$ git clone -n https://src.fedoraproject.org/rpms/nftables.git /var/lib/mock/f40-build-2220560-52665/root/chroot_tmpdir/scmroot/nftables
Cloning into '/var/lib/mock/f40-build-2220560-52665/root/chroot_tmpdir/scmroot/nftables'...
$ git fetch origin 5b39a5c510ae84deacdf848eaf92de5ba32b0b50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nftables
 * [new ref]         5b39a5c510ae84deacdf848eaf92de5ba32b0b50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b39a5c nftables-1.0.9-1