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From: Taylor Blau <me@ttaylorr.com>
To: Denton Liu <liu.denton@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>,
	"brian m . carlson" <sandals@crustytoothpaste.net>
Subject: Re: [PATCH 2/4] builtin/rev-parse: learn --null-oid
Date: Fri, 18 Sep 2020 10:11:25 -0400	[thread overview]
Message-ID: <20200918141125.GB1602321@nand.local> (raw)
In-Reply-To: <004f2e4c92918a7a4e452d49e98ef15f1c5ac545.1600427894.git.liu.denton@gmail.com>

Hi Denton,

On Fri, Sep 18, 2020 at 04:19:03AM -0700, Denton Liu wrote:
> When a user needed the null OID for scripting purposes, it used to be
> very easy: hardcode 40 zeros. However, since Git started supporting
> SHA-256, this assumption became false which may break some scripts.
> Allow users to fix their broken scripts by providing users with a
> hash-agnostic method of obtaining the null OID.

I have not been very involved in the hash transition, so please take my
comments with a grain of salt (and if they are misplaced, feel free to
ignore them).

This '--null-oid' thing makes me wonder exactly what it does. Yours
gives a type-less object back, but what about scripts that want the OID
of the empty blob or tree?

Would having something like '--null-oid[=<type>]' be useful for them? On
the one hand, it seems like a thing that would be useful, but on the
other, those aren't *the* null OID when 'type' is 'blob' or 'tree'. A
more appropriate name in that case might be '--empty-oid=tree'.

So, that's an argument that '--null-oid' and '--empty-oid[=<type>]'
should be two distinct things. I think I like that best. Do you have any
thoughts about it?

Thanks,
Taylor

  reply	other threads:[~2020-09-18 14:11 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-18 11:19 [PATCH 0/4] sample hooks: become hash agnostic Denton Liu
2020-09-18 11:19 ` [PATCH 1/4] hooks--pre-push.sample: prefer $() for command substitution Denton Liu
2020-09-18 16:57   ` Eric Sunshine
2020-09-18 11:19 ` [PATCH 2/4] builtin/rev-parse: learn --null-oid Denton Liu
2020-09-18 14:11   ` Taylor Blau [this message]
2020-09-18 14:16     ` Taylor Blau
2020-09-18 18:16       ` Junio C Hamano
2020-09-18 18:21         ` Taylor Blau
2020-09-18 21:26     ` brian m. carlson
2020-09-20  4:25       ` Chris Torek
2020-09-20 18:58         ` brian m. carlson
2020-09-20 15:35       ` Taylor Blau
2020-09-20 16:03       ` Andreas Schwab
2020-09-18 11:19 ` [PATCH 3/4] hooks--pre-push.sample: use hash-agnostic null OID Denton Liu
2020-09-18 17:06   ` Eric Sunshine
2020-09-18 11:19 ` [PATCH 4/4] hooks--update.sample: " Denton Liu
2020-09-18 17:08   ` Eric Sunshine
2020-09-18 21:35 ` [PATCH 0/4] sample hooks: become hash agnostic brian m. carlson
2020-09-23  9:38 ` [PATCH v2 0/3] " Denton Liu
2020-09-23  9:38   ` [PATCH v2 1/3] hooks--pre-push.sample: modernize script Denton Liu
2020-09-23  9:38   ` [PATCH v2 2/3] hooks--pre-push.sample: use hash-agnostic zero OID Denton Liu
2020-09-23  9:38   ` [PATCH v2 3/3] hooks--update.sample: " Denton Liu
2020-09-23 16:34   ` [PATCH v2 0/3] sample hooks: become hash agnostic Junio C Hamano

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