$ git clone -n https://src.fedoraproject.org/rpms/reStream.git /var/lib/mock/f45-build-34385-685/root/chroot_tmpdir/scmroot/reStream
Cloning into '/var/lib/mock/f45-build-34385-685/root/chroot_tmpdir/scmroot/reStream'...
$ git fetch origin 6daaf3443cc608b0e03230e1b99f37a5af7add0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/reStream
 * [new ref]         6daaf3443cc608b0e03230e1b99f37a5af7add0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6daaf34 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild