$ git clone -n https://src.fedoraproject.org/rpms/R-igraph.git /var/lib/mock/f45-build-6175-346/root/chroot_tmpdir/scmroot/R-igraph
Cloning into '/var/lib/mock/f45-build-6175-346/root/chroot_tmpdir/scmroot/R-igraph'...
$ git fetch origin 87f025474eb012ab3801b18a1e2550be211c4f65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-igraph
 * [new ref]         87f025474eb012ab3801b18a1e2550be211c4f65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87f0254 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild