$ git clone -n https://src.fedoraproject.org/rpms/jupyterlab.git /var/lib/mock/f39-build-2253979-54222/root/chroot_tmpdir/scmroot/jupyterlab
Cloning into '/var/lib/mock/f39-build-2253979-54222/root/chroot_tmpdir/scmroot/jupyterlab'...
$ git fetch origin abb9400c5010ece955d9b9d364a0237e99b853b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jupyterlab
 * [new ref]         abb9400c5010ece955d9b9d364a0237e99b853b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at abb9400 Make it possible to install jupyterlab extensions via pip