Re: [PATCH v3 1/4] t5000: test tar files that overflow ustar headers

From: Junio C Hamano <gitster@pobox.com>
Date: Jun 24, 2016, 22:41 UTC
Message-ID: <xmqqk2hedxas.fsf@gitster.mtv.corp.google.com>
In-Reply-To: <20160624205858.GA23315@sigill.intra.peff.net>

Jeff King <peff@peff.net> writes:

> The difference in time between the two is measurable on my system, but
> it's only a few milliseconds (for 4096 bytes). So maybe it's not worth
> worrying about (though as a general technique, it does make me worry
> that it's easy to get wrong in a way that will fail racily).

Yeah, GNU dd has iflag=fullblock, but if we assume GNU, we can safely assume "head -c", so I do not think of a way to do this portably enough.

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