diff options
Diffstat (limited to 'fuse_sdcard_install.cpp')
-rw-r--r-- | fuse_sdcard_install.cpp | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/fuse_sdcard_install.cpp b/fuse_sdcard_install.cpp deleted file mode 100644 index 1f385093f..000000000 --- a/fuse_sdcard_install.cpp +++ /dev/null @@ -1,206 +0,0 @@ -/* - * Copyright (C) 2019 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. - */ - -#include "fuse_sdcard_install.h" - -#include <dirent.h> -#include <signal.h> -#include <sys/mount.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <sys/wait.h> -#include <unistd.h> - -#include <algorithm> -#include <functional> -#include <memory> -#include <vector> - -#include <android-base/logging.h> -#include <android-base/strings.h> - -#include "bootloader_message/bootloader_message.h" -#include "fuse_provider.h" -#include "fuse_sideload.h" -#include "install.h" -#include "roots.h" - -static constexpr const char* SDCARD_ROOT = "/sdcard"; -// How long (in seconds) we wait for the fuse-provided package file to -// appear, before timing out. -static constexpr int SDCARD_INSTALL_TIMEOUT = 10; - -// Set the BCB to reboot back into recovery (it won't resume the install from -// sdcard though). -static void SetSdcardUpdateBootloaderMessage() { - std::vector<std::string> options; - std::string err; - if (!update_bootloader_message(options, &err)) { - LOG(ERROR) << "Failed to set BCB message: " << err; - } -} - -// Returns the selected filename, or an empty string. -static std::string BrowseDirectory(const std::string& path, Device* device, RecoveryUI* ui) { - ensure_path_mounted(path); - - std::unique_ptr<DIR, decltype(&closedir)> d(opendir(path.c_str()), closedir); - if (!d) { - PLOG(ERROR) << "error opening " << path; - return ""; - } - - std::vector<std::string> dirs; - std::vector<std::string> entries{ "../" }; // "../" is always the first entry. - - dirent* de; - while ((de = readdir(d.get())) != nullptr) { - std::string name(de->d_name); - - if (de->d_type == DT_DIR) { - // Skip "." and ".." entries. - if (name == "." || name == "..") continue; - dirs.push_back(name + "/"); - } else if (de->d_type == DT_REG && android::base::EndsWithIgnoreCase(name, ".zip")) { - entries.push_back(name); - } - } - - std::sort(dirs.begin(), dirs.end()); - std::sort(entries.begin(), entries.end()); - - // Append dirs to the entries list. - entries.insert(entries.end(), dirs.begin(), dirs.end()); - - std::vector<std::string> headers{ "Choose a package to install:", path }; - - size_t chosen_item = 0; - while (true) { - chosen_item = ui->ShowMenu( - headers, entries, chosen_item, true, - std::bind(&Device::HandleMenuKey, device, std::placeholders::_1, std::placeholders::_2)); - - // Return if WaitKey() was interrupted. - if (chosen_item == static_cast<size_t>(RecoveryUI::KeyError::INTERRUPTED)) { - return ""; - } - - const std::string& item = entries[chosen_item]; - if (chosen_item == 0) { - // Go up but continue browsing (if the caller is BrowseDirectory). - return ""; - } - - std::string new_path = path + "/" + item; - if (new_path.back() == '/') { - // Recurse down into a subdirectory. - new_path.pop_back(); - std::string result = BrowseDirectory(new_path, device, ui); - if (!result.empty()) return result; - } else { - // Selected a zip file: return the path to the caller. - return new_path; - } - } - - // Unreachable. -} - -static bool StartSdcardFuse(const std::string& path) { - auto file_data_reader = std::make_unique<FuseFileDataProvider>(path, 65536); - - if (!file_data_reader->Valid()) { - return false; - } - - // The installation process expects to find the sdcard unmounted. Unmount it with MNT_DETACH so - // that our open file continues to work but new references see it as unmounted. - umount2("/sdcard", MNT_DETACH); - - return run_fuse_sideload(std::move(file_data_reader)) == 0; -} - -int ApplyFromSdcard(Device* device, bool* wipe_cache, RecoveryUI* ui) { - if (ensure_path_mounted(SDCARD_ROOT) != 0) { - LOG(ERROR) << "\n-- Couldn't mount " << SDCARD_ROOT << ".\n"; - return INSTALL_ERROR; - } - - std::string path = BrowseDirectory(SDCARD_ROOT, device, ui); - if (path.empty()) { - LOG(ERROR) << "\n-- No package file selected.\n"; - ensure_path_unmounted(SDCARD_ROOT); - return INSTALL_ERROR; - } - - ui->Print("\n-- Install %s ...\n", path.c_str()); - SetSdcardUpdateBootloaderMessage(); - - // We used to use fuse in a thread as opposed to a process. Since accessing - // through fuse involves going from kernel to userspace to kernel, it leads - // to deadlock when a page fault occurs. (Bug: 26313124) - pid_t child; - if ((child = fork()) == 0) { - bool status = StartSdcardFuse(path); - - _exit(status ? EXIT_SUCCESS : EXIT_FAILURE); - } - - // FUSE_SIDELOAD_HOST_PATHNAME will start to exist once the fuse in child - // process is ready. - int result = INSTALL_ERROR; - int status; - bool waited = false; - for (int i = 0; i < SDCARD_INSTALL_TIMEOUT; ++i) { - if (waitpid(child, &status, WNOHANG) == -1) { - result = INSTALL_ERROR; - waited = true; - break; - } - - struct stat sb; - if (stat(FUSE_SIDELOAD_HOST_PATHNAME, &sb) == -1) { - if (errno == ENOENT && i < SDCARD_INSTALL_TIMEOUT - 1) { - sleep(1); - continue; - } else { - LOG(ERROR) << "Timed out waiting for the fuse-provided package."; - result = INSTALL_ERROR; - kill(child, SIGKILL); - break; - } - } - - result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, false, 0 /*retry_count*/); - break; - } - - if (!waited) { - // Calling stat() on this magic filename signals the fuse - // filesystem to shut down. - struct stat sb; - stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &sb); - - waitpid(child, &status, 0); - } - - if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { - LOG(ERROR) << "Error exit from the fuse process: " << WEXITSTATUS(status); - } - - ensure_path_unmounted(SDCARD_ROOT); - return result; -} |