Re: Possible to combine ExclusiveArch?

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On Sun, Jul 16, 2023 at 02:34:42PM +0100, Richard W.M. Jones wrote:
> On Sat, Jul 15, 2023 at 05:22:38PM +0200, Fabio Valentini wrote:
> > On Fri, Jul 14, 2023 at 2:30 PM Richard W.M. Jones <rjones@xxxxxxxxxx> wrote:
> > >
> > > For some virt packages we need to combine 2 or 3 of:
> > >
> > >   ExclusiveArch: %{kernel_arches}
> > >   ExclusiveArch: %{qemu_sysemu_host_arches}       # [1]
> > >   ExclusiveArch: %{ocaml_native_compiler}
> > >
> > > to mean only compile on the intersection of these arches.  If you have
> > > multiple ExclusiveArch lines then RPM seems to do the union of arches
> > > which is the opposite of what anyone would want.
> > >
> > > Dan Berrange came up with a clever way to do it though ...
> > >
> > >   %ifnarch %{kernel_arches}
> > >   ExcludeArch: %{_arch}
> > >   %endif
> > >   %ifnarch %{qemu_sysemu_host_arches}
> > >   ExcludeArch: %{_arch}
> > >   %endif
> > >
> > > But this makes my head hurt.  Is there a better way or could RPM
> > > provide explicit union and intersection operators?
> > 
> > Well, if you want set union / intersection as an RPM macro, the first
> > thing I'd try would be to implement this as a lua macro ...
> > Lua does not have a native "set" data type, but it can be simulated by
> > using a table's (hashmap's) keys as a "set".
> 
> I think this works ...
> 
>   ExclusiveArch: %{lua:
> 
>   -- "impossible" ensures we don't get "Empty tag: ExclusiveArch:"
>   -- if both lists are the same:

I don't mean "same" I mean "non-overlapping".

>   local arches = { impossible = 1 }
> 
>   local karches = {}
>   for a in macros.kernel_arches:gmatch("%S+") do karches[a] = 1 end
>   for a in macros.java_arches:gmatch("%S+") do
>     if karches[a] then arches[a] = 1 end
>   end
> 
>   for a, t in pairs(arches) do print(a..' ') end
>   }
> 
> eg:
> 
>   $ rpmspec -P test.spec  | grep ExclusiveArch
>   ExclusiveArch: ppc64le x86_64 s390x impossible aarch64
> 
> It's a shame Lua doesn't have an intersection operator though.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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