$ git clone -n https://src.fedoraproject.org/rpms/reposurgeon.git /var/lib/mock/f38-build-729862-101876/root/chroot_tmpdir/scmroot/reposurgeon
Cloning into '/var/lib/mock/f38-build-729862-101876/root/chroot_tmpdir/scmroot/reposurgeon'...
$ git fetch origin f66ef5b43e04aa35eb6a706ce1a4fdd4726164a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/reposurgeon
 * [new ref]         f66ef5b43e04aa35eb6a706ce1a4fdd4726164a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f66ef5b reposurgeon: 4.36 release