Use xdg_user_dir_lookup to lookup directories.

chrome/common/chrome_paths_linux.cc

 // Copyright (c) 2006-2008 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/common/chrome_paths_internal.h"
 
 #include <glib.h>
+#include <stdlib.h>
+
 #include "base/file_path.h"
 #include "base/logging.h"
+#include "base/path_service.h"
+#include "chrome/third_party/xdg_user_dirs/xdg_user_dir_lookup.h"
 
 namespace {
 
+FilePath GetHomeDir() {
+  FilePath rv;
+  const char *home_dir = getenv("HOME");
+
+  if (home_dir && home_dir[0])
+    return FilePath(home_dir);
+
+  home_dir = g_get_home_dir();
+  if (home_dir && home_dir[0])
+    return FilePath(home_dir);
+
+  if (PathService::Get(base::DIR_TEMP, &rv))
+    return rv;
+
+  /* last resort */
+  return FilePath("/tmp/");
+}
+
+// Wrapper around xdg_user_dir_lookup() from
+// src/chrome/third_party/xdg-user-dirs
+FilePath GetXDGUserDirectory(const char* env_name, const char* fallback_dir) {
+  char* xdg_dir = xdg_user_dir_lookup(env_name);
+  if (xdg_dir) {
+    FilePath rv(xdg_dir);
+    free(xdg_dir);
+    return rv;
+  }
+  return GetHomeDir().Append(fallback_dir);
+}
+
 // |env_name| is the name of an environment variable that we want to use to get
 // a directory path. |fallback_dir| is the directory relative to $HOME that we
 // use if |env_name| cannot be found or is empty. |fallback_dir| may be NULL.
-// TODO(thestig): Don't use g_getenv() here because most of the time XDG
-// environment variables won't actually be loaded.
-FilePath GetStandardDirectory(const char* env_name, const char* fallback_dir) {
-  FilePath rv;
-  const char* env_value = g_getenv(env_name);
-  if (env_value && env_value[0]) {
-    rv = FilePath(env_value);
-  } else {
-    const char* home_dir = g_getenv("HOME");
-    if (!home_dir)
-      home_dir = g_get_home_dir();
-    rv = FilePath(home_dir);
-    if (fallback_dir)
-      rv = rv.Append(fallback_dir);
-  }
-
-  return rv;
+FilePath GetXDGDirectory(const char* env_name, const char* fallback_dir) {
+  const char* env_value = getenv(env_name);
+  if (env_value && env_value[0])
+    return FilePath(env_value);
+  return GetHomeDir().Append(fallback_dir);
 }
 
 }  // namespace
 
 namespace chrome {
 
 // See http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
 // for a spec on where config files go.  The net effect for most
 // systems is we use ~/.config/chromium/ for Chromium and
 // ~/.config/google-chrome/ for official builds.
 // (This also helps us sidestep issues with other apps grabbing ~/.chromium .)
 bool GetDefaultUserDataDirectory(FilePath* result) {
-  FilePath config_dir = GetStandardDirectory("XDG_CONFIG_HOME", ".config");
+  FilePath config_dir(GetXDGDirectory("XDG_CONFIG_HOME", ".config"));
 #if defined(GOOGLE_CHROME_BUILD)
   *result = config_dir.Append("google-chrome");
 #else
   *result = config_dir.Append("chromium");
 #endif
   return true;
 }
 
 bool GetUserDocumentsDirectory(FilePath* result) {
-  *result = GetStandardDirectory("XDG_DOCUMENTS_DIR", "Documents");
+  *result = GetXDGUserDirectory("DOCUMENTS", "Documents");
   return true;
 }
 
 bool GetUserDesktop(FilePath* result) {
-  *result = GetStandardDirectory("XDG_DESKTOP_DIR", "Desktop");
+  *result = GetXDGUserDirectory("DESKTOP", "Desktop");
   return true;
 }
 
 }  // namespace chrome