$ git clone -n https://src.fedoraproject.org/rpms/R-roxygen2.git /var/lib/mock/f38-build-side-42-init-devel-962332-28791/root/chroot_tmpdir/scmroot/R-roxygen2
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-962332-28791/root/chroot_tmpdir/scmroot/R-roxygen2'...
$ git fetch origin 3d0db7a5fbc5c5ddbf430c8789537657b220db37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-roxygen2
 * [new ref]         3d0db7a5fbc5c5ddbf430c8789537657b220db37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d0db7a update to 7.2.3