$ git clone -n https://src.fedoraproject.org/rpms/libdicom.git /var/lib/mock/f45-build-16042-481/root/chroot_tmpdir/scmroot/libdicom
Cloning into '/var/lib/mock/f45-build-16042-481/root/chroot_tmpdir/scmroot/libdicom'...
$ git fetch origin c3df9c3e0d1ae9db4598d8d1dabb98091e989388:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdicom
 * [new ref]         c3df9c3e0d1ae9db4598d8d1dabb98091e989388 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c3df9c3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild