Reproducible PS/PDF output

[ghost]

Several software packages use matplotlib in their building process (mainly to produce PS or PDF documents). To make their build reproducible, it would be great to make matplotlib output reproducible.

To allow reproducible PS and PDF output:

• honour SOURCE_DATE_EPOCH for timestamps in PS and PDF files.
  See https://reproducible-builds.org/specs/source-date-epoch/
• get keys sorted so that hatch patterns, images and markers are included with
  a reproducible order in the PDF file. Another solution is to use sorted(six.iteritems(self.hatchPatterns)) in writeHatches (and similar ordering in writeImages and writeMarkers), but this consumes more memory.

This patch has been submitted in debian bug #827361

See also https://reproducible-builds.org/

[tacaswell]

This may conflict with #6427 which is currently merged to master.

attn @jkseppan

[ghost]

You're right I did not see that. #6427 corresponds to my sorted in pdfRepr. Should I adapt my patch and rebase to master?

[tacaswell]

Yes please.

Thanks for being flexible about this.

On Thu, Jun 16, 2016 at 12:12 PM JojoBoulix notifications@github.com
wrote:

You're right I did not see that. #6427
#6427 corresponds to my
sorted in pdfRepr. Should I adapt my patch and rebase to master?

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[ghost]

I don't know how to do that in the same pull request so I created a new one: #6597.

[tacaswell]

Thanks. You can not re-direct a PR like that, opening a new one is the only option.