$ git clone -n https://src.fedoraproject.org/rpms/materia-kde.git /var/lib/mock/f45-build-18099-508/root/chroot_tmpdir/scmroot/materia-kde
Cloning into '/var/lib/mock/f45-build-18099-508/root/chroot_tmpdir/scmroot/materia-kde'...
$ git fetch origin 3ba068e46eee5099ae9c6dc9fc645486ad006bcb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/materia-kde
 * [new ref]         3ba068e46eee5099ae9c6dc9fc645486ad006bcb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ba068e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild