#!/bin/bash

tags="$(git ls-remote --tags https://github.com/BOINC/boinc "client_release/*.*/*.*.*" | \
  grep -v "\^{}\$" | \
  sed "s/^\S\+\s\+.*\/client_release\/[^/]*\/\(.*\)\$/\1/" | \
  sort -n)"
main="$(echo -e "${tags}" | \
  cut -d . -f 1 | \
  sort -n | \
  tail -n1)"
tags="$(echo -e "${tags}" | \
  grep "^${main}\." | \
  sed "s/^[^.]\+\.//")"
sub="$(echo -e "${tags}" | \
  cut -d . -f 1 | \
  sort -n | \
  tail -n1)"
tags="$(echo -e "${tags}" | \
  grep "^${sub}\." | \
  sed "s/^[^.]\+\.//")"
subsub="$(echo -e "${tags}" | \
  sort -n | \
  tail -n1)"

echo "${main}.${sub}.${subsub}"