safer inannex checking

git-annex-shell inannex now returns always 0, 1, or 100 (the last when
it's unclear if content is currently in the index due to it currently being
moved or dropped).

(Actual locking code still not yet written.)

Command/Drop.hs

@@ -52,7 +52,7 @@ startRemote file numcopies key remote = do
 	next $ performRemote key numcopies remote
 
 performLocal :: Key -> Maybe Int -> CommandPerform
-performLocal key numcopies = lockExclusive key $ do
+performLocal key numcopies = lockContent key $ do
 	(remotes, trusteduuids) <- Remote.keyPossibilitiesTrusted key
 	untrusteduuids <- trustGet UnTrusted
 	let tocheck = Remote.remotesWithoutUUID remotes (trusteduuids++untrusteduuids)
@@ -64,7 +64,7 @@ performLocal key numcopies = lockExclusive key $ do
 		else stop
 
 performRemote :: Key -> Maybe Int -> Remote.Remote Annex -> CommandPerform
-performRemote key numcopies remote = lockExclusive key $ do
+performRemote key numcopies remote = lockContent key $ do
 	-- Filter the remote it's being dropped from out of the lists of
 	-- places assumed to have the key, and places to check.
 	-- When the local repo has the key, that's one additional copy.
@@ -95,7 +95,7 @@ cleanupRemote key remote ok = do
 	-- better safe than sorry: assume the remote dropped the key
 	-- even if it seemed to fail; the failure could have occurred
 	-- after it really dropped it
-	Remote.remoteHasKey remote key False
+	Remote.logStatus remote key False
 	return ok
 
 {- Checks specified remotes to verify that enough copies of a key exist to

Command/InAnnex.hs

@@ -19,8 +19,9 @@ seek :: [CommandSeek]
 seek = [withKeys start]
 
 start :: Key -> CommandStart
-start key = do
-	present <- inAnnex key
-	if present
-		then stop
-		else liftIO exitFailure
+start key = inAnnexSafe key >>= dispatch
+	where
+		dispatch (Just True) = stop
+		dispatch (Just False) = exit 1
+		dispatch Nothing = exit 100
+		exit n = liftIO $ exitWith $ ExitFailure n

Command/Move.hs

@@ -82,7 +82,7 @@ toPerform dest move key = moveLock move key $ do
 		else Remote.hasKey dest key
 	case isthere of
 		Left err -> do
-			showNote $ show err
+			showNote $ err
 			stop
 		Right False -> do
 			showAction $ "to " ++ Remote.name dest
@@ -96,7 +96,7 @@ toPerform dest move key = moveLock move key $ do
 		Right True -> finish
 	where
 		finish = do
-			Remote.remoteHasKey dest key True
+			Remote.logStatus dest key True
 			if move
 				then do
 					whenM (inAnnex key) $ removeAnnex key
@@ -137,5 +137,5 @@ fromPerform src move key = moveLock move key $ do
 {- Locks a key in order for it to be moved.
  - No lock is needed when a key is being copied. -}
 moveLock :: Bool -> Key -> Annex a -> Annex a
-moveLock True key a = lockExclusive key a
+moveLock True key a = lockContent key a
 moveLock False _ a = a