RFR: 8352689: Allow for hash sum overrides when linking from the run-time image [v2]

[Christoph Langer]

On Wed, 26 Mar 2025 14:50:11 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> > I'll keep looking into this specific case. However, it sounds a bit orthogonal to the patch at hand which I do believe we still need for the original reasons mentioned (RPM changing binaries after the JDK build is long done and the windows issue of the JDK build itself placing different *.pdb files into the image than was present at jlink time). So perhaps we should explore this in parallel?
> 
> I think upgradable files is something we can deal with. I'm not sure yet on the PDB issue, need to think more about about the scenarios to see what might make sense.

So the suggestion would be that we could mark some files as upgradable which would exclude them from SHA checking? Or, check the sha but accept a diff while printing a warning?

Would it maybe make sense/be possible to offer some re-hash functionality for using in 2nd step builds?

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PR Comment: https://git.openjdk.org/jdk/pull/24190#issuecomment-2755284227