$ git clone -n https://src.fedoraproject.org/rpms/nss.git /var/lib/mock/f43-build-59043159-6570564/root/chroot_tmpdir/scmroot/nss
Cloning into '/var/lib/mock/f43-build-59043159-6570564/root/chroot_tmpdir/scmroot/nss'...
$ git fetch origin c1a19bc961336811ba8bd895eeca46d02bfed9ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nss
 * [new ref]         c1a19bc961336811ba8bd895eeca46d02bfed9ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1a19bc Dissable test ssl_policy_pkix_oscp due to dns issues