drop --auto: Fix bug that prevented dropping files from untrusted repositories.

This is a corresponding bug to the one I fixed yesterday in the assistant.

Command.hs

@@ -20,7 +20,6 @@ module Command (
 	isBareRepo,
 	numCopies,
 	numCopiesCheck,
-	autoCopiesWith,
 	checkAuto,
 	module ReExported
 ) where
@@ -109,26 +108,6 @@ numCopiesCheck file key vs = do
 	have <- trustExclude UnTrusted =<< Remote.keyLocations key
 	return $ length have `vs` needed
 
-{- Used for commands that have an auto mode that checks the number of known
- - copies of a key.
- -
- - In auto mode, first checks that the number of known
- - copies of the key is > or < than the numcopies setting, before running
- - the action.
- -}
-autoCopiesWith :: FilePath -> Key -> (Int -> Int -> Bool) -> (Maybe Int -> CommandStart) -> CommandStart
-autoCopiesWith file key vs a = do
-	numcopiesattr <- numCopies file
-	Annex.getState Annex.auto >>= auto numcopiesattr
-  where
-	auto numcopiesattr False = a numcopiesattr
-	auto numcopiesattr True = do
-		needed <- getNumCopies numcopiesattr
-		have <- trustExclude UnTrusted =<< Remote.keyLocations key
-		if length have `vs` needed
-			then a numcopiesattr
-			else stop
-
 checkAuto :: Annex Bool -> Annex Bool
 checkAuto checker = ifM (Annex.getState Annex.auto)
 	( checker , return True )

Command/Drop.hs

@@ -31,7 +31,7 @@ seek = [withField fromOption Remote.byNameWithUUID $ \from ->
 	withFilesInGit $ whenAnnexed $ start from]
 
 start :: Maybe Remote -> FilePath -> (Key, Backend) -> CommandStart
-start from file (key, _) = autoCopiesWith file key (>) $ \numcopies ->
+start from file (key, _) = checkDropAuto from file key $ \numcopies ->
 	stopUnless (checkAuto $ wantDrop False (Remote.uuid <$> from) (Just file)) $
 		case from of
 			Nothing -> startLocal file numcopies key Nothing
@@ -138,3 +138,24 @@ notEnoughCopies key need have skip bad = do
   where
 	unsafe = showNote "unsafe"
 	hint = showLongNote "(Use --force to override this check, or adjust annex.numcopies.)"
+
+{- In auto mode, only runs the action if there are enough copies
+ - copies on other semitrusted repositories.
+ -
+ - Passes any numcopies attribute of the file on to the action as an
+ - optimisation. -}
+checkDropAuto :: Maybe Remote -> FilePath -> Key -> (Maybe Int -> CommandStart) -> CommandStart
+checkDropAuto mremote file key a = do
+	numcopiesattr <- numCopies file
+	Annex.getState Annex.auto >>= auto numcopiesattr
+  where
+	auto numcopiesattr False = a numcopiesattr
+	auto numcopiesattr True = do
+		needed <- getNumCopies numcopiesattr
+		locs <- Remote.keyLocations key
+		uuid <- getUUID
+		let remoteuuid = fromMaybe uuid $ Remote.uuid <$> mremote
+		locs' <- trustExclude UnTrusted $ filter (/= remoteuuid) locs
+		if length locs' >= needed
+			then a numcopiesattr
+			else stop

debian/changelog

@@ -22,6 +22,8 @@ git-annex (4.20130324) UNRELEASED; urgency=low
   * Adjust built-in preferred content expressions to make most types
     of repositories want content that is only located on untrusted, dead,
     and unwanted repositories.
+  * drop --auto: Fix bug that prevented dropping files from untrusted
+    repositories.
 
  -- Joey Hess <joeyh@debian.org>  Mon, 25 Mar 2013 10:21:46 -0400