1 // Copyright (c) 2011 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 <ostream>
8 #include <string>
9
10 #include "build/build_config.h"
11 #include "base/environment.h"
12 #include "base/file_path.h"
13 #include "base/file_util.h"
14 #include "base/logging.h"
15 #include "base/memory/scoped_ptr.h"
16 #include "base/path_service.h"
17 #include "base/nix/xdg_util.h"
18
19 #if defined(OS_FREEBSD)
20 #include <sys/param.h>
21 #include <sys/sysctl.h>
22 #endif
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 // The name of this file relative to the source root. This is used for checking
33 // that the source checkout is in the correct place.
34 static const char kThisSourceFile[] = "base/base_paths_linux.cc";
35
PathProviderPosix(int key,FilePath * result)36 bool PathProviderPosix(int key, FilePath* result) {
37 FilePath path;
38 switch (key) {
39 case base::FILE_EXE:
40 case base::FILE_MODULE: { // TODO(evanm): is this correct?
41 #if defined(OS_LINUX)
42 FilePath bin_dir;
43 if (!file_util::ReadSymbolicLink(FilePath(kSelfExe), &bin_dir)) {
44 NOTREACHED() << "Unable to resolve " << kSelfExe << ".";
45 return false;
46 }
47 *result = bin_dir;
48 return true;
49 #elif defined(OS_FREEBSD)
50 int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
51 char bin_dir[PATH_MAX + 1];
52 size_t length = sizeof(bin_dir);
53 int error = sysctl(name, 4, bin_dir, &length, NULL, 0);
54 if (error < 0 || length == 0 || strlen(bin_dir) == 0) {
55 NOTREACHED() << "Unable to resolve path.";
56 return false;
57 }
58 bin_dir[strlen(bin_dir)] = 0;
59 *result = FilePath(bin_dir);
60 return true;
61 #endif
62 }
63 case base::DIR_SOURCE_ROOT: {
64 // Allow passing this in the environment, for more flexibility in build
65 // tree configurations (sub-project builds, gyp --output_dir, etc.)
66 scoped_ptr<base::Environment> env(base::Environment::Create());
67 std::string cr_source_root;
68 if (env->GetVar("CR_SOURCE_ROOT", &cr_source_root)) {
69 path = FilePath(cr_source_root);
70 if (file_util::PathExists(path.Append(kThisSourceFile))) {
71 *result = path;
72 return true;
73 } else {
74 LOG(WARNING) << "CR_SOURCE_ROOT is set, but it appears to not "
75 << "point to the correct source root directory.";
76 }
77 }
78 // On POSIX, unit tests execute two levels deep from the source root.
79 // For example: out/{Debug|Release}/net_unittest
80 if (PathService::Get(base::DIR_EXE, &path)) {
81 path = path.DirName().DirName();
82 if (file_util::PathExists(path.Append(kThisSourceFile))) {
83 *result = path;
84 return true;
85 }
86 }
87 // In a case of WebKit-only checkout, executable files are put into
88 // <root of checkout>/out/{Debug|Release}, and we should return
89 // <root of checkout>/Source/WebKit/chromium for DIR_SOURCE_ROOT.
90 if (PathService::Get(base::DIR_EXE, &path)) {
91 path = path.DirName().DirName().Append("Source/WebKit/chromium");
92 if (file_util::PathExists(path.Append(kThisSourceFile))) {
93 *result = path;
94 return true;
95 }
96 }
97 // If that failed (maybe the build output is symlinked to a different
98 // drive) try assuming the current directory is the source root.
99 if (file_util::GetCurrentDirectory(&path) &&
100 file_util::PathExists(path.Append(kThisSourceFile))) {
101 *result = path;
102 return true;
103 }
104 LOG(ERROR) << "Couldn't find your source root. "
105 << "Try running from your chromium/src directory.";
106 return false;
107 }
108 case base::DIR_CACHE:
109 #ifdef ANDROID
110 NOTREACHED();
111 return false;
112 #else
113 scoped_ptr<base::Environment> env(base::Environment::Create());
114 FilePath cache_dir(base::nix::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
115 ".cache"));
116 *result = cache_dir;
117 return true;
118 #endif
119 }
120 return false;
121 }
122
123 } // namespace base
124