$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-smallsemi.git /var/lib/mock/f38-build-side-42-init-devel-966867-28808/root/chroot_tmpdir/scmroot/gap-pkg-smallsemi
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-966867-28808/root/chroot_tmpdir/scmroot/gap-pkg-smallsemi'...
$ git fetch origin d6c3e7f15417f9badcb2ab5f90e836032fefe7b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-smallsemi
 * [new ref]         d6c3e7f15417f9badcb2ab5f90e836032fefe7b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6c3e7f Use the %gap_arches macro.