Weirdness with port-update hook and local push

I have the following post-update hook:

-----
#!/bin/sh

unset GIT_DIR
cd /home/barkalow/auto-working/web
if ! git pull /home/barkalow/git/web.git/
then
  exit 1  
fi
make
-----

From that "git pull", I'm getting:

/home/barkalow/bin/git-pull: line 108: 30608 Broken pipe      git-merge $no_summary $no_commit $strategy_args "$merge_name" HEAD $merge_head

It works fine when pushing over ssh, and when I just run the hook 
directly. (It does a fast forward merge without any trouble.) Any ideas on 
what's confusing it?

	-Daniel
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