drop --auto --from with preferred content

With --from, it needs to examine the preferred content of the repository
being dropped from, instead of the local repository.

Command.hs

@@ -21,7 +21,7 @@ module Command (
 	isBareRepo,
 	numCopies,
 	autoCopies,
-	autoCopiesDrop,
+	autoCopiesWith,
 	module ReExported
 ) where
 
@@ -40,7 +40,6 @@ import Config
 import Annex.CheckAttr
 import Logs.PreferredContent
 import Git.FilePath
-import Annex.UUID
 
 import qualified Data.Set as S
 
@@ -135,13 +134,8 @@ autoCopies file key vs a = Annex.getState Annex.auto >>= go
 						( a, stop )
 				else stop
 
-{- For dropping, supplies the number of known copies to the action.
+autoCopiesWith :: FilePath -> Key -> (Int -> Int -> Bool) -> (Maybe Int -> CommandStart) -> CommandStart
- - 
+autoCopiesWith file key vs a = do
- - In auto mode, checks the number of known copies.
- - Also, checks if the repo would prefer to retain the content.
- -}
-autoCopiesDrop :: FilePath -> Key -> (Int -> Int -> Bool) -> (Maybe Int -> CommandStart) -> CommandStart
-autoCopiesDrop file key vs a = do
 	numcopiesattr <- numCopies file
 	Annex.getState Annex.auto >>= auto numcopiesattr
 	where
@@ -150,9 +144,5 @@ autoCopiesDrop file key vs a = do
 			needed <- getNumCopies numcopiesattr
 			(_, have) <- trustPartition UnTrusted =<< Remote.keyLocations key
 			if length have `vs` needed
-				then do
+				then a numcopiesattr
-					fp <- inRepo $ toTopFilePath file
-					u <- getUUID
-					ifM (isPreferredContent (Just u) (S.singleton u) fp)
-						( stop, a numcopiesattr )
 				else stop

Command/Drop.hs

@@ -17,6 +17,10 @@ import Logs.Trust
 import Annex.Content
 import Config
 import qualified Option
+import Git.FilePath
+import Logs.PreferredContent
+
+import qualified Data.Set as S
 
 def :: [Command]
 def = [withOptions [fromOption] $ command "drop" paramPaths seek
@@ -30,7 +34,7 @@ seek = [withField fromOption Remote.byName $ \from ->
 	withFilesInGit $ whenAnnexed $ start from]
 
 start :: Maybe Remote -> FilePath -> (Key, Backend) -> CommandStart
-start from file (key, _) = autoCopiesDrop file key (>) $ \numcopies ->
+start from file (key, _) = shouldDrop $ \numcopies ->
 	case from of
 		Nothing -> startLocal file numcopies key
 		Just remote -> do
@@ -38,6 +42,19 @@ start from file (key, _) = autoCopiesDrop file key (>) $ \numcopies ->
 			if Remote.uuid remote == u
 				then startLocal file numcopies key
 				else startRemote file numcopies key remote
+	where
+		{- In --auto mode, drop if there are enough copies,
+		 - and the repository being dropped from doesn't prefer
+		 - to keep the content. -}
+		shouldDrop a = autoCopiesWith file key (>) $ \numcopies ->
+			ifM (Annex.getState Annex.auto)
+				( do
+					fp <- inRepo $ toTopFilePath file
+					u <- maybe getUUID (return . Remote.uuid) from
+					ifM (isPreferredContent (Just u) (S.singleton u) fp)
+						( a numcopies, stop )
+				, a numcopies
+				)
 
 startLocal :: FilePath -> Maybe Int -> Key -> CommandStart
 startLocal file numcopies key = stopUnless (inAnnex key) $ do

debian/changelog

@@ -10,8 +10,8 @@ git-annex (3.20121002) UNRELEASED; urgency=low
   * Added preferred content expressions, configurable using vicfg.
   * get --auto, copy --auto: If the local repository has preferred content
     configured, only get that content.
-  * drop --auto: If the local repository has preferred content configured,
+  * drop --auto: If the repository the content is dropped from has
-    drop content that is not preferred, when numcopies allows.
+    preferred content configured, drop only content that is not preferred.
   * --copies=group:number can now be used to match files that are present
     in a specified number of repositories in a group.
   * Added --smallerthan, --largerthan, and --inall limits.