base/base_paths_posix.cc

   1 // Copyright (c) 2010 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 // This is really Posix minus Mac. Mac code is in base_paths_mac.mm.
   6
   7 #include "base/base_paths.h"
   8
   9 #include <unistd.h>
  10 #if defined(OS_FREEBSD)
  11 #include <sys/param.h>
  12 #include <sys/sysctl.h>
  13 #endif
  14
  15 #include "base/environment.h"
  16 #include "base/file_path.h"
  17 #include "base/file_util.h"
  18 #include "base/logging.h"
  19 #include "base/path_service.h"
  20 #include "base/scoped_ptr.h"
  21 #include "base/sys_string_conversions.h"
  22 #include "base/xdg_util.h"
  23
  24 namespace base {
  25
  26 #if defined(OS_LINUX)
  27 const char kSelfExe[] = "/proc/self/exe";
  28 #elif defined(OS_SOLARIS)
  29 const char kSelfExe[] = getexecname();
  30 #endif
  31
  32 bool PathProviderPosix(int key, FilePath* result) {
  33   FilePath path;
  34   switch (key) {
  35     case base::FILE_EXE:
  36     case base::FILE_MODULE: {  // TODO(evanm): is this correct?
  37 #if defined(OS_LINUX)
  38       char bin_dir[PATH_MAX + 1];
  39       int bin_dir_size = readlink(kSelfExe, bin_dir, PATH_MAX);
  40       if (bin_dir_size < 0 || bin_dir_size > PATH_MAX) {
  41         NOTREACHED() << "Unable to resolve " << kSelfExe << ".";
  42         return false;
  43       }
  44       bin_dir[bin_dir_size] = 0;
  45       *result = FilePath(bin_dir);
  46       return true;
  47 #elif defined(OS_FREEBSD)
  48       int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
  49       char bin_dir[PATH_MAX + 1];
  50       size_t length = sizeof(bin_dir);
  51       int error = sysctl(name, 4, bin_dir, &length, NULL, 0);
  52       if (error < 0 || length == 0 || strlen(bin_dir) == 0) {
  53         NOTREACHED() << "Unable to resolve path.";
  54         return false;
  55       }
  56       bin_dir[strlen(bin_dir)] = 0;
  57       *result = FilePath(bin_dir);
  58       return true;
  59 #endif
  60     }
  61     case base::DIR_SOURCE_ROOT: {
  62       // Allow passing this in the environment, for more flexibility in build
  63       // tree configurations (sub-project builds, gyp --output_dir, etc.)
  64       scoped_ptr<base::Environment> env(base::Environment::Create());
  65       std::string cr_source_root;
  66       if (env->GetVar("CR_SOURCE_ROOT", &cr_source_root)) {
  67         path = FilePath(cr_source_root);
  68         if (file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
  69           *result = path;
  70           return true;
  71         } else {
  72           LOG(WARNING) << "CR_SOURCE_ROOT is set, but it appears to not "
  73                        << "point to the correct source root directory.";
  74         }
  75       }
  76       // On POSIX, unit tests execute two levels deep from the source root.
  77       // For example:  sconsbuild/{Debug|Release}/net_unittest
  78       if (PathService::Get(base::DIR_EXE, &path)) {
  79         path = path.DirName().DirName();
  80         if (file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
  81           *result = path;
  82           return true;
  83         }
  84       }
  85       // In a case of WebKit-only checkout, executable files are put into
  86       // WebKit/out/{Debug|Release}, and we should return WebKit/WebKit/chromium
  87       // for DIR_SOURCE_ROOT.
  88       if (PathService::Get(base::DIR_EXE, &path)) {
  89         path = path.DirName().DirName().Append("WebKit/chromium");
  90         if (file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
  91           *result = path;
  92           return true;
  93         }
  94       }
  95       // If that failed (maybe the build output is symlinked to a different
  96       // drive) try assuming the current directory is the source root.
  97       if (file_util::GetCurrentDirectory(&path) &&
  98           file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
  99         *result = path;
 100         return true;
 101       }
 102       LOG(ERROR) << "Couldn't find your source root.  "
 103                  << "Try running from your chromium/src directory.";
 104       return false;
 105     }
 106     case base::DIR_USER_CACHE:
 107       scoped_ptr<base::Environment> env(base::Environment::Create());
 108       FilePath cache_dir(base::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
 109                                                ".cache"));
 110       *result = cache_dir;
 111       return true;
 112   }
 113   return false;
 114 }
 115
 116 }  // namespace base