Bug#1035704: proj: reproducible-builds: timezone-dependent timestamps in .gsb/.gtx files

[Vagrant Cascadian]

On 2023-05-29, Sebastiaan Couwenberg wrote:
> On 5/28/23 23:38, Vagrant Cascadian wrote:
>> That said, I think it really is the touch commands in debian/datumgrids*
>> as touch's timestamp modification is timezone dependent in many cases...
>> 
>> The attached patch fixes this by setting the TZ=UTC as an environment
>> variable in the debian/datumgrids*.shar files.
>> 
>> I also had success with a patch where the touch calls are done with
>> --date=${SOURCE_DATE_EPOCH} which also worked for me (as touch assumes
>> to be TZ=UTC in this case)... if that would be preferable, I can also
>> provide a patch for that.
>
> Patching the shar files is not ideal, when their content is modified 
> these changes will be lost.
>
> shar/unshar should be more likely be patched.
>
> Does TZ=UTC also work when set in the environment? If so, that could be 
> passed to the unshar commands in d/rules.

I would expect that to work as well, which I though of shortly after
sending the updated patch... though did not yet test it!

live well,
  vagrant
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