$ git clone -n https://src.fedoraproject.org/rpms/config-kernel.git /var/lib/mock/f45-build-5845-342/root/chroot_tmpdir/scmroot/config-kernel
Cloning into '/var/lib/mock/f45-build-5845-342/root/chroot_tmpdir/scmroot/config-kernel'...
$ git fetch origin ac7a92cda905b35800c8e6ecc472d55acf72ca31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/config-kernel
 * [new ref]         ac7a92cda905b35800c8e6ecc472d55acf72ca31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac7a92c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild