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.

Logs/Transfer.hs

@@ -10,6 +10,7 @@ module Logs.Transfer where
 import Common.Annex
 import Annex.Perms
 import Annex.Exception
+import qualified Annex
 import qualified Git
 import Types.Remote
 
@@ -54,6 +55,12 @@ upload u key file a = transfer (Transfer Upload u key) file a
 download :: UUID -> Key -> AssociatedFile -> Annex a -> Annex a
 download u key file a = transfer (Transfer Download u key) file a
 
+fieldTransfer :: Direction -> Key -> Annex a -> Annex a
+fieldTransfer direction key a = do
+	afile <- Annex.getField "associatedfile"
+	maybe a (\u -> transfer (Transfer direction (toUUID u) key) afile a)
+		=<< Annex.getField "remoteuuid"
+
 {- Runs a transfer action. Creates and locks the transfer information file
  - while the action is running. Will throw an error if the transfer is
  - already in progress.