$ git clone -n https://src.fedoraproject.org/rpms/R-dtplyr.git /var/lib/mock/f45-build-6076-346/root/chroot_tmpdir/scmroot/R-dtplyr
Cloning into '/var/lib/mock/f45-build-6076-346/root/chroot_tmpdir/scmroot/R-dtplyr'...
$ git fetch origin facd5a6dd27a6e9244b94675aa8b7aba17aa1f8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-dtplyr
 * [new ref]         facd5a6dd27a6e9244b94675aa8b7aba17aa1f8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at facd5a6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild