$ git clone -n https://src.fedoraproject.org/rpms/python-nbclient.git /var/lib/mock/f39-build-1763132-41501/root/chroot_tmpdir/scmroot/python-nbclient
Cloning into '/var/lib/mock/f39-build-1763132-41501/root/chroot_tmpdir/scmroot/python-nbclient'...
$ git fetch origin 98a297b1245de82cc2980ac8e75b2a5ba6c77da4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbclient
 * [new ref]         98a297b1245de82cc2980ac8e75b2a5ba6c77da4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98a297b Update to 0.8.0 (rhbz#2183943)