$ git clone -n https://src.fedoraproject.org/rpms/python-nbconvert.git /var/lib/mock/f40-build-2630647-65688/root/chroot_tmpdir/scmroot/python-nbconvert
Cloning into '/var/lib/mock/f40-build-2630647-65688/root/chroot_tmpdir/scmroot/python-nbconvert'...
$ git fetch origin cbcc04909cd4b1714c8289186463282bf52c8947:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbconvert
 * [new ref]         cbcc04909cd4b1714c8289186463282bf52c8947 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbcc049 Update to 7.16.0 (rhbz#2262893)