$ git clone -n https://src.fedoraproject.org/rpms/python-notebook.git /var/lib/mock/f39-build-2029545-47476/root/chroot_tmpdir/scmroot/python-notebook
Cloning into '/var/lib/mock/f39-build-2029545-47476/root/chroot_tmpdir/scmroot/python-notebook'...
$ git fetch origin 66806b632e9447d8dcd426dd559e28a4b37b40e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-notebook
 * [new ref]         66806b632e9447d8dcd426dd559e28a4b37b40e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66806b6 Obsolete python-notebook-doc < 7