$ git clone -n https://src.fedoraproject.org/rpms/nss.git /var/lib/mock/f42-build-side-1-3586877-46926/root/chroot_tmpdir/scmroot/nss
Cloning into '/var/lib/mock/f42-build-side-1-3586877-46926/root/chroot_tmpdir/scmroot/nss'...
$ git fetch origin ea86a7eb4eb8e69051c327da06918572ca5563a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nss
 * [new ref]         ea86a7eb4eb8e69051c327da06918572ca5563a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea86a7e Update NSS to 3.113.0