Comment 2 for bug 717937

Chatting on IRC the problem is basically that sprout now executes graph searches itself (via FetchSpecFactory), whereas before that was delegated to the fetch implementation.

So I think we need to revisit the design decision to restrict the fetch_spec param of fetch to implementations of AbstractSearchResult: bzr-hg and bzr-git clearly want to have some control over how Searches turned into fetches. In particular, I don't think they want to go via a SearchResult; determining what to fetch given a query is delegated to the underlying git/hg libraries.

Jelmer also points out that we could perhaps move some of the new logic onto interrepo.