blob: 4f522edc6ee408b9615aeec8359c3224f40511a4 [file] [log] [blame]
// Copyright 2023 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "init/startup/factory_mode_mount_helper.h"
#include <sys/mount.h>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <base/files/file_path.h>
#include <base/files/file_util.h>
#include <base/logging.h>
#include <base/values.h>
#include <libstorage/platform/platform.h>
#include "init/startup/flags.h"
#include "init/startup/mount_helper.h"
#include "init/startup/startup_dep_impl.h"
namespace {
constexpr char kOptionsFile[] =
"dev_image/factory/init/encstateful_mount_option";
constexpr char kVar[] = "var";
constexpr char kHomeChronos[] = "home/chronos";
} // namespace
namespace startup {
// Constructor for FactoryModeMountHelper when the device is
// in factory mode.
FactoryModeMountHelper::FactoryModeMountHelper(libstorage::Platform* platform,
StartupDep* startup_dep,
const Flags& flags,
const base::FilePath& root,
const base::FilePath& stateful)
: MountHelper(platform, startup_dep, flags, root, stateful) {}
bool FactoryModeMountHelper::DoMountVarAndHomeChronos() {
base::FilePath option_file = stateful_.Append(kOptionsFile);
std::string option = "";
if (platform_->FileExists(option_file)) {
platform_->ReadFileToString(option_file, &option);
}
if (option == "tmpfs") {
// Mount tmpfs to /var/. When booting from USB disk, writing to /var/
// slows down system performance dramatically. Since there is no need to
// really write to stateful partition, using option 'tmpfs' will mount
// tmpfs on /var to improve performance. (especially when running
// tests like touchpad, touchscreen).
base::FilePath var = root_.Append(kVar);
if (!platform_->Mount(base::FilePath("tmpfs_var"), var, "tmpfs", 0, "")) {
return false;
}
base::FilePath stateful_home_chronos = stateful_.Append(kHomeChronos);
base::FilePath home_chronos = root_.Append(kHomeChronos);
if (!platform_->Mount(stateful_home_chronos, home_chronos, "", MS_BIND,
"")) {
return false;
}
return true;
}
// Mount /var and /home/chronos in the unencrypted mode.
return MountVarAndHomeChronosUnencrypted();
}
} // namespace startup