$ git clone -n https://src.fedoraproject.org/rpms/python-nbsphinx.git /var/lib/mock/f41-build-side-1-2814726-32949/root/chroot_tmpdir/scmroot/python-nbsphinx
Cloning into '/var/lib/mock/f41-build-side-1-2814726-32949/root/chroot_tmpdir/scmroot/python-nbsphinx'...
$ git fetch origin ac90ec8c2b01e038085b7f724126b2fb651ad109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbsphinx
 * [new ref]         ac90ec8c2b01e038085b7f724126b2fb651ad109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac90ec8 Update to 0.9.5 (rhbz#2304605)