qualified Propellor.Property.Service as Service
 import Propellor.Property.File (Line)
 
 sourcesList :: FilePath
@@ -46,13 +47,22 @@
 kernelOrg :: DebianSuite -> [Line]
 kernelOrg = binandsrc "http://mirrors.kernel.org/debian"
 
+-- | Only available for Stable and Testing
+securityUpdates :: DebianSuite -> [Line]
+securityUpdates suite
+	| suite == Stable || suite == Testing =
+		let l = "deb http://security.debian.org/ " ++ showSuite suite ++ "/updates " ++ unwords stdSections
+		in [l, srcLine l]
+	| otherwise = []
+
 -- | Makes sources.list have a standard content using the mirror CDN,
 -- with a particular DebianSuite.
 --
 -- Since the CDN is sometimes unreliable, also adds backup lines using
 -- kernel.org.
 stdSourcesList :: DebianSuite -> Property
-stdSourcesList suite = setSourcesList (debCdn suite ++ kernelOrg suite)
+stdSourcesList suite = setSourcesList
+	(debCdn suite ++ kernelOrg suite ++ securityUpdates suite)
 	`describe` ("standard sources.list for " ++ show suite)
 
 setSourcesList :: [Line] -> Property
@@ -147,9 +157,12 @@
 
 -- | Enables unattended upgrades. Revert to disable.
 unattendedUpgrades :: RevertableProperty
-unattendedUpgrades = RevertableProperty (go True) (go False)
+unattendedUpgrades = RevertableProperty enable disable
   where
-	go enabled = (if enabled then installed else removed) ["unattended-upgrades"]
+	enable = setup True `before` Service.running "cron"
+	disable = setup False
+
+	setup enabled = (if enabled then installed else removed) ["unattended-upgrades"]
 		`onChange` reConfigure "unattended-upgrades"
 			[("unattended-upgrades/enable_auto_updates" , "boolean", v)]
 		`describe` ("unattended upgrades " ++ v)
@@ -167,7 +180,14 @@
 	setselections = Property "preseed" $ makeChange $
 		withHandle StdinHandle createProcessSuccess
 			(proc "debconf-set-selections" []) $ \h -> do
-				forM_ vals $ \(template, tmpltype, value) ->
-					hPutStrLn h $ unwords [package, template, tmpltype, value]
+				forM_ vals $ \(tmpl, tmpltype, value) ->
+					hPutStrLn h $ unwords [package, tmpl, tmpltype, value]
 				hClose h
 	reconfigure = cmdProperty "dpkg-reconfigure" ["-fnone", package]
+
+-- | Ensures that a service is installed and running.
+--
+-- Assumes that there is a 1:1 mapping between service names and apt
+-- package names.
+serviceInstalledRunning :: Package -> Property
+serviceInstalledRunning svc = Service.running svc `requires` installed [svc]
diff --git a/Propellor/Property/Cmd.hs b/Propellor/Property/Cmd.hs
--- a/Propellor/Property/Cmd.hs
+++ b/Propellor/Property/Cmd.hs
@@ -1,17 +1,17 @@
+{-# LANGUAGE PackageImports #-}
+
 module Propellor.Property.Cmd (
 	cmdProperty,
 	cmdProperty',
 	scriptProperty,
 	userScriptProperty,
-	serviceRunning,
 ) where
 
-import Control.Monad
 import Control.Applicative
 import Data.List
+import "mtl" Control.Monad.Reader
 
 import Propellor.Types
-import Propellor.Engine
 import Utility.Monad
 import Utility.SafeCommand
 import Utility.Env
@@ -25,7 +25,7 @@
 -- | A property that can be satisfied by running a command,
 -- with added environment.
 cmdProperty' :: String -> [String] -> [(String, String)] -> Property
-cmdProperty' cmd params env = Property desc $ do
+cmdProperty' cmd params env = Property desc $ liftIO $ do
 	env' <- addEntries env <$> getEnvironment
 	ifM (boolSystemEnv cmd (map Param params) (Just env'))
 		( return MadeChange
@@ -46,14 +46,3 @@
 userScriptProperty user script = cmdProperty "su" ["-c", shellcmd, user]
   where
 	shellcmd = intercalate " ; " ("set -e" : "cd" : script)
-
--- | Ensures that a service is running.
---
--- Note that due to the general poor state of init scripts, the best
--- we can do is try to start the service, and if it fails, assume
--- this means it's already running.
-serviceRunning :: String -> Property
-serviceRunning svc = Property ("running " ++ svc) $ do
-	void $ ensureProperty $
-		scriptProperty ["service " ++ shellEscape svc ++ " start >/dev/null 2>&1 || true"]
-	return NoChange
diff --git a/Propellor/Property/Cron.hs b/Propellor/Property/Cron.hs
--- a/Propellor/Property/Cron.hs
+++ b/Propellor/Property/Cron.hs
@@ -18,8 +18,7 @@
 	, ""
 	, times ++ "\t" ++ user ++ "\t" ++ "cd " ++ cddir ++ " && " ++ command
 	]
-	`requires` Apt.installed ["cron"]
-	`requires` serviceRunning "cron"
+	`requires` Apt.serviceInstalledRunning "cron"
 	`describe` ("cronned " ++ desc)
 
 -- | Installs a cron job, and runs it niced and ioniced.
diff --git a/Propellor/Property/Dns.hs b/Propellor/Property/Dns.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Property/Dns.hs
@@ -0,0 +1,63 @@
+module Propellor.Property.Dns where
+
+import Propellor
+import Propellor.Property.File
+import qualified Propellor.Property.Apt as Apt
+import qualified Propellor.Property.Service as Service
+
+namedconf :: FilePath
+namedconf = "/etc/bind/named.conf.local"
+
+data Zone = Zone
+	{ zdomain :: Domain
+	, ztype :: Type
+	, zfile :: FilePath
+	, zmasters :: [IPAddr]
+	, zconfiglines :: [String]
+	}
+
+zoneDesc :: Zone -> String
+zoneDesc z = zdomain z ++ " (" ++ show (ztype z) ++ ")"
+
+type IPAddr = String
+
+type Domain = String
+
+data Type = Master | Secondary
+	deriving (Show, Eq)
+
+secondary :: Domain -> [IPAddr] -> Zone
+secondary domain masters = Zone
+	{ zdomain = domain
+	, ztype = Secondary
+	, zfile = "db." ++ domain
+	, zmasters = masters
+	, zconfiglines = ["allow-transfer { }"]
+	}
+
+zoneStanza :: Zone -> [Line]
+zoneStanza z =
+	[ "// automatically generated by propellor"
+	, "zone \"" ++ zdomain z ++ "\" {"
+	, cfgline "type" (if ztype z == Master then "master" else "slave")
+	, cfgline "file" ("\"" ++ zfile z ++ "\"")
+	] ++
+	(if null (zmasters z) then [] else mastersblock) ++
+	(map (\l -> "\t" ++ l ++ ";") (zconfiglines z)) ++
+	[ "};"
+	, ""
+	]
+  where
+	cfgline f v = "\t" ++ f ++ " " ++ v ++ ";"
+	mastersblock =
+		[ "\tmasters {" ] ++
+		(map (\ip -> "\t\t" ++ ip ++ ";") (zmasters z)) ++
+		[ "\t};" ]
+
+-- | Rewrites the whole named.conf.local file to serve the specificed
+-- zones.
+zones :: [Zone] -> Property
+zones zs = hasContent namedconf (concatMap zoneStanza zs)
+	`describe` ("dns server for zones: " ++ unwords (map zoneDesc zs))
+	`requires` Apt.serviceInstalledRunning "bind9"
+	`onChange` Service.reloaded "bind9"
diff --git a/Propellor/Property/Docker.hs b/Propellor/Property/Docker.hs
--- a/Propellor/Property/Docker.hs
+++ b/Propellor/Property/Docker.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE RankNTypes, BangPatterns #-}
+{-# LANGUAGE BangPatterns #-}
 
 -- | Docker support for propellor
 --
@@ -9,6 +9,7 @@
 
 import Propellor
 import Propellor.SimpleSh
+import Propellor.Types.Attr
 import qualified Propellor.Property.File as File
 import qualified Propellor.Property.Apt as Apt
 import qualified Propellor.Property.Docker.Shim as Shim
@@ -32,6 +33,25 @@
 installed :: Property
 installed = Apt.installed ["docker.io"]
 
+-- | A short descriptive name for a container.
+-- Should not contain whitespace or other unusual characters,
+-- only [a-zA-Z0-9_-] are allowed
+type ContainerName = String
+
+-- | Starts accumulating the properties of a Docker container.
+--
+-- > container "web-server" "debian"
+-- >    & publish "80:80"
+-- >    & Apt.installed {"apache2"]
+-- >    & ...
+container :: ContainerName -> Image -> Host
+container cn image = Host [] (\_ -> attr)
+  where
+	attr = (newAttr (cn2hn cn)) { _dockerImage = Just image }
+
+cn2hn :: ContainerName -> HostName
+cn2hn cn = cn ++ ".docker"
+
 -- | Ensures that a docker container is set up and running. The container
 -- has its own Properties which are handled by running propellor
 -- inside the container.
@@ -39,44 +59,61 @@
 -- Reverting this property ensures that the container is stopped and
 -- removed.
 docked
-	:: (HostName -> ContainerName -> Maybe (Container))
-	-> HostName
+	:: [Host]
 	-> ContainerName
 	-> RevertableProperty
-docked findc hn cn = findContainer findc hn cn $
-	\(Container image containerprops) ->
-		let setup = provisionContainer cid
-				`requires`
-			runningContainer cid image containerprops
-				`requires`
-			installed
-		    teardown = combineProperties ("undocked " ++ fromContainerId cid)
-		    	[ stoppedContainer cid
+docked hosts cn = RevertableProperty (go "docked" setup) (go "undocked" teardown)
+  where
+	go desc a = Property (desc ++ " " ++ cn) $ do
+		hn <- getHostName
+  		let cid = ContainerId hn cn
+		ensureProperties [findContainer hosts cid cn $ a cid]
+
+	setup cid (Container image runparams) =
+		provisionContainer cid
+			`requires`
+		runningContainer cid image runparams
+			`requires`
+		installed
+
+	teardown cid (Container image _runparams) =
+		combineProperties ("undocked " ++ fromContainerId cid)
+			[ stoppedContainer cid
 			, Property ("cleaned up " ++ fromContainerId cid) $
-				report <$> mapM id
+				liftIO $ report <$> mapM id
 					[ removeContainer cid
 					, removeImage image
 					]
 			]
-		in RevertableProperty setup teardown
-  where
-  	cid = ContainerId hn cn
 
 findContainer
-	:: (HostName -> ContainerName -> Maybe (Container))
-	-> HostName
+	:: [Host]
+	-> ContainerId
 	-> ContainerName
-	-> (Container -> RevertableProperty)
-	-> RevertableProperty
-findContainer findc hn cn mk = case findc hn cn of
-	Nothing -> RevertableProperty cantfind cantfind
-	Just container -> mk container
+	-> (Container -> Property)
+	-> Property
+findContainer hosts cid cn mk = case findHost hosts (cn2hn cn) of
+	Nothing -> cantfind
+	Just h -> maybe cantfind mk (mkContainer cid h)
   where
-  	cid = ContainerId hn cn
-	cantfind = containerDesc (ContainerId hn cn) $ Property "" $ do
-		warningMessage $ "missing definition for docker container \"" ++ fromContainerId cid
+	cantfind = containerDesc cid $ Property "" $ do
+		liftIO $ warningMessage $
+			"missing definition for docker container \"" ++ cn2hn cn
 		return FailedChange
 
+mkContainer :: ContainerId -> Host -> Maybe Container
+mkContainer cid@(ContainerId hn _cn) h = Container
+	<$> _dockerImage attr
+	<*> pure (map (\a -> a hn) (_dockerRunParams attr))
+  where
+	attr = hostAttr h'
+  	h' = h
+		-- expose propellor directory inside the container
+		& volume (localdir++":"++localdir)
+		-- name the container in a predictable way so we
+		-- and the user can easily find it later
+		& name (fromContainerId cid)
+
 -- | Causes *any* docker images that are not in use by running containers to
 -- be deleted. And deletes any containers that propellor has set up
 -- before that are not currently running. Does not delete any containers
@@ -90,34 +127,11 @@
 	]
   where
 	gccontainers = Property "docker containers garbage collected" $
-		report <$> (mapM removeContainer =<< listContainers AllContainers)
+		liftIO $ report <$> (mapM removeContainer =<< listContainers AllContainers)
 	gcimages = Property "docker images garbage collected" $ do
-		report <$> (mapM removeImage =<< listImages)
-
--- | Pass to defaultMain to add docker containers.
--- You need to provide the function mapping from
--- HostName and ContainerName to the Container to use.
-containerProperties
-	:: (HostName -> ContainerName -> Maybe (Container))
-	-> (HostName -> Maybe [Property])
-containerProperties findcontainer = \h -> case toContainerId h of
-	Nothing -> Nothing
-	Just cid@(ContainerId hn cn) ->
-		case findcontainer hn cn of
-			Nothing -> Nothing
-			Just (Container _ cprops) -> 
-				Just $ map (containerDesc cid) $
-					fromContainerized cprops
-
--- | This type is used to configure a docker container.
--- It has an image, and a list of Properties, but these
--- properties are Containerized; they can specify
--- things about the container's configuration, in
--- addition to properties of the system inside the
--- container.
-data Container = Container Image [Containerized Property]
+		liftIO $ report <$> (mapM removeImage =<< listImages)
 
-data Containerized a = Containerized [HostName -> RunParam] a
+data Container = Container Image [RunParam]
 
 -- | Parameters to pass to `docker run` when creating a container.
 type RunParam = String
@@ -125,62 +139,50 @@
 -- | A docker image, that can be used to run a container.
 type Image = String
 
--- | A short descriptive name for a container.
--- Should not contain whitespace or other unusual characters,
--- only [a-zA-Z0-9_.-] are allowed
-type ContainerName = String
-
--- | Lift a Property to apply inside a container.
-inside1 :: Property -> Containerized Property
-inside1 = Containerized []
-
-inside :: [Property] -> Containerized Property
-inside = Containerized [] . combineProperties "provision"
-
 -- | Set custom dns server for container.
-dns :: String -> Containerized Property
+dns :: String -> AttrProperty
 dns = runProp "dns"
 
 -- | Set container host name.
-hostname :: String -> Containerized Property
+hostname :: String -> AttrProperty
 hostname = runProp "hostname"
 
 -- | Set name for container. (Normally done automatically.)
-name :: String -> Containerized Property
+name :: String -> AttrProperty
 name = runProp "name"
 
 -- | Publish a container's port to the host
 -- (format: ip:hostPort:containerPort | ip::containerPort | hostPort:containerPort)
-publish :: String -> Containerized Property
+publish :: String -> AttrProperty
 publish = runProp "publish"
 
 -- | Username or UID for container.
-user :: String -> Containerized Property
+user :: String -> AttrProperty
 user = runProp "user"
 
 -- | Mount a volume
 -- Create a bind mount with: [host-dir]:[container-dir]:[rw|ro]
 -- With just a directory, creates a volume in the container.
-volume :: String -> Containerized Property
+volume :: String -> AttrProperty
 volume = runProp "volume"
 
 -- | Mount a volume from the specified container into the current
 -- container.
-volumes_from :: ContainerName -> Containerized Property
+volumes_from :: ContainerName -> AttrProperty
 volumes_from cn = genProp "volumes-from" $ \hn ->
 	fromContainerId (ContainerId hn cn)
 
 -- | Work dir inside the container. 
-workdir :: String -> Containerized Property
+workdir :: String -> AttrProperty
 workdir = runProp "workdir"
 
 -- | Memory limit for container.
 --Format: <number><optional unit>, where unit = b, k, m or g
-memory :: String -> Containerized Property
+memory :: String -> AttrProperty
 memory = runProp "memory"
 
 -- | Link with another container on the same host.
-link :: ContainerName -> ContainerAlias -> Containerized Property
+link :: ContainerName -> ContainerAlias -> AttrProperty
 link linkwith alias = genProp "link" $ \hn ->
 	fromContainerId (ContainerId hn linkwith) ++ ":" ++ alias
 
@@ -199,16 +201,6 @@
 data ContainerIdent = ContainerIdent Image HostName ContainerName [RunParam]
 	deriving (Read, Show, Eq)
 
-getRunParams :: HostName -> [Containerized a] -> [RunParam]
-getRunParams hn l = concatMap get l
-  where
-	get (Containerized ps _) = map (\a -> a hn ) ps
-
-fromContainerized :: forall a. [Containerized a] -> [a]
-fromContainerized l = map get l
-  where
-	get (Containerized _ a) = a
-
 ident2id :: ContainerIdent -> ContainerId
 ident2id (ContainerIdent _ hn cn _) = ContainerId hn cn
 
@@ -226,32 +218,32 @@
 fromContainerId :: ContainerId -> String
 fromContainerId (ContainerId hn cn) = cn++"."++hn++myContainerSuffix
 
+containerHostName :: ContainerId -> HostName
+containerHostName (ContainerId _ cn) = cn2hn cn
+
 myContainerSuffix :: String
 myContainerSuffix = ".propellor"
 
-containerFrom :: Image -> [Containerized Property] -> Container
-containerFrom = Container
-
 containerDesc :: ContainerId -> Property -> Property
 containerDesc cid p = p `describe` desc
   where
 	desc = "[" ++ fromContainerId cid ++ "] " ++ propertyDesc p
 
-runningContainer :: ContainerId -> Image -> [Containerized Property] -> Property
-runningContainer cid@(ContainerId hn cn) image containerprops = containerDesc cid $ Property "running" $ do
-	l <- listContainers RunningContainers
+runningContainer :: ContainerId -> Image -> [RunParam] -> Property
+runningContainer cid@(ContainerId hn cn) image runps = containerDesc cid $ Property "running" $ do
+	l <- liftIO $ listContainers RunningContainers
 	if cid `elem` l
 		then do
 			-- Check if the ident has changed; if so the
 			-- parameters of the container differ and it must
 			-- be restarted.
-			runningident <- getrunningident
+			runningident <- liftIO $ getrunningident
 			if runningident == Just ident
-				then return NoChange
+				then noChange
 				else do
-					void $ stopContainer cid
+					void $ liftIO $ stopContainer cid
 					restartcontainer
-		else ifM (elem cid <$> listContainers AllContainers)
+		else ifM (liftIO $ elem cid <$> listContainers AllContainers)
 			( restartcontainer
 			, go image
 			)
@@ -259,8 +251,8 @@
 	ident = ContainerIdent image hn cn runps
 
 	restartcontainer = do
-		oldimage <- fromMaybe image <$> commitContainer cid
-		void $ removeContainer cid
+		oldimage <- liftIO $ fromMaybe image <$> commitContainer cid
+		void $ liftIO $ removeContainer cid
 		go oldimage
 
 	getrunningident :: IO (Maybe ContainerIdent)
@@ -271,19 +263,12 @@
 	extractident :: [Resp] -> Maybe ContainerIdent
 	extractident = headMaybe . catMaybes . map readish . catMaybes . map getStdout
 
-	runps = getRunParams hn $ containerprops ++
-		-- expose propellor directory inside the container
-		[ volume (localdir++":"++localdir)
-		-- name the container in a predictable way so we
-		-- and the user can easily find it later
-		, name (fromContainerId cid)
-		]
-	
 	go img = do
-		clearProvisionedFlag cid
-		createDirectoryIfMissing True (takeDirectory $ identFile cid)
-		shim <- Shim.setup (localdir </> "propellor") (localdir </> shimdir cid)
-		writeFile (identFile cid) (show ident)
+		liftIO $ do
+			clearProvisionedFlag cid
+			createDirectoryIfMissing True (takeDirectory $ identFile cid)
+		shim <- liftIO $ Shim.setup (localdir </> "propellor") (localdir </> shimdir cid)
+		liftIO $ writeFile (identFile cid) (show ident)
 		ensureProperty $ boolProperty "run" $ runContainer img
 			(runps ++ ["-i", "-d", "-t"])
 			[shim, "--docker", fromContainerId cid]
@@ -317,7 +302,7 @@
 		-- to avoid ever provisioning twice at the same time.
 		whenM (checkProvisionedFlag cid) $ do
 			let shim = Shim.file (localdir </> "propellor") (localdir </> shimdir cid)
-			unlessM (boolSystem shim [Param "--continue", Param $ show $ Chain $ fromContainerId cid]) $
+			unlessM (boolSystem shim [Param "--continue", Param $ show $ Chain $ containerHostName cid]) $
 				warningMessage "Boot provision failed!"
 		void $ async $ job reapzombies
 		void $ async $ job $ simpleSh $ namedPipe cid
@@ -339,14 +324,14 @@
 -- being run. So, retry connections to the client for up to
 -- 1 minute.
 provisionContainer :: ContainerId -> Property
-provisionContainer cid = containerDesc cid $ Property "provision" $ do
+provisionContainer cid = containerDesc cid $ Property "provision" $ liftIO $ do
 	let shim = Shim.file (localdir </> "propellor") (localdir </> shimdir cid)
 	r <- simpleShClientRetry 60 (namedPipe cid) shim params (go Nothing)
 	when (r /= FailedChange) $
 		setProvisionedFlag cid 
 	return r
   where
-	params = ["--continue", show $ Chain $ fromContainerId cid]
+	params = ["--continue", show $ Chain $ containerHostName cid]
 
 	go lastline (v:rest) = case v of
 		StdoutLine s -> do
@@ -372,8 +357,8 @@
 
 stoppedContainer :: ContainerId -> Property
 stoppedContainer cid = containerDesc cid $ Property desc $ 
-	ifM (elem cid <$> listContainers RunningContainers)
-		( cleanup `after` ensureProperty 
+	ifM (liftIO $ elem cid <$> listContainers RunningContainers)
+		( liftIO cleanup `after` ensureProperty 
 			(boolProperty desc $ stopContainer cid)
 		, return NoChange
 		)
@@ -420,17 +405,18 @@
 listImages :: IO [Image]
 listImages = lines <$> readProcess dockercmd ["images", "--all", "--quiet"]
 
-runProp :: String -> RunParam -> Containerized Property
-runProp field val = Containerized
-	[\_ -> "--" ++ param]
-	(Property (param) (return NoChange))
+runProp :: String -> RunParam -> AttrProperty
+runProp field val = AttrProperty prop $ \attr ->
+	attr { _dockerRunParams = _dockerRunParams attr ++ [\_ -> "--"++param] }
   where
 	param = field++"="++val
+	prop = Property (param) (return NoChange)
 
-genProp :: String -> (HostName -> RunParam) -> Containerized Property
-genProp field mkval = Containerized
-	[\h -> "--" ++ field ++ "=" ++ mkval h]
-	(Property field (return NoChange))
+genProp :: String -> (HostName -> RunParam) -> AttrProperty
+genProp field mkval = AttrProperty prop $ \attr ->
+	attr { _dockerRunParams = _dockerRunParams attr ++ [\hn -> "--"++field++"=" ++ mkval hn] }
+  where
+	prop = Property field (return NoChange)
 
 -- | The ContainerIdent of a container is written to
 -- /.propellor-ident inside it. This can be checked to see if
diff --git a/Propellor/Property/File.hs b/Propellor/Property/File.hs
--- a/Propellor/Property/File.hs
+++ b/Propellor/Property/File.hs
@@ -11,6 +11,13 @@
 f `hasContent` newcontent = fileProperty ("replace " ++ f)
 	(\_oldcontent -> newcontent) f
 
+-- | Ensures a file has contents that comes from PrivData.
+-- Note: Does not do anything with the permissions of the file to prevent
+-- it from being seen.
+hasPrivContent :: FilePath -> Property
+hasPrivContent f = Property ("privcontent " ++ f) $
+	withPrivData (PrivFile f) (\v -> ensureProperty $ f `hasContent` lines v)
+
 -- | Ensures that a line is present in a file, adding it to the end if not.
 containsLine :: FilePath -> Line -> Property
 f `containsLine` l = fileProperty (f ++ " contains:" ++ l) go f
@@ -31,10 +38,10 @@
 	makeChange $ nukeFile f
 
 fileProperty :: Desc -> ([Line] -> [Line]) -> FilePath -> Property
-fileProperty desc a f = Property desc $ go =<< doesFileExist f
+fileProperty desc a f = Property desc $ go =<< liftIO (doesFileExist f)
   where
 	go True = do
-		ls <- lines <$> readFile f
+		ls <- liftIO $ lines <$> readFile f
 		let ls' = a ls
 		if ls' == ls
 			then noChange
@@ -51,3 +58,13 @@
 dirExists :: FilePath -> Property
 dirExists d = check (not <$> doesDirectoryExist d) $ Property (d ++ " exists") $
 	makeChange $ createDirectoryIfMissing True d
+
+-- | Ensures that a file/dir has the specified owner and group.
+ownerGroup :: FilePath -> UserName -> GroupName -> Property
+ownerGroup f owner group = Property (f ++ " owner " ++ og) $ do
+	r <- ensureProperty $ cmdProperty "chown" [og, f]
+	if r == FailedChange
+		then return r
+		else noChange
+  where
+	og = owner ++ ":" ++ group
diff --git a/Propellor/Property/Git.hs b/Propellor/Property/Git.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Property/Git.hs
@@ -0,0 +1,48 @@
+module Propellor.Property.Git where
+
+import Propellor
+import Propellor.Property.File
+import qualified Propellor.Property.Apt as Apt
+import qualified Propellor.Property.Service as Service
+
+import Data.List
+
+-- | Exports all git repos in a directory (that user nobody can read)
+-- using git-daemon, run from inetd.
+--
+-- Note that reverting this property does not remove or stop inetd.
+daemonRunning :: FilePath -> RevertableProperty
+daemonRunning exportdir = RevertableProperty setup unsetup
+  where
+	setup = containsLine conf (mkl "tcp4")
+		`requires`
+		containsLine conf (mkl "tcp6")
+		`requires`
+		dirExists exportdir
+		`requires`
+		Apt.serviceInstalledRunning "openbsd-inetd"
+		`onChange`
+		Service.running "openbsd-inetd"
+		`describe` ("git-daemon exporting " ++ exportdir)
+	unsetup = lacksLine conf (mkl "tcp4")
+		`requires`
+		lacksLine conf (mkl "tcp6")
+		`onChange`
+		Service.reloaded "openbsd-inetd"
+
+	conf = "/etc/inetd.conf"
+
+	mkl tcpv = intercalate "\t"
+		[ "git"
+		, "stream"
+		, tcpv
+		, "nowait"
+		, "nobody"
+		, "/usr/bin/git"
+		, "git"
+		, "daemon"
+		, "--inetd"
+		, "--export-all"
+		, "--base-path=" ++ exportdir
+		, exportdir
+		]
diff --git a/Propellor/Property/Hostname.hs b/Propellor/Property/Hostname.hs
--- a/Propellor/Property/Hostname.hs
+++ b/Propellor/Property/Hostname.hs
@@ -3,21 +3,24 @@
 import Propellor
 import qualified Propellor.Property.File as File
 
--- | Sets the hostname. Configures both /etc/hostname and the current
--- hostname.
+-- | Ensures that the hostname is set to the HostAttr value.
+-- Configures both /etc/hostname and the current hostname.
 --
--- When provided with a FQDN, also configures /etc/hosts,
+-- When the hostname is a FQDN, also configures /etc/hosts,
 -- with an entry for 127.0.1.1, which is standard at least on Debian
 -- to set the FDQN (127.0.0.1 is localhost).
-set :: HostName -> Property
-set hostname = combineProperties desc go
-	`onChange` cmdProperty "hostname" [host]
+sane :: Property
+sane = Property ("sane hostname") (ensureProperty . setTo =<< getHostName)
+
+setTo :: HostName -> Property
+setTo hn = combineProperties desc go
+	`onChange` cmdProperty "hostname" [basehost]
   where
-	desc = "hostname " ++ hostname
-	(host, domain) = separate (== '.') hostname
+	desc = "hostname " ++ hn
+	(basehost, domain) = separate (== '.') hn
 
 	go = catMaybes
-		[ Just $ "/etc/hostname" `File.hasContent` [host]
+		[ Just $ "/etc/hostname" `File.hasContent` [basehost]
 		, if null domain
 			then Nothing 
 			else Just $ File.fileProperty desc
@@ -25,7 +28,7 @@
 		]
 	
 	hostip = "127.0.1.1"
-	hostline = hostip ++ "\t" ++ hostname ++ " " ++ host
+	hostline = hostip ++ "\t" ++ hn ++ " " ++ basehost
 
 	addhostline ls = hostline : filter (not . hashostip) ls
 	hashostip l = headMaybe (words l) == Just hostip
diff --git a/Propellor/Property/Network.hs b/Propellor/Property/Network.hs
--- a/Propellor/Property/Network.hs
+++ b/Propellor/Property/Network.hs
@@ -20,6 +20,7 @@
 		, "\taddress 2002:5044:5531::1"
 		, "\tnetmask 64"
 		, "\tgateway ::192.88.99.1"
+		, "auto sit0"
 		, "# End automatically added by propeller"
 		]
 
diff --git a/Propellor/Property/OpenId.hs b/Propellor/Property/OpenId.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Property/OpenId.hs
@@ -0,0 +1,26 @@
+module Propellor.Property.OpenId 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 Data.List
+
+providerFor :: [UserName] -> String -> Property
+providerFor users baseurl = propertyList desc $
+	[ Apt.serviceInstalledRunning "apache2"
+	, Apt.installed ["simpleid"]
+		`onChange` Service.restarted "apache2"
+	, File.fileProperty desc
+		(map setbaseurl) "/etc/simpleid/config.inc"
+	] ++ map identfile users
+  where
+	identfile u = File.hasPrivContent $ concat
+		[ "/var/lib/simpleid/identities/", u, ".identity" ]
+	url = "http://"++baseurl++"/simpleid"
+	desc = "openid provider " ++ url
+	setbaseurl l
+		| "SIMPLEID_BASE_URL" `isInfixOf` l = 
+			"define('SIMPLEID_BASE_URL', '"++url++"');"
+		| otherwise = l
diff --git a/Propellor/Property/Scheduled.hs b/Propellor/Property/Scheduled.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Property/Scheduled.hs
@@ -0,0 +1,67 @@
+module Propellor.Property.Scheduled
+	( period
+	, periodParse
+	, Recurrance(..)
+	, WeekDay
+	, MonthDay
+	, YearDay
+	) where
+
+import Propellor
+import Utility.Scheduled
+
+import Data.Time.Clock
+import Data.Time.LocalTime
+import qualified Data.Map as M
+
+-- | Makes a Property only be checked every so often.
+--
+-- This uses the description of the Property to keep track of when it was
+-- last run.
+period :: Property -> Recurrance -> Property
+period prop recurrance = Property desc $ do
+	lasttime <- liftIO $ getLastChecked (propertyDesc prop)
+	nexttime <- liftIO $ fmap startTime <$> nextTime schedule lasttime
+	t <- liftIO localNow
+	if Just t >= nexttime
+		then do
+			r <- ensureProperty prop
+			liftIO $ setLastChecked t (propertyDesc prop)
+			return r
+		else noChange
+  where
+	schedule = Schedule recurrance AnyTime
+	desc = propertyDesc prop ++ " (period " ++ fromRecurrance recurrance ++ ")"
+
+-- | Like period, but parse a human-friendly string.
+periodParse :: Property -> String -> Property
+periodParse prop s = case toRecurrance s of
+	Just recurrance -> period prop recurrance
+	Nothing -> Property "periodParse" $ do
+		liftIO $ warningMessage $ "failed periodParse: " ++ s
+		noChange
+
+lastCheckedFile :: FilePath
+lastCheckedFile = localdir </> ".lastchecked"
+
+getLastChecked :: Desc -> IO (Maybe LocalTime)
+getLastChecked desc = M.lookup desc <$> readLastChecked
+
+localNow :: IO LocalTime
+localNow = do
+	now <- getCurrentTime
+	tz <- getTimeZone now
+	return $ utcToLocalTime tz now
+
+setLastChecked :: LocalTime -> Desc -> IO ()
+setLastChecked time desc = do
+	m <- readLastChecked
+	writeLastChecked (M.insert desc time m)
+
+readLastChecked :: IO (M.Map Desc LocalTime)
+readLastChecked = fromMaybe M.empty <$> catchDefaultIO Nothing go
+  where
+	go = readish <$> readFile lastCheckedFile
+
+writeLastChecked :: M.Map Desc LocalTime -> IO ()
+writeLastChecked = writeFile lastCheckedFile . show
diff --git a/Propellor/Property/Service.hs b/Propellor/Property/Service.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Property/Service.hs
@@ -0,0 +1,31 @@
+module Propellor.Property.Service where
+
+import Propellor
+import Utility.SafeCommand
+
+type ServiceName = String
+
+-- | Ensures that a service is running. Does not ensure that
+-- any package providing that service is installed. See
+-- Apt.serviceInstalledRunning
+--
+-- Note that due to the general poor state of init scripts, the best
+-- we can do is try to start the service, and if it fails, assume
+-- this means it's already running.
+running :: ServiceName -> Property
+running svc = Property ("running " ++ svc) $ do
+	void $ ensureProperty $
+		scriptProperty ["service " ++ shellEscape svc ++ " start >/dev/null 2>&1 || true"]
+	return NoChange
+
+restarted :: ServiceName -> Property
+restarted svc = Property ("restarted " ++ svc) $ do
+	void $ ensureProperty $
+		scriptProperty ["service " ++ shellEscape svc ++ " restart >/dev/null 2>&1 || true"]
+	return NoChange
+
+reloaded :: ServiceName -> Property
+reloaded svc = Property ("reloaded " ++ svc) $ do
+	void $ ensureProperty $
+		scriptProperty ["service " ++ shellEscape svc ++ " reload >/dev/null 2>&1 || true"]
+	return NoChange
diff --git a/Propellor/Property/SiteSpecific/GitAnnexBuilder.hs b/Propellor/Property/SiteSpecific/GitAnnexBuilder.hs
--- a/Propellor/Property/SiteSpecific/GitAnnexBuilder.hs
+++ b/Propellor/Property/SiteSpecific/GitAnnexBuilder.hs
@@ -24,7 +24,7 @@
 	, Apt.buildDep ["git-annex"]
 	, Apt.installed ["git", "rsync", "moreutils", "ca-certificates",
 		"liblockfile-simple-perl", "cabal-install", "vim", "less"]
-	, serviceRunning "cron" `requires` Apt.installed ["cron"]
+	, Apt.serviceInstalledRunning "cron"
 	, User.accountFor builduser
 	, check (not <$> doesDirectoryExist gitbuilderdir) $ userScriptProperty builduser
 		[ "git clone git://git.kitenet.net/gitannexbuilder " ++ gitbuilderdir
@@ -44,12 +44,13 @@
 		let f = homedir </> "rsyncpassword"
 		if rsyncupload 
 			then withPrivData (Password builduser) $ \p -> do
-				oldp <- catchDefaultIO "" $ readFileStrict f
+				oldp <- liftIO $ catchDefaultIO "" $
+					readFileStrict f
 				if p /= oldp
 					then makeChange $ writeFile f p
 					else noChange
 			else do
-				ifM (doesFileExist f)
+				ifM (liftIO $ doesFileExist f)
 					( noChange
 					, makeChange $ writeFile f "no password configured"
 					)
diff --git a/Propellor/Property/SiteSpecific/GitHome.hs b/Propellor/Property/SiteSpecific/GitHome.hs
--- a/Propellor/Property/SiteSpecific/GitHome.hs
+++ b/Propellor/Property/SiteSpecific/GitHome.hs
@@ -8,8 +8,8 @@
 -- | Clones Joey Hess's git home directory, and runs its fixups script.
 installedFor :: UserName -> Property
 installedFor user = check (not <$> hasGitDir user) $ 
-	Property ("githome " ++ user) (go =<< homedir user)
-		`requires` Apt.installed ["git", "myrepos"]
+	Property ("githome " ++ user) (go =<< liftIO (homedir user))
+		`requires` Apt.installed ["git"]
   where
  	go Nothing = noChange
 	go (Just home) = do
@@ -20,7 +20,7 @@
 				moveout tmpdir home
 			, Property "rmdir" $ makeChange $ void $
 				catchMaybeIO $ removeDirectory tmpdir
-			, userScriptProperty user ["rm -rf .aptitude/ .bashrc .profile; mr checkout; bin/fixups"]
+			, userScriptProperty user ["rm -rf .aptitude/ .bashrc .profile; bin/mr checkout; bin/fixups"]
 			]
 	moveout tmpdir home = do
 		fs <- dirContents tmpdir
diff --git a/Propellor/Property/SiteSpecific/JoeySites.hs b/Propellor/Property/SiteSpecific/JoeySites.hs
--- a/Propellor/Property/SiteSpecific/JoeySites.hs
+++ b/Propellor/Property/SiteSpecific/JoeySites.hs
@@ -6,8 +6,8 @@
 import Propellor
 import qualified Propellor.Property.Apt as Apt
 
-oldUseNetshellBox :: Property
-oldUseNetshellBox = check (not <$> Apt.isInstalled "oldusenet") $
+oldUseNetShellBox :: Property
+oldUseNetShellBox = check (not <$> Apt.isInstalled "oldusenet") $
 	propertyList ("olduse.net shellbox")
 		[ Apt.installed (words "build-essential devscripts debhelper git libncursesw5-dev libpcre3-dev pkg-config bison libicu-dev libidn11-dev libcanlock2-dev libuu-dev ghc libghc-strptime-dev libghc-hamlet-dev libghc-ifelse-dev libghc-hxt-dev libghc-utf8-string-dev libghc-missingh-dev libghc-sha-dev")
 			`describe` "olduse.net build deps"
diff --git a/Propellor/Property/Ssh.hs b/Propellor/Property/Ssh.hs
--- a/Propellor/Property/Ssh.hs
+++ b/Propellor/Property/Ssh.hs
@@ -53,7 +53,7 @@
 	`onChange` restartSshd
   where
 	prop = Property "ssh unique host keys" $ do
-		void $ boolSystem "sh"
+		void $ liftIO $ boolSystem "sh"
 			[ Param "-c"
 			, Param "rm -f /etc/ssh/ssh_host_*"
 			]
diff --git a/Propellor/Property/Sudo.hs b/Propellor/Property/Sudo.hs
--- a/Propellor/Property/Sudo.hs
+++ b/Propellor/Property/Sudo.hs
@@ -13,7 +13,7 @@
 enabledFor user = Property desc go `requires` Apt.installed ["sudo"]
   where
 	go = do
-		locked <- isLockedPassword user
+		locked <- liftIO $ isLockedPassword user
 		ensureProperty $
 			fileProperty desc
 				(modify locked . filter (wanted locked))
diff --git a/Propellor/SimpleSh.hs b/Propellor/SimpleSh.hs
--- a/Propellor/SimpleSh.hs
+++ b/Propellor/SimpleSh.hs
@@ -27,7 +27,7 @@
 	createDirectoryIfMissing True dir
 	modifyFileMode dir (removeModes otherGroupModes)
 	s <- socket AF_UNIX Stream defaultProtocol
-	bind s (SockAddrUnix namedpipe)
+	bindSocket s (SockAddrUnix namedpipe)
 	listen s 2
 	forever $ do
 		(client, _addr) <- accept s
diff --git a/Propellor/Types.hs b/Propellor/Types.hs
--- a/Propellor/Types.hs
+++ b/Propellor/Types.hs
@@ -1,19 +1,74 @@
-module Propellor.Types where
+{-# LANGUAGE PackageImports #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE ExistentialQuantification #-}
 
+module Propellor.Types
+	( Host(..)
+	, Attr
+	, HostName
+	, UserName
+	, GroupName
+	, Propellor(..)
+	, Property(..)
+	, RevertableProperty(..)
+	, AttrProperty(..)
+	, IsProp
+	, describe
+	, toProp
+	, getAttr
+	, requires
+	, Desc
+	, Result(..)
+	, System(..)
+	, Distribution(..)
+	, DebianSuite(..)
+	, Release
+	, Architecture
+	, ActionResult(..)
+	, CmdLine(..)
+	, PrivDataField(..)
+	) where
+
 import Data.Monoid
+import Control.Applicative
 import System.Console.ANSI
+import "mtl" Control.Monad.Reader
+import "MonadCatchIO-transformers" Control.Monad.CatchIO
 
-type HostName = String
+import Propellor.Types.Attr
+
+data Host = Host [Property] (Attr -> Attr)
+
 type UserName = String
+type GroupName = String
 
+-- | Propellor's monad provides read-only access to attributes of the
+-- system.
+newtype Propellor p = Propellor { runWithAttr :: ReaderT Attr IO p }
+	deriving
+		( Monad
+		, Functor
+		, Applicative
+		, MonadReader Attr 
+		, MonadIO
+		, MonadCatchIO
+		)
+
+-- | The core data type of Propellor, this represents a property
+-- that the system should have, and an action to ensure it has the
+-- property.
 data Property = Property
 	{ propertyDesc :: Desc
 	-- | must be idempotent; may run repeatedly
-	, propertySatisfy :: IO Result
+	, propertySatisfy :: Propellor Result
 	}
 
+-- | A property that can be reverted.
 data RevertableProperty = RevertableProperty Property Property
 
+-- | A property that affects the Attr.
+data AttrProperty = forall p. IsProp p => AttrProperty p (Attr -> Attr)
+
 class IsProp p where
 	-- | Sets description.
 	describe :: p -> Desc -> p
@@ -21,6 +76,7 @@
 	-- | Indicates that the first property can only be satisfied
 	-- once the second one is.
 	requires :: p -> Property -> p
+	getAttr :: p -> (Attr -> Attr)
 
 instance IsProp Property where
 	describe p d = p { propertyDesc = d }
@@ -30,6 +86,7 @@
 		case r of
 			FailedChange -> return FailedChange
 			_ -> propertySatisfy x
+	getAttr _ = id
 
 instance IsProp RevertableProperty where
 	-- | Sets the description of both sides.
@@ -38,7 +95,14 @@
 	toProp (RevertableProperty p1 _) = p1
 	(RevertableProperty p1 p2) `requires` y =
 		RevertableProperty (p1 `requires` y) p2
+	getAttr _ = id
 
+instance IsProp AttrProperty where
+	describe (AttrProperty p a) d = AttrProperty (describe p d) a
+	toProp (AttrProperty p _) = toProp p
+	(AttrProperty p a) `requires` y = AttrProperty (p `requires` y) a
+	getAttr (AttrProperty _ a) = a
+
 type Desc = String
 
 data Result = NoChange | MadeChange | FailedChange
@@ -63,7 +127,7 @@
 	deriving (Show)
 
 data DebianSuite = Experimental | Unstable | Testing | Stable | DebianRelease Release
-	deriving (Show)
+	deriving (Show, Eq)
 
 type Release = String
 
@@ -100,6 +164,7 @@
 	= DockerAuthentication
 	| SshPrivKey UserName
 	| Password UserName
+	| PrivFile FilePath
 	deriving (Read, Show, Ord, Eq)
 
 
diff --git a/Propellor/Types/Attr.hs b/Propellor/Types/Attr.hs
new file mode 100644
--- /dev/null
+++ b/Propellor/Types/Attr.hs
@@ -0,0 +1,36 @@
+module Propellor.Types.Attr where
+
+import qualified Data.Set as S
+
+-- | The attributes of a host. For example, its hostname.
+data Attr = Attr
+	{ _hostname :: HostName
+	, _cnames :: S.Set Domain
+
+	, _dockerImage :: Maybe String
+	, _dockerRunParams :: [HostName -> String]
+	}
+
+instance Eq Attr where
+	x == y = and
+		[ _hostname x == _hostname y
+		, _cnames x == _cnames y
+
+		, _dockerImage x == _dockerImage y
+		, let simpl v = map (\a -> a "") (_dockerRunParams v)
+		  in simpl x == simpl y
+		]
+
+instance Show Attr where
+	show a = unlines
+		[ "hostname " ++ _hostname a
+		, "cnames " ++ show (_cnames a)
+		, "docker image " ++ show (_dockerImage a)
+		, "docker run params " ++ show (map (\mk -> mk "") (_dockerRunParams a))
+		]
+
+newAttr :: HostName -> Attr
+newAttr hn = Attr hn S.empty Nothing []
+
+type HostName = String
+type Domain = String
diff --git a/TODO b/TODO
--- a/TODO
+++ b/TODO
@@ -2,15 +2,19 @@
   run it once for the whole. For example, may want to restart apache,
   but only once despite many config changes being made to satisfy
   properties. onChange is a poor substitute.
-* --spin needs 4 ssh connections when bootstrapping a new host
-  that does not have the git repo yet. Should be possible to get that
-  down to 1.
 * Currently only Debian and derivatives are supported by most Properties.
-  One way to improve that would be to parameterize Properties with a
-  Distribution witness.
+  This could be improved by making the Distribution of the system part
+  of its HostAttr.
 * Display of docker container properties is a bit wonky. It always
   says they are unchanged even when they changed and triggered a
   reprovision.
 * Should properties be a tree rather than a list?
-* Only make docker garbage collection run once a day or something
-  to avoid GC after a temp fail.
+* Need a way for a dns server host to look at the properties of 
+  the other hosts and generate a zone file. For example, mapping
+  openid.kitenet.net to a CNAME to clam.kitenet.net, which is where
+  the docker container for that service is located. Moving containers
+  to a different host, or duplicating a container on multiple hosts
+  would then update DNS too
+* There is no way for a property of a docker container to require
+  some property be met outside the container. For example, some servers
+  need ntp installed for a good date source.
diff --git a/Utility/QuickCheck.hs b/Utility/QuickCheck.hs
new file mode 100644
--- /dev/null
+++ b/Utility/QuickCheck.hs
@@ -0,0 +1,52 @@
+{- QuickCheck with additional instances
+ -
+ - Copyright 2012-2014 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{-# LANGUAGE TypeSynonymInstances #-}
+
+module Utility.QuickCheck
+	( module X
+	, module Utility.QuickCheck
+	) where
+
+import Test.QuickCheck as X
+import Data.Time.Clock.POSIX
+import System.Posix.Types
+import qualified Data.Map as M
+import qualified Data.Set as S
+import Control.Applicative
+
+instance (Arbitrary k, Arbitrary v, Eq k, Ord k) => Arbitrary (M.Map k v) where
+	arbitrary = M.fromList <$> arbitrary
+
+instance (Arbitrary v, Eq v, Ord v) => Arbitrary (S.Set v) where
+	arbitrary = S.fromList <$> arbitrary
+
+{- Times before the epoch are excluded. -}
+instance Arbitrary POSIXTime where
+	arbitrary = fromInteger <$> nonNegative arbitrarySizedIntegral
+
+instance Arbitrary EpochTime where
+	arbitrary = fromInteger <$> nonNegative arbitrarySizedIntegral
+
+{- Pids are never negative, or 0. -}
+instance Arbitrary ProcessID where
+	arbitrary = arbitrarySizedBoundedIntegral `suchThat` (> 0)
+
+{- Inodes are never negative. -}
+instance Arbitrary FileID where
+	arbitrary = nonNegative arbitrarySizedIntegral
+
+{- File sizes are never negative. -}
+instance Arbitrary FileOffset where
+	arbitrary = nonNegative arbitrarySizedIntegral
+
+nonNegative :: (Num a, Ord a) => Gen a -> Gen a
+nonNegative g = g `suchThat` (>= 0)
+
+positive :: (Num a, Ord a) => Gen a -> Gen a
+positive g = g `suchThat` (> 0)
diff --git a/Utility/Scheduled.hs b/Utility/Scheduled.hs
new file mode 100644
--- /dev/null
+++ b/Utility/Scheduled.hs
@@ -0,0 +1,358 @@
+{- scheduled activities
+ - 
+ - Copyright 2013 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Utility.Scheduled (
+	Schedule(..),
+	Recurrance(..),
+	ScheduledTime(..),
+	NextTime(..),
+	WeekDay,
+	MonthDay,
+	YearDay,
+	nextTime,
+	startTime,
+	fromSchedule,
+	fromScheduledTime,
+	toScheduledTime,
+	fromRecurrance,
+	toRecurrance,
+	toSchedule,
+	parseSchedule,
+	prop_schedule_roundtrips
+) where
+
+import Utility.Data
+import Utility.QuickCheck
+import Utility.PartialPrelude
+import Utility.Misc
+
+import Control.Applicative
+import Data.List
+import Data.Time.Clock
+import Data.Time.LocalTime
+import Data.Time.Calendar
+import Data.Time.Calendar.WeekDate
+import Data.Time.Calendar.OrdinalDate
+import Data.Tuple.Utils
+import Data.Char
+
+{- Some sort of scheduled event. -}
+data Schedule = Schedule Recurrance ScheduledTime
+  deriving (Eq, Read, Show, Ord)
+
+data Recurrance
+	= Daily
+	| Weekly (Maybe WeekDay)
+	| Monthly (Maybe MonthDay)
+	| Yearly (Maybe YearDay)
+	| Divisible Int Recurrance
+	-- ^ Days, Weeks, or Months of the year evenly divisible by a number.
+	-- (Divisible Year is years evenly divisible by a number.)
+  deriving (Eq, Read, Show, Ord)
+
+type WeekDay = Int
+type MonthDay = Int
+type YearDay = Int
+
+data ScheduledTime
+	= AnyTime
+	| SpecificTime Hour Minute
+  deriving (Eq, Read, Show, Ord)
+
+type Hour = Int
+type Minute = Int
+
+{- Next time a Schedule should take effect. The NextTimeWindow is used
+ - when a Schedule is allowed to start at some point within the window. -}
+data NextTime
+	= NextTimeExactly LocalTime
+	| NextTimeWindow LocalTime LocalTime
+  deriving (Eq, Read, Show)
+
+startTime :: NextTime -> LocalTime
+startTime (NextTimeExactly t) = t
+startTime (NextTimeWindow t _) = t
+
+nextTime :: Schedule -> Maybe LocalTime -> IO (Maybe NextTime)
+nextTime schedule lasttime = do
+	now <- getCurrentTime
+	tz <- getTimeZone now
+	return $ calcNextTime schedule lasttime $ utcToLocalTime tz now
+
+{- Calculate the next time that fits a Schedule, based on the
+ - last time it occurred, and the current time. -}
+calcNextTime :: Schedule -> Maybe LocalTime -> LocalTime -> Maybe NextTime
+calcNextTime (Schedule recurrance scheduledtime) lasttime currenttime
+	| scheduledtime == AnyTime = do
+		next <- findfromtoday True
+		return $ case next of
+			NextTimeWindow _ _ -> next
+			NextTimeExactly t -> window (localDay t) (localDay t)
+	| otherwise = NextTimeExactly . startTime <$> findfromtoday False
+  where
+  	findfromtoday anytime = findfrom recurrance afterday today
+	  where
+	  	today = localDay currenttime
+		afterday = sameaslastday || toolatetoday
+		toolatetoday = not anytime && localTimeOfDay currenttime >= nexttime
+		sameaslastday = lastday == Just today
+	lastday = localDay <$> lasttime
+	nexttime = case scheduledtime of
+		AnyTime -> TimeOfDay 0 0 0
+		SpecificTime h m -> TimeOfDay h m 0
+	exactly d = NextTimeExactly $ LocalTime d nexttime
+	window startd endd = NextTimeWindow
+		(LocalTime startd nexttime)
+		(LocalTime endd (TimeOfDay 23 59 0))
+	findfrom r afterday day = case r of
+		Daily
+			| afterday -> Just $ exactly $ addDays 1 day
+			| otherwise -> Just $ exactly day
+		Weekly Nothing
+			| afterday -> skip 1
+			| otherwise -> case (wday <$> lastday, wday day) of
+				(Nothing, _) -> Just $ window day (addDays 6 day)
+				(Just old, curr)
+					| old == curr -> Just $ window day (addDays 6 day)
+					| otherwise -> skip 1
+		Monthly Nothing
+			| afterday -> skip 1
+			| maybe True (\old -> mnum day > mday old && mday day >= (mday old `mod` minmday)) lastday ->
+				-- Window only covers current month,
+				-- in case there is a Divisible requirement.
+				Just $ window day (endOfMonth day)
+			| otherwise -> skip 1
+		Yearly Nothing
+			| afterday -> skip 1
+			| maybe True (\old -> ynum day > ynum old && yday day >= (yday old `mod` minyday)) lastday ->
+				Just $ window day (endOfYear day)
+			| otherwise -> skip 1
+		Weekly (Just w)
+			| w < 0 || w > maxwday -> Nothing
+			| w == wday day -> if afterday
+				then Just $ exactly $ addDays 7 day
+				else Just $ exactly day
+			| otherwise -> Just $ exactly $
+				addDays (fromIntegral $ (w - wday day) `mod` 7) day
+		Monthly (Just m)
+			| m < 0 || m > maxmday -> Nothing
+			-- TODO can be done more efficiently than recursing
+			| m == mday day -> if afterday
+				then skip 1
+				else Just $ exactly day
+			| otherwise -> skip 1
+		Yearly (Just y)
+			| y < 0 || y > maxyday -> Nothing
+			| y == yday day -> if afterday
+				then skip 365
+				else Just $ exactly day
+			| otherwise -> skip 1
+		Divisible n r'@Daily -> handlediv n r' yday (Just maxyday)
+		Divisible n r'@(Weekly _) -> handlediv n r' wnum (Just maxwnum)
+		Divisible n r'@(Monthly _) -> handlediv n r' mnum (Just maxmnum)
+		Divisible n r'@(Yearly _) -> handlediv n r' ynum Nothing
+		Divisible _ r'@(Divisible _ _) -> findfrom r' afterday day
+	  where
+	  	skip n = findfrom r False (addDays n day)
+	  	handlediv n r' getval mmax
+			| n > 0 && maybe True (n <=) mmax =
+				findfromwhere r' (divisible n . getval) afterday day
+			| otherwise = Nothing
+	findfromwhere r p afterday day
+		| maybe True (p . getday) next = next
+		| otherwise = maybe Nothing (findfromwhere r p True . getday) next
+	  where
+		next = findfrom r afterday day
+		getday = localDay . startTime
+	divisible n v = v `rem` n == 0
+
+endOfMonth :: Day -> Day
+endOfMonth day =
+	let (y,m,_d) = toGregorian day
+	in fromGregorian y m (gregorianMonthLength y m)
+
+endOfYear :: Day -> Day
+endOfYear day =
+	let (y,_m,_d) = toGregorian day
+	in endOfMonth (fromGregorian y maxmnum 1)
+
+-- extracting various quantities from a Day
+wday :: Day -> Int
+wday = thd3 . toWeekDate
+wnum :: Day -> Int
+wnum = snd3 . toWeekDate
+mday :: Day -> Int
+mday = thd3 . toGregorian
+mnum :: Day -> Int
+mnum = snd3 . toGregorian
+yday :: Day -> Int
+yday = snd . toOrdinalDate
+ynum :: Day -> Int
+ynum = fromIntegral . fst . toOrdinalDate
+
+{- Calendar max and mins. -}
+maxyday :: Int
+maxyday = 366 -- with leap days
+minyday :: Int
+minyday = 365
+maxwnum :: Int
+maxwnum = 53 -- some years have more than 52
+maxmday :: Int
+maxmday = 31
+minmday :: Int
+minmday = 28
+maxmnum :: Int
+maxmnum = 12
+maxwday :: Int
+maxwday = 7
+
+fromRecurrance :: Recurrance -> String
+fromRecurrance (Divisible n r) =
+	fromRecurrance' (++ "s divisible by " ++ show n) r
+fromRecurrance r = fromRecurrance' ("every " ++) r
+
+fromRecurrance' :: (String -> String) -> Recurrance -> String
+fromRecurrance' a Daily = a "day"
+fromRecurrance' a (Weekly n) = onday n (a "week")
+fromRecurrance' a (Monthly n) = onday n (a "month")
+fromRecurrance' a (Yearly n) = onday n (a "year")
+fromRecurrance' a (Divisible _n r) = fromRecurrance' a r -- not used
+
+onday :: Maybe Int -> String -> String
+onday (Just n) s = "on day " ++ show n ++ " of " ++ s
+onday Nothing s = s
+
+toRecurrance :: String -> Maybe Recurrance
+toRecurrance s = case words s of
+	("every":"day":[]) -> Just Daily
+	("on":"day":sd:"of":"every":something:[]) -> withday sd something
+	("every":something:[]) -> noday something
+	("days":"divisible":"by":sn:[]) -> 
+		Divisible <$> getdivisor sn <*> pure Daily
+	("on":"day":sd:"of":something:"divisible":"by":sn:[]) -> 
+		Divisible
+			<$> getdivisor sn
+			<*> withday sd something
+	("every":something:"divisible":"by":sn:[]) -> 
+		Divisible
+			<$> getdivisor sn
+			<*> noday something
+	(something:"divisible":"by":sn:[]) -> 
+		Divisible
+			<$> getdivisor sn
+			<*> noday something
+	_ -> Nothing
+  where
+	constructor "week" = Just Weekly
+	constructor "month" = Just Monthly
+	constructor "year" = Just Yearly
+	constructor u
+		| "s" `isSuffixOf` u = constructor $ reverse $ drop 1 $ reverse u
+		| otherwise = Nothing
+  	withday sd u = do
+		c <- constructor u
+		d <- readish sd
+		Just $ c (Just d)
+	noday u = do
+		c <- constructor u
+		Just $ c Nothing
+	getdivisor sn = do
+		n <- readish sn
+		if n > 0
+			then Just n
+			else Nothing
+
+fromScheduledTime :: ScheduledTime -> String
+fromScheduledTime AnyTime = "any time"
+fromScheduledTime (SpecificTime h m) = 
+	show h' ++ (if m > 0 then ":" ++ pad 2 (show m) else "") ++ " " ++ ampm
+  where
+  	pad n s = take (n - length s) (repeat '0') ++ s
+	(h', ampm)
+		| h == 0 = (12, "AM")
+		| h < 12 = (h, "AM")
+		| h == 12 = (h, "PM")
+		| otherwise = (h - 12, "PM")
+
+toScheduledTime :: String -> Maybe ScheduledTime
+toScheduledTime "any time" = Just AnyTime
+toScheduledTime v = case words v of
+	(s:ampm:[])
+		| map toUpper ampm == "AM" ->
+			go s h0
+		| map toUpper ampm == "PM" ->
+			go s (\h -> (h0 h) + 12)
+		| otherwise -> Nothing
+	(s:[]) -> go s id
+	_ -> Nothing
+  where
+  	h0 h
+		| h == 12 = 0
+		| otherwise = h
+  	go :: String -> (Int -> Int) -> Maybe ScheduledTime
+	go s adjust =
+		let (h, m) = separate (== ':') s
+		in SpecificTime
+			<$> (adjust <$> readish h)
+			<*> if null m then Just 0 else readish m
+
+fromSchedule :: Schedule -> String
+fromSchedule (Schedule recurrance scheduledtime) = unwords
+	[ fromRecurrance recurrance
+	, "at"
+	, fromScheduledTime scheduledtime
+	]
+
+toSchedule :: String -> Maybe Schedule
+toSchedule = eitherToMaybe . parseSchedule
+
+parseSchedule :: String -> Either String Schedule
+parseSchedule s = do
+	r <- maybe (Left $ "bad recurrance: " ++ recurrance) Right
+		(toRecurrance recurrance)
+	t <- maybe (Left $ "bad time of day: " ++ scheduledtime) Right
+		(toScheduledTime scheduledtime)
+	Right $ Schedule r t
+  where
+	(rws, tws) = separate (== "at") (words s)
+	recurrance = unwords rws
+	scheduledtime = unwords tws
+
+instance Arbitrary Schedule where
+	arbitrary = Schedule <$> arbitrary <*> arbitrary
+
+instance Arbitrary ScheduledTime where
+	arbitrary = oneof
+		[ pure AnyTime
+		, SpecificTime 
+			<$> choose (0, 23)
+			<*> choose (1, 59)
+		]
+
+instance Arbitrary Recurrance where
+	arbitrary = oneof
+		[ pure Daily
+		, Weekly <$> arbday
+		, Monthly <$> arbday
+		, Yearly <$> arbday
+		, Divisible
+			<$> positive arbitrary
+			<*> oneof -- no nested Divisibles
+				[ pure Daily
+				, Weekly <$> arbday
+				, Monthly <$> arbday
+				, Yearly <$> arbday
+				]
+		]
+	  where
+	  	arbday = oneof
+			[ Just <$> nonNegative arbitrary
+			, pure Nothing
+			]
+
+prop_schedule_roundtrips :: Schedule -> Bool
+prop_schedule_roundtrips s = toSchedule (fromSchedule s) == Just s
diff --git a/config-joey.hs b/config-joey.hs
--- a/config-joey.hs
+++ b/config-joey.hs
@@ -2,6 +2,7 @@
 
 import Propellor
 import Propellor.CmdLine
+import Propellor.Property.Scheduled
 import qualified Propellor.Property.File as File
 import qualified Propellor.Property.Apt as Apt
 import qualified Propellor.Property.Network as Network
@@ -12,124 +13,167 @@
 import qualified Propellor.Property.Hostname as Hostname
 --import qualified Propellor.Property.Reboot as Reboot
 import qualified Propellor.Property.Tor as Tor
+import qualified Propellor.Property.Dns as Dns
+import qualified Propellor.Property.OpenId as OpenId
 import qualified Propellor.Property.Docker as Docker
+import qualified Propellor.Property.Git as Git
 import qualified Propellor.Property.SiteSpecific.GitHome as GitHome
 import qualified Propellor.Property.SiteSpecific.GitAnnexBuilder as GitAnnexBuilder
 import qualified Propellor.Property.SiteSpecific.JoeySites as JoeySites
-import Data.List
 
-main :: IO ()
-main = defaultMain [host, Docker.containerProperties container]
+hosts :: [Host]
+hosts =
+	-- My laptop
+	[ host "darkstar.kitenet.net"
+		& Docker.configured
+		& Apt.buildDep ["git-annex"] `period` Daily
 
--- | This is where the system's HostName, either as returned by uname
--- or one specified on the command line, is converted into a list of
--- Properties for that system.
---
--- Edit this to configure propellor!
-host :: HostName -> Maybe [Property]
--- Clam is a tor bridge, and an olduse.net shellbox and other fun stuff.
-host hostname@"clam.kitenet.net" = standardSystem Unstable $ props
-	& cleanCloudAtCost hostname
-	& Apt.unattendedUpgrades
-	& Network.ipv6to4
-	& Apt.installed ["git-annex", "mtr"]
-	& Tor.isBridge
-	& JoeySites.oldUseNetshellBox
-	& Docker.configured
-	& Docker.garbageCollected
--- Orca is the main git-annex build box.
-host hostname@"orca.kitenet.net" = standardSystem Unstable $ props
-	& Hostname.set hostname
-	& Apt.unattendedUpgrades
-	& Docker.configured
-	& Apt.buildDep ["git-annex"]
-	& Docker.docked container hostname "amd64-git-annex-builder"
-	& Docker.docked container hostname "i386-git-annex-builder"
-	& Docker.docked container hostname "armel-git-annex-builder-companion"
-	& Docker.docked container hostname "armel-git-annex-builder"
-	& Docker.garbageCollected
--- My laptop
-host _hostname@"darkstar.kitenet.net" = Just $ props
-	& Docker.configured
+	-- Nothing super-important lives here.
+	, standardSystem "clam.kitenet.net" Unstable
+		& cleanCloudAtCost
+		& Apt.unattendedUpgrades
+		& Network.ipv6to4
+		& Tor.isBridge
+		& Docker.configured
+		& cname "shell.olduse.net"
+		& JoeySites.oldUseNetShellBox
+
+		& cname "openid.kitenet.net"
+		& Docker.docked hosts "openid-provider"
+		 	`requires` Apt.installed ["ntp"]
+
+		& cname "ancient.kitenet.net"
+		& Docker.docked hosts "ancient-kitenet"
+
+		& Docker.garbageCollected `period` Daily
+		& Apt.installed ["git-annex", "mtr", "screen"]
 	
--- add more hosts here...
---host "foo.example.com" =
-host _ = Nothing
+	-- Orca is the main git-annex build box.
+	, standardSystem "orca.kitenet.net" Unstable
+		& Hostname.sane
+		& Apt.unattendedUpgrades
+		& Docker.configured
+		& Docker.docked hosts "amd64-git-annex-builder"
+		& Docker.docked hosts "i386-git-annex-builder"
+		! Docker.docked hosts "armel-git-annex-builder-companion"
+		! Docker.docked hosts "armel-git-annex-builder"
+		& Docker.garbageCollected `period` Daily
+		& Apt.buildDep ["git-annex"] `period` Daily
+	
+	-- Important stuff that needs not too much memory or CPU.
+  	, standardSystem "diatom.kitenet.net" Stable
+		& Hostname.sane
+		& Apt.unattendedUpgrades
+		& Apt.serviceInstalledRunning "ntp"
+		& Dns.zones myDnsSecondary
+		& Apt.serviceInstalledRunning "apache2"
+		& Apt.installed ["git", "git-annex", "rsync"]
+		& Apt.buildDep ["git-annex"] `period` Daily
+		& Git.daemonRunning "/srv/git"
+		& File.ownerGroup "/srv/git" "joey" "joey"
+		-- git repos restore (how?)
+		-- family annex needs family members to have accounts,
+		--     ssh host key etc.. finesse?
+		--   (also should upgrade git-annex-shell for it..)
+		-- kgb installation and setup
+		-- ssh keys for branchable and github repo hooks
+		-- gitweb
+		-- downloads.kitenet.net setup (including ssh key to turtle)
 
--- | This is where Docker containers are set up. A container
--- can vary by hostname where it's used, or be the same everywhere.
-container :: HostName -> Docker.ContainerName -> Maybe (Docker.Container)
-container _host name
-	| name == "webserver" = Just $ Docker.containerFrom
-		(image $ System (Debian Unstable) "amd64")
-		[ Docker.publish "8080:80"
-		, Docker.volume "/var/www:/var/www"
-		, Docker.inside $ props
-			& serviceRunning "apache2"
-				`requires` Apt.installed ["apache2"]
-		]
+	--------------------------------------------------------------------
+	--  Docker Containers  ----------------------------------- \o/ -----
+	--------------------------------------------------------------------
+
+	-- Simple web server, publishing the outside host's /var/www
+	, standardContainer "webserver" Stable "amd64"
+		& Docker.publish "8080:80"
+		& Docker.volume "/var/www:/var/www"
+		& Apt.serviceInstalledRunning "apache2"
+
+	-- My own openid provider. Uses php, so containerized for security
+	-- and administrative sanity.
+	, standardContainer "openid-provider" Stable "amd64"
+		& Docker.publish "8081:80"
+		& OpenId.providerFor ["joey", "liw"]
+			"openid.kitenet.net:8081"
 	
+	, standardContainer "ancient-kitenet" Stable "amd64"
+		& Docker.publish "1994:80"
+		& Apt.serviceInstalledRunning "apache2"
+		& Apt.installed ["git"]
+		& scriptProperty 
+			[ "cd /var/"
+			, "rm -rf www"
+			, "git clone git://git.kitenet.net/kitewiki www"
+			, "cd www"
+			, "git checkout remotes/origin/old-kitenet.net"
+			] `flagFile` "/var/www/blastfromthepast.html"
+	
+	-- git-annex autobuilder containers
+	, gitAnnexBuilder "amd64" 15
+	, gitAnnexBuilder "i386" 45
 	-- armel builder has a companion container that run amd64 and
 	-- runs the build first to get TH splices. They share a home
 	-- directory, and need to have the same versions of all haskell
 	-- libraries installed.
-	| name == "armel-git-annex-builder-companion" = Just $ Docker.containerFrom
+	, Docker.container "armel-git-annex-builder-companion"
 		(image $ System (Debian Unstable) "amd64")
-		[ Docker.volume GitAnnexBuilder.homedir
-		]
-	| name == "armel-git-annex-builder" = Just $ Docker.containerFrom
+		& Docker.volume GitAnnexBuilder.homedir
+		& Apt.unattendedUpgrades
+	, Docker.container "armel-git-annex-builder"
 		(image $ System (Debian Unstable) "armel")
-		[ Docker.link (name ++ "-companion") "companion"
-		, Docker.volumes_from (name ++ "-companion")
-		, Docker.inside $ props
---			& GitAnnexBuilder.builder "armel" "15 * * * *" True
-		]
-	
-	| "-git-annex-builder" `isSuffixOf` name =
-		let arch = takeWhile (/= '-') name
-		in Just $ Docker.containerFrom
-			(image $ System (Debian Unstable) arch)
-			[ Docker.inside $ props & GitAnnexBuilder.builder arch "15 * * * *" True ]
-	
-	| otherwise = Nothing
+		& Docker.link "armel-git-annex-builder-companion" "companion"
+		& Docker.volumes_from "armel-git-annex-builder-companion"
+--		& GitAnnexBuilder.builder "armel" "15 * * * *" True
+		& Apt.unattendedUpgrades
+	]
 
+gitAnnexBuilder :: Architecture -> Int -> Host
+gitAnnexBuilder arch buildminute = Docker.container (arch ++ "-git-annex-builder")
+	(image $ System (Debian Unstable) arch)
+	& GitAnnexBuilder.builder arch (show buildminute ++ " * * * *") True
+	& Apt.unattendedUpgrades
+
+-- This is my standard system setup.
+standardSystem :: HostName -> DebianSuite -> Host
+standardSystem hn suite = host hn
+	& Apt.stdSourcesList suite `onChange` Apt.upgrade
+	& Apt.installed ["etckeeper"]
+	& Apt.installed ["ssh"]
+	& GitHome.installedFor "root"
+	& User.hasSomePassword "root"
+	-- Harden the system, but only once root's authorized_keys
+	-- is safely in place.
+	& check (Ssh.hasAuthorizedKeys "root")
+		(Ssh.passwordAuthentication False)
+	& User.accountFor "joey"
+	& User.hasSomePassword "joey"
+	& Sudo.enabledFor "joey"
+	& GitHome.installedFor "joey"
+	& Apt.installed ["vim", "screen", "less"]
+	& Cron.runPropellor "30 * * * *"
+	-- I use postfix, or no MTA.
+	& Apt.removed ["exim4", "exim4-daemon-light", "exim4-config", "exim4-base"]
+		`onChange` Apt.autoRemove
+
+-- This is my standard container setup, featuring automatic upgrades.
+standardContainer :: Docker.ContainerName -> DebianSuite -> Architecture -> Host
+standardContainer name suite arch = Docker.container name (image system)
+	& Apt.stdSourcesList suite
+	& Apt.unattendedUpgrades
+  where
+	system = System (Debian suite) arch
+
 -- | Docker images I prefer to use.
 image :: System -> Docker.Image
 image (System (Debian Unstable) arch) = "joeyh/debian-unstable-" ++ arch
+image (System (Debian Stable) arch) = "joeyh/debian-stable-" ++ arch
 image _ = "debian-stable-official" -- does not currently exist!
 
--- This is my standard system setup
-standardSystem :: DebianSuite -> [Property] -> Maybe [Property]
-standardSystem suite customprops = Just $
-	standardprops : customprops ++ endprops
-  where
-	standardprops = propertyList "standard system" $ props
-		& Apt.stdSourcesList suite `onChange` Apt.upgrade
-		& Apt.installed ["etckeeper"]
-		& Apt.installed ["ssh"]
-		& GitHome.installedFor "root"
-		& User.hasSomePassword "root"
-		-- Harden the system, but only once root's authorized_keys
-		-- is safely in place.
-		& check (Ssh.hasAuthorizedKeys "root")
-			(Ssh.passwordAuthentication False)
-		& User.accountFor "joey"
-		& User.hasSomePassword "joey"
-		& Sudo.enabledFor "joey"
-		& GitHome.installedFor "joey"
-		& Apt.installed ["vim", "screen", "less"]
-		& Cron.runPropellor "30 * * * *"
-		-- I use postfix, or no MTA.
-		& Apt.removed ["exim4", "exim4-daemon-light", "exim4-config", "exim4-base"]
-			`onChange` Apt.autoRemove
-	-- May reboot, so comes last
-	-- Currently not enable due to #726375 
-	endprops = [] -- [Apt.installed ["systemd-sysv"] `onChange` Reboot.now]
-
 -- Clean up a system as installed by cloudatcost.com
-cleanCloudAtCost :: HostName -> Property
-cleanCloudAtCost hostname = propertyList "cloudatcost cleanup"
-	[ Hostname.set hostname
+cleanCloudAtCost :: Property
+cleanCloudAtCost = propertyList "cloudatcost cleanup"
+	[ Hostname.sane
 	, Ssh.uniqueHostKeys
 	, "worked around grub/lvm boot bug #743126" ==>
 		"/etc/default/grub" `File.containsLine` "GRUB_DISABLE_LINUX_UUID=true"
@@ -141,3 +185,18 @@
 		, User.nuked "user" User.YesReallyDeleteHome
 		]
 	]
+
+myDnsSecondary :: [Dns.Zone]
+myDnsSecondary =
+	[ Dns.secondary "kitenet.net" master
+	, Dns.secondary "joeyh.name" master
+	, Dns.secondary "ikiwiki.info" master
+	, Dns.secondary "olduse.net" master
+	, Dns.secondary "branchable.com" branchablemaster
+	]
+  where
+	master = ["80.68.85.49", "2001:41c8:125:49::10"] -- wren
+	branchablemaster = ["66.228.46.55", "2600:3c03::f03c:91ff:fedf:c0e5"]
+
+main :: IO ()
+main = defaultMain hosts --, Docker.containerProperties container]
diff --git a/config-simple.hs b/config-simple.hs
--- a/config-simple.hs
+++ b/config-simple.hs
@@ -3,6 +3,7 @@
 
 import Propellor
 import Propellor.CmdLine
+import Propellor.Property.Scheduled
 import qualified Propellor.Property.File as File
 import qualified Propellor.Property.Apt as Apt
 import qualified Propellor.Property.Network as Network
@@ -15,39 +16,32 @@
 --import qualified Propellor.Property.Tor as Tor
 import qualified Propellor.Property.Docker as Docker
 
-main :: IO ()
-main = defaultMain [host, Docker.containerProperties container]
-
--- | This is where the system's HostName, either as returned by uname
--- or one specified on the command line, is converted into a list of
--- Properties for that system.
---
+-- The hosts propellor knows about.
 -- Edit this to configure propellor!
-host :: HostName -> Maybe [Property]
-host hostname@"mybox.example.com" = Just $ props
-	& Apt.stdSourcesList Unstable
-		`onChange` Apt.upgrade
-	& Apt.unattendedUpgrades
-	& Apt.installed ["etckeeper"]
-	& Apt.installed ["ssh"]
-	& User.hasSomePassword "root"
-	& Network.ipv6to4
-	& File.dirExists "/var/www"
-	& Docker.docked container hostname "webserver"
-	& Docker.garbageCollected
-	& Cron.runPropellor "30 * * * *"
--- add more hosts here...
---host "foo.example.com" =
-host _ = Nothing
+hosts :: [Host]
+hosts =
+	[ host "mybox.example.com"
+		& Apt.stdSourcesList Unstable
+			`onChange` Apt.upgrade
+		& Apt.unattendedUpgrades
+		& Apt.installed ["etckeeper"]
+		& Apt.installed ["ssh"]
+		& User.hasSomePassword "root"
+		& Network.ipv6to4
+		& File.dirExists "/var/www"
+		& Docker.docked hosts "webserver"
+		& Docker.garbageCollected `period` Daily
+		& Cron.runPropellor "30 * * * *"
 
--- | This is where Docker containers are set up. A container
--- can vary by hostname where it's used, or be the same everywhere.
-container :: HostName -> Docker.ContainerName -> Maybe (Docker.Container)
-container _ "webserver" = Just $ Docker.containerFrom "joeyh/debian-unstable"
-	[ Docker.publish "80:80"
-	, Docker.volume "/var/www:/var/www"
-	, Docker.inside $ props
-		& serviceRunning "apache2"
-			`requires` Apt.installed ["apache2"]
+	-- A generic webserver in a Docker container.
+	, Docker.container "webserver" "joeyh/debian-unstable"
+		& Docker.publish "80:80"
+		& Docker.volume "/var/www:/var/www"
+		& Apt.serviceInstalledRunning "apache2"
+
+	-- add more hosts here...
+	--, host "foo.example.com" = ...
 	]
-container _ _ = Nothing
+
+main :: IO ()
+main = defaultMain hosts
diff --git a/config.hs b/config.hs
--- a/config.hs
+++ b/config.hs
@@ -3,6 +3,7 @@
 
 import Propellor
 import Propellor.CmdLine
+import Propellor.Property.Scheduled
 import qualified Propellor.Property.File as File
 import qualified Propellor.Property.Apt as Apt
 import qualified Propellor.Property.Network as Network
@@ -15,39 +16,32 @@
 --import qualified Propellor.Property.Tor as Tor
 import qualified Propellor.Property.Docker as Docker
 
-main :: IO ()
-main = defaultMain [host, Docker.containerProperties container]
-
--- | This is where the system's HostName, either as returned by uname
--- or one specified on the command line, is converted into a list of
--- Properties for that system.
---
+-- The hosts propellor knows about.
 -- Edit this to configure propellor!
-host :: HostName -> Maybe [Property]
-host hostname@"mybox.example.com" = Just $ props
-	& Apt.stdSourcesList Unstable
-		`onChange` Apt.upgrade
-	& Apt.unattendedUpgrades
-	& Apt.installed ["etckeeper"]
-	& Apt.installed ["ssh"]
-	& User.hasSomePassword "root"
-	& Network.ipv6to4
-	& File.dirExists "/var/www"
-	& Docker.docked container hostname "webserver"
-	& Docker.garbageCollected
-	& Cron.runPropellor "30 * * * *"
--- add more hosts here...
---host "foo.example.com" =
-host _ = Nothing
+hosts :: [Host]
+hosts =
+	[ host "mybox.example.com"
+		& Apt.stdSourcesList Unstable
+			`onChange` Apt.upgrade
+		& Apt.unattendedUpgrades
+		& Apt.installed ["etckeeper"]
+		& Apt.installed ["ssh"]
+		& User.hasSomePassword "root"
+		& Network.ipv6to4
+		& File.dirExists "/var/www"
+		& Docker.docked hosts "webserver"
+		& Docker.garbageCollected `period` Daily
+		& Cron.runPropellor "30 * * * *"
 
--- | This is where Docker containers are set up. A container
--- can vary by hostname where it's used, or be the same everywhere.
-container :: HostName -> Docker.ContainerName -> Maybe (Docker.Container)
-container _ "webserver" = Just $ Docker.containerFrom "joeyh/debian-unstable"
-	[ Docker.publish "80:80"
-	, Docker.volume "/var/www:/var/www"
-	, Docker.inside $ props
-		& serviceRunning "apache2"
-			`requires` Apt.installed ["apache2"]
+	-- A generic webserver in a Docker container.
+	, Docker.container "webserver" "joeyh/debian-unstable"
+		& Docker.publish "80:80"
+		& Docker.volume "/var/www:/var/www"
+		& Apt.serviceInstalledRunning "apache2"
+
+	-- add more hosts here...
+	--, host "foo.example.com" = ...
 	]
-container _ _ = Nothing
+
+main :: IO ()
+main = defaultMain hosts
diff --git a/debian/changelog b/debian/changelog
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,18 @@
+propellor (0.3.0) unstable; urgency=medium
+
+  * ipv6to4: Ensure interface is brought up automatically on boot.
+  * Enabling unattended upgrades now ensures that cron is installed and
+    running to perform them.
+  * Properties can be scheduled to only be checked after a given time period.
+  * Fix bootstrapping of dependencies.
+  * Fix compilation on Debian stable.
+  * Include security updates in sources.list for stable and testing.
+  * Use ssh connection caching, especially when bootstrapping.
+  * Properties now run in a Propellor monad, which provides access to
+    attributes of the host.
+
+ -- Joey Hess <joeyh@debian.org>  Fri, 11 Apr 2014 01:19:05 -0400
+
 propellor (0.2.3) unstable; urgency=medium
 
   * docker: Fix laziness bug that caused running containers to be
diff --git a/debian/control b/debian/control
--- a/debian/control
+++ b/debian/control
@@ -11,6 +11,8 @@
 	libghc-unix-compat-dev,
 	libghc-ansi-terminal-dev,
 	libghc-ifelse-dev,
+	libghc-mtl-dev,
+	libghc-monadcatchio-transformers-dev,
 Maintainer: Joey Hess <joeyh@debian.org>
 Standards-Version: 3.9.5
 Vcs-Git: git://git.kitenet.net/propellor
@@ -28,6 +30,8 @@
 	libghc-unix-compat-dev,
 	libghc-ansi-terminal-dev,
 	libghc-ifelse-dev,
+	libghc-mtl-dev,
+	libghc-monadcatchio-transformers-dev,
 	git,
 Description: property-based host configuration management in haskell
  Propellor enures that the system it's run in satisfies a list of
diff --git a/propellor.cabal b/propellor.cabal
--- a/propellor.cabal
+++ b/propellor.cabal
@@ -1,5 +1,5 @@
 Name: propellor
-Version: 0.2.3
+Version: 0.3.0
 Cabal-Version: >= 1.6
 License: GPL
 Maintainer: Joey Hess <joey@kitenet.net>
@@ -38,7 +38,8 @@
   GHC-Options: -Wall
   Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, 
    IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal,
-   containers, network, async
+   containers, network, async, time, QuickCheck, mtl,
+   MonadCatchIO-transformers
   
   if (! os(windows))
     Build-Depends: unix
@@ -48,7 +49,8 @@
   GHC-Options: -Wall -threaded
   Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, 
    IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal,
-   containers, network, async
+   containers, network, async, time, QuickCheck, mtl,
+   MonadCatchIO-transformers
 
   if (! os(windows))
     Build-Depends: unix
@@ -57,7 +59,8 @@
   GHC-Options: -Wall
   Build-Depends: MissingH, directory, filepath, base >= 4.5, base < 5, 
    IfElse, process, bytestring, hslogger, unix-compat, ansi-terminal,
-   containers, network, async
+   containers, network, async, time, QuickCheck, mtl,
+   MonadCatchIO-transformers
 
   if (! os(windows))
     Build-Depends: unix
@@ -69,10 +72,15 @@
     Propellor.Property.Cmd
     Propellor.Property.Hostname
     Propellor.Property.Cron
+    Propellor.Property.Dns
     Propellor.Property.Docker
     Propellor.Property.File
+    Propellor.Property.Git
     Propellor.Property.Network
+    Propellor.Property.OpenId
     Propellor.Property.Reboot
+    Propellor.Property.Scheduled
+    Propellor.Property.Service
     Propellor.Property.Ssh
     Propellor.Property.Sudo
     Propellor.Property.Tor
@@ -80,11 +88,14 @@
     Propellor.Property.SiteSpecific.GitHome
     Propellor.Property.SiteSpecific.JoeySites
     Propellor.Property.SiteSpecific.GitAnnexBuilder
+    Propellor.Attr
     Propellor.Message
     Propellor.PrivData
     Propellor.Engine
+    Propellor.Exception
     Propellor.Types
   Other-Modules:
+    Propellor.Types.Attr
     Propellor.CmdLine
     Propellor.SimpleSh
     Propellor.Property.Docker.Shim
@@ -103,9 +114,11 @@
     Utility.PosixFiles
     Utility.Process
     Utility.SafeCommand
+    Utility.Scheduled
     Utility.ThreadScheduler
     Utility.Tmp
     Utility.UserInfo
+    Utility.QuickCheck
 
 source-repository head
   type: git