#include "install.h"

int
backup()
{
  struct stat sb;

  const std::string bkp = hd + _prefix + "_backup/";

  struct stat stat_dir;
  if (stat(bkp.c_str(), &stat_dir) != 0)
  {
    mkdir(bkp.c_str(), 0700);
  }

  for (auto &i : _vec)
  {
    const std::string source_file = hd + _prefix + "/" + i;
    const std::string dest_file = bkp + i;

    std::cout << "Backing up " << _prefix << "/" << i << "\n";

    int source = open(source_file.c_str(), O_RDONLY, 0);
    int dest = open(dest_file.c_str(), O_WRONLY | O_CREAT /*| O_TRUNC/**/, 0644);

    // struct required, rationale: function stat() exists also
    struct stat stat_source;
    fstat(source, &stat_source);
    sendfile(dest, source, 0, stat_source.st_size);

    close(source);
    close(dest);

    if (access(dest_file.c_str(), F_OK) != 0)
    {
      throw ExceptionHandler(CUSTOM_ERROR, "Backing up " + dest_file + " failed!");
    }
  }
}