$ git clone -n https://src.fedoraproject.org/rpms/kdiagram.git /var/lib/mock/f45-build-14684-462/root/chroot_tmpdir/scmroot/kdiagram
Cloning into '/var/lib/mock/f45-build-14684-462/root/chroot_tmpdir/scmroot/kdiagram'...
$ git fetch origin 7e1b495e350439ae9eb165429f23eb7f4d26a9a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdiagram
 * [new ref]         7e1b495e350439ae9eb165429f23eb7f4d26a9a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e1b495 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild