/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "LSBUtils.h"

#include <unistd.h>

#include "base/process_util.h"

#include "mozilla/FileUtils.h"

namespace mozilla {

namespace widget {

namespace lsb {

static const char* gLsbReleasePath = "/usr/bin/lsb_release";

bool

GetLSBRelease(nsACString& aDistributor,

              nsACString& aDescription,

              nsACString& aRelease,

              nsACString& aCodename)

{

  if (access(gLsbReleasePath, R_OK) != 0)

    return false;

  int pipefd[2];

  if (pipe(pipefd) == -1) {

    NS_WARNING("pipe() failed!");

    return false;

  }

  std::vector<std::string> argv = {

    gLsbReleasePath, "-idrc"

  };

  base::LaunchOptions options;

  options.fds_to_remap.push_back({ pipefd[1], STDOUT_FILENO });

  options.wait = true;

  base::ProcessHandle process;

  bool ok = base::LaunchApp(argv, options, &process);

  close(pipefd[1]);

  if (!ok) {

    NS_WARNING("Failed to spawn lsb_release!");

    close(pipefd[0]);

    return false;

  }

  ScopedCloseFile stream(fdopen(pipefd[0], "r"));

  if (!stream) {

    NS_WARNING("Could not wrap fd!");

    close(pipefd[0]);

    return false;

  }

  char dist[256], desc[256], release[256], codename[256];

  if (fscanf(stream, "Distributor ID:\t%255[^\n]\n"

                     "Description:\t%255[^\n]\n"

                     "Release:\t%255[^\n]\n"

                     "Codename:\t%255[^\n]\n",

             dist, desc, release, codename) != 4)

  {

    NS_WARNING("Failed to parse lsb_release!");

    return false;

  }

  aDistributor.Assign(dist);

  aDescription.Assign(desc);

  aRelease.Assign(release);

  aCodename.Assign(codename);

  return true;

}

}  // namespace lsb

}  // namespace widget

}  // namespace mozilla