Sorry for not responding to this in my previous reply.

On Wed, 2021-04-14 at 15:29 +0000, Zbigniew Jędrzejewski-Szmek wrote:
> I wanted to investigate this, but unfortunately, it's hard to check
> right now, because all builds are non-reproducible (in the sense of
> reproducible-builds.org), because we include the mtime of build
> products in rpm metadata, so pretty much all binary rpms are
> different. 

I'm thinking this isn't that important. In most current RPMs, the
mtimes for files are in two places:

1. In the (main) rpm header
2. in the cpio header for the file in the payload.

I can talk about the effect on RPMCow: the mtime isn't part of the
identity of the file - it's just a content hash. When the files are
actually installed, then the resulting inode is touch'ed to the right
time. Therefore I think it's moot (MOOt?) from a CoW perspective, the
reuse can happen.

Matthew.
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