$ git clone -n https://src.fedoraproject.org/rpms/greenboot.git /var/lib/mock/f45-build-13042-446/root/chroot_tmpdir/scmroot/greenboot
Cloning into '/var/lib/mock/f45-build-13042-446/root/chroot_tmpdir/scmroot/greenboot'...
$ git fetch origin 072a486af43e32eba1c83785aecbf002737ab829:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/greenboot
 * [new ref]         072a486af43e32eba1c83785aecbf002737ab829 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 072a486 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild