$ git clone -n https://src.fedoraproject.org/rpms/iputils.git /var/lib/mock/f40-build-2237015-53529/root/chroot_tmpdir/scmroot/iputils
Cloning into '/var/lib/mock/f40-build-2237015-53529/root/chroot_tmpdir/scmroot/iputils'...
$ git fetch origin 540160dad1c6cafdd874869d8b8e3611f72e662f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iputils
 * [new ref]         540160dad1c6cafdd874869d8b8e3611f72e662f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 540160d fix sources