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