add a UUID type

Should have done this a long time ago.

Logs/Location.hs

@@ -29,16 +29,15 @@ import Logs.Presence
 
 {- Log a change in the presence of a key's value in a repository. -}
 logChange :: Git.Repo -> Key -> UUID -> LogStatus -> Annex ()
-logChange repo key u s
-	| null u = error $
-		"unknown UUID for " ++ Git.repoDescribe repo ++ 
-		" (have you run git annex init there?)"
-	| otherwise = addLog (logFile key) =<< logNow s u
+logChange _ key (UUID u) s = addLog (logFile key) =<< logNow s u
+logChange repo _ NoUUID _ = error $
+	"unknown UUID for " ++ Git.repoDescribe repo ++ 
+	" (have you run git annex init there?)"
 
 {- Returns a list of repository UUIDs that, according to the log, have
  - the value of a key. -}
 keyLocations :: Key -> Annex [UUID]
-keyLocations = currentLog . logFile
+keyLocations key = map read <$> (currentLog . logFile) key
 
 {- Finds all keys that have location log information.
  - (There may be duplicate keys in the list.) -}

Logs/Trust.hs

@@ -53,13 +53,12 @@ parseTrust s
 
 {- Changes the trust level for a uuid in the trustLog. -}
 trustSet :: UUID -> TrustLevel -> Annex ()
-trustSet uuid level = do
-	when (null uuid) $
-		error "unknown UUID; cannot modify trust level"
+trustSet uuid@(UUID _) level = do
 	ts <- liftIO $ getPOSIXTime
 	Annex.Branch.change trustLog $
 		showLog show . changeLog ts uuid level . parseLog parseTrust
 	Annex.changeState $ \s -> s { Annex.trustmap = Nothing }
+trustSet NoUUID _ = error "unknown UUID; cannot modify trust level"
 
 {- Partitions a list of UUIDs to those matching a TrustLevel and not. -}
 trustPartition :: TrustLevel -> [UUID] -> Annex ([UUID], [UUID])

Logs/UUIDBased.hs

@@ -50,9 +50,9 @@ showLog :: (a -> String) -> Log a -> String
 showLog shower = unlines . map showpair . M.toList
 	where
 		showpair (k, LogEntry (Date p) v) =
-			unwords [k, shower v, tskey ++ show p]
+			unwords [show k, shower v, tskey ++ show p]
 		showpair (k, LogEntry Unknown v) =
-			unwords [k, shower v]
+			unwords [show k, shower v]
 
 parseLog :: (String -> Maybe a) -> String -> Log a
 parseLog parser = M.fromListWith best . catMaybes . map pair . lines
@@ -61,7 +61,7 @@ parseLog parser = M.fromListWith best . catMaybes . map pair . lines
 			| null ws = Nothing
 			| otherwise = case parser $ unwords info of
 				Nothing -> Nothing
-				Just v -> Just (u, LogEntry c v)
+				Just v -> Just (read u, LogEntry c v)
 			where
 				ws = words line
 				u = head ws
@@ -103,8 +103,8 @@ prop_TimeStamp_sane = Unknown < Date 1
 prop_addLog_sane :: Bool
 prop_addLog_sane = newWins && newestWins
 	where
-		newWins = addLog "foo" (LogEntry (Date 1) "new") l == l2
-		newestWins = addLog "foo" (LogEntry (Date 1) "newest") l2 /= l2
+		newWins = addLog (UUID "foo") (LogEntry (Date 1) "new") l == l2
+		newestWins = addLog (UUID "foo") (LogEntry (Date 1) "newest") l2 /= l2
 
-		l = M.fromList [("foo", LogEntry (Date 0) "old")]
-		l2 = M.fromList [("foo", LogEntry (Date 1) "new")]
+		l = M.fromList [(UUID "foo", LogEntry (Date 0) "old")]
+		l2 = M.fromList [(UUID "foo", LogEntry (Date 1) "new")]

Logs/Web.hs

@@ -21,7 +21,7 @@ type URLString = String
 
 -- Dummy uuid for the whole web. Do not alter.
 webUUID :: UUID
-webUUID = "00000000-0000-0000-0000-000000000001"
+webUUID = UUID "00000000-0000-0000-0000-000000000001"
 
 {- The urls for a key are stored in remote/web/hash/key.log 
  - in the git-annex branch. -}