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Atmosphere/libraries/libstratosphere/source/fs/fs_code.cpp

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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "fsa/fs_mount_utils.hpp"
#include "impl/fs_file_system_service_object_adapter.hpp"
#include "impl/fs_file_system_proxy_service_object.hpp"
namespace ams::fs {
namespace {
constinit os::SdkMutex g_mount_stratosphere_romfs_lock;
constinit bool g_mounted_stratosphere_romfs = false;
constinit util::TypedStorage<FileHandleStorage> g_stratosphere_romfs_storage = {};
constinit util::TypedStorage<RomFsFileSystem> g_stratosphere_romfs_fs = {};
Result EnsureStratosphereRomfsMounted() {
std::scoped_lock lk(g_mount_stratosphere_romfs_lock);
if (AMS_UNLIKELY(!g_mounted_stratosphere_romfs)) {
/* Mount the SD card. */
R_TRY(fs::MountSdCard("#strat-romfs-sd"));
auto sd_guard = SCOPE_GUARD { fs::Unmount("#strat-romfs-sd"); };
/* Open sd:/atmosphere/stratosphere.romfs. */
fs::FileHandle stratosphere_romfs_file;
R_TRY(fs::OpenFile(std::addressof(stratosphere_romfs_file), "#strat-romfs-sd:/atmosphere/stratosphere.romfs", fs::OpenMode_Read));
/* Setup the storage. */
/* NOTE: This owns the file, and so on failure it will be closed appropriately. */
auto storage_guard = util::ConstructAtGuarded(g_stratosphere_romfs_storage, stratosphere_romfs_file, true);
/* Create the filesystem. */
auto fs_guard = util::ConstructAtGuarded(g_stratosphere_romfs_fs);
/* Initialize the filesystem. */
R_TRY(GetReference(g_stratosphere_romfs_fs).Initialize(GetPointer(g_stratosphere_romfs_storage), nullptr, 0, false));
/* We succeeded, and so stratosphere.romfs is mounted. */
fs_guard.Cancel();
storage_guard.Cancel();
sd_guard.Cancel();
g_mounted_stratosphere_romfs = true;
}
R_SUCCEED();
}
fsa::IFileSystem &GetStratosphereRomFsFileSystem() {
/* Ensure that stratosphere.romfs is mounted. */
/* NOTE: Abort is used here to ensure that atmosphere's filesystem is structurally valid. */
R_ABORT_UNLESS(EnsureStratosphereRomfsMounted());
return GetReference(g_stratosphere_romfs_fs);
}
Result OpenCodeFileSystemImpl(CodeVerificationData *out_verification_data, std::unique_ptr<fsa::IFileSystem> *out, const char *path, ncm::ProgramId program_id) {
/* Print a path suitable for the remote service. */
fssrv::sf::Path sf_path;
R_TRY(FormatToFspPath(std::addressof(sf_path), "%s", path));
/* Open the filesystem. */
auto fsp = impl::GetFileSystemProxyForLoaderServiceObject();
R_TRY(fsp->SetCurrentProcess({}));
sf::SharedPointer<fssrv::sf::IFileSystem> fs;
R_TRY(fsp->OpenCodeFileSystem(std::addressof(fs), out_verification_data, sf_path, program_id));
/* Allocate a new filesystem wrapper. */
auto fsa = std::make_unique<impl::FileSystemServiceObjectAdapter>(std::move(fs));
R_UNLESS(fsa != nullptr, fs::ResultAllocationFailureInCodeA());
*out = std::move(fsa);
R_SUCCEED();
}
Result OpenPackageFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out, const fssrv::sf::FspPath &path) {
/* Open the filesystem. */
auto fsp = impl::GetFileSystemProxyServiceObject();
sf::SharedPointer<fssrv::sf::IFileSystem> fs;
R_TRY(fsp->OpenFileSystemWithId(std::addressof(fs), path, ncm::InvalidProgramId.value, impl::FileSystemProxyType_Package));
/* Allocate a new filesystem wrapper. */
auto fsa = std::make_unique<impl::FileSystemServiceObjectAdapter>(std::move(fs));
R_UNLESS(fsa != nullptr, fs::ResultAllocationFailureInCodeA());
*out = std::move(fsa);
R_SUCCEED();
}
Result OpenSdCardCodeFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out, ncm::ProgramId program_id) {
/* Ensure we don't access the SD card too early. */
R_UNLESS(cfg::IsSdCardInitialized(), fs::ResultSdCardNotPresent());
/* Print a path to the program's package. */
fssrv::sf::Path sf_path;
R_TRY(FormatToFspPath(std::addressof(sf_path), "%s:/atmosphere/contents/%016" PRIx64 "/exefs.nsp", impl::SdCardFileSystemMountName, program_id.value));
R_RETURN(OpenPackageFileSystemImpl(out, sf_path));
}
Result OpenStratosphereCodeFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out, ncm::ProgramId program_id) {
/* Ensure we don't access the SD card too early. */
R_UNLESS(cfg::IsSdCardInitialized(), fs::ResultSdCardNotPresent());
/* Open the program's package. */
std::unique_ptr<fsa::IFile> package_file;
{
/* Get the stratosphere.romfs filesystem. */
auto &romfs_fs = GetStratosphereRomFsFileSystem();
/* Print a path to the program's package. */
fs::Path path;
R_TRY(path.InitializeWithFormat("/atmosphere/contents/%016" PRIx64 "/exefs.nsp", program_id.value));
R_TRY(path.Normalize(fs::PathFlags{}));
/* Open the package within stratosphere.romfs. */
R_TRY(romfs_fs.OpenFile(std::addressof(package_file), path, fs::OpenMode_Read));
}
/* Create a file storage for the program's package. */
auto package_storage = std::make_shared<FileStorage>(std::move(package_file));
R_UNLESS(package_storage != nullptr, fs::ResultAllocationFailureInCodeA());
/* Create a partition filesystem. */
auto package_fs = std::make_unique<fssystem::PartitionFileSystem>();
R_UNLESS(package_fs != nullptr, fs::ResultAllocationFailureInCodeA());
/* Initialize the partition filesystem. */
R_TRY(package_fs->Initialize(package_storage));
*out = std::move(package_fs);
R_SUCCEED();
}
Result OpenSdCardCodeOrStratosphereCodeOrCodeFileSystemImpl(CodeVerificationData *out_verification_data, std::unique_ptr<fsa::IFileSystem> *out, const char *path, ncm::ProgramId program_id) {
/* If we can open an sd card code fs, use it. */
R_SUCCEED_IF(R_SUCCEEDED(OpenSdCardCodeFileSystemImpl(out, program_id)));
/* If we can open a stratosphere code fs, use it. */
R_SUCCEED_IF(R_SUCCEEDED(OpenStratosphereCodeFileSystemImpl(out, program_id)));
/* Otherwise, fall back to a normal code fs. */
R_RETURN(OpenCodeFileSystemImpl(out_verification_data, out, path, program_id));
}
Result OpenHblCodeFileSystemImpl(std::unique_ptr<fsa::IFileSystem> *out) {
/* Get the HBL path. */
const char *hbl_path = cfg::GetHblPath();
/* Print a path to the hbl package. */
fssrv::sf::Path sf_path;
R_TRY(FormatToFspPath(std::addressof(sf_path), "%s:/%s", impl::SdCardFileSystemMountName, hbl_path[0] == '/' ? hbl_path + 1 : hbl_path));
R_RETURN(OpenPackageFileSystemImpl(out, sf_path));
}
Result OpenSdCardFileSystemImpl(std::shared_ptr<fsa::IFileSystem> *out) {
/* Open the SD card filesystem. */
auto fsp = impl::GetFileSystemProxyServiceObject();
sf::SharedPointer<fssrv::sf::IFileSystem> fs;
R_TRY(fsp->OpenSdCardFileSystem(std::addressof(fs)));
/* Allocate a new filesystem wrapper. */
auto fsa = std::make_shared<impl::FileSystemServiceObjectAdapter>(std::move(fs));
R_UNLESS(fsa != nullptr, fs::ResultAllocationFailureInCodeA());
*out = std::move(fsa);
R_SUCCEED();
}
class OpenFileOnlyFileSystem : public fsa::IFileSystem, public impl::Newable {
private:
virtual Result DoCommit() override final {
R_SUCCEED();
}
virtual Result DoOpenDirectory(std::unique_ptr<fsa::IDirectory> *out_dir, const fs::Path &path, OpenDirectoryMode mode) override final {
AMS_UNUSED(out_dir, path, mode);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoGetEntryType(DirectoryEntryType *out, const fs::Path &path) override final {
AMS_UNUSED(out, path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoCreateFile(const fs::Path &path, s64 size, int flags) override final {
AMS_UNUSED(path, size, flags);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoDeleteFile(const fs::Path &path) override final {
AMS_UNUSED(path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoCreateDirectory(const fs::Path &path) override final {
AMS_UNUSED(path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoDeleteDirectory(const fs::Path &path) override final {
AMS_UNUSED(path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoDeleteDirectoryRecursively(const fs::Path &path) override final {
AMS_UNUSED(path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoRenameFile(const fs::Path &old_path, const fs::Path &new_path) override final {
AMS_UNUSED(old_path, new_path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoRenameDirectory(const fs::Path &old_path, const fs::Path &new_path) override final {
AMS_UNUSED(old_path, new_path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoCleanDirectoryRecursively(const fs::Path &path) override final {
AMS_UNUSED(path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoGetFreeSpaceSize(s64 *out, const fs::Path &path) override final {
AMS_UNUSED(out, path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoGetTotalSpaceSize(s64 *out, const fs::Path &path) override final {
AMS_UNUSED(out, path);
R_THROW(fs::ResultUnsupportedOperation());
}
virtual Result DoCommitProvisionally(s64 counter) override final {
AMS_UNUSED(counter);
R_THROW(fs::ResultUnsupportedOperation());
}
};
class SdCardRedirectionCodeFileSystem : public OpenFileOnlyFileSystem {
private:
util::optional<ReadOnlyFileSystem> m_sd_content_fs;
ReadOnlyFileSystem m_code_fs;
bool m_is_redirect;
public:
SdCardRedirectionCodeFileSystem(std::unique_ptr<fsa::IFileSystem> &&code, ncm::ProgramId program_id, bool redirect) : m_code_fs(std::move(code)), m_is_redirect(redirect) {
if (!cfg::IsSdCardInitialized()) {
return;
}
/* Open an SD card filesystem. */
std::shared_ptr<fsa::IFileSystem> sd_fs;
if (R_FAILED(OpenSdCardFileSystemImpl(std::addressof(sd_fs)))) {
return;
}
/* Create a redirection filesystem to the relevant content folder. */
auto subdir_fs = std::make_unique<fssystem::SubDirectoryFileSystem>(std::move(sd_fs));
if (subdir_fs == nullptr) {
return;
}
fs::Path path;
R_ABORT_UNLESS(path.InitializeWithFormat("/atmosphere/contents/%016" PRIx64 "/exefs", program_id.value));
R_ABORT_UNLESS(path.Normalize(fs::PathFlags{}));
R_ABORT_UNLESS(subdir_fs->Initialize(path));
m_sd_content_fs.emplace(std::move(subdir_fs));
}
private:
bool IsFileStubbed(const fs::Path &path) {
/* If we don't have an sd content fs, nothing is stubbed. */
if (!m_sd_content_fs) {
return false;
}
/* Create a path representing the stub. */
fs::Path stub_path;
if (R_FAILED(stub_path.InitializeWithFormat("%s.stub", path.GetString()))) {
return false;
}
if (R_FAILED(stub_path.Normalize(fs::PathFlags{}))) {
return false;
}
/* Query whether we have the file. */
bool has_file;
if (R_FAILED(fssystem::HasFile(std::addressof(has_file), std::addressof(*m_sd_content_fs), stub_path))) {
return false;
}
return has_file;
}
virtual Result DoOpenFile(std::unique_ptr<fsa::IFile> *out_file, const fs::Path &path, OpenMode mode) override final {
/* Only allow opening files with mode = read. */
R_UNLESS((mode & fs::OpenMode_All) == fs::OpenMode_Read, fs::ResultInvalidOpenMode());
/* If we support redirection, we'd like to prefer a file from the sd card. */
if (m_is_redirect) {
R_SUCCEED_IF(R_SUCCEEDED(m_sd_content_fs->OpenFile(out_file, path, mode)));
}
/* Otherwise, check if the file is stubbed. */
R_UNLESS(!this->IsFileStubbed(path), fs::ResultPathNotFound());
/* Open a file from the base code fs. */
R_RETURN(m_code_fs.OpenFile(out_file, path, mode));
}
};
class AtmosphereCodeFileSystem : public OpenFileOnlyFileSystem {
private:
util::optional<SdCardRedirectionCodeFileSystem> m_code_fs;
util::optional<ReadOnlyFileSystem> m_hbl_fs;
ncm::ProgramId m_program_id;
bool m_initialized;
public:
AtmosphereCodeFileSystem() : m_initialized(false) { /* ... */ }
Result Initialize(CodeVerificationData *out_verification_data, const char *path, ncm::ProgramId program_id, bool is_hbl, bool is_specific) {
AMS_ABORT_UNLESS(!m_initialized);
/* If we're hbl, we need to open a hbl fs. */
if (is_hbl) {
std::unique_ptr<fsa::IFileSystem> fsa;
R_TRY(OpenHblCodeFileSystemImpl(std::addressof(fsa)));
m_hbl_fs.emplace(std::move(fsa));
}
/* Open the code filesystem. */
std::unique_ptr<fsa::IFileSystem> fsa;
R_TRY(OpenSdCardCodeOrStratosphereCodeOrCodeFileSystemImpl(out_verification_data, std::addressof(fsa), path, program_id));
m_code_fs.emplace(std::move(fsa), program_id, is_specific);
m_program_id = program_id;
m_initialized = true;
R_SUCCEED();
}
private:
virtual Result DoOpenFile(std::unique_ptr<fsa::IFile> *out_file, const fs::Path &path, OpenMode mode) override final {
/* Ensure that we're initialized. */
R_UNLESS(m_initialized, fs::ResultNotInitialized());
/* Only allow opening files with mode = read. */
R_UNLESS((mode & fs::OpenMode_All) == fs::OpenMode_Read, fs::ResultInvalidOpenMode());
/* First, check if there's an external code. */
{
fsa::IFileSystem *ecs = fssystem::GetExternalCodeFileSystem(m_program_id);
if (ecs != nullptr) {
R_RETURN(ecs->OpenFile(out_file, path, mode));
}
}
/* If we're hbl, open from the hbl fs. */
if (m_hbl_fs) {
R_RETURN(m_hbl_fs->OpenFile(out_file, path, mode));
}
/* If we're not hbl, fall back to our code filesystem. */
R_RETURN(m_code_fs->OpenFile(out_file, path, mode));
}
};
}
Result MountCode(CodeVerificationData *out, const char *name, const char *path, ncm::ProgramId program_id) {
auto mount_impl = [=]() -> Result {
/* Clear the output. */
std::memset(out, 0, sizeof(*out));
/* Validate the mount name. */
R_TRY(impl::CheckMountName(name));
/* Validate the path isn't null. */
R_UNLESS(path != nullptr, fs::ResultInvalidPath());
/* Open the code file system. */
std::unique_ptr<fsa::IFileSystem> fsa;
R_TRY(OpenCodeFileSystemImpl(out, std::addressof(fsa), path, program_id));
/* Register. */
R_RETURN(fsa::Register(name, std::move(fsa)));
};
/* Perform the mount. */
AMS_FS_R_TRY(AMS_FS_IMPL_ACCESS_LOG_SYSTEM_MOUNT(mount_impl(), name, AMS_FS_IMPL_ACCESS_LOG_FORMAT_MOUNT_CODE(name, path, program_id)));
/* Enable access logging. */
AMS_FS_IMPL_ACCESS_LOG_SYSTEM_FS_ACCESSOR_ENABLE(name);
R_SUCCEED();
}
Result MountCodeForAtmosphereWithRedirection(CodeVerificationData *out, const char *name, const char *path, ncm::ProgramId program_id, bool is_hbl, bool is_specific) {
auto mount_impl = [=]() -> Result {
/* Clear the output. */
std::memset(out, 0, sizeof(*out));
/* Validate the mount name. */
R_TRY(impl::CheckMountName(name));
/* Validate the path isn't null. */
R_UNLESS(path != nullptr, fs::ResultInvalidPath());
/* Create an AtmosphereCodeFileSystem. */
auto ams_code_fs = std::make_unique<AtmosphereCodeFileSystem>();
R_UNLESS(ams_code_fs != nullptr, fs::ResultAllocationFailureInCodeA());
/* Initialize the code file system. */
R_TRY(ams_code_fs->Initialize(out, path, program_id, is_hbl, is_specific));
/* Register. */
R_RETURN(fsa::Register(name, std::move(ams_code_fs)));
};
/* Perform the mount. */
AMS_FS_R_TRY(AMS_FS_IMPL_ACCESS_LOG_SYSTEM_MOUNT(mount_impl(), name, AMS_FS_IMPL_ACCESS_LOG_FORMAT_MOUNT_CODE(name, path, program_id)));
/* Enable access logging. */
AMS_FS_IMPL_ACCESS_LOG_SYSTEM_FS_ACCESSOR_ENABLE(name);
R_SUCCEED();
}
Result MountCodeForAtmosphere(CodeVerificationData *out, const char *name, const char *path, ncm::ProgramId program_id) {
auto mount_impl = [=]() -> Result {
/* Clear the output. */
std::memset(out, 0, sizeof(*out));
/* Validate the mount name. */
R_TRY(impl::CheckMountName(name));
/* Validate the path isn't null. */
R_UNLESS(path != nullptr, fs::ResultInvalidPath());
/* Open the code file system. */
std::unique_ptr<fsa::IFileSystem> fsa;
R_TRY(OpenSdCardCodeOrStratosphereCodeOrCodeFileSystemImpl(out, std::addressof(fsa), path, program_id));
/* Create a wrapper fs. */
auto wrap_fsa = std::make_unique<SdCardRedirectionCodeFileSystem>(std::move(fsa), program_id, false);
R_UNLESS(wrap_fsa != nullptr, fs::ResultAllocationFailureInCodeA());
/* Register. */
R_RETURN(fsa::Register(name, std::move(wrap_fsa)));
};
/* Perform the mount. */
AMS_FS_R_TRY(AMS_FS_IMPL_ACCESS_LOG_SYSTEM_MOUNT(mount_impl(), name, AMS_FS_IMPL_ACCESS_LOG_FORMAT_MOUNT_CODE(name, path, program_id)));
/* Enable access logging. */
AMS_FS_IMPL_ACCESS_LOG_SYSTEM_FS_ACCESSOR_ENABLE(name);
R_SUCCEED();
}
}
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