base_paths_linux.cc revision 72a454cd3513ac24fbdd0e0cb9ad70b86a99b801 
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#include "base/base_paths.h"
6
7#include <unistd.h>
8#if defined(OS_FREEBSD)
9#include <sys/param.h>
10#include <sys/sysctl.h>
11#endif
12
13#include "base/environment.h"
14#include "base/file_path.h"
15#include "base/file_util.h"
16#include "base/logging.h"
17#include "base/path_service.h"
18#include "base/scoped_ptr.h"
19#include "base/sys_string_conversions.h"
20#include "base/nix/xdg_util.h"
21
22namespace base {
23
24#if defined(OS_LINUX)
25const char kSelfExe[] = "/proc/self/exe";
26#elif defined(OS_SOLARIS)
27const char kSelfExe[] = getexecname();
28#endif
29
30// The name of this file relative to the source root. This is used for checking
31// that the source checkout is in the correct place.
32static const char kThisSourceFile[] = "base/base_paths_linux.cc";
33
34bool PathProviderPosix(int key, FilePath* result) {
35  FilePath path;
36  switch (key) {
37    case base::FILE_EXE:
38    case base::FILE_MODULE: {  // TODO(evanm): is this correct?
39#if defined(OS_LINUX)
40      FilePath bin_dir;
41      if (!file_util::ReadSymbolicLink(FilePath(kSelfExe), &bin_dir)) {
42        NOTREACHED() << "Unable to resolve " << kSelfExe << ".";
43        return false;
44      }
45      *result = 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(kThisSourceFile))) {
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:  out/{Debug|Release}/net_unittest
78      if (PathService::Get(base::DIR_EXE, &path)) {
79        path = path.DirName().DirName();
80        if (file_util::PathExists(path.Append(kThisSourceFile))) {
81          *result = path;
82          return true;
83        }
84      }
85      // In a case of WebKit-only checkout, executable files are put into
86      // <root of checkout>/out/{Debug|Release}, and we should return
87      // <root of checkout>/Source/WebKit/chromium for DIR_SOURCE_ROOT.
88      if (PathService::Get(base::DIR_EXE, &path)) {
89        path = path.DirName().DirName().Append("Source/WebKit/chromium");
90        if (file_util::PathExists(path.Append(kThisSourceFile))) {
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(kThisSourceFile))) {
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_CACHE:
107#ifdef ANDROID
108      NOTREACHED();
109      return false;
110#else
111      scoped_ptr<base::Environment> env(base::Environment::Create());
112      FilePath cache_dir(base::nix::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
113                                                    ".cache"));
114      *result = cache_dir;
115      return true;
116#endif
117  }
118  return false;
119}
120
121}  // namespace base
122