make copy --to check preferred content of the remote

Annex/Wanted.hs

@@ -0,0 +1,50 @@
+{- git-annex control over whether content is wanted
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Annex.Wanted where
+
+import Common.Annex
+import qualified Remote
+import Annex.Content
+import Logs.PreferredContent
+import Git.FilePath
+import qualified Annex
+import Annex.UUID
+
+import qualified Data.Set as S
+
+checkAuto :: (Bool -> Annex Bool) -> Annex Bool
+checkAuto a = Annex.getState Annex.auto >>= a
+
+{- A file's content should be gotten if it's not already present.
+ - In auto mode, only get files that are preferred content. -}
+shouldGet :: FilePath -> Key -> Bool -> Annex Bool
+shouldGet file key auto = (not <$> inAnnex key) <&&> want
+	where
+		want
+			| auto = do
+				fp <- inRepo $ toTopFilePath file
+				isPreferredContent Nothing S.empty fp
+			| otherwise = return True
+
+{- A file's content should be sent to a remote.
+ - In auto mode, only send files that are preferred content of the remote. -}
+shouldSend :: Remote -> FilePath -> Bool -> Annex Bool
+shouldSend _ _ False = return True
+shouldSend to file True = do
+	fp <- inRepo $ toTopFilePath file
+	isPreferredContent (Just $ Remote.uuid to) S.empty fp
+
+{- A file's content should be dropped normally.
+ - (This does not check numcopies though.)
+ - In auto mode, hold on to preferred content. -}
+shouldDrop :: Maybe Remote -> FilePath -> Bool -> Annex Bool
+shouldDrop _ _ False = return True
+shouldDrop from file True = do
+	fp <- inRepo $ toTopFilePath file
+	u <- maybe getUUID (return . Remote.uuid) from
+	isPreferredContent (Just u) (S.singleton u) fp

Command.hs

@@ -38,10 +38,6 @@ import Usage as ReExported
 import Logs.Trust
 import Config
 import Annex.CheckAttr
-import Logs.PreferredContent
-import Git.FilePath
-
-import qualified Data.Set as S
 
 {- Generates a normal command -}
 command :: String -> String -> [CommandSeek] -> String -> Command
@@ -127,12 +123,7 @@ autoCopies file key vs a = Annex.getState Annex.auto >>= go
 			numcopiesattr <- numCopies file
 			needed <- getNumCopies numcopiesattr
 			(_, have) <- trustPartition UnTrusted =<< Remote.keyLocations key
-			if length have `vs` needed
-				then do
-					fp <- inRepo $ toTopFilePath file
-					ifM (isPreferredContent Nothing S.empty fp)
-						( a, stop )
-				else stop
+			if length have `vs` needed then a else stop
 
 autoCopiesWith :: FilePath -> Key -> (Int -> Int -> Bool) -> (Maybe Int -> CommandStart) -> CommandStart
 autoCopiesWith file key vs a = do

Command/Copy.hs

@@ -11,6 +11,7 @@ import Common.Annex
 import Command
 import qualified Command.Move
 import qualified Remote
+import Annex.Wanted
 
 def :: [Command]
 def = [withOptions Command.Move.options $ command "copy" paramPaths seek
@@ -21,8 +22,14 @@ seek = [withField Command.Move.toOption Remote.byName $ \to ->
 		withField Command.Move.fromOption Remote.byName $ \from ->
 			withFilesInGit $ whenAnnexed $ start to from]
 
--- A copy is just a move that does not delete the source file.
--- However, --auto mode avoids unnecessary copies.
+{- A copy is just a move that does not delete the source file.
+ - However, --auto mode avoids unnecessary copies, and avoids getting or
+ - sending non-preferred content. -}
 start :: Maybe Remote -> Maybe Remote -> FilePath -> (Key, Backend) -> CommandStart
 start to from file (key, backend) = autoCopies file key (<) $
-	Command.Move.start to from False file (key, backend)
+	stopUnless shouldCopy $ 
+		Command.Move.start to from False file (key, backend)
+	where
+		shouldCopy = case to of
+			Nothing -> checkAuto $ shouldGet file key
+			Just r -> checkAuto $ shouldSend r file

Command/Drop.hs

@@ -17,10 +17,7 @@ import Logs.Trust
 import Annex.Content
 import Config
 import qualified Option
-import Git.FilePath
-import Logs.PreferredContent
-
-import qualified Data.Set as S
+import Annex.Wanted
 
 def :: [Command]
 def = [withOptions [fromOption] $ command "drop" paramPaths seek
@@ -34,27 +31,15 @@ seek = [withField fromOption Remote.byName $ \from ->
 	withFilesInGit $ whenAnnexed $ start from]
 
 start :: Maybe Remote -> FilePath -> (Key, Backend) -> CommandStart
-start from file (key, _) = shouldDrop $ \numcopies ->
-	case from of
-		Nothing -> startLocal file numcopies key
-		Just remote -> do
-			u <- getUUID
-			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
-				)
+start from file (key, _) = autoCopiesWith file key (>) $ \numcopies ->
+	stopUnless (checkAuto $ shouldDrop from file) $
+		case from of
+			Nothing -> startLocal file numcopies key
+			Just remote -> do
+				u <- getUUID
+				if Remote.uuid remote == u
+					then startLocal file numcopies key
+					else startRemote file numcopies key remote
 
 startLocal :: FilePath -> Maybe Int -> Key -> CommandStart
 startLocal file numcopies key = stopUnless (inAnnex key) $ do

Command/Get.hs

@@ -13,6 +13,7 @@ import qualified Remote
 import Annex.Content
 import qualified Command.Move
 import Logs.Transfer
+import Annex.Wanted
 
 def :: [Command]
 def = [withOptions [Command.Move.fromOption] $ command "get" paramPaths seek
@@ -23,7 +24,7 @@ seek = [withField Command.Move.fromOption Remote.byName $ \from ->
 	withFilesInGit $ whenAnnexed $ start from]
 
 start :: Maybe Remote -> FilePath -> (Key, Backend) -> CommandStart
-start from file (key, _) = stopUnless (not <$> inAnnex key) $
+start from file (key, _) = stopUnless (checkAuto $ shouldGet file key) $
 	autoCopies file key (<) $
 		case from of
 			Nothing -> go $ perform key file