$ git clone -n https://src.fedoraproject.org/rpms/R-testthat.git /var/lib/mock/f40-build-2033360-47795/root/chroot_tmpdir/scmroot/R-testthat
Cloning into '/var/lib/mock/f40-build-2033360-47795/root/chroot_tmpdir/scmroot/R-testthat'...
$ git fetch origin a05ed78dd7277934f4e5a4ba976c55a325045b69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-testthat
 * [new ref]         a05ed78dd7277934f4e5a4ba976c55a325045b69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a05ed78 Update to 3.2.0