$ git clone -n https://src.fedoraproject.org/rpms/libSM.git /var/lib/mock/f45-build-15770-479/root/chroot_tmpdir/scmroot/libSM
Cloning into '/var/lib/mock/f45-build-15770-479/root/chroot_tmpdir/scmroot/libSM'...
$ git fetch origin edd8fe76bdc10244a58e6e5b354511656cc1fd4b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libSM
 * [new ref]         edd8fe76bdc10244a58e6e5b354511656cc1fd4b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at edd8fe7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild