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