From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Sixt <j.sixt@viscovery.net>
Subject: Re: [PATCH v2] am: gather GIT_AUTHOR_* from original commit when
 rebasing
Date: Wed, 16 Jun 2010 08:30:53 +0200
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References: <1276641564-2074-1-git-send-email-jaysoffian@gmail.com>
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Cc: git@vger.kernel.org, Junio C Hamano <junio@kernel.org>
To: Jay Soffian <jaysoffian@gmail.com>
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Am 6/16/2010 0:39, schrieb Jay Soffian:
> +	if test -f "$dotest/original-commit"
> +	then
> +		original_commit="$(cat "$dotest/original-commit")"
> +		GIT_AUTHOR_NAME="$(GIT_PAGER='' git log --format=%an -1 "$original_commit")"
> +		GIT_AUTHOR_EMAIL="$(GIT_PAGER='' git log --format=%ae -1 "$original_commit")"
> +		GIT_AUTHOR_DATE="$(GIT_PAGER='' git log --format=%aD -1 "$original_commit")"

I think you can use the function get_author_ident_from_commit() for this.
See git-sh-setup.

-- Hannes