$ git clone -n https://src.fedoraproject.org/rpms/R-broom.git /var/lib/mock/f40-build-2175232-51067/root/chroot_tmpdir/scmroot/R-broom
Cloning into '/var/lib/mock/f40-build-2175232-51067/root/chroot_tmpdir/scmroot/R-broom'...
$ git fetch origin e19d113b8d599d80d0a6a129e07be4bc3d8f4c11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-broom
 * [new ref]         e19d113b8d599d80d0a6a129e07be4bc3d8f4c11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e19d113 Update to 1.0.5