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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/base_paths.h"
#include <ostream>
#include <string>
#include "build/build_config.h"
#include "base/environment.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/path_service.h"
#include "base/nix/xdg_util.h"
#if defined(OS_FREEBSD)
#include <sys/param.h>
#include <sys/sysctl.h>
#endif
namespace base {
#if defined(OS_LINUX)
const char kSelfExe[] = "/proc/self/exe";
#elif defined(OS_SOLARIS)
const char kSelfExe[] = getexecname();
#endif
// The name of this file relative to the source root. This is used for checking
// that the source checkout is in the correct place.
static const char kThisSourceFile[] = "base/base_paths_linux.cc";
bool PathProviderPosix(int key, FilePath* result) {
FilePath path;
switch (key) {
case base::FILE_EXE:
case base::FILE_MODULE: { // TODO(evanm): is this correct?
#if defined(OS_LINUX)
FilePath bin_dir;
if (!file_util::ReadSymbolicLink(FilePath(kSelfExe), &bin_dir)) {
NOTREACHED() << "Unable to resolve " << kSelfExe << ".";
return false;
}
*result = bin_dir;
return true;
#elif defined(OS_FREEBSD)
int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
char bin_dir[PATH_MAX + 1];
size_t length = sizeof(bin_dir);
int error = sysctl(name, 4, bin_dir, &length, NULL, 0);
if (error < 0 || length == 0 || strlen(bin_dir) == 0) {
NOTREACHED() << "Unable to resolve path.";
return false;
}
bin_dir[strlen(bin_dir)] = 0;
*result = FilePath(bin_dir);
return true;
#endif
}
case base::DIR_SOURCE_ROOT: {
// Allow passing this in the environment, for more flexibility in build
// tree configurations (sub-project builds, gyp --output_dir, etc.)
scoped_ptr<base::Environment> env(base::Environment::Create());
std::string cr_source_root;
if (env->GetVar("CR_SOURCE_ROOT", &cr_source_root)) {
path = FilePath(cr_source_root);
if (file_util::PathExists(path.Append(kThisSourceFile))) {
*result = path;
return true;
} else {
LOG(WARNING) << "CR_SOURCE_ROOT is set, but it appears to not "
<< "point to the correct source root directory.";
}
}
// On POSIX, unit tests execute two levels deep from the source root.
// For example: out/{Debug|Release}/net_unittest
if (PathService::Get(base::DIR_EXE, &path)) {
path = path.DirName().DirName();
if (file_util::PathExists(path.Append(kThisSourceFile))) {
*result = path;
return true;
}
}
// In a case of WebKit-only checkout, executable files are put into
// <root of checkout>/out/{Debug|Release}, and we should return
// <root of checkout>/Source/WebKit/chromium for DIR_SOURCE_ROOT.
if (PathService::Get(base::DIR_EXE, &path)) {
path = path.DirName().DirName().Append("Source/WebKit/chromium");
if (file_util::PathExists(path.Append(kThisSourceFile))) {
*result = path;
return true;
}
}
// If that failed (maybe the build output is symlinked to a different
// drive) try assuming the current directory is the source root.
if (file_util::GetCurrentDirectory(&path) &&
file_util::PathExists(path.Append(kThisSourceFile))) {
*result = path;
return true;
}
LOG(ERROR) << "Couldn't find your source root. "
<< "Try running from your chromium/src directory.";
return false;
}
case base::DIR_CACHE:
#ifdef ANDROID
NOTREACHED();
return false;
#else
scoped_ptr<base::Environment> env(base::Environment::Create());
FilePath cache_dir(base::nix::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
".cache"));
*result = cache_dir;
return true;
#endif
}
return false;
}
} // namespace base
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