init/util.h

/*
 * Copyright (C) 2010 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.
 */

#pragma once

#include <sys/stat.h>
#include <sys/types.h>
#include <sys/unistd.h>

#include <chrono>
#include <functional>
#include <string>
#include <vector>

#include <android-base/chrono_utils.h>

#include "fscrypt_init_extensions.h"
#include "result.h"

using android::base::boot_clock;

namespace android {
namespace init {

enum mount_mode {
    MOUNT_MODE_DEFAULT = 0,
    MOUNT_MODE_EARLY = 1,
    MOUNT_MODE_LATE = 2,
};

static const char kColdBootDoneProp[] = "ro.cold_boot_done";

extern void (*trigger_shutdown)(const std::string& command);

Result<int> CreateSocket(const std::string& name, int type, bool passcred, bool should_listen,
                         mode_t perm, uid_t uid, gid_t gid, const std::string& socketcon);

Result<std::string> ReadFile(const std::string& path);
Result<void> WriteFile(const std::string& path, const std::string& content);

Result<uid_t> DecodeUid(const std::string& name);

bool mkdir_recursive(const std::string& pathname, mode_t mode);
int wait_for_file(const char* filename, std::chrono::nanoseconds timeout);
bool make_dir(const std::string& path, mode_t mode);
bool is_dir(const char* pathname);
Result<std::string> ExpandProps(const std::string& src);

// Reads or compares the content of device tree file under the platform's Android DT directory.
bool read_android_dt_file(const std::string& sub_path, std::string* dt_content);
bool is_android_dt_value_expected(const std::string& sub_path, const std::string& expected_content);

bool IsLegalPropertyName(const std::string& name);
Result<void> IsLegalPropertyValue(const std::string& name, const std::string& value);
std::string CleanDirPath(const std::string& path);

struct MkdirOptions {
    std::string target;
    mode_t mode;
    uid_t uid;
    gid_t gid;
    FscryptAction fscrypt_action;
    std::string ref_option;
};

Result<MkdirOptions> ParseMkdir(const std::vector<std::string>& args);

struct MountAllOptions {
    std::vector<std::string> rc_paths;
    std::string fstab_path;
    mount_mode mode;
    bool import_rc;
};

Result<MountAllOptions> ParseMountAll(const std::vector<std::string>& args);

Result<std::pair<int, std::vector<std::string>>> ParseRestorecon(
        const std::vector<std::string>& args);

Result<std::string> ParseSwaponAll(const std::vector<std::string>& args);

Result<std::string> ParseUmountAll(const std::vector<std::string>& args);

void SetStdioToDevNull(char** argv);
void InitKernelLogging(char** argv);
bool IsRecoveryMode();

bool IsDefaultMountNamespaceReady();
void SetDefaultMountNamespaceReady();

inline constexpr bool IsMicrodroid() {
#ifdef MICRODROID
    return MICRODROID;
#else
    return false;
#endif
}

inline bool IsArcvm() {
    return !access("/is_arcvm", F_OK);
}

bool Has32BitAbi();

std::string GetApexNameFromFileName(const std::string& path);

// Compare all files */path.#rc and */path.rc with the same path prefix.
// Keep the one with the highest # that doesn't exceed the system's SDK.
// (.rc == .0rc for ranking purposes)
std::vector<std::string> FilterVersionedConfigs(const std::vector<std::string>& configs,
                                                  int active_sdk);

// Forks, executes the provided program in the child, and waits for the completion in the parent.
// Child's stderr is captured and logged using LOG(ERROR).
bool ForkExecveAndWaitForCompletion(const char* filename, char* const argv[]);

}  // namespace init
}  // namespace android