$ git clone -n https://src.fedoraproject.org/rpms/z80dasm.git /var/lib/mock/f45-build-39305-733/root/chroot_tmpdir/scmroot/z80dasm
Cloning into '/var/lib/mock/f45-build-39305-733/root/chroot_tmpdir/scmroot/z80dasm'...
$ git fetch origin b840ec1c38173a6cc17c017761af40884af7bf6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/z80dasm
 * [new ref]         b840ec1c38173a6cc17c017761af40884af7bf6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b840ec1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild