$ git clone -n https://src.fedoraproject.org/rpms/nss.git /var/lib/mock/f41-build-side-1-2821494-33222/root/chroot_tmpdir/scmroot/nss
Cloning into '/var/lib/mock/f41-build-side-1-2821494-33222/root/chroot_tmpdir/scmroot/nss'...
$ git fetch origin a1fdf422a4b9622412af20f3b8699c1e2c7556d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nss
 * [new ref]         a1fdf422a4b9622412af20f3b8699c1e2c7556d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1fdf42 Update NSS to 3.104.0