$ git clone -n https://src.fedoraproject.org/rpms/R-igraph.git /var/lib/mock/f38-build-side-42-init-devel-966239-28808/root/chroot_tmpdir/scmroot/R-igraph
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-966239-28808/root/chroot_tmpdir/scmroot/R-igraph'...
$ git fetch origin 1ba1b343c307145358aea7f51ea3508e31fb482c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-igraph
 * [new ref]         1ba1b343c307145358aea7f51ea3508e31fb482c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ba1b34 update to 1.4.1