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Re: Tar doesn't handle short reads

From: Paul Eggert
Subject: Re: Tar doesn't handle short reads
Date: Thu, 30 Jul 2020 12:13:00 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 7/29/20 1:31 AM, Dominique Martinet wrote:

But we do stat before, and have that race condition already, because of
the 0-blocks sparse file optimization at least ?

I didn't know that, but if that's the case that's a race that should also be 

even if the file is regular, it can legitimately be interrupted by a

Sure, but if the program has no signal handler that returns, then the program should never get a short read on a regular file. At least, that's the longstanding tradition and I expect that's why POSIX says 'read' should do that.

Well; I don't know. I'm open to discussion on how to improve 9p as well
in parallel, but I think the safe approach would be to work on both.

Yes, probably 'tar' should be modified to deal with this glitch, if someone gets the time to do that.

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