$ git clone -n https://src.fedoraproject.org/rpms/R-httpuv.git /var/lib/mock/f41-build-1280372-23185/root/chroot_tmpdir/scmroot/R-httpuv
Cloning into '/var/lib/mock/f41-build-1280372-23185/root/chroot_tmpdir/scmroot/R-httpuv'...
$ git fetch origin 8799c69aa5199afd1bd4df2d7be2dd1efc2d952d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-httpuv
 * [new ref]         8799c69aa5199afd1bd4df2d7be2dd1efc2d952d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8799c69 Update to latest version