[Rpm-maint] [rpm-software-management/rpm] rpm --rebuilddb in an overlayfs without redirect_dir=on (Discussion #2905)

[th-hummel]

Well, I'm no expert either but my understanding is that for instance a tool like `mv` would first try `rename()` and if it returns `EXDEV` it will workaround by copying data.

So, to me the main difference is the atomicity: when you set an `xattr` to the orignal dir then `rename()` the copied up dir, though this means 2 actions, the `rename()` is atomic since no data is actually copied.
My understanding is that such actions are somehow "prepared" in the `workdir`.

I don't know if in the` rpm --rebuilddb` you need this atomicity or not but that would be the first question to be answered I think ?

Thanks for your help

-- 
Thomas HUMMEL

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