$ git clone -n https://src.fedoraproject.org/rpms/librhsm.git /var/lib/mock/f45-build-16880-493/root/chroot_tmpdir/scmroot/librhsm
Cloning into '/var/lib/mock/f45-build-16880-493/root/chroot_tmpdir/scmroot/librhsm'...
$ git fetch origin 897d673e4809bcd9a08426d44718c5509fab4e39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librhsm
 * [new ref]         897d673e4809bcd9a08426d44718c5509fab4e39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 897d673 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild