$ git clone -n https://src.fedoraproject.org/rpms/R-IRanges.git /var/lib/mock/f41-build-side-1-2749577-31004/root/chroot_tmpdir/scmroot/R-IRanges
Cloning into '/var/lib/mock/f41-build-side-1-2749577-31004/root/chroot_tmpdir/scmroot/R-IRanges'...
$ git fetch origin e50d8d36d391b778d0009a95ee5fac20e08fdb72:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-IRanges
 * [new ref]         e50d8d36d391b778d0009a95ee5fac20e08fdb72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e50d8d3 Migrate to SPDX license