On Sun, 1 Aug 2021 at 23:31, Eyal Lebedinsky <fed...@eyal.emu.id.au> wrote:

>
> On 02/08/2021 08.53, Cameron Simpson wrote:
> > On 01Aug2021 08:40, George N. White III <gnw...@gmail.com> wrote:
> >> gzip can store the file date in the archive, and (per
> >> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=950519)
> >> supports dates from 1970-01-01 00:00:01 UTC through 2106-02-07 06:28:15
> >> UTC.  As the Debian
> >> bug report notes, gzip may be hitting a limit in the kernel or a
> library.
> >
> > Likely gzip has a fixed size binary field for the timestamp, which some
> > timestamp value from afio's data is exceeding.
> >
> > Can you use gzip's -n option?
> >
> >       -n, -‐no‐name     This option stops the filename and timestamp from
> >                         being stored in the output file.
> >
> > That might mangle dates on restore, depending on how afio does that.
> >
> > Cheers,
> > Cameron Simpson <c...@cskk.id.au>
>
> Took me a while but in the end I tracked down some of the files.
>
>         $ ls -l /usr/share/licenses/mdevctl/COPYING --full-time
>         -rw-r--r-- 1 root root 26530 1970-01-01 10:00:00.000000000 +1000
> /usr/share/licenses/mdevctl/COPYING
>
> And the proof
>         $ gzip -c /usr/share/licenses/mdevctl/COPYING >gzip-test.1.gz
>         gzip: /usr/share/licenses/mdevctl/COPYING: warning: file timestamp
> out of range for gzip format
>
> So I guess that some recent gzip or lib has an issue here. '>' vs '>='
> maybe?
>

Dragons hang out at edge cases.  How did
/usr/share/licenses/mdevctl/COPYING get that timestamp?    I have (Fedora
33):

~ % ls -l /usr/share/licenses/mdevctl/COPYING --full-time
-rw-r--r--. 1 root root 26530 2021-06-10 13:49:09.000000000 -0300
/usr/share/licenses/mdevctl/COPYING

-- 
George N. White III
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