$ git clone -n https://src.fedoraproject.org/rpms/reposurgeon.git /var/lib/mock/f41-build-846638-163159/root/chroot_tmpdir/scmroot/reposurgeon
Cloning into '/var/lib/mock/f41-build-846638-163159/root/chroot_tmpdir/scmroot/reposurgeon'...
$ git fetch origin 5507d680b1b44b6b774d6f7d67df0c67e8cac04b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/reposurgeon
 * [new ref]         5507d680b1b44b6b774d6f7d67df0c67e8cac04b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5507d68 reposurgeon: 5.1 release