$ git clone -n https://src.fedoraproject.org/rpms/guilt.git /var/lib/mock/f45-build-13241-447/root/chroot_tmpdir/scmroot/guilt
Cloning into '/var/lib/mock/f45-build-13241-447/root/chroot_tmpdir/scmroot/guilt'...
$ git fetch origin e1bf4b5998db25349048fd8e76fafe2dbfd98e87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guilt
 * [new ref]         e1bf4b5998db25349048fd8e76fafe2dbfd98e87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1bf4b5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild