[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4946 Omit (or

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[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4946 Omit (or set manually) PDF Metadata to have byte-for-byte reproducible buil; ds

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Wed, 27 Jul 2016 13:49:19 +0000

I am skeptical that ModDate and CreationDate being optional by spec will buy us anything since LilyPond is not writing its PDF files itself and I would suspect ps2pdf to fill in those entries when nobody else does.

[issues:#4946] Omit (or set manually) PDF Metadata to have byte-for-byte reproducible buil;ds

Status: New
Created: Wed Jul 27, 2016 01:42 PM UTC by pkx166h
Last Updated: Wed Jul 27, 2016 01:42 PM UTC
Owner: nobody

On 26/07/16 21:25, Graham Percival wrote:

It would be nice if we could have byte-for-byte "reproducible" builds; i.e.
if the input file and the lilypond versions are the same, they would produce
identical output.

Currently we can set pdfmodDate, but the PDF metadata "CreationData" field
is still set to the current time. It would be great if we could either omit
that field, or set it manually.

Test case: compile this twice (keeping the first pdf), then compare the
files. Ideally they would produce identical output.

\version "2.19.45"
\header {
% Works great!
pdfmodDate = "D:20150811160000+01'00'"
% Doesn't change anything; not currently supported.
pdfcreationDate = "D:20150811160000+01'00'"
}
{ c'4 }

I will note that both ModDate and CreationDate are optional in the PDF spec
(according to David):
https://lists.gnu.org/archive/html/lilypond-user/2016-07/msg00162.html

Cheers,
- Graham

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