ZipArchiver.setUpdateMode() doesn't work

[rfscholte]

I did a quick scan and it seems like there's a copy created (renamedFile), but the content is never added to the destFile. And afterwards the renamedFile is deleted, leaving behind only the destFile with the newly added files.

[plamentotev]

This is the behavior indeed - a new zip file is created with the new content added and the old one is simply discarded. I've created a simple test case that reproduces the issue.

Do you have an idea how update mode is supposed to work? I guess the same way as the other zip programs - new files are added and existing files replace the ones in the original archive only if they are newer.