Re: [PATCH] Automake-git testsuite failures: aclocal9, acloca10, nodef

[Eric Blake]

Peter Breitenlohner <peb <at> mppmu.mpg.de> writes:

>   ~> touch -r file2 file3; cp -p file2 file4; ls -l --full-time file?
>   >  -rw-r--r-- 1 peb THEORY 6 2009-12-07 14:20:04.460965546 +0100 file1
>   >  -rw-r--r-- 1 peb THEORY 6 2009-12-07 14:20:04.964956156 +0100 file2
>   >  -rw-r--r-- 1 peb THEORY 0 2009-12-07 14:20:05.000000000 +0100 file3
>   >  -rw-r--r-- 1 peb THEORY 6 2009-12-07 14:20:05.000000000 +0100 file4
> As I knew already from trying to understand a similar problem, 'cp -p' and
> 'touch -r' both round sub-seconds, whereas tar and rsync truncate them.

Ouch.  When a timestamp can't be written to full precision, POSIX requires 
truncation, not rounding.  Is this coreutils cp?  At any rate, we should report 
the bug that cp is rounding timestamps.

-- 
Eric Blake