$ git clone -n https://src.fedoraproject.org/rpms/cups-filters.git /var/lib/mock/f39-build-1597619-38458/root/chroot_tmpdir/scmroot/cups-filters
Cloning into '/var/lib/mock/f39-build-1597619-38458/root/chroot_tmpdir/scmroot/cups-filters'...
$ git fetch origin e6af6aa3383f6f9603dfd30ec8ac9788d2940ee2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cups-filters
 * [new ref]         e6af6aa3383f6f9603dfd30ec8ac9788d2940ee2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6af6aa rebase to 2.0.0