Re: ostree multiarch support

[Colin Walters <walters verbum org>]

On Tue, Apr 26, 2016, at 06:00 PM, Dennis Gilmore wrote:
> Hi all,
>
> So I am trying to figure out how from a release engineering perspective ostree 
> and rpm-ostree are supposed to handle multiarch support.  take teh atomic host 
> json file I ahd to make the following changes to make it work on arm
>
> git diff
> diff --git a/fedora-atomic-docker-host.json b/fedora-atomic-docker-host.json
> index e818ec1..02caf9d 100644
> --- a/fedora-atomic-docker-host.json
> +++ b/fedora-atomic-docker-host.json
> @@ -1,5 +1,5 @@
>  {
> -    "ref": "fedora-atomic/rawhide/x86_64/docker-host",
> +    "ref": "fedora-atomic/rawhide/armhfp/docker-host",

This one is https://github.com/projectatomic/rpm-ostree/pull/274


>      "repos": ["fedora-rawhide"],
>  
> @@ -31,8 +31,7 @@
>                  "rpm-ostree", "lvm2",
>                  "authconfig",
>                  "btrfs-progs", "e2fsprogs", "xfsprogs",
> -                "grub2", "grub2-efi", "ostree-grub2",
> -                "efibootmgr", "shim",
> +                "extlinux-bootloader",
>                  "gnupg2",
>                  "basesystem",
>                  "python",

I did post a WIP comps patch, https://github.com/rpm-software-management/libhif/pull/135
but thinking about this more - this seems most simply handled with the existing treefile
inheritance.

I.e we'd have fedora-atomic-docker-host-x86_64.json:
{
  "include": "fedora-atomic-docker-base.json",
  "packages": ""grub2", "grub2-efi", "ostree-grub2"
}

Yeah, it does duplicate comps a bit, but on the other hand
the bootloader part of comps is pretty small, and it's not
like new architectures are invented often or bootloaders change
so much that it'd really be a constant maintenance pain I'd say.

The other option is to template the treefiles.  Having them be
JSON was an explicit choice to support this.

The other choice is
https://github.com/projectatomic/rpm-ostree/pull/305
which was simple to write...but I'm thinking the inheritance is
best to try for now.   Thoughts?