more description improvements

Propellor.hs

@@ -64,7 +64,8 @@ cleanCloudAtCost hostname = propertyList "cloudatcost cleanup"
 		`onChange` cmdProperty "update-grub" []
 		`onChange` cmdProperty "update-initramfs" [Param "-u"]
 		`describe` "work around grub/lvm boot bug #743126"
-	-- Cruft
-	, File.notPresent "/etc/rc.local"
+	, combineProperties
+		[ File.notPresent "/etc/rc.local"
 		, File.notPresent "/etc/init.d/S97-setup.sh"
+		] `describe` "nuked cloudatcost cruft"
 	]

Property.hs

@@ -43,8 +43,8 @@ propertyList desc ps = Property desc $ ensureProperties' ps
 
 {- Combines a list of properties, resulting in one property that
  - ensures each in turn, stopping on failure. -}
-combineProperties :: Desc -> [Property] -> Property
-combineProperties desc ps = Property desc $ go ps NoChange
+combineProperties :: [Property] -> Property
+combineProperties ps = Property desc $ go ps NoChange
   where
   	go [] rs = return rs
 	go (l:ls) rs = do
@@ -52,6 +52,9 @@ combineProperties desc ps = Property desc $ go ps NoChange
 		case r of
 			FailedChange -> return FailedChange
 			_ -> go ls (combineResult r rs)
+	desc = case ps of
+		(p:_) -> propertyDesc p
+		_ -> "(empty)"
 
 {- Makes a perhaps non-idempotent Property be idempotent by using a flag
  - file to indicate whether it has run before.
@@ -81,7 +84,7 @@ property `onChange` hook = Property (propertyDesc property) $ do
 {- Indicates that the first property can only be satisfied once
  - the second is. -} 
 requires :: Property -> Property -> Property
-x `requires` y = combineProperties (propertyDesc x) [y, x]
+x `requires` y = combineProperties [y, x] `describe` propertyDesc x
 
 describe :: Property -> Desc -> Property
 describe p d = p { propertyDesc = d }

Property/Ssh.hs

@@ -12,12 +12,13 @@ sshdConfig :: FilePath
 sshdConfig = "/etc/ssh/sshd_config"
 
 setSshdConfig :: String -> Bool -> Property
-setSshdConfig setting allowed = combineProperties desc
+setSshdConfig setting allowed = combineProperties
 	[ sshdConfig `File.lacksLine` (sshline $ not allowed)
 	, sshdConfig `File.containsLine` (sshline allowed)
-	] `onChange` restartSshd
+	]
+	`onChange` restartSshd
+	`describe` unwords [ "ssh config:", setting, sshBool allowed ]
   where
-	desc = unwords [ "ssh config:", setting, sshBool allowed ]
 	sshline v = setting ++ " " ++ sshBool v
 
 permitRootLogin :: Bool -> Property