Add default browser checking and setting on Linux.

chrome/browser/shell_integration_linux.cc

+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/shell_integration.h"
+
+#include <stdlib.h>
+
+#include <vector>
+
+#include "base/process_util.h"
+
+#if defined(GOOGLE_CHROME_BUILD)
+#define DESKTOP_APP_NAME "google-chrome.desktop"
+#else  // CHROMIUM_BUILD
+#define DESKTOP_APP_NAME "chromium-browser.desktop"
+#endif
+
+// We delegate the difficult of setting the default browser in Linux desktop
+// environments to a new xdg utility, xdg-settings. We'll have to include a copy
+// of it for this to work, obviously, but that's actually the suggested approach
+// for xdg utilities anyway.
+
+bool ShellIntegration::SetAsDefaultBrowser() {
+  std::vector<std::string> argv;
+  argv.push_back("xdg-settings");
+  argv.push_back("set");
+  argv.push_back("default-web-browser");
+  argv.push_back(DESKTOP_APP_NAME);
+
+  int success_code;
+  base::ProcessHandle handle;
+  base::file_handle_mapping_vector no_files;
+  if (!base::LaunchApp(argv, no_files, false, &handle))
+    return false;
+
+  base::WaitForExitCode(handle, &success_code);
+  return success_code == EXIT_SUCCESS;
+}
+
+static std::string getDefaultBrowser() {
+  std::vector<std::string> argv;
+  argv.push_back("xdg-settings");
+  argv.push_back("get");
+  argv.push_back("default-web-browser");
+  std::string output;
+  base::GetAppOutput(CommandLine(argv), &output);
+  // If GetAppOutput() fails, we'll return the empty string.
+  return output;
+}
+
+bool ShellIntegration::IsDefaultBrowser() {
+  std::string browser = getDefaultBrowser();
+  // Allow for an optional newline at the end.
+  if (browser.length() > 0 && browser[browser.length() - 1] == '\n')
+    browser.resize(browser.length() - 1);
+  if (!browser.length()) {
+    // We don't know what the default browser is; chances are, we can't
+    // set it either. So, check to see if we were run in the wrapper
+    // and pretend that we are the default unless we were run from it,
+    // to avoid warning that we aren't the default when it's useless.
+    return !getenv("CHROME_WRAPPER");
+  }
+  return !browser.compare(DESKTOP_APP_NAME);
+}
+
+bool ShellIntegration::IsFirefoxDefaultBrowser() {
+  return getDefaultBrowser().find("irefox") != std::string::npos;
+}