From nobody Tue Jun  3 05:09:32 2025
X-Original-To: freebsd-current@mlmmj.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
	by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4bBJft4Qqxz5y2LH
	for <freebsd-current@mlmmj.nyi.freebsd.org>; Tue, 03 Jun 2025 05:09:42 +0000 (UTC)
	(envelope-from jamie@catflap.org)
Received: from donotpassgo.dyslexicfish.net (donotpassgo.dyslexicfish.net [IPv6:2001:19f0:7400:8808:12:4:0:1])
	by mx1.freebsd.org (Postfix) with ESMTP id 4bBJft01Bdz3Jw8
	for <freebsd-current@FreeBSD.org>; Tue, 03 Jun 2025 05:09:41 +0000 (UTC)
	(envelope-from jamie@catflap.org)
Authentication-Results: mx1.freebsd.org;
	none
X-Catflap-Envelope-From: <jamie@donotpassgo.dyslexicfish.net>
X-Catflap-Envelope-To: freebsd-current@FreeBSD.org
Received: from donotpassgo.dyslexicfish.net (donotpassgo.dyslexicfish.net [209.250.224.51])
	by donotpassgo.dyslexicfish.net (8.14.5/8.14.5) with ESMTP id 55359Xxk093263;
	Tue, 3 Jun 2025 06:09:33 +0100 (BST)
	(envelope-from jamie@donotpassgo.dyslexicfish.net)
Received: (from jamie@localhost)
	by donotpassgo.dyslexicfish.net (8.14.5/8.14.5/Submit) id 55359WbR093262;
	Tue, 3 Jun 2025 06:09:32 +0100 (BST)
	(envelope-from jamie)
From: Jamie Landeg-Jones <jamie@catflap.org>
Message-Id: <202506030509.55359WbR093262@donotpassgo.dyslexicfish.net>
Date: Tue, 03 Jun 2025 06:09:32 +0100
Organization: Dyslexic Fish
To: sgk@troutmask.apl.washington.edu, freebsd-current@FreeBSD.org
Subject: Re: drm panic after new world
References: <aDi-PhLtvicg9Bbz@troutmask.apl.washington.edu>
 <aDjThAnfAfJB4KE7@troutmask.apl.washington.edu>
 <aD4nRhiexw1m7iUS@troutmask.apl.washington.edu>
In-Reply-To: <aD4nRhiexw1m7iUS@troutmask.apl.washington.edu>
User-Agent: Heirloom mailx 12.4 7/29/08
List-Id: Discussions about the use of FreeBSD-current <freebsd-current.freebsd.org>
List-Archive: https://lists.freebsd.org/archives/freebsd-current
List-Help: <mailto:freebsd-current+help@freebsd.org>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Subscribe: <mailto:freebsd-current+subscribe@freebsd.org>
List-Unsubscribe: <mailto:freebsd-current+unsubscribe@freebsd.org>
Sender: owner-freebsd-current@FreeBSD.org
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.7 (donotpassgo.dyslexicfish.net [209.250.224.51]); Tue, 03 Jun 2025 06:09:33 +0100 (BST)
X-Rspamd-Queue-Id: 4bBJft01Bdz3Jw8
X-Spamd-Bar: ----
X-Rspamd-Pre-Result: action=no action;
	module=replies;
	Message is reply to one we originated
X-Spamd-Result: default: False [-4.00 / 15.00];
	REPLY(-4.00)[];
	ASN(0.00)[asn:20473, ipnet:2001:19f0:7400::/38, country:US]

> How does one use dates to checkout a particular head?
> If I'm at the top of HEAD and need to got back to
> mid-february, what's the easiest option for performing
> a bisection by hand?

git rev-list -1 main '--before=2025-02-17'

This will give you the hash of the latest commit before the specified
date.

I'd use a little script something like this:

#!/bin/sh

[ -d src/.git ] || git clone --single-branch https://git.freebsd.org/src.git
cd src || exit 1
commit="$(git rev-list -1 main --before="$1")"
git checkout "$commit"

Then if you call it (say) gitbydate, you can use:

gitbydate 2025-02-17
gitbydate 2025-02-12

etc...

Cheers, Jamie