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
30namespace base {
31
32bool 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
117