From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Bash <bash@genarts.com>
Subject: Re: Tags, Grafts, and Clones, oh my!
Date: Fri, 20 Aug 2010 09:00:20 -0400 (EDT)
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To: Ramkumar Ramachandra <artagnon@gmail.com>
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> >
> >    error: refs/tags/tagFoo does not point to a valid object!
> >
> 
> It seems too vague to me. Can you submit your testcase? Perhaps we can
> work from there?

Sure:

mkdir gitTagBug
cd gitTagBug

git init foo
cd foo
echo A >> foo.txt
git add foo.txt
git commit -m "Created foo"
GRAFT_PARENT=`git rev-parse master`
echo B >> foo.txt
git commit -am "Added B"
cd ..

git init bar
cd bar
echo A >> foo.txt
echo C >> foo.txt
git add foo.txt
git commit -m "Added C"
GRAFT_CHILD=`git rev-parse master`
git tag -am "Tagging foo C" tagFoo $GRAFT_CHILD
cd ..

cd foo
git fetch ../bar refs/tags/tagFoo:refs/tags/tagFoo
echo "$GRAFT_CHILD $GRAFT_PARENT" >> .git/info/grafts
git filter-branch --tag-name-filter cat tagFoo
cd ..

# Purposely use a file URL to prune any unreferenced objects
git clone file:///`pwd`/foo newFoo

My output from the clone:

   Cloning into newFoo...
   remote: Counting objects: 9, done.
   remote: Compressing objects: 100% (3/3), done.
   remote: Total 9 (delta 0), reused 0 (delta 0)
   Receiving objects: 100% (9/9), done.
   error: refs/tags/tagFoo does not point to a valid object!

Thanks,
Stephen