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91 lines
2.9 KiB
91 lines
2.9 KiB
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "cpio.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <vector>
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#include <android-base/logging.h>
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#include <android-base/strings.h>
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using android::base::ErrnoError;
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using android::base::Error;
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using android::base::Join;
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namespace android {
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namespace {
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std::vector<char*> ToCStringArray(std::vector<std::string>* args) {
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std::vector<char*> ret;
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ret.reserve(args->size() + 1);
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for (auto& arg : *args) {
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ret.push_back(arg.data());
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}
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ret.push_back(nullptr);
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return ret;
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}
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// Wrapper of fork() / execvp() / wait() paradigm. Child process chdir() into
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// the directory before execv()
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android::base::Result<void> Exec(std::vector<std::string>* args,
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std::string_view working_directory) {
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pid_t pid = fork();
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if (pid == -1)
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return ErrnoError() << "Unable to execute `" << Join(*args, " ")
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<< "`: failed to fork";
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if (pid == 0) {
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// child process
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CHECK(0 == chdir(working_directory.data())) << strerror(errno);
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// execvp needs char*, so copy the strings to heap.
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auto c_args = ToCStringArray(args);
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(void)close(STDIN_FILENO);
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(void)execvp(c_args[0], c_args.data());
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// execvp only returns on error.
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PLOG(FATAL) << "Unable to execute `" << Join(*args, " ")
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<< "`: execvp returns";
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}
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// parent process
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int status;
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if (pid != waitpid(pid, &status, 0))
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return ErrnoError() << "Unable to execute `" << Join(*args, " ")
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<< "`; failed to waitpid(" << pid << ")";
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if (!WIFEXITED(status))
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return Error() << "Unable to execute `" << Join(*args, " ")
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<< "`: not exited normally";
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if (0 != WEXITSTATUS(status))
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return Error() << "Unable to execute `" << Join(*args, " ")
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<< "`: exit status " << WEXITSTATUS(status);
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return {};
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}
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} // namespace
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// Extract CPIO archive at |archive_path| to a temporary directory.
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android::base::Result<std::unique_ptr<TemporaryDir>> CpioExtract(
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std::string_view archive_path) {
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std::vector<std::string> args{"cpio", "-i", "-F", archive_path.data()};
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auto extracted_ramdisk = std::make_unique<TemporaryDir>();
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auto res = Exec(&args, extracted_ramdisk->path);
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if (!res.ok()) return res.error();
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return extracted_ramdisk;
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}
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} // namespace android
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