$ git clone -n https://src.fedoraproject.org/rpms/tiptop.git /var/lib/mock/f41-build-side-1-2670653-29060/root/chroot_tmpdir/scmroot/tiptop
Cloning into '/var/lib/mock/f41-build-side-1-2670653-29060/root/chroot_tmpdir/scmroot/tiptop'...
$ git fetch origin fb9691d3f5172c9da1ba61b08cdb8e2d8a9c92d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tiptop
 * [new ref]         fb9691d3f5172c9da1ba61b08cdb8e2d8a9c92d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb9691d convert GPLv2 license to SPDX