diff options
Diffstat (limited to '')
| -rw-r--r-- | roots.cpp | 242 |
1 files changed, 71 insertions, 171 deletions
@@ -18,6 +18,7 @@ #include <ctype.h> #include <fcntl.h> +#include <inttypes.h> #include <stdint.h> #include <stdlib.h> #include <string.h> @@ -27,7 +28,7 @@ #include <sys/wait.h> #include <unistd.h> -#include <algorithm> +#include <iostream> #include <string> #include <vector> @@ -38,155 +39,60 @@ #include <cryptfs.h> #include <ext4_utils/wipe.h> #include <fs_mgr.h> +#include <fs_mgr/roots.h> +#include <fs_mgr_dm_linear.h> #include "otautil/mounts.h" +#include "otautil/sysutil.h" -static struct fstab* fstab = nullptr; +using android::fs_mgr::Fstab; +using android::fs_mgr::FstabEntry; +using android::fs_mgr::ReadDefaultFstab; + +static Fstab fstab; extern struct selabel_handle* sehandle; void load_volume_table() { - fstab = fs_mgr_read_fstab_default(); - if (!fstab) { + if (!ReadDefaultFstab(&fstab)) { LOG(ERROR) << "Failed to read default fstab"; return; } - int ret = fs_mgr_add_entry(fstab, "/tmp", "ramdisk", "ramdisk"); - if (ret == -1) { - LOG(ERROR) << "Failed to add /tmp entry to fstab"; - fs_mgr_free_fstab(fstab); - fstab = nullptr; - return; - } + fstab.emplace_back(FstabEntry{ + .mount_point = "/tmp", .fs_type = "ramdisk", .blk_device = "ramdisk", .length = 0 }); - printf("recovery filesystem table\n"); - printf("=========================\n"); - for (int i = 0; i < fstab->num_entries; ++i) { - const Volume* v = &fstab->recs[i]; - printf(" %d %s %s %s %lld\n", i, v->mount_point, v->fs_type, v->blk_device, v->length); + std::cout << "recovery filesystem table" << std::endl << "=========================" << std::endl; + for (size_t i = 0; i < fstab.size(); ++i) { + const auto& entry = fstab[i]; + std::cout << " " << i << " " << entry.mount_point << " " + << " " << entry.fs_type << " " << entry.blk_device << " " << entry.length + << std::endl; } - printf("\n"); + std::cout << std::endl; } Volume* volume_for_mount_point(const std::string& mount_point) { - return fs_mgr_get_entry_for_mount_point(fstab, mount_point); -} - -// Finds the volume specified by the given path. fs_mgr_get_entry_for_mount_point() does exact match -// only, so it attempts the prefixes recursively (e.g. "/cache/recovery/last_log", -// "/cache/recovery", "/cache", "/" for a given path of "/cache/recovery/last_log") and returns the -// first match or nullptr. -static Volume* volume_for_path(const char* path) { - if (path == nullptr || path[0] == '\0') return nullptr; - std::string str(path); - while (true) { - Volume* result = fs_mgr_get_entry_for_mount_point(fstab, str); - if (result != nullptr || str == "/") { - return result; - } - size_t slash = str.find_last_of('/'); - if (slash == std::string::npos) return nullptr; - if (slash == 0) { - str = "/"; - } else { - str = str.substr(0, slash); - } - } - return nullptr; + return android::fs_mgr::GetEntryForMountPoint(&fstab, mount_point); } // Mount the volume specified by path at the given mount_point. -int ensure_path_mounted_at(const char* path, const char* mount_point) { - Volume* v = volume_for_path(path); - if (v == nullptr) { - LOG(ERROR) << "unknown volume for path [" << path << "]"; - return -1; - } - if (strcmp(v->fs_type, "ramdisk") == 0) { - // The ramdisk is always mounted. - return 0; - } - - if (!scan_mounted_volumes()) { - LOG(ERROR) << "Failed to scan mounted volumes"; - return -1; - } - - if (!mount_point) { - mount_point = v->mount_point; - } - - const MountedVolume* mv = find_mounted_volume_by_mount_point(mount_point); - if (mv != nullptr) { - // Volume is already mounted. - return 0; - } - - mkdir(mount_point, 0755); // in case it doesn't already exist - - if (strcmp(v->fs_type, "ext4") == 0 || strcmp(v->fs_type, "squashfs") == 0 || - strcmp(v->fs_type, "vfat") == 0 || strcmp(v->fs_type, "f2fs") == 0) { - int result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options); - if (result == -1 && fs_mgr_is_formattable(v)) { - PLOG(ERROR) << "Failed to mount " << mount_point << "; formatting"; - bool crypt_footer = fs_mgr_is_encryptable(v) && !strcmp(v->key_loc, "footer"); - if (fs_mgr_do_format(v, crypt_footer) == 0) { - result = mount(v->blk_device, mount_point, v->fs_type, v->flags, v->fs_options); - } else { - PLOG(ERROR) << "Failed to format " << mount_point; - return -1; - } - } - - if (result == -1) { - PLOG(ERROR) << "Failed to mount " << mount_point; - return -1; - } - return 0; - } - - LOG(ERROR) << "unknown fs_type \"" << v->fs_type << "\" for " << mount_point; - return -1; +int ensure_path_mounted_at(const std::string& path, const std::string& mount_point) { + return android::fs_mgr::EnsurePathMounted(&fstab, path, mount_point) ? 0 : -1; } -int ensure_path_mounted(const char* path) { +int ensure_path_mounted(const std::string& path) { // Mount at the default mount point. - return ensure_path_mounted_at(path, nullptr); + return android::fs_mgr::EnsurePathMounted(&fstab, path) ? 0 : -1; } -int ensure_path_unmounted(const char* path) { - const Volume* v = volume_for_path(path); - if (v == nullptr) { - LOG(ERROR) << "unknown volume for path [" << path << "]"; - return -1; - } - if (strcmp(v->fs_type, "ramdisk") == 0) { - // The ramdisk is always mounted; you can't unmount it. - return -1; - } - - if (!scan_mounted_volumes()) { - LOG(ERROR) << "Failed to scan mounted volumes"; - return -1; - } - - MountedVolume* mv = find_mounted_volume_by_mount_point(v->mount_point); - if (mv == nullptr) { - // Volume is already unmounted. - return 0; - } - - return unmount_mounted_volume(mv); +int ensure_path_unmounted(const std::string& path) { + return android::fs_mgr::EnsurePathUnmounted(&fstab, path) ? 0 : -1; } static int exec_cmd(const std::vector<std::string>& args) { - CHECK_NE(static_cast<size_t>(0), args.size()); - - std::vector<char*> argv(args.size()); - std::transform(args.cbegin(), args.cend(), argv.begin(), - [](const std::string& arg) { return const_cast<char*>(arg.c_str()); }); - argv.push_back(nullptr); + CHECK(!args.empty()); + auto argv = StringVectorToNullTerminatedArray(args); pid_t child; if ((child = fork()) == 0) { @@ -225,17 +131,17 @@ static int64_t get_file_size(int fd, uint64_t reserve_len) { return computed_size; } -int format_volume(const char* volume, const char* directory) { - const Volume* v = volume_for_path(volume); +int format_volume(const std::string& volume, const std::string& directory) { + const FstabEntry* v = android::fs_mgr::GetEntryForPath(&fstab, volume); if (v == nullptr) { LOG(ERROR) << "unknown volume \"" << volume << "\""; return -1; } - if (strcmp(v->fs_type, "ramdisk") == 0) { + if (v->fs_type == "ramdisk") { LOG(ERROR) << "can't format_volume \"" << volume << "\""; return -1; } - if (strcmp(v->mount_point, volume) != 0) { + if (v->mount_point != volume) { LOG(ERROR) << "can't give path \"" << volume << "\" to format_volume"; return -1; } @@ -243,16 +149,16 @@ int format_volume(const char* volume, const char* directory) { LOG(ERROR) << "format_volume: Failed to unmount \"" << v->mount_point << "\""; return -1; } - if (strcmp(v->fs_type, "ext4") != 0 && strcmp(v->fs_type, "f2fs") != 0) { + if (v->fs_type != "ext4" && v->fs_type != "f2fs") { LOG(ERROR) << "format_volume: fs_type \"" << v->fs_type << "\" unsupported"; return -1; } // If there's a key_loc that looks like a path, it should be a block device for storing encryption // metadata. Wipe it too. - if (v->key_loc != nullptr && v->key_loc[0] == '/') { + if (!v->key_loc.empty() && v->key_loc[0] == '/') { LOG(INFO) << "Wiping " << v->key_loc; - int fd = open(v->key_loc, O_WRONLY | O_CREAT, 0644); + int fd = open(v->key_loc.c_str(), O_WRONLY | O_CREAT, 0644); if (fd == -1) { PLOG(ERROR) << "format_volume: Failed to open " << v->key_loc; return -1; @@ -264,9 +170,8 @@ int format_volume(const char* volume, const char* directory) { int64_t length = 0; if (v->length > 0) { length = v->length; - } else if (v->length < 0 || - (v->key_loc != nullptr && strcmp(v->key_loc, "footer") == 0)) { - android::base::unique_fd fd(open(v->blk_device, O_RDONLY)); + } else if (v->length < 0 || v->key_loc == "footer") { + android::base::unique_fd fd(open(v->blk_device.c_str(), O_RDONLY)); if (fd == -1) { PLOG(ERROR) << "format_volume: failed to open " << v->blk_device; return -1; @@ -280,7 +185,7 @@ int format_volume(const char* volume, const char* directory) { } } - if (strcmp(v->fs_type, "ext4") == 0) { + if (v->fs_type == "ext4") { static constexpr int kBlockSize = 4096; std::vector<std::string> mke2fs_args = { "/system/bin/mke2fs", "-F", "-t", "ext4", "-b", std::to_string(kBlockSize), @@ -303,7 +208,7 @@ int format_volume(const char* volume, const char* directory) { } int result = exec_cmd(mke2fs_args); - if (result == 0 && directory != nullptr) { + if (result == 0 && !directory.empty()) { std::vector<std::string> e2fsdroid_args = { "/system/bin/e2fsdroid", "-e", "-f", directory, "-a", volume, v->blk_device, }; @@ -319,71 +224,66 @@ int format_volume(const char* volume, const char* directory) { // Has to be f2fs because we checked earlier. static constexpr int kSectorSize = 4096; - std::string cmd("/sbin/mkfs.f2fs"); - // clang-format off std::vector<std::string> make_f2fs_cmd = { - cmd, - "-d1", - "-f", - "-O", "encrypt", - "-O", "quota", - "-O", "verity", - "-w", std::to_string(kSectorSize), + "/system/bin/make_f2fs", + "-g", + "android", v->blk_device, }; - // clang-format on if (length >= kSectorSize) { make_f2fs_cmd.push_back(std::to_string(length / kSectorSize)); } - int result = exec_cmd(make_f2fs_cmd); - if (result == 0 && directory != nullptr) { - cmd = "/sbin/sload.f2fs"; - // clang-format off + if (exec_cmd(make_f2fs_cmd) != 0) { + PLOG(ERROR) << "format_volume: Failed to make_f2fs on " << v->blk_device; + return -1; + } + if (!directory.empty()) { std::vector<std::string> sload_f2fs_cmd = { - cmd, - "-f", directory, - "-t", volume, - v->blk_device, + "/system/bin/sload_f2fs", "-f", directory, "-t", volume, v->blk_device, }; - // clang-format on - result = exec_cmd(sload_f2fs_cmd); - } - if (result != 0) { - PLOG(ERROR) << "format_volume: Failed " << cmd << " on " << v->blk_device; - return -1; + if (exec_cmd(sload_f2fs_cmd) != 0) { + PLOG(ERROR) << "format_volume: Failed to sload_f2fs on " << v->blk_device; + return -1; + } } return 0; } -int format_volume(const char* volume) { - return format_volume(volume, nullptr); +int format_volume(const std::string& volume) { + return format_volume(volume, ""); } int setup_install_mounts() { - if (fstab == nullptr) { + if (fstab.empty()) { LOG(ERROR) << "can't set up install mounts: no fstab loaded"; return -1; } - for (int i = 0; i < fstab->num_entries; ++i) { - const Volume* v = fstab->recs + i; - + for (const FstabEntry& entry : fstab) { // We don't want to do anything with "/". - if (strcmp(v->mount_point, "/") == 0) { + if (entry.mount_point == "/") { continue; } - if (strcmp(v->mount_point, "/tmp") == 0 || strcmp(v->mount_point, "/cache") == 0) { - if (ensure_path_mounted(v->mount_point) != 0) { - LOG(ERROR) << "Failed to mount " << v->mount_point; + if (entry.mount_point == "/tmp" || entry.mount_point == "/cache") { + if (ensure_path_mounted(entry.mount_point) != 0) { + LOG(ERROR) << "Failed to mount " << entry.mount_point; return -1; } } else { - if (ensure_path_unmounted(v->mount_point) != 0) { - LOG(ERROR) << "Failed to unmount " << v->mount_point; + if (ensure_path_unmounted(entry.mount_point) != 0) { + LOG(ERROR) << "Failed to unmount " << entry.mount_point; return -1; } } } return 0; } + +bool logical_partitions_mapped() { + return android::fs_mgr::LogicalPartitionsMapped(); +} + +std::string get_system_root() { + return android::fs_mgr::GetSystemRoot(); +} |