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From: =?UTF-8?B?w4Z2YXIgQXJuZmrDtnLDsCBCamFybWFzb24=?= <avarab@gmail.com>
Subject: Re: Cutting history
Date: Sat, 10 Jul 2010 20:12:01 +0000
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On Sat, Jul 10, 2010 at 11:58, =C3=86var Arnfj=C3=B6r=C3=B0 Bjarmason <=
avarab@gmail.com> wrote:

> As for pruning old history, I thought this *should* work for pruning
> history older than 7 days (given that you dump daily):
>
> =C2=A0 =C2=A0git rebase --strategy=3Dbase --onto master~8 master~7
>
> But of course that deletes new commits. I need to freshen up on my
> rebase understanding. Maybe someone else on list knows how to do
> that. I thought git rebase --interactive might work, but I can't get
> it to display the root commit. Maybe you need git-filter-branch.

Thiago Macieira on #git provided the answer. You can do that with
grafts and git filter-branch. E.g. rewriting the history so that you
only have the 7 latest commits:

    git rev-list HEAD | sed '7q;d' > .git/info/grafts &&
    test -s .git/info/grafts &&
    git filter-branch -f HEAD