Sparse repositories and fclone/fpull

[Brad Wetmore]

One of the Mercurial assumptions a few of us (Tim/Kelly/I) have been 
working under is that we can use "partial trees" for our builds/tests. 
For example, for my gatekeeping, I want to build most things, but not 
hotspot and some of the closed repositories (install).

So I fclone'd openjdk, then deleted hotspot.  Watch the fpull:

% \rm -rf hotspot
% hg fpull
[.]
pulling from http://hg.openjdk.java.net/jdk7/tl/
searching for changes
no changes found

[corba]
pulling from http://hg.openjdk.java.net/jdk7/tl/corba
searching for changes
no changes found

[hotspot]
requesting all changes
adding changesets
adding manifests
adding file changes
added 6 changesets with 2899 changes to 2896 files

...deleted...

Yep, the subrepository I deleted was recreated...sigh...looks like I 
have to keep everything around, or else clone each subrepository separately.

So, is there an option to only update the subrepositories that are present?

Brad