$ git clone -n https://src.fedoraproject.org/rpms/nyx.git /var/lib/mock/f41-build-side-1-2752244-31164/root/chroot_tmpdir/scmroot/nyx
Cloning into '/var/lib/mock/f41-build-side-1-2752244-31164/root/chroot_tmpdir/scmroot/nyx'...
$ git fetch origin b47c9d403d02b806261a90c9da92e855f5dc61ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nyx
 * [new ref]         b47c9d403d02b806261a90c9da92e855f5dc61ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b47c9d4 convert GPLv3 license to SPDX