On Wed, 4 Apr 2018, 19:54 Stephen Gallagher, <sgall...@redhat.com> wrote:
>
>
> On Wed, Apr 4, 2018 at 2:36 PM Przemek Klosowski <
> przemek.klosow...@nist.gov> wrote:
>
>> On 04/04/2018 01:59 PM, Stephen Gallagher wrote:
>> > The short version is that Modules *are* distribution packages. They're
>> > just distribution packages that allow you to pick which major release
>> > stream you want to stay on. We also have a distribution-level defaults
>> > setup that allows you to pick one stream from the module and call that
>> > the "default" for a particular Fedora release. Once that stream is so
>> > marked, it just shows up automatically in DNF identically to the way
>> > that traditional distribution RPMs do today. So let's say that in
>> > Fedora 28 you make PHP into a module with the stream "7.2". We mark
>> > that as the default. People can then `dnf install php` exactly as they
>> > always could; the only thing they might see different would be the
>> > %{release} tag of the RPM.
>> >
>> > Now, let's assume that PHP upstream decided to release 8.0 next month.
>> > Fedora 29 would probably use that as its default module and would
>> > package the same way as the above. *However*, you now also have the
>> > opportunity to mark the module as being available for both F28 and F29
>> > and the Module Build Service would produce it for both. And now users
>> > of Fedora 28 can opt in to 8.0 before F29 is released if they want to.
>> > And the reverse is true as well: when upgrading to Fedora 29, users
>> > can opt to keep their version of PHP on 7.2 to continue supporting
>> > their application.
>> >
>> This is cool---so what command do you use to choose PHP 8.0 in F28? and
>> how do you choose to stay on 7.2 in F29?
>>
>>
> On F28
> `dnf install php:8/server` (Assuming there's a profile called "server"
> with the packages one would need to use PHP in a server context)
>
> On F29, if you have the php:7 module enabled in F28, an upgrade will not
> switch this on you. If it's a clean install:
> `dnf install php:7/server`
>
> (Note: I don't know if PHP is backwards-compatible between minor versions;
> If it's not, then it would probably be php:7.2 and php:8.0 instead)
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This is intriguing and a big improvement over the previous plans I alluded
to.
Once we've got the update train going, and F28 is released, could I please
pick your brains a bit on this?
Combined with my ansible playbooks (which a quick look at the fedora-ci
wiki pages I think I might be able to use there) it really could make life
easier and even allow users to change major version at their own
preference.
>
>
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