Re: F35 Change: Package information on ELF objects (System-Wide Change proposal)

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On Mon, 2021-04-12 at 15:46 -0400, Ben Cotton wrote:
> https://fedoraproject.org/wiki/Changes/Package_information_on_ELF_objects

Putting packaging info into a binary guarantees that each successive
package containing ELF binaries will not contain exactly the same
binaries, even if there are no changes.

Now, what I just wrote there is predicated on "reproducible builds"
where the same source (including deps, headers) and the same toolchain
produce the same output. This may or may not be a thing. My concern is
that we completely eliminate the possibility of binaries being
unchanged.

My concern centers around the Copy on Write (CoW) use case - when
packages are updated, some files changes, and some may stay the same.
Where they are the same, we can save I/O and possibly download time
long term.

My recommendation here is to (continue to?) log build ids, and resolve
remotely if you don't have an rpmdb to consult. Build ids are opaque
and meaningless to end users, but end users aren't the target. My
expectation is that any data collection around crashes needs to
aggregate, and build ids are good enough to identify packages, even
after the fact.

Matthew.
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