$ git clone -n https://src.fedoraproject.org/rpms/nbdkit.git /var/lib/mock/f41-build-side-1-2812494-32941/root/chroot_tmpdir/scmroot/nbdkit
Cloning into '/var/lib/mock/f41-build-side-1-2812494-32941/root/chroot_tmpdir/scmroot/nbdkit'...
$ git fetch origin 7b3a2eb66e8229593bc8faab96615bb184a03ead:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbdkit
 * [new ref]         7b3a2eb66e8229593bc8faab96615bb184a03ead -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b3a2eb New upstream development branch version 1.41.6