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141 lines (112 loc) · 3.45 KB
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/**
* Copyright 2022 Google Inc. All Rights Reserved.
*
* 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.
*/
#include "file_utils.h"
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fstream>
#include "src/agent/common.h"
#include "gtest/gtest.h"
namespace devtools {
namespace cdbg {
namespace {
// Done using the C library, as std::filesystem was introduced in C++17, and
// we're still targetting building with C++11.
void remove_all_files_and_dirs(const std::string& path) {
DIR* dir;
struct dirent* ent;
dir = opendir(path.c_str());
PCHECK(dir != nullptr) << ", directory: " << path;
while ((ent = readdir(dir)) != NULL) {
std::string ent_name = std::string(ent->d_name);
if (ent_name == "." || ent_name == "..") {
continue;
}
std::string ent_full_path_name = path + "/" + ent_name;
if (ent->d_type == DT_DIR) {
remove_all_files_and_dirs(ent_full_path_name);
} else {
PCHECK(unlink(ent_full_path_name.c_str()) == 0)
<< ", path: " << ent_full_path_name;
}
}
closedir(dir);
PCHECK(rmdir(path.c_str()) == 0) << ", directory name: " << path;
}
} // namespace
/**
* Small utility to wrap a c string and manage its memory. Needed for the call
* to mkdtemp, which requires a writeable c string.
*
* To note, the value returned from the c_str() and data methods of std::string
* are not useable usabled as is, because in C++11 they both return const char*,
* so are not writable.
*/
class CString {
public:
CString(std::string str) {
c_str_.reset(strdup(str.c_str()));
PCHECK(c_str_.get() != nullptr);
}
char* c_str() { return c_str_.get(); }
private:
struct free_deleter {
void operator()(void* x) { free(x); }
};
std::unique_ptr<char, free_deleter> c_str_;
};
TempPath::TempPath() {
CString temp_path(::testing::TempDir() + "/cdbg-temp.XXXXXX");
char* retval = mkdtemp(temp_path.c_str());
PCHECK(retval != nullptr);
temp_path_ = std::string(temp_path.c_str());
}
TempPath::~TempPath() {
if (temp_path_ == "") {
return;
}
remove_all_files_and_dirs(temp_path_);
temp_path_ = "";
}
std::string TempPath::path() const { return temp_path_; }
bool SetFileContents(const std::string& filename, const std::string& data) {
try {
std::ofstream out(filename);
out << data;
} catch (std::exception& e) {
LOG(ERROR) << "Error opening/writting to " << filename << ", " << e.what();
return false;
}
return true;
}
bool GetFileContents(const std::string& filename, std::string* data) {
try {
std::ifstream in(filename);
std::stringstream buffer;
buffer << in.rdbuf();
*data = buffer.str();
} catch (std::exception& e) {
LOG(ERROR) << "Error opening/reading from " << filename << ", " << e.what();
return false;
}
return true;
}
std::string JoinPath(const std::string& path, const std::string& filename) {
return path + '/' + filename;
}
} // namespace cdbg
} // namespace devtools