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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef _WIN32
#include <android-base/utf8.h>
#include <direct.h>
#include <shlobj.h>
#else
#include <pwd.h>
#endif
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <unistd.h>
#include <vector>
#include "filesystem.h"
namespace {
int LockFile(int fd) {
#ifdef _WIN32
HANDLE handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
OVERLAPPED overlapped = {};
const BOOL locked =
LockFileEx(handle, LOCKFILE_EXCLUSIVE_LOCK, 0, MAXDWORD, MAXDWORD, &overlapped);
return locked ? 0 : -1;
#else
return flock(fd, LOCK_EX);
#endif
}
} // namespace
// inspired by adb implementation:
// cs.android.com/android/platform/superproject/+/master:packages/modules/adb/adb_utils.cpp;l=275
std::string GetHomeDirPath() {
#ifdef _WIN32
WCHAR path[MAX_PATH];
const HRESULT hr = SHGetFolderPathW(NULL, CSIDL_PROFILE, NULL, 0, path);
if (FAILED(hr)) {
return {};
}
std::string home_str;
if (!android::base::WideToUTF8(path, &home_str)) {
return {};
}
return home_str;
#else
if (const char* const home = getenv("HOME")) {
return home;
}
struct passwd pwent;
struct passwd* result;
int pwent_max = sysconf(_SC_GETPW_R_SIZE_MAX);
if (pwent_max == -1) {
pwent_max = 16384;
}
std::vector<char> buf(pwent_max);
int rc = getpwuid_r(getuid(), &pwent, buf.data(), buf.size(), &result);
if (rc == 0 && result) {
return result->pw_dir;
}
#endif
return {};
}
bool FileExists(const std::string& path) {
return access(path.c_str(), F_OK) == 0;
}
bool EnsureDirectoryExists(const std::string& directory_path) {
const int result =
#ifdef _WIN32
_mkdir(directory_path.c_str());
#else
mkdir(directory_path.c_str(), S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
#endif
return result == 0 || errno == EEXIST;
}
FileLock::FileLock(const std::string& path) : fd_(open(path.c_str(), O_CREAT | O_WRONLY, 0644)) {
if (LockFile(fd_.get()) != 0) {
LOG(FATAL) << "Failed to acquire a lock on " << path;
}
}
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