Re: F30: System-Wide Change proposal: DNF UUID

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On Mon, 7 Jan 2019 at 15:19, Lennart Poettering <mzerqung@xxxxxxxxxxx> wrote:
>
> On Mo, 07.01.19 13:32, Stephen John Smoogen (smooge@xxxxxxxxx) wrote:
>
> > On Mon, 7 Jan 2019 at 12:32, John Harris <johnmh@xxxxxxxxxxxxx> wrote:
> > >
> > > On Monday, January 7, 2019 11:34:47 AM EST Ben Cotton wrote:
> > > > The Fedora community cares about privacy and is adverse to tracking
> > > > measures. We don't want to track; just count.
> > >
> > > If this is ever implemented, we should probably notify end users and provide
> > > an easy way to disable this. If you pass an identifier, that enables client
> > > tracking.
> >
> > The original proposla was looking at something to what yum has had
> > built into it for a while. Every yum installation has a file
> > /var/lib/yum/uuid which contains whatever was pulled from
> > /proc/sys/kernel/random/uuid when yum was installed.  Here is one
> > example 34cb9496-a62c-496e-8935-22f550247262
>
> Uh, please don't do it this way. People build reusable images of

As I said that was the original proposal which was from a proof of
concept of what was already in existence. It has a bunch of problems
as you said. The reason for using the /proc/sys was because it could
be cron'd and rebuilt regularly if needed and the kernel items was
avaliable for EL5 (when I started working on this) -> EL7. With
systemd's /etc/machine-id and having a regular hmac regeneration
process would be equally useful.

> Fedora that are then run unmodified in many instances. If you invent a
> new file for a new uuid like this then it's highly unlikely people
> will reset it when building such images, and hence your counting will
> count all such instances as one, which you probably don't want.
>
> Hence, any such uuid should be keyed off /etc/machine-id, as that file
> exists for purposes like this, and the chance that it is reset during
> image building is higher, and doesn't require people to reset uuids
> all over the place.
>
> hence my recommendation to derive the any uuid for purposes like this
> from /etc/machine-id, by using a HMAC of some kind (see other mail).
>
> Lennart
>
> --
> Lennart Poettering, Red Hat
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-- 
Stephen J Smoogen.
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