RFR: 8276400: openjdk image Jars, Zips and Jmods built from the same source are not reproducible

Fri Nov 5 11:45:17 UTC 2021

On Thu, 4 Nov 2021 20:56:45 GMT, Andrew Leonard <aleonard at openjdk.org> wrote:

> This PR enables reproducible Jars, Jmods and openjdk image zip files (eg.src.zip).
> It provides support for SOURCE_DATE_EPOCH for Jar, Jmod and underlying ZipOutputStream's.
> It fixes the following keys issues relating to reproducibility:
> - Jar and ZipOutputStream are not SOURCE_DATE_EPOCH aware
>   - Jar and ZipOutputStream now detect SOURCE_DATE_EPOCH environment setting
> - Jar and Jmod file content ordering was non-determinsitic
>   - Fixes to Jar and Jmod main's to ensure sorted classes content ordering
> - openjdk image zip file generation used "zip" which is non-determinsitic
>   - New openjdk build tool "GenerateZip" which produces the final determinsitic zip files as part of the build and also detects SOURCE_DATE_EPOCH
> 
> Signed-off-by: Andrew Leonard <anleonar at redhat.com>

(And we can easily make sure that we do that from the JDK build)

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PR: https://git.openjdk.java.net/jdk/pull/6268