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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