$ git clone -n https://src.fedoraproject.org/rpms/nuclei.git /var/lib/mock/f45-build-19847-556/root/chroot_tmpdir/scmroot/nuclei
Cloning into '/var/lib/mock/f45-build-19847-556/root/chroot_tmpdir/scmroot/nuclei'...
$ git fetch origin 63ef68f9de1472823f974de2795b419e7e3f9f1b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nuclei
 * [new ref]         63ef68f9de1472823f974de2795b419e7e3f9f1b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63ef68f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild