widget/LSBUtils.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "LSBUtils.h"
   8
   9 #include <unistd.h>
  10 #include "base/process_util.h"
  11 #include "mozilla/FileUtils.h"
  12
  13 namespace mozilla::widget::lsb {
  14
  15 static const char* gLsbReleasePath = "/usr/bin/lsb_release";
  16
  17 bool GetLSBRelease(nsACString& aDistributor, nsACString& aDescription,
  18                    nsACString& aRelease, nsACString& aCodename) {
  19   if (access(gLsbReleasePath, R_OK) != 0) return false;
  20
  21   int pipefd[2];
  22   if (pipe(pipefd) == -1) {
  23     NS_WARNING("pipe() failed!");
  24     return false;
  25   }
  26
  27   std::vector<std::string> argv = {gLsbReleasePath, "-idrc"};
  28
  29   base::LaunchOptions options;
  30   options.fds_to_remap.push_back({pipefd[1], STDOUT_FILENO});
  31   options.wait = true;
  32
  33   base::ProcessHandle process;
  34   bool ok = base::LaunchApp(argv, options, &process);
  35   close(pipefd[1]);
  36   if (!ok) {
  37     NS_WARNING("Failed to spawn lsb_release!");
  38     close(pipefd[0]);
  39     return false;
  40   }
  41
  42   ScopedCloseFile stream(fdopen(pipefd[0], "r"));
  43   if (!stream) {
  44     NS_WARNING("Could not wrap fd!");
  45     close(pipefd[0]);
  46     return false;
  47   }
  48
  49   char dist[256], desc[256], release[256], codename[256];
  50   if (fscanf(stream,
  51              "Distributor ID:\t%255[^\n]\n"
  52              "Description:\t%255[^\n]\n"
  53              "Release:\t%255[^\n]\n"
  54              "Codename:\t%255[^\n]\n",
  55              dist, desc, release, codename) != 4) {
  56     NS_WARNING("Failed to parse lsb_release!");
  57     return false;
  58   }
  59
  60   aDistributor.Assign(dist);
  61   aDescription.Assign(desc);
  62   aRelease.Assign(release);
  63   aCodename.Assign(codename);
  64   return true;
  65 }
  66
  67 }  // namespace mozilla::widget::lsb