[Libosinfo] [osinfo-db PATCH] RFC: schema: Add "purpose" attribute to medias

[Cole Robinson]

On 11/15/2018 07:36 AM, Fabiano Fidêncio wrote:
> Several distros follow the approach of realeasing ISOs that would be
> focused on Desktop or Server usage. In order to allow Apps to sort the
> ISOs they have according to its "purpose" let's add an additional
> argument to the media element in order to make this distinction.
> 
> An example of the XML would be:
> <media arch="i686" purpose="server">
>    <url>http://old-releases.ubuntu.com/releases/zesty/ubuntu-17.04-server-i386.iso</url>
>    <iso>
>      <volume-id>Ubuntu-Server 17.04(.\d)? i386</volume-id>
>    </iso>
>    <kernel>install/vmlinuz</kernel>
>    <initrd>install/initrd.gz</initrd>
> </media>
> 
> Again, the "purpose" attribute is optional and may have the following
> values: server, desktop, or generic.
> 
> "generic" is the value chosen in case it's not defined.
> 
> https://gitlab.com/libosinfo/libosinfo/issues/7
> 
> Is this approach reasonable? I'd like to get some feedback here before
> implenting the libosinfo side of this. :-)
> 

Seems reasonable to me, but I'm trying to think of how apps/boxes will 
consume this. Let's imagine how we will use this to annotate some 
current os entries:

Ubuntu 18.04: There's one desktop media listed, and multiple server 
media, but all with distinct arch. So the combo of purpose+arch is 
always unique only matches one media entry

Fedora 29: There's two possible purpose=desktop and two purpose=server 
media entries here, the netinst versions and the non-netinst versions. 
What does boxes do here? Does it offer both media options to the user? 
If it only wants to show the non-netinst, how does it do that filtering 
in a maintainable way?

CentOS: Ships both a LiveKDE and LiveGNOME which would both get 
purpose=desktop annotations I suppose. The other piece of media is 
Everything which I guess is just purpose=generic. What would gnome-boxes 
do in this case?

Fedora Atomic: this isn't exposed in osinfo yet but I'm bringing it up 
as another potential future data point: if it's a fedora-X variant then 
that's an additional piece of ISO media we would likely label 
purpose=server. rhel-atomic is a separate OS entry though so maybe 
fedora would follow that pattern

Food for thought

Thanks,
Cole

> Signed-off-by: Fabiano Fidêncio <fidencio at redhat.com>
> ---
>   data/schema/osinfo.rng.in | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
> 
> diff --git a/data/schema/osinfo.rng.in b/data/schema/osinfo.rng.in
> index 6693391..e09d43b 100644
> --- a/data/schema/osinfo.rng.in
> +++ b/data/schema/osinfo.rng.in
> @@ -337,6 +337,14 @@
>       </element>
>     </define>
>   
> +  <define name='purposenames'>
> +    <choice>
> +      <value>generic</value>
> +      <value>desktop</value>
> +      <value>server</value>
> +    </choice>
> +  </define>
> +
>     <define name='media'>
>       <element name='media'>
>         <attribute name='arch'>
> @@ -362,6 +370,11 @@
>             <ref name='bool'/>
>           </attribute>
>         </optional>
> +      <optional>
> +        <attribute name='purpose'>
> +          <ref name='purposenames'/>
> +        </attribute>
> +      </optional>
>         <interleave>
>           <optional>
>             <element name='variant'>
> 


- Cole