RFR: 8276766: Enable jar and jmod to produce deterministic timestamped content [v20]

[Alan Bateman]

On Mon, 6 Dec 2021 19:11:45 GMT, Andrew Leonard <aleonard at openjdk.org> wrote:

>> Add a new --source-date <TIMESTAMP> (epoch seconds) option to jar and jmod to allow specification of time to use for created/updated jar/jmod entries. This then allows the ability to make the content deterministic.
>> 
>> Signed-off-by: Andrew Leonard <anleonar at redhat.com>
>
> Andrew Leonard has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8276766: Enable jar and jmod to produce deterministic timestamped content
>   
>   Signed-off-by: Andrew Leonard <anleonar at redhat.com>

I've edited the CSR to make the summary a bit simpler. I've also removed some of text from the Solution section as the discussion about SOURCE_DATE_EPOCH being an issue due to the security manager was confusing.  I also removed the sentence about tools not supporting -Dname=value as it's not quite right as it can be done with -J-Dname=value. Please read over to make sure you are okay with the edits.

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PR: https://git.openjdk.java.net/jdk/pull/6481