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Sender: Junio C Hamano <jch2355@gmail.com>
From:   Junio C Hamano <gitster@pobox.com>
To:     Jeff King <peff@peff.net>
Cc:     Jiang Xin <worldhello.net@gmail.com>,
        Taylor Blau <me@ttaylorr.com>, Git List <git@vger.kernel.org>,
        Kyle Zhao <kylezhao@tencent.com>,
        Jiang Xin <zhiyou.jx@alibaba-inc.com>
Subject: Re: [PATCH] t5516: fail to run in verbose mode
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Date:   Fri, 25 Nov 2022 13:58:55 +0900
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Jeff King <peff@peff.net> writes:

> One thing I'd worry about is buffering. One of the nice things about
> "-v" is that there is nothing between you and the running programs, so
> you are much less likely to be fooled about the order of events in the
> output. Or wondering why nothing is happening because real-time output
> seems to have stalled. But piping through "cat" may end up with weird
> pauses while it fills up a 4k buffer. Using stdbuf could help, but
> that's far from portable.

We could pipe to "dd bs=1 conv=fsync" (tongue-in-cheek---I think
conv=fsync is a GNU thing).