$ git clone -n https://src.fedoraproject.org/rpms/fbb.git /var/lib/mock/f45-build-8722-394/root/chroot_tmpdir/scmroot/fbb
Cloning into '/var/lib/mock/f45-build-8722-394/root/chroot_tmpdir/scmroot/fbb'...
$ git fetch origin 1acbd7e936718ea6a4beb0ee5bc11dc98c539dab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fbb
 * [new ref]         1acbd7e936718ea6a4beb0ee5bc11dc98c539dab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1acbd7e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild