Fix bug that caused bad information to be written to the git-annex branch when running describe or other commands with a remote that has no uuid.

Still need to fix crash caused by the bad info.

Remote.hs

@@ -90,11 +90,12 @@ byNameWithUUID = checkuuid <=< byName
   where
   	checkuuid Nothing = return Nothing
 	checkuuid (Just r)
-		| uuid r == NoUUID = do
-			let e = "cannot determine uuid for " ++ name r
+		| uuid r == NoUUID =
 			if remoteAnnexIgnore (gitconfig r)
-				then error $ e ++ " (" ++ show (remoteConfig (repo r) "ignore") ++ " is set)"
-				else error e
+				then error $ noRemoteUUIDMsg r ++
+					" (" ++ show (remoteConfig (repo r) "ignore") ++
+					" is set)"
+				else error $ noRemoteUUIDMsg r
 		| otherwise = return $ Just r
 
 byName' :: RemoteName -> Annex (Either String Remote)
@@ -111,16 +112,21 @@ byNameOnly n = headMaybe . filter matching <$> remoteList
   where
 	matching r = n == name r
 
+noRemoteUUIDMsg :: Remote -> String
+noRemoteUUIDMsg r = "cannot determine uuid for " ++ name r
+
 {- Looks up a remote by name (or by UUID, or even by description),
- - and returns its UUID. Finds even remotes that are not configured in
- - .git/config. -}
+ - and returns its UUID. Finds even repositories that are not
+ - configured in .git/config. -}
 nameToUUID :: RemoteName -> Annex UUID
 nameToUUID "." = getUUID -- special case for current repo
 nameToUUID "here" = getUUID
 nameToUUID "" = error "no remote specified"
 nameToUUID n = byName' n >>= go
   where
-	go (Right r) = return $ uuid r
+	go (Right r) = case uuid r of
+		NoUUID -> error $ noRemoteUUIDMsg r
+		u -> return u
 	go (Left e) = fromMaybe (error e) <$> bydescription
 	bydescription = do
 		m <- uuidMap

debian/changelog

@@ -22,6 +22,8 @@ git-annex (5.20131102) UNRELEASED; urgency=low
   * Include ssh-keygen in standalone bundle.
   * Allow optionally configuring git-annex with -fEKG to enable awesome
     remote monitoring interfaceat http://localhost:4242/
+  * Fix bug that caused bad information to be written to the git-annex branch
+    when running describe or other commands with a remote that has no uuid.
 
  -- Joey Hess <joeyh@debian.org>  Wed, 06 Nov 2013 16:14:14 -0400