$ git clone -n https://src.fedoraproject.org/rpms/rrdtool.git /var/lib/mock/f45-build-34674-690/root/chroot_tmpdir/scmroot/rrdtool
Cloning into '/var/lib/mock/f45-build-34674-690/root/chroot_tmpdir/scmroot/rrdtool'...
$ git fetch origin 4429024df28e45a3af05dcda77fa4358136ca5cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rrdtool
 * [new ref]         4429024df28e45a3af05dcda77fa4358136ca5cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4429024 Rebuilt for libxml-2.5.4