$ git clone -n https://src.fedoraproject.org/rpms/python-libcst.git /var/lib/mock/f42-build-side-1-3512255-46067/root/chroot_tmpdir/scmroot/python-libcst
Cloning into '/var/lib/mock/f42-build-side-1-3512255-46067/root/chroot_tmpdir/scmroot/python-libcst'...
$ git fetch origin c0aa8b4fe039abddecf4ee0fcd2f885bb2932c5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-libcst
 * [new ref]         c0aa8b4fe039abddecf4ee0fcd2f885bb2932c5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0aa8b4 Update to 1.7.0; Fixes: RHBZ#2351860