$ git clone -n https://src.fedoraproject.org/rpms/python-nbconvert.git /var/lib/mock/f38-build-side-42-init-devel-620252-26338/root/chroot_tmpdir/scmroot/python-nbconvert
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-620252-26338/root/chroot_tmpdir/scmroot/python-nbconvert'...
$ git fetch origin 1c57c9a76b5f802b12865b17aaeb4df85de80956:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbconvert
 * [new ref]         1c57c9a76b5f802b12865b17aaeb4df85de80956 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c57c9a Ensure proper version of mistune is required