record transfers for git-annex-shell

Not yet tested and places git-annex-shell is run need to be modified to
pass the new field settings.

Note that rsyncServerSend was changed to fork, rather than directly exec
rsync, because it needs to keep the transfer lock held, and clean up the
transfer log when done.

Command/RecvKey.hs

@@ -12,6 +12,7 @@ import Command
 import CmdLine
 import Annex.Content
 import Utility.RsyncFile
+import Logs.Transfer
 
 def :: [Command]
 def = [oneShot $ command "recvkey" paramKey seek
@@ -21,14 +22,15 @@ seek :: [CommandSeek]
 seek = [withKeys start]
 
 start :: Key -> CommandStart
-start key = do
-	whenM (inAnnex key) $ error "key is already present in annex"
-	
-	ok <- getViaTmp key (liftIO . rsyncServerReceive)
-	if ok
-		then do
-			-- forcibly quit after receiving one key,
-			-- and shutdown cleanly
-			_ <- shutdown True
-			liftIO exitSuccess
-		else liftIO exitFailure
+start key = ifM (inAnnex key)
+	( error "key is already present in annex"
+	, fieldTransfer Download key $ do
+		ifM (getViaTmp key $ liftIO . rsyncServerReceive)
+			( do
+				-- forcibly quit after receiving one key,
+				-- and shutdown cleanly
+				_ <- shutdown True
+				liftIO exitSuccess
+			, liftIO exitFailure
+			)
+	)