$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-qpa.git /var/lib/mock/f38-build-side-42-init-devel-907771-28633/root/chroot_tmpdir/scmroot/gap-pkg-qpa
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-907771-28633/root/chroot_tmpdir/scmroot/gap-pkg-qpa'...
$ git fetch origin 40983c95f21a9cee57260cb054a92164afe1693a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-qpa
 * [new ref]         40983c95f21a9cee57260cb054a92164afe1693a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40983c9 Use the %gap_arches macro.