$ git clone -n https://src.fedoraproject.org/rpms/newt.git /var/lib/mock/f40-build-2238603-53580/root/chroot_tmpdir/scmroot/newt
Cloning into '/var/lib/mock/f40-build-2238603-53580/root/chroot_tmpdir/scmroot/newt'...
$ git fetch origin e91787a7bf302b332921f482194fd897e26ac5c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/newt
 * [new ref]         e91787a7bf302b332921f482194fd897e26ac5c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e91787a 0.52.24-1