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I suspect you're looking for pristine-tar(1)?

https://manpages.debian.org/stretch/pristine-tar/pristine-ta...

It's intended to solve exactly this problem, but in reverse -- a tarball is extracted to source, and we want to ensure that the sources we've extraced can be traced back to the original tarball.

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Hum, that is interesting. I'm more thinking that in a perfect world the pristine-tar delta file should be empty. (Assuming I understand what pristine-tar is doing correctly).

For example I tend to use SOURCE_DATE_EPOCH to be the timestamp of the commit to make sure that anything that embed time is reproducible without extra instruction/manual process specific file.

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