$ git clone -n https://src.fedoraproject.org/rpms/centos-packager.git /var/lib/mock/f45-build-5819-342/root/chroot_tmpdir/scmroot/centos-packager
Cloning into '/var/lib/mock/f45-build-5819-342/root/chroot_tmpdir/scmroot/centos-packager'...
$ git fetch origin 3cce71acb4a261892b18f5fc9062d64493d377fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/centos-packager
 * [new ref]         3cce71acb4a261892b18f5fc9062d64493d377fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3cce71a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild