$ git clone -n https://src.fedoraproject.org/rpms/python-nbsphinx.git /var/lib/mock/f40-build-2227594-53030/root/chroot_tmpdir/scmroot/python-nbsphinx
Cloning into '/var/lib/mock/f40-build-2227594-53030/root/chroot_tmpdir/scmroot/python-nbsphinx'...
$ git fetch origin 6203471c6b9dc6c82e1484900599567460ba5266:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbsphinx
 * [new ref]         6203471c6b9dc6c82e1484900599567460ba5266 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6203471 Update to 0.9.3 (rhbz#2235169)