Preupdate hook

[Peter Kronenberg]

I've written a preupdate hook to disallow 'backward' merges.  The problem
I'm having is that it is also called for grafts and I don't want to
disallow grafts.  Is there a way I can tell in the hook which command
initiated it?
I also tried looking for the .hg/graftstate file, but that seems to be
created only after the preupdate hook is called.

Any help would be appreciated.

thanks
Peter
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