Re: Fedora 33 System-Wide Change Proposal: ELN Buildroot and Compose V3

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On Wed, Apr 01, 2020 at 12:30:13PM +0200, Miro Hrončok wrote:
> On 01. 04. 20 10:53, Zbigniew Jędrzejewski-Szmek wrote:
> >On Tue, Mar 31, 2020 at 11:31:38AM -0400, Stephen Gallagher wrote:
> >>I sent out the V2 version of the Change on Friday and then promptly
> >>managed to injure myself and be away from email until today. I've read
> >>through the email threads again this morning and I decided that,
> >>rather than try to address them one by one, I'd try again with a V3
> >>that hopefully answers some of the repeated questions and concerns on
> >>that list.
> >
> >>To enable ELN (once the repository is composed):
> >>
> >>$ dnf install fedora-repos-eln
> >>$ dnf distro-sync
> >
> >I don't see this part explained. Those additional packages will haves
> >NEVRAs always lower than rawhide packages (".eln" < ".fc33".). So this
> >distro-sync will be a noop?
> 
> A wild guess: If that repo has lower "cost", will distro-sync prefer
> packages with lower EVR because they come form that repo?

I don't think so: "cost — ... It is useful to make the library prefer
on-disk repositories to remote ones."

But there's a "priority" option: "If there is more than one candidate
package for a particular operation, the one from a repo with the
lowest priority value is picked, possibly despite being less
convenient otherwise (e.g. by being a lower version)."

This should do the trick. The mechanism should be described in the
Change page too.

(Note: I had a sense of deja-vu, because 'priority' was already
discussed in the context of this Change, but it was koji priority for
scheduling tasks, not package installation.)

Zbyszek
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