From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 10 Aug 2020 15:22:59 GMT
Subject: Re: [PATCH v2] test_cmp: diagnose incorrect arguments
Message-ID: <xmqqtuxacyp8.fsf@gitster.c.googlers.com>
In-Reply-To: <CAPig+cTA_BVz-bGcGY++g2RV-Zd3Gv_yTGjv=VeMeqhP4eZZrw@mail.gmail.com>

Eric Sunshine <sunshine@sunshineco.com> writes:

> I had the same concern that it didn't necessarily make sense to allow
> "-" for $2, but eventually thought of a case such as:
>
>     sed '...' actual | test_cmp expect - &&
>
> which massages 'actual' before test_cmp() sees it. True, we don't
> actually have such callers, but it theoretically is legitimate.

Yup, that looks a bit too stretching [*] to me, but that was what I
had in mind when I said "I'll let it pass".

    Side note.  Presumably that 'actual' was written by Git, to
    avoid losing its exit code, e.g.

	git frotz >actual &&
	sed '...' actual | test_cmp expect -

    but then it becomes more natural to write the second one like
    so:

	git frotz >raw &&
	sed '...' raw >actual &&
	test_cmp expect actual