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Snap for 5198681 from 81d8e2e4dd to qt-release

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Change-Id: I6f0b5db58eae904d4be1426f97f9611f3cc123cf
This commit is contained in:
android-build-team Robot
2018-12-23 04:05:33 +00:00
parent 11085265d1 81d8e2e4dd
commit 62227b5445
9 changed files with 102 additions and 249 deletions
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fsck_unshare_blocks.cpp
+1 -1
View File
@@ -121,7 +121,7 @@ bool do_fsck_unshare_blocks() {
// Temporarily mount system so we can copy e2fsck_static.
std::string system_root = get_system_root();
bool mounted = ensure_path_mounted_at(system_root.c_str(), "/mnt/system") != -1;
bool mounted = ensure_path_mounted_at(system_root, "/mnt/system") != -1;
partitions.push_back(system_root);
if (!mounted) {
install.cpp
+5 -9
View File
@@ -395,12 +395,8 @@ static int try_update_binary(const std::string& package, ZipArchiveHandle zip, b
// update attempt.
//
// Convert the vector to a NULL-terminated char* array suitable for execv.
const char* chr_args[args.size() + 1];
chr_args[args.size()] = nullptr;
for (size_t i = 0; i < args.size(); i++) {
chr_args[i] = args[i].c_str();
}
// Convert the std::string vector to a NULL-terminated char* vector suitable for execv.
auto chr_args = StringVectorToNullTerminatedArray(args);
pid_t pid = fork();
@@ -415,7 +411,7 @@ static int try_update_binary(const std::string& package, ZipArchiveHandle zip, b
if (pid == 0) {
umask(022);
close(pipefd[0]);
execv(chr_args[0], const_cast<char**>(chr_args));
execv(chr_args[0], chr_args.data());
// Bug: 34769056
// We shouldn't use LOG/PLOG in the forked process, since they may cause
// the child process to hang. This deadlock results from an improperly
@@ -595,9 +591,9 @@ static int really_install_package(const std::string& path, bool* wipe_cache, boo
if (needs_mount) {
if (path[0] == '@') {
ensure_path_mounted(path.substr(1).c_str());
ensure_path_mounted(path.substr(1));
} else {
ensure_path_mounted(path.c_str());
ensure_path_mounted(path);
}
}
logging.cpp
+1 -1
View File
@@ -46,7 +46,7 @@ static const std::string LAST_LOG_FILTER = "recovery/last_log";
// fopen(3)'s the given file, by mounting volumes and making parent dirs as necessary. Returns the
// file pointer, or nullptr on error.
static FILE* fopen_path(const std::string& path, const char* mode) {
if (ensure_path_mounted(path.c_str()) != 0) {
if (ensure_path_mounted(path) != 0) {
LOG(ERROR) << "Can't mount " << path;
return nullptr;
}
recovery.cpp
+3 -3
View File
@@ -294,7 +294,7 @@ bool SetUsbConfig(const std::string& state) {
// Returns the selected filename, or an empty string.
static std::string browse_directory(const std::string& path, Device* device) {
ensure_path_mounted(path.c_str());
ensure_path_mounted(path);
std::unique_ptr<DIR, decltype(&closedir)> d(opendir(path.c_str()), closedir);
if (!d) {
@@ -578,7 +578,7 @@ static void choose_recovery_file(Device* device) {
log_file += "." + std::to_string(i);
}
if (ensure_path_mounted(log_file.c_str()) == 0 && access(log_file.c_str(), R_OK) == 0) {
if (ensure_path_mounted(log_file) == 0 && access(log_file.c_str(), R_OK) == 0) {
entries.push_back(std::move(log_file));
}
};
@@ -842,7 +842,7 @@ static Device::BuiltinAction prompt_and_wait(Device* device, int status) {
}
case Device::MOUNT_SYSTEM:
// the system partition is mounted at /mnt/system
if (ensure_path_mounted_at(get_system_root().c_str(), "/mnt/system") != -1) {
if (ensure_path_mounted_at(get_system_root(), "/mnt/system") != -1) {
ui->Print("Mounted /system.\n");
}
break;
roots.cpp
+50 -175
View File
@@ -28,7 +28,7 @@
#include <sys/wait.h>
#include <unistd.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
@@ -39,177 +39,59 @@
#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;
static bool did_map_logical_partitions = false;
static constexpr const char* SYSTEM_ROOT = "/system";
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 %" PRId64 "\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;
auto it = std::find_if(fstab.begin(), fstab.end(), [&mount_point](const auto& entry) {
return entry.mount_point == mount_point;
});
return it == fstab.end() ? nullptr : &*it;
}
// 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;
}
// If we can't acquire the block device for a logical partition, it likely
// was never created. In that case we try to create it.
if (fs_mgr_is_logical(v) && !fs_mgr_update_logical_partition(v)) {
if (did_map_logical_partitions) {
LOG(ERROR) << "Failed to find block device for partition";
return -1;
}
std::string super_name = fs_mgr_get_super_partition_name();
if (!android::fs_mgr::CreateLogicalPartitions(super_name)) {
LOG(ERROR) << "Failed to create logical partitions";
return -1;
}
did_map_logical_partitions = true;
if (!fs_mgr_update_logical_partition(v)) {
LOG(ERROR) << "Failed to find block device for partition";
return -1;
}
}
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) {
@@ -248,17 +130,17 @@ 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;
}
@@ -266,16 +148,16 @@ 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;
@@ -287,9 +169,8 @@ 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;
@@ -303,7 +184,7 @@ 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),
@@ -326,7 +207,7 @@ 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,
};
@@ -355,7 +236,7 @@ int format_volume(const char* volume, const char* directory) {
}
int result = exec_cmd(make_f2fs_cmd);
if (result == 0 && directory != nullptr) {
if (result == 0 && !directory.empty()) {
cmd = "/sbin/sload.f2fs";
// clang-format off
std::vector<std::string> sload_f2fs_cmd = {
@@ -374,31 +255,29 @@ int format_volume(const char* volume, const char* directory) {
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;
}
}
@@ -407,13 +286,9 @@ int setup_install_mounts() {
}
bool logical_partitions_mapped() {
return did_map_logical_partitions;
return android::fs_mgr::LogicalPartitionsMapped();
}
std::string get_system_root() {
if (volume_for_mount_point(SYSTEM_ROOT) == nullptr) {
return "/";
} else {
return SYSTEM_ROOT;
}
return android::fs_mgr::GetSystemRoot();
}
roots.h
+6 -6
View File
@@ -19,7 +19,7 @@
#include <string>
typedef struct fstab_rec Volume;
typedef struct FstabEntry Volume;
// Load and parse volume data from /etc/recovery.fstab.
void load_volume_table();
@@ -29,25 +29,25 @@ Volume* volume_for_mount_point(const std::string& mount_point);
// Make sure that the volume 'path' is on is mounted. Returns 0 on
// success (volume is mounted).
int ensure_path_mounted(const char* path);
int ensure_path_mounted(const std::string& path);
// Similar to ensure_path_mounted, but allows one to specify the mount_point.
int ensure_path_mounted_at(const char* path, const char* mount_point);
int ensure_path_mounted_at(const std::string& path, const std::string& mount_point);
// Make sure that the volume 'path' is on is unmounted. Returns 0 on
// success (volume is unmounted);
int ensure_path_unmounted(const char* path);
int ensure_path_unmounted(const std::string& path);
// Reformat the given volume (must be the mount point only, eg
// "/cache"), no paths permitted. Attempts to unmount the volume if
// it is mounted.
int format_volume(const char* volume);
int format_volume(const std::string& volume);
// Reformat the given volume (must be the mount point only, eg
// "/cache"), no paths permitted. Attempts to unmount the volume if
// it is mounted.
// Copies 'directory' to root of the newly formatted volume
int format_volume(const char* volume, const char* directory);
int format_volume(const std::string& volume, const std::string& directory);
// Ensure that all and only the volumes that packages expect to find
// mounted (/tmp and /cache) are mounted. Returns 0 on success.
screen_ui.cpp
+1
View File
@@ -252,6 +252,7 @@ int GraphicMenu::DrawItems(int x, int y, int screen_width, bool long_press) cons
draw_funcs_.SetColor(UIElement::MENU);
}
offset += draw_funcs_.DrawHorizontalRule(y + offset);
return offset;
}
tests/Android.bp
+1
View File
@@ -94,6 +94,7 @@ librecovery_static_libs = [
"libhidltransport",
"libhwbinder_noltopgo",
"libbinderthreadstate",
"liblp",
"libvndksupport",
"libtinyxml2",
]
updater/install.cpp
+34 -54
View File
@@ -393,17 +393,20 @@ Value* UnmountFn(const char* name, State* state, const std::vector<std::unique_p
return StringValue(mount_point);
}
static int exec_cmd(const char* path, char* const argv[]) {
static int exec_cmd(const std::vector<std::string>& args) {
CHECK(!args.empty());
auto argv = StringVectorToNullTerminatedArray(args);
pid_t child;
if ((child = vfork()) == 0) {
execv(path, argv);
execv(argv[0], argv.data());
_exit(EXIT_FAILURE);
}
int status;
waitpid(child, &status, 0);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
LOG(ERROR) << path << " failed with status " << WEXITSTATUS(status);
LOG(ERROR) << args[0] << " failed with status " << WEXITSTATUS(status);
}
return WEXITSTATUS(status);
}
@@ -453,62 +456,52 @@ Value* FormatFn(const char* name, State* state, const std::vector<std::unique_pt
}
if (fs_type == "ext4") {
const char* mke2fs_argv[] = { "/system/bin/mke2fs", "-t", "ext4", "-b", "4096",
location.c_str(), nullptr, nullptr };
std::string size_str;
std::vector<std::string> mke2fs_args = {
"/system/bin/mke2fs", "-t", "ext4", "-b", "4096", location
};
if (size != 0) {
size_str = std::to_string(size / 4096LL);
mke2fs_argv[6] = size_str.c_str();
mke2fs_args.push_back(std::to_string(size / 4096LL));
}
int status = exec_cmd(mke2fs_argv[0], const_cast<char**>(mke2fs_argv));
if (status != 0) {
if (auto status = exec_cmd(mke2fs_args); status != 0) {
LOG(ERROR) << name << ": mke2fs failed (" << status << ") on " << location;
return StringValue("");
}
const char* e2fsdroid_argv[] = { "/system/bin/e2fsdroid", "-e", "-a", mount_point.c_str(),
location.c_str(), nullptr };
status = exec_cmd(e2fsdroid_argv[0], const_cast<char**>(e2fsdroid_argv));
if (status != 0) {
if (auto status = exec_cmd({ "/system/bin/e2fsdroid", "-e", "-a", mount_point, location });
status != 0) {
LOG(ERROR) << name << ": e2fsdroid failed (" << status << ") on " << location;
return StringValue("");
}
return StringValue(location);
} else if (fs_type == "f2fs") {
}
if (fs_type == "f2fs") {
if (size < 0) {
LOG(ERROR) << name << ": fs_size can't be negative for f2fs: " << fs_size;
return StringValue("");
}
std::string num_sectors = std::to_string(size / 512);
const char* f2fs_path = "/sbin/mkfs.f2fs";
const char* f2fs_argv[] = { "mkfs.f2fs",
"-g", "android",
"-w", "512",
location.c_str(),
(size < 512) ? nullptr : num_sectors.c_str(),
nullptr };
int status = exec_cmd(f2fs_path, const_cast<char**>(f2fs_argv));
if (status != 0) {
std::vector<std::string> f2fs_args = {
"/sbin/mkfs.f2fs", "-g", "android", "-w", "512", location
};
if (size >= 512) {
f2fs_args.push_back(std::to_string(size / 512));
}
if (auto status = exec_cmd(f2fs_args); status != 0) {
LOG(ERROR) << name << ": mkfs.f2fs failed (" << status << ") on " << location;
return StringValue("");
}
const char* sload_argv[] = { "/sbin/sload.f2fs", "-t", mount_point.c_str(), location.c_str(),
nullptr };
status = exec_cmd(sload_argv[0], const_cast<char**>(sload_argv));
if (status != 0) {
if (auto status = exec_cmd({ "/sbin/sload.f2fs", "-t", mount_point, location }); status != 0) {
LOG(ERROR) << name << ": sload.f2fs failed (" << status << ") on " << location;
return StringValue("");
}
return StringValue(location);
} else {
LOG(ERROR) << name << ": unsupported fs_type \"" << fs_type << "\" partition_type \""
<< partition_type << "\"";
}
LOG(ERROR) << name << ": unsupported fs_type \"" << fs_type << "\" partition_type \""
<< partition_type << "\"";
return nullptr;
}
@@ -675,17 +668,12 @@ Value* RunProgramFn(const char* name, State* state, const std::vector<std::uniqu
return ErrorAbort(state, kArgsParsingFailure, "%s() Failed to parse the argument(s)", name);
}
char* args2[argv.size() + 1];
for (size_t i = 0; i < argv.size(); i++) {
args2[i] = &args[i][0];
}
args2[argv.size()] = nullptr;
LOG(INFO) << "about to run program [" << args2[0] << "] with " << argv.size() << " args";
auto exec_args = StringVectorToNullTerminatedArray(args);
LOG(INFO) << "about to run program [" << exec_args[0] << "] with " << argv.size() << " args";
pid_t child = fork();
if (child == 0) {
execv(args2[0], args2);
execv(exec_args[0], exec_args.data());
PLOG(ERROR) << "run_program: execv failed";
_exit(EXIT_FAILURE);
}
@@ -909,20 +897,12 @@ Value* Tune2FsFn(const char* name, State* state, const std::vector<std::unique_p
return ErrorAbort(state, kArgsParsingFailure, "%s() could not read args", name);
}
char* args2[argv.size() + 1];
// Tune2fs expects the program name as its args[0]
args2[0] = const_cast<char*>(name);
if (args2[0] == nullptr) {
return nullptr;
}
for (size_t i = 0; i < argv.size(); ++i) {
args2[i + 1] = &args[i][0];
}
// tune2fs expects the program name as its first arg.
args.insert(args.begin(), "tune2fs");
auto tune2fs_args = StringVectorToNullTerminatedArray(args);
// tune2fs changes the file system parameters on an ext2 file system; it
// returns 0 on success.
int result = tune2fs_main(argv.size() + 1, args2);
if (result != 0) {
// tune2fs changes the filesystem parameters on an ext2 filesystem; it returns 0 on success.
if (auto result = tune2fs_main(tune2fs_args.size() - 1, tune2fs_args.data()); result != 0) {
return ErrorAbort(state, kTune2FsFailure, "%s() returned error code %d", name, result);
}
return StringValue("t");