$ git clone -n https://src.fedoraproject.org/rpms/cffconvert.git /var/lib/mock/f45-build-3860-327/root/chroot_tmpdir/scmroot/cffconvert
Cloning into '/var/lib/mock/f45-build-3860-327/root/chroot_tmpdir/scmroot/cffconvert'...
$ git fetch origin b1f5992ecb7ebf5de346cedb16b1b161b0cea6dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cffconvert
 * [new ref]         b1f5992ecb7ebf5de346cedb16b1b161b0cea6dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1f5992 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild