base/base_paths_mac.mm

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Defines base::PathProviderMac which replaces base::PathProviderPosix for Mac
   6 // in base/path_service.cc.
   7
   8 #include <dlfcn.h>
   9 #import <Foundation/Foundation.h>
  10 #include <mach-o/dyld.h>
  11
  12 #include "base/base_paths.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/file_util.h"
  15 #include "base/files/file_path.h"
  16 #include "base/logging.h"
  17 #include "base/mac/foundation_util.h"
  18 #include "base/path_service.h"
  19 #include "base/strings/string_util.h"
  20 #include "build/build_config.h"
  21
  22 namespace {
  23
  24 void GetNSExecutablePath(base::FilePath* path) {
  25   DCHECK(path);
  26   // Executable path can have relative references ("..") depending on
  27   // how the app was launched.
  28   uint32_t executable_length = 0;
  29   _NSGetExecutablePath(NULL, &executable_length);
  30   DCHECK_GT(executable_length, 1u);
  31   std::string executable_path;
  32   int rv = _NSGetExecutablePath(WriteInto(&executable_path, executable_length),
  33                                 &executable_length);
  34   DCHECK_EQ(rv, 0);
  35
  36   // _NSGetExecutablePath may return paths containing ./ or ../ which makes
  37   // FilePath::DirName() work incorrectly, convert it to absolute path so that
  38   // paths such as DIR_SOURCE_ROOT can work, since we expect absolute paths to
  39   // be returned here.
  40   *path = base::MakeAbsoluteFilePath(base::FilePath(executable_path));
  41 }
  42
  43 // Returns true if the module for |address| is found. |path| will contain
  44 // the path to the module. Note that |path| may not be absolute.
  45 bool GetModulePathForAddress(base::FilePath* path,
  46                              const void* address) WARN_UNUSED_RESULT;
  47
  48 bool GetModulePathForAddress(base::FilePath* path, const void* address) {
  49   Dl_info info;
  50   if (dladdr(address, &info) == 0)
  51     return false;
  52   *path = base::FilePath(info.dli_fname);
  53   return true;
  54 }
  55
  56 }  // namespace
  57
  58 namespace base {
  59
  60 bool PathProviderMac(int key, base::FilePath* result) {
  61   switch (key) {
  62     case base::FILE_EXE:
  63       GetNSExecutablePath(result);
  64       return true;
  65     case base::FILE_MODULE:
  66       return GetModulePathForAddress(result,
  67           reinterpret_cast<const void*>(&base::PathProviderMac));
  68     case base::DIR_APP_DATA: {
  69       bool success = base::mac::GetUserDirectory(NSApplicationSupportDirectory,
  70                                                  result);
  71 #if defined(OS_IOS)
  72       // On IOS, this directory does not exist unless it is created explicitly.
  73       if (success && !base::PathExists(*result))
  74         success = file_util::CreateDirectory(*result);
  75 #endif  // defined(OS_IOS)
  76       return success;
  77     }
  78     case base::DIR_SOURCE_ROOT:
  79       // Go through PathService to catch overrides.
  80       if (!PathService::Get(base::FILE_EXE, result))
  81         return false;
  82
  83       // Start with the executable's directory.
  84       *result = result->DirName();
  85
  86 #if !defined(OS_IOS)
  87       if (base::mac::AmIBundled()) {
  88         // The bundled app executables (Chromium, TestShell, etc) live five
  89         // levels down, eg:
  90         // src/xcodebuild/{Debug|Release}/Chromium.app/Contents/MacOS/Chromium
  91         *result = result->DirName().DirName().DirName().DirName().DirName();
  92       } else {
  93         // Unit tests execute two levels deep from the source root, eg:
  94         // src/xcodebuild/{Debug|Release}/base_unittests
  95         *result = result->DirName().DirName();
  96       }
  97 #endif
  98       return true;
  99     case base::DIR_USER_DESKTOP:
 100 #if defined(OS_IOS)
 101       // iOS does not have desktop directories.
 102       NOTIMPLEMENTED();
 103       return false;
 104 #else
 105       return base::mac::GetUserDirectory(NSDesktopDirectory, result);
 106 #endif
 107     case base::DIR_CACHE:
 108       return base::mac::GetUserDirectory(NSCachesDirectory, result);
 109     case base::DIR_HOME:
 110       *result = base::mac::NSStringToFilePath(NSHomeDirectory());
 111       return true;
 112     default:
 113       return false;
 114   }
 115 }
 116
 117 }  // namespace base