From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Sixt <j6t@kdbg.org>
Subject: Re: [PATCH] diff.c: Ensure "index $from..$to" line contains unambiguous SHA1s
Date: Sun, 30 May 2010 21:58:40 +0200
Message-ID: <201005302158.40314.j6t@kdbg.org>
References: <201005301537.18039.johan@herland.net>
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Cc: Junio C Hamano <gitster@pobox.com>, git@vger.kernel.org
To: Johan Herland <johan@herland.net>
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On Sonntag, 30. Mai 2010, Johan Herland wrote:
> +cat >expect_initial <<EOF
> +100644 blob 51d2738463ea4ca66f8691c91e33ce64b7d41bb1	foo
> +EOF
> +
> +cat >expect_update <<EOF
> +100644 blob 51d2738efb4ad8a1e40bed839ab8e116f0a15e47	foo
> +EOF
> +
> +test_expect_success 'setup' '
> +	echo 4827 > foo &&
...
> +	echo 11742 > foo &&

How the fscking hell did you find these two simple values that are an 
almost-SHA1-collision? It's easier to hit the jackpot!?!

-- Hannes