$ git clone -n https://src.fedoraproject.org/rpms/ugrep.git /var/lib/mock/f40-build-2157909-50937/root/chroot_tmpdir/scmroot/ugrep
Cloning into '/var/lib/mock/f40-build-2157909-50937/root/chroot_tmpdir/scmroot/ugrep'...
$ git fetch origin b47080a3a6d959f531bd0899219e7a47cfeb1742:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ugrep
 * [new ref]         b47080a3a6d959f531bd0899219e7a47cfeb1742 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b47080a Update to version 3.12.7, resolves rhbz#2232315