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

[Sebastiaan Couwenberg]

Control: tags -1 moreinfo

On 5/8/23 02:07, Vagrant Cascadian wrote:
> The attached patch fixes this by not touching these files during the
> build process.

 From shar(1):

"
   -m, --no-timestamp
          do not restore modification times.

          Avoid generating 'touch' commands to restore the file
          modification dates when unpacking files from the archive.

          When file modification times are not preserved, project build
          programs like "make" will see built files older than the files
          they get built from.  This is why, when this option is not
          used, a special effort is made to restore timestamps.
"

That should be used when generating the archives instead of your patch 
to not have the mtimes touched when unpacking the archives.

But the diffoscope-results only show a few of the files from the shar 
archives with different mtimes, and all of them get touched when 
unpacking the archive just before the configure target is executed.

shar actually makes the timestamps reproducible by always using the 
mtime recorded in the archive instead of the time the files were unpacked.

Something else is likely changing the mtime after the files are 
unpacked. Some of these grids are used by the testsuite for example.

Kind Regards,

Bas

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