$ git clone -n https://src.fedoraproject.org/rpms/iproute.git /var/lib/mock/f42-build-867448-175505/root/chroot_tmpdir/scmroot/iproute
Cloning into '/var/lib/mock/f42-build-867448-175505/root/chroot_tmpdir/scmroot/iproute'...
$ git fetch origin 7e1077b3ac5c7c4751fa4b8eaa8bf48ad8bc2d45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iproute
 * [new ref]         7e1077b3ac5c7c4751fa4b8eaa8bf48ad8bc2d45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e1077b Rebuilt for the bin-sbin merge (2nd attempt)