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bug#7529: Bug#605639: deal better with different filesystem timestamp re

From: Jim Meyering
Subject: bug#7529: Bug#605639: deal better with different filesystem timestamp resolutions
Date: Sat, 04 Dec 2010 18:56:07 +0100

Paul Eggert wrote:

> On 12/03/10 02:03, Jim Meyering wrote:
>> Would you mind adding a "Bug fixes" entry for this
>> in coreutils' NEWS file?  It'd be nice to commit that
>> along with an update of the gnulib submodule to the latest.
> Sure, done, with this notice:
>   cp -u no longer does unnecessary copying merely because the source
>   has finer-grained time stamps than the destination.


>> As for a test, it shouldn't be too hard to create a root-only test
>> on linux/gnu systems, since _PC_TIMESTAMP_RESOLUTION is not defined.
>> Create two loop-mounted file systems of types that have the desired
>> difference in time stamp resolution, and run commands like Dan did.
> Hmm, well, I can see a lot going wrong with that, such as garbage in the
> mount table if the test is interrupted.  (Also, there's the little problem
> that I lack root access on the hosts that I do builds on these days: does
> that get me off the hook?  :-)

I didn't mean to make it sound like a requirement.
I was merely thinking aloud about how I might do it.

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