$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-orb.git /var/lib/mock/f41-build-1102533-20044/root/chroot_tmpdir/scmroot/gap-pkg-orb
Cloning into '/var/lib/mock/f41-build-1102533-20044/root/chroot_tmpdir/scmroot/gap-pkg-orb'...
$ git fetch origin 20e66920d8856a2bc380501259cd6951a1bd539d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-orb
 * [new ref]         20e66920d8856a2bc380501259cd6951a1bd539d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20e6692 Rebuild for gap 4.13.0