$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-hapcryst.git /var/lib/mock/f38-build-side-42-init-devel-942615-28778/root/chroot_tmpdir/scmroot/gap-pkg-hapcryst
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-942615-28778/root/chroot_tmpdir/scmroot/gap-pkg-hapcryst'...
$ git fetch origin 490b744739902ea8f47d9a7d8ec6152f4da21ccf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-hapcryst
 * [new ref]         490b744739902ea8f47d9a7d8ec6152f4da21ccf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 490b744 Use the %gap_arches macro.