From: Junio C Hamano <gitster@pobox.com>
Date: Thu, 01 Sep 2016 22:59:03 GMT
Subject: Re: [PATCH 13/22] sequencer: remember the onelines when parsing the todo file
Message-ID: <xmqqvayftefc.fsf@gitster.mtv.corp.google.com>
In-Reply-To: <63004be3-04de-00c5-a94d-1b600201bc6f@gmail.com>

Jakub Narębski <jnareb@gmail.com> writes:

> I wonder how probable is situation where we save instruction sheet
> for interactive rebase, with shortened SHA-1, and during rebase
> shortened SHA-1 stops being unambiguous...

It is my understanding that the shortened ones are only for end-user
consumption.  The insn sheet internally uses fully expanded form for
this exact reason, and then abbreviated back at each step before the
updated one is presented to the end-user.  Uniqueness guarantee is
enforced with new objects created during each step taken into
account by doing it this way.