$ git clone -n https://src.fedoraproject.org/rpms/fmf-jinja.git /var/lib/mock/f45-build-9117-399/root/chroot_tmpdir/scmroot/fmf-jinja
Cloning into '/var/lib/mock/f45-build-9117-399/root/chroot_tmpdir/scmroot/fmf-jinja'...
$ git fetch origin cb3f51d457a7ea8c6b82e171d61e1be9596ed0e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fmf-jinja
 * [new ref]         cb3f51d457a7ea8c6b82e171d61e1be9596ed0e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb3f51d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild