[Reproducible-builds] Bug#819726: ckbuilder: please use SOURCE_DATE_EPOCH for copyright notices and build timestamp

[boyska]

Package: ckbuilder
Version: 2.3.0+dfsg-2
Severity: normal
User: reproducible-builds at lists.alioth.debian.org
Usertags: toolchain timestamps

Hi,

While working on the “reproducible builds” effort [1], we have noticed
that ckbuilder embeds the build time in two places: copyrigh headers on the
built javascript files, and a ".options.timestamp" field in the generated code
itself. This behaviour make packages generated by ckbuilder (ie: ckeditor)
unreproducible.

The attached patch fixes this behaviour honoring the SOURCE_DATE_EPOCH [2]
environment variable.

[1] https://wiki.debian.org/ReproducibleBuilds
[2] https://reproducible-builds.org/specs/source-date-epoch/
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