base/base_paths_posix.cc

   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::PathProviderPosix, default path provider on POSIX OSes that
   6 // don't have their own base_paths_OS.cc implementation (i.e. all but Mac and
   7 // Android).
   8
   9 #include <ostream>
  10 #include <string>
  11
  12 #include "base/base_paths.h"
  13 #include "base/environment.h"
  14 #include "base/files/file_path.h"
  15 #include "base/files/file_util.h"
  16 #include "base/logging.h"
  17 #include "base/memory/scoped_ptr.h"
  18 #include "base/nix/xdg_util.h"
  19 #include "base/path_service.h"
  20 #include "base/process/process_metrics.h"
  21 #include "build/build_config.h"
  22
  23 #if defined(OS_FREEBSD)
  24 #include <sys/param.h>
  25 #include <sys/sysctl.h>
  26 #elif defined(OS_SOLARIS)
  27 #include <stdlib.h>
  28 #endif
  29
  30 namespace base {
  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       FilePath bin_dir;
  39       if (!ReadSymbolicLink(FilePath(kProcSelfExe), &bin_dir)) {
  40         NOTREACHED() << "Unable to resolve " << kProcSelfExe << ".";
  41         return false;
  42       }
  43       *result = bin_dir;
  44       return true;
  45 #elif defined(OS_FREEBSD)
  46       int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
  47       char bin_dir[PATH_MAX + 1];
  48       size_t length = sizeof(bin_dir);
  49       // Upon return, |length| is the number of bytes written to |bin_dir|
  50       // including the string terminator.
  51       int error = sysctl(name, 4, bin_dir, &length, NULL, 0);
  52       if (error < 0 || length <= 1) {
  53         NOTREACHED() << "Unable to resolve path.";
  54         return false;
  55       }
  56       *result = FilePath(FilePath::StringType(bin_dir, length - 1));
  57       return true;
  58 #elif defined(OS_SOLARIS)
  59       char bin_dir[PATH_MAX + 1];
  60       if (realpath(getexecname(), bin_dir) == NULL) {
  61         NOTREACHED() << "Unable to resolve " << getexecname() << ".";
  62         return false;
  63       }
  64       *result = FilePath(bin_dir);
  65       return true;
  66 #elif defined(OS_OPENBSD)
  67       // There is currently no way to get the executable path on OpenBSD
  68       char* cpath;
  69       if ((cpath = getenv("CHROME_EXE_PATH")) != NULL)
  70         *result = FilePath(cpath);
  71       else
  72         *result = FilePath("/usr/local/chrome/chrome");
  73       return true;
  74 #endif
  75     }
  76     case base::DIR_SOURCE_ROOT: {
  77       // Allow passing this in the environment, for more flexibility in build
  78       // tree configurations (sub-project builds, gyp --output_dir, etc.)
  79       scoped_ptr<base::Environment> env(base::Environment::Create());
  80       std::string cr_source_root;
  81       if (env->GetVar("CR_SOURCE_ROOT", &cr_source_root)) {
  82         path = FilePath(cr_source_root);
  83         if (base::PathExists(path)) {
  84           *result = path;
  85           return true;
  86         } else {
  87           DLOG(WARNING) << "CR_SOURCE_ROOT is set, but it appears to not "
  88                         << "point to a directory.";
  89         }
  90       }
  91       // On POSIX, unit tests execute two levels deep from the source root.
  92       // For example:  out/{Debug|Release}/net_unittest
  93       if (PathService::Get(base::DIR_EXE, &path)) {
  94         *result = path.DirName().DirName();
  95         return true;
  96       }
  97
  98       DLOG(ERROR) << "Couldn't find your source root.  "
  99                   << "Try running from your chromium/src directory.";
 100       return false;
 101     }
 102     case base::DIR_USER_DESKTOP:
 103       *result = base::nix::GetXDGUserDirectory("DESKTOP", "Desktop");
 104       return true;
 105     case base::DIR_CACHE: {
 106       scoped_ptr<base::Environment> env(base::Environment::Create());
 107       FilePath cache_dir(base::nix::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
 108                                                     ".cache"));
 109       *result = cache_dir;
 110       return true;
 111     }
 112   }
 113   return false;
 114 }
 115
 116 }  // namespace base