$ git clone -n https://src.fedoraproject.org/rpms/opendkim.git /var/lib/mock/f45-build-21021-577/root/chroot_tmpdir/scmroot/opendkim
Cloning into '/var/lib/mock/f45-build-21021-577/root/chroot_tmpdir/scmroot/opendkim'...
$ git fetch origin 23f9c3fb8a57902f4794791d5ac78bda15872109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/opendkim
 * [new ref]         23f9c3fb8a57902f4794791d5ac78bda15872109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23f9c3f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild