import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

widget/LSBUtils.cpp

@@ -0,0 +1,81 @@
+/* -*- 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"
+
+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"
+  };
+
+  std::vector<std::pair<int, int>> fdMap = {
+    { pipefd[1], STDOUT_FILENO }
+  };
+
+  base::ProcessHandle process;
+  base::LaunchApp(argv, fdMap, true, &process);
+  close(pipefd[1]);
+  if (!process) {
+    NS_WARNING("Failed to spawn lsb_release!");
+    close(pipefd[0]);
+    return false;
+  }
+
+  FILE* 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!");
+    fclose(stream);
+    close(pipefd[0]);
+    return false;
+  }
+  fclose(stream);
+  close(pipefd[0]);
+
+  aDistributor.Assign(dist);
+  aDescription.Assign(desc);
+  aRelease.Assign(release);
+  aCodename.Assign(codename);
+  return true;
+}
+
+}  // namespace lsb
+}  // namespace widget
+}  // namespace mozilla