update

doc/todo/compute_special_remote_remaining_todos.mdwn

@@ -18,8 +18,15 @@ compute special remote. --[[Joey]]
 * would be nice to have a way to see what computations are used by a
   compute remote for a file. Put it in `whereis` output? But it's not an
   url. Maybe a separate command? That would also allow querying for eg,
-  what files are inputs for another file. Or it could be exposed in the
+  what files are inputs for another file. 
-  Remote interface, and made into a file matching option.
+
+  Or it could be exposed in the
+  Remote interface, and made into a file matching option:
+
+  git-annex find --inputof=foo
+
+  But that would require running expensive find over the whole tree,
+  and wouldn't work if the input file is no longer in the tree.
 
 * allow git-annex enableremote with program= explicitly specified,
   without checking annex.security.allowed-compute-programs
@@ -43,3 +50,15 @@ compute special remote. --[[Joey]]
 
   Or it could build a DAG and traverse it, but building a DAG of a large
   directory tree has its own problems.
+
+* Should checkPresent check that each input file is also present in some
+  (non-dead) repo?
+
+  Currently it only checks if compute state is recorded. The problem
+  this additional checking would solve is if an input file gets lost,
+  then a computation cannot be run again.
+
+  Should it be an active check against existing remotes, or a
+  passive check? An active check certainly makes sense if the input
+  file is itself present in a compute repo, either the same one or a
+  different one. Otherwise, a passive check seems enough.