avoid some read

Config.hs

@@ -79,9 +79,10 @@ repoNotIgnored r = not . Git.configTrue <$> getConfig r "ignore" "false"
 {- If a value is specified, it is used; otherwise the default is looked up
  - in git config. forcenumcopies overrides everything. -}
 getNumCopies :: Maybe Int -> Annex Int
-getNumCopies v = 
+getNumCopies v = perhaps (use v) =<< Annex.getState Annex.forcenumcopies
-	Annex.getState Annex.forcenumcopies >>= maybe (use v) (return . id)
 	where
 		use (Just n) = return n
-		use Nothing = read <$> fromRepo (Git.configGet config "1")
+		use Nothing = perhaps (return 1) =<< 
+			readMaybe <$> fromRepo (Git.configGet config "1")
+		perhaps fallback = maybe fallback (return . id)
 		config = "annex.numcopies"

Git.hs

@@ -345,7 +345,7 @@ urlPort :: Repo -> Maybe Integer
 urlPort r = 
 	case urlAuthPart uriPort r of
 		":" -> Nothing
-		(':':p) -> Just (read p)
+		(':':p) -> readMaybe p
 		_ -> Nothing
 
 {- Hostname of an URL repo, including any username (ie, "user@host") -}

Utility/BadPrelude.hs

@@ -22,3 +22,7 @@ init = Prelude.init
 {- last too -}
 last :: [a] -> a
 last = Prelude.last
+
+{- read should be avoided, as it throws an error -}
+read :: Read a => String -> a
+read = Prelude.read