[Epel-packagers-sig] [Bug 2293727] New: Extras subpackages are arched, they should not be

https://bugzilla.redhat.com/show_bug.cgi?id=2293727

Bug ID: 2293727
           Summary: Extras subpackages are arched, they should not be
           Product: Fedora
           Version: rawhide
          Hardware: All
                OS: Linux
            Status: NEW
         Component: python-dask
          Severity: medium
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail],
                    [e-mail],
                    [e-mail],
                    [e-mail]
  Target Milestone: ---
    Classification: Fedora

python-dask.spec has this comment:

# We have an arched package to detect arch-dependent issues in dependencies,
# but all of the installable RPMs are noarch and there is no compiled code.

however, it is a lie, because of the use of `%pyproject_extras_subpkg`:

%pyproject_extras_subpkg -n python3-%{srcname} array bag dataframe delayed

that macro does not include BuildArch: noarch when expanded:

[adamw@xps13a python-dask (rawhide %)]$ rpm --eval "%pyproject_extras_subpkg -n
python3-foo bar"
%package -n python3-foo+bar
Summary: Metapackage for python3-foo: bar extras
Requires: python3-foo = %{version}-%{release}
%description -n python3-foo+bar
This is a metapackage bringing in bar extras requires for python3-foo.
It makes sure the dependencies are installed.

%files -n python3-foo+bar -f
/home/adamw/rpmbuild/BUILD/%{name}-%{version}-%{release}.x86_64-pyproject-ghost-distinfo

so all these subpackages are actually archful, as you can see in a dask build:
https://koji.fedoraproject.org/koji/buildinfo?buildID=2477169

assigning to Ben Beasley, as this setup was his idea.