$ git clone -n https://src.fedoraproject.org/rpms/python-nbconvert.git /var/lib/mock/f40-build-2256458-54280/root/chroot_tmpdir/scmroot/python-nbconvert
Cloning into '/var/lib/mock/f40-build-2256458-54280/root/chroot_tmpdir/scmroot/python-nbconvert'...
$ git fetch origin bd2e5efc5b92caac3a3186f360a3624014dea235:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-nbconvert
 * [new ref]         bd2e5efc5b92caac3a3186f360a3624014dea235 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd2e5ef Update to 7.14.2 (rhbz#2258618)