Subject: Re: supporting multiple versions of same package in single repo
To: ~alpine/apk-tools@lists.alpinelinux.org
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From: "A. Wilcox" <awilfox@adelielinux.org>
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Message-ID: <0775a15b-28d3-9bf9-1796-e119b72ca31e@adelielinux.org>
Date: Tue, 4 Feb 2020 14:59:43 -0600
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On 04/02/2020 03:06, Timo Teras wrote:
> Hi
>=20
> On Mon, 3 Feb 2020 14:28:21 -0800
> Clayton Craft <clayton@craftyguy.net> wrote:
>=20
>> In postmarketOS we are attempting to have 2 versions of mesa: 'mesa'
>> (from upstream Alpine), and 'mesa-git' (tracks upstream mesa master
>> branch).  The goal is to have both packages + their respective
>> subpackages provide system mesa for an install. Only one (mesa or
>> mesa-git) is expected to be installed on a single system at one time.
>> When a user installs 'mesa-git', and then (for example) installs a
>> package which depends on 'mesa-dev', the idea is that 'mesa-git-dev'
>> would be installed instead of 'mesa-dev'. We want 2 versions of mesa
>> since some devices pmos supports require a newer mesa than what is
>> currently in the latest mesa stable branch.
>>
>> We are having a very hard time coming up with a mesa-git APKBUILD
>> that can do this. In IRC, it was mentioned that we could use a
>> virtual package, and rename 'mesa' to something else, and handle
>> installing either of the 2 packages in the virtual package. This
>> would probably work (?) but is less than ideal since we'd have to
>> keep the renamed mesa package in sync with upstream Alpine's mesa
>> package.
>>
>> Arch Linux seems to be able to handle this scenario without issue,
>> AUR has a mesa-git package which results in mesa-git-* subpackages
>> being installed at the right time (when something depends on
>> mesa-dev, etc). Is apk/APKBUILD capable of supporting this, or does
>> anyone have any advice/suggestions on how this goal could be achieved?=

>=20
> Interesting setup. I wonder if in Arch it is a feature where a global
> substitution rule diverts mesa-dev to mesa-git-dev or similar.
>=20
> Using purely apk dependencies, you could try the following:
>=20
> 1. mesa-git-dev
>   provides=3D"mesa-dev"
>   provider_priority=3D1
>=20
>   The provides tells it's good for 'mesa-dev'. Since there's no provide=
d
>   version specified it's not good for automatic install; the
>   provider_priority=3D1 makes that happen.
>=20
>   One caveat is at least that if someone depends e.g "mesa-dev>19.0", i=
t
>   would not get satisfied with the mesa-git-dev.
>=20
>   OR
>=20
>   provides=3D"mesa-dev=3D19.2"
>=20
>   To make the git act as if it was this version. You probably then want=

>   a smaller version than what the real mesa is so that the mesa-git-dev=

>   does not get preferred always.
>=20
> 2. mesa-git
>   depends=3D"!mesa"
>=20
>   To make sure that depending on 'mesa-dev' does not prefer the real
>   package and try to pull in it's dependencies.
>=20
> Interesting to hear if the above works.
>=20
> Timo
>=20

We use something like the first one for our kernel build.  The package
name is easy-kernel-5.4.5-mc0 (for instance), which
provides=3D"easy-kernel=3D5.4.5-r0".

https://code.foxkit.us/adelie/packages/blob/master/system/easy-kernel/APK=
BUILD

It works okay, and you could probably use depends=3D on the subpkgs to
ensure that they're all consistent.

We still sort of wish that it was possible to side-by-side install
packages that provides=3D"$pkgname" with different versions, so people
could have more than one kernel version installed if the installed files
don't conflict (which wouldn't with kernels).  But I suppose that is
unrelated to this topic.


Best,
--arw


--=20
A. Wilcox (awilfox)
Project Lead, Ad=C3=A9lie Linux
https://www.adelielinux.org


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