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Bug#1030586: lintian: Testsuite failure on some systems: 1h time offset in test ancient-source

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Hi Russ,

Russ Allbery wrote:
> > # -ancient-source (source): unpack-message-for-source tar: ancient-source-1.0/README: implausibly old time stamp 1969-12-31 23:59:59
> > # +ancient-source (source): unpack-message-for-source tar: ancient-source-1.0/README: implausibly old time stamp 1970-01-01 00:59:59
> 
> The exactly one hour difference makes me suspicious something is going on
> with time zone conversions.  That's also consistent with the one hour time
> difference between UTC and Europe/Zurich at New Years.
> 
> Looking at the source of tar, the output timestamp for this error seems to
> be in local time by default, which would certainly explain the problem but
> not why we're not seeing it everywhere.  I would be curious if it went
> away if you added --utc to the flags to tar in
> Lintian::IO::Select::unpack_and_index_piped_tar

Nice idea! Will definitely try.

> or (bigger hammer) just set TZ=UTC when running Lintian.

I tried with TZ=GMT. I also tried TZ=UTC, but that had no effect. I
think you need to use TZ=Etc/UTC there instead.

> Lintian should probably force all output it controls to UTC for
> reproducibility, including tar's, but I'm still mystified as to why it
> works on the other system.  This part of tar doesn't seem to have changed,
> and as you mentioned replacing tar didn't change anything.

Exactly. All of that. :-)

		Regards, Axel
-- 
 ,''`.  |  Axel Beckert <abe@debian.org>, https://people.debian.org/~abe/
: :' :  |  Debian Developer, ftp.ch.debian.org Admin
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Bug#1030586: lintian: Testsuite failure on some systems: 1h time offset in test ancient-source Axel Beckert <abe@debian.org> - 2023-02-05 12:50 +0100
  Bug#1030586: lintian: Testsuite failure on some systems: 1h time offset in test ancient-source Russ Allbery <rra@debian.org> - 2023-02-05 18:10 +0100
    Bug#1030586: lintian: Testsuite failure on some systems: 1h time offset in test ancient-source Axel Beckert <abe@debian.org> - 2023-02-05 22:10 +0100
  Bug#1030586: lintian: Testsuite failure on some systems: 1h time offset in test ancient-source Vagrant Cascadian <vagrant@reproducible-builds.org> - 2023-02-05 21:40 +0100
    Bug#1030586: lintian: Testsuite failure on some systems: 1h time offset in test ancient-source Axel Beckert <abe@debian.org> - 2023-02-05 22:10 +0100

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