$ git clone -n https://src.fedoraproject.org/rpms/nbdkit.git /var/lib/mock/f40-build-2517851-61731/root/chroot_tmpdir/scmroot/nbdkit
Cloning into '/var/lib/mock/f40-build-2517851-61731/root/chroot_tmpdir/scmroot/nbdkit'...
$ git fetch origin 26d336167f2683a4ab8669556e7df589e912f189:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbdkit
 * [new ref]         26d336167f2683a4ab8669556e7df589e912f189 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26d3361 New upstream development version 1.37.10