Check filesystem

check_fs.cc

#include <boost/filesystem.hpp>
#include <iostream>

// g++ -o boo boo.cc -lboost_filesystem
// clang++ -o boo boo.cc -lboost_filesystem
int main() {
    boost::filesystem::path p("/");

    auto freeSpace = boost::filesystem::space(p).free;
    std::cout << freeSpace << " Bytes free" << std::endl;
    std::cout << freeSpace / (1 << 20) << " MB free" << std::endl;

    // free space available to a non-privileged process
    auto availableSpace = boost::filesystem::space(p).available;
    std::cout << availableSpace << " Bytes available" << std::endl;
    std::cout << availableSpace / (1 << 20) << " MB available" << std::endl;

    auto totalSpace = boost::filesystem::space(p).capacity;
    std::cout << totalSpace << " Bytes capacity" << std::endl;
    std::cout << totalSpace / (1 << 20) << " MB capacity" << std::endl;

    auto usedSpace = totalSpace - freeSpace;
    std::cout << usedSpace << " Bytes used" << std::endl;
    std::cout << usedSpace / (1 << 20) << " MB used" << std::endl;

    auto usedPercent = static_cast<double>(usedSpace) / static_cast<double>(totalSpace);
    std::cout << usedPercent << " percent used" << std::endl;

    return 0;
}