$ git clone -n https://src.fedoraproject.org/rpms/fastd.git /var/lib/mock/f40-build-2217659-52561/root/chroot_tmpdir/scmroot/fastd
Cloning into '/var/lib/mock/f40-build-2217659-52561/root/chroot_tmpdir/scmroot/fastd'...
$ git fetch origin bff478c45533006fa8ef40f0ff6cd79a135d98aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fastd
 * [new ref]         bff478c45533006fa8ef40f0ff6cd79a135d98aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bff478c rebuild for new libsodium