$ git clone -n https://src.fedoraproject.org/rpms/python-jinja2-cli.git /var/lib/mock/f45-build-31258-651/root/chroot_tmpdir/scmroot/python-jinja2-cli
Cloning into '/var/lib/mock/f45-build-31258-651/root/chroot_tmpdir/scmroot/python-jinja2-cli'...
$ git fetch origin a16d4eb1d23632e72b5066b23ca1433ecac7091b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-jinja2-cli
 * [new ref]         a16d4eb1d23632e72b5066b23ca1433ecac7091b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a16d4eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild