Automatically fix up badly formatted uuid.log entries produced by 3.20111105, whenever the uuid.log is changed (ie, by init or describe).

Logs/UUID.hs

@@ -36,7 +36,36 @@ describeUUID :: UUID -> String -> Annex ()
 describeUUID uuid desc = do
 	ts <- liftIO getPOSIXTime
 	Annex.Branch.change logfile $
-		showLog id . changeLog ts uuid desc . parseLog Just
+		showLog id . changeLog ts uuid desc . fixBadUUID . parseLog Just
+
+{- Temporarily here to fix badly formatted uuid logs generated by
+ - versions 3.20111105 and 3.20111025. 
+ -
+ - Those logs contain entries with the UUID and description flipped.
+ - Due to parsing, if the description is multiword, only the first
+ - will be taken to be the UUID. So, if the UUID of an entry does
+ - not look like a UUID, and the last word of the description does,
+ - flip them back.
+ -}
+fixBadUUID :: Log String -> Log String
+fixBadUUID = M.fromList . map fixup . M.toList
+	where
+		fixup (k, v)
+			| isbad = (fixeduuid, LogEntry (Date $ newertime v) fixedvalue)
+			| otherwise = (k, v)
+			where
+				kuuid = fromUUID k
+				isbad = (not $ isuuid kuuid) && isuuid lastword
+				ws = words $ value v
+				lastword = last ws
+				fixeduuid = toUUID lastword
+				fixedvalue = unwords $ kuuid:(take (length ws - 1) ws)
+		-- For the fixed line to take precidence, it should be
+		-- slightly newer, but only slightly.
+		newertime (LogEntry (Date d) _) = d + minimumPOSIXTimeSlice
+		newertime (LogEntry (Unknown) _) = minimumPOSIXTimeSlice
+		minimumPOSIXTimeSlice = 0.000001
+		isuuid s = length s == 36 && length (split "-" s) == 5
 
 {- Records the uuid in the log, if it's not already there. -}
 recordUUID :: UUID -> Annex ()