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
  12 namespace mozilla {
  13 namespace widget {
  14 namespace lsb {
  15
  16 static const char* gLsbReleasePath = "/usr/bin/lsb_release";
  17
  18 bool
  19 GetLSBRelease(nsACString& aDistributor,
  20               nsACString& aDescription,
  21               nsACString& aRelease,
  22               nsACString& aCodename)
  23 {
  24   if (access(gLsbReleasePath, R_OK) != 0)
  25     return false;
  26
  27   int pipefd[2];
  28   if (pipe(pipefd) == -1) {
  29     NS_WARNING("pipe() failed!");
  30     return false;
  31   }
  32
  33   std::vector<std::string> argv = {
  34     gLsbReleasePath, "-idrc"
  35   };
  36
  37   base::LaunchOptions options;
  38   options.fds_to_remap.push_back({ pipefd[1], STDOUT_FILENO });
  39   options.wait = true;
  40
  41   base::ProcessHandle process;
  42   bool ok = base::LaunchApp(argv, options, &process);
  43   close(pipefd[1]);
  44   if (!ok) {
  45     NS_WARNING("Failed to spawn lsb_release!");
  46     close(pipefd[0]);
  47     return false;
  48   }
  49
  50   FILE* stream = fdopen(pipefd[0], "r");
  51   if (!stream) {
  52     NS_WARNING("Could not wrap fd!");
  53     close(pipefd[0]);
  54     return false;
  55   }
  56
  57   char dist[256], desc[256], release[256], codename[256];
  58   if (fscanf(stream, "Distributor ID:\t%255[^\n]\n"
  59                      "Description:\t%255[^\n]\n"
  60                      "Release:\t%255[^\n]\n"
  61                      "Codename:\t%255[^\n]\n",
  62              dist, desc, release, codename) != 4)
  63   {
  64     NS_WARNING("Failed to parse lsb_release!");
  65     fclose(stream);
  66     close(pipefd[0]);
  67     return false;
  68   }
  69   fclose(stream);
  70   close(pipefd[0]);
  71
  72   aDistributor.Assign(dist);
  73   aDescription.Assign(desc);
  74   aRelease.Assign(release);
  75   aCodename.Assign(codename);
  76   return true;
  77 }
  78
  79 }  // namespace lsb
  80 }  // namespace widget
  81 }  // namespace mozilla