$ git clone -n https://src.fedoraproject.org/rpms/klettres.git /var/lib/mock/f45-build-15244-471/root/chroot_tmpdir/scmroot/klettres
Cloning into '/var/lib/mock/f45-build-15244-471/root/chroot_tmpdir/scmroot/klettres'...
$ git fetch origin 81bd17190629c7b0a1cf5c3f6bd77d6c834974f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/klettres
 * [new ref]         81bd17190629c7b0a1cf5c3f6bd77d6c834974f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81bd171 26.08.1