$ git clone -n https://src.fedoraproject.org/rpms/libselinux.git /var/lib/mock/f40-build-2087521-50157/root/chroot_tmpdir/scmroot/libselinux
Cloning into '/var/lib/mock/f40-build-2087521-50157/root/chroot_tmpdir/scmroot/libselinux'...
$ git fetch origin b123d8adf5068a4649d9046d086a426fcbeda939:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libselinux
 * [new ref]         b123d8adf5068a4649d9046d086a426fcbeda939 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b123d8a SELinux userspace 3.6 release