From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 28 Mar 2013 14:55:43 GMT
Subject: Re: Bug in "git rev-parse --verify"
Message-ID: <7vtxnvwp3k.fsf@alter.siamese.dyndns.org>
In-Reply-To: <20130328140510.GB12898@sigill.intra.peff.net>

Jeff King <peff@peff.net> writes:

> On Thu, Mar 28, 2013 at 02:04:27PM +0100, Michael Haggerty wrote:
>
>> $ git rev-parse --verify 1111111111111111111111111111111111111111
>> 1111111111111111111111111111111111111111
>> $ echo $?
>> 0
>>
>> [...]
>>
>> I believe that "git rev-parse --verify" is meant to verify that the
>> argument is an actual object, and that it should reject fictional SHA1s.
>>  (If not then the documentation should be clarified.)  The same problem
>> also exists in 1.8.2 but I haven't checked how much older it is.
>
> I think it is only about verifying the name of the object. I.e., that
> you can resolve the argument to an object. It has always behaved this
> way; I even just tested with git v0.99.

Correct.  It is about "is it well formed and something we can turn
into 20-byte object name?" and nothing more.  It certainly does not
mean "do we have it?", as the function needs to be able to validate
something we do not yet have.