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#include "fs.h"
#include "fastboot.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifndef WIN32
#include <sys/wait.h>
#else
#include <tchar.h>
#include <windows.h>
#endif
#include <unistd.h>
#include <vector>
#include <android-base/errors.h>
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
using android::base::StringPrintf;
using android::base::unique_fd;
#ifdef WIN32
static int exec_e2fs_cmd(const char* path, char* const argv[]) {
std::string cmd;
int i = 0;
while (argv[i] != nullptr) {
cmd += argv[i++];
cmd += " ";
}
cmd = cmd.substr(0, cmd.size() - 1);
STARTUPINFO si;
PROCESS_INFORMATION pi;
DWORD exit_code = 0;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));
SetEnvironmentVariableA("MKE2FS_CONFIG", "");
if (!CreateProcessA(nullptr, // No module name (use command line)
const_cast<char*>(cmd.c_str()), // Command line
nullptr, // Process handle not inheritable
nullptr, // Thread handle not inheritable
FALSE, // Set handle inheritance to FALSE
0, // No creation flags
nullptr, // Use parent's environment block
nullptr, // Use parent's starting directory
&si, // Pointer to STARTUPINFO structure
&pi) // Pointer to PROCESS_INFORMATION structure
) {
fprintf(stderr, "CreateProcess failed: %s\n",
android::base::SystemErrorCodeToString(GetLastError()).c_str());
return -1;
}
WaitForSingleObject(pi.hProcess, INFINITE);
GetExitCodeProcess(pi.hProcess, &exit_code);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
return exit_code != 0;
}
#else
static int exec_e2fs_cmd(const char* path, char* const argv[]) {
int status;
pid_t child;
if ((child = fork()) == 0) {
setenv("MKE2FS_CONFIG", "", 1);
execvp(path, argv);
_exit(EXIT_FAILURE);
}
if (child < 0) {
fprintf(stderr, "%s failed with fork %s\n", path, strerror(errno));
return -1;
}
if (TEMP_FAILURE_RETRY(waitpid(child, &status, 0)) == -1) {
fprintf(stderr, "%s failed with waitpid %s\n", path, strerror(errno));
return -1;
}
int ret = -1;
if (WIFEXITED(status)) {
ret = WEXITSTATUS(status);
if (ret != 0) {
fprintf(stderr, "%s failed with status %d\n", path, ret);
}
}
return ret;
}
#endif
static int generate_ext4_image(const char* fileName, long long partSize,
const std::string& initial_dir, unsigned eraseBlkSize,
unsigned logicalBlkSize) {
static constexpr int block_size = 4096;
const std::string exec_dir = android::base::GetExecutableDirectory();
const std::string mke2fs_path = exec_dir + "/mke2fs";
std::vector<const char*> mke2fs_args = {mke2fs_path.c_str(), "-t", "ext4", "-b"};
std::string block_size_str = std::to_string(block_size);
mke2fs_args.push_back(block_size_str.c_str());
std::string ext_attr = "android_sparse";
if (eraseBlkSize != 0 && logicalBlkSize != 0) {
int raid_stride = logicalBlkSize / block_size;
int raid_stripe_width = eraseBlkSize / block_size;
// stride should be the max of 8kb and logical block size
if (logicalBlkSize != 0 && logicalBlkSize < 8192) raid_stride = 8192 / block_size;
// stripe width should be >= stride
if (raid_stripe_width < raid_stride) raid_stripe_width = raid_stride;
ext_attr += StringPrintf(",stride=%d,stripe-width=%d", raid_stride, raid_stripe_width);
}
mke2fs_args.push_back("-E");
mke2fs_args.push_back(ext_attr.c_str());
mke2fs_args.push_back("-O");
mke2fs_args.push_back("uninit_bg");
mke2fs_args.push_back(fileName);
std::string size_str = std::to_string(partSize / block_size);
mke2fs_args.push_back(size_str.c_str());
mke2fs_args.push_back(nullptr);
int ret = exec_e2fs_cmd(mke2fs_args[0], const_cast<char**>(mke2fs_args.data()));
if (ret != 0) {
fprintf(stderr, "mke2fs failed: %d\n", ret);
return -1;
}
if (initial_dir.empty()) {
return 0;
}
const std::string e2fsdroid_path = exec_dir + "/e2fsdroid";
std::vector<const char*> e2fsdroid_args = {e2fsdroid_path.c_str(), "-f", initial_dir.c_str(),
fileName, nullptr};
ret = exec_e2fs_cmd(e2fsdroid_args[0], const_cast<char**>(e2fsdroid_args.data()));
if (ret != 0) {
fprintf(stderr, "e2fsdroid failed: %d\n", ret);
return -1;
}
return 0;
}
static int generate_f2fs_image(const char* fileName, long long partSize, const std::string& initial_dir,
unsigned /* unused */, unsigned /* unused */)
{
#ifndef WIN32
const std::string exec_dir = android::base::GetExecutableDirectory();
const std::string mkf2fs_path = exec_dir + "/make_f2fs";
std::vector<const char*> mkf2fs_args = {mkf2fs_path.c_str()};
mkf2fs_args.push_back("-S");
std::string size_str = std::to_string(partSize);
mkf2fs_args.push_back(size_str.c_str());
mkf2fs_args.push_back("-f");
mkf2fs_args.push_back("-O");
mkf2fs_args.push_back("encrypt");
mkf2fs_args.push_back("-O");
mkf2fs_args.push_back("quota");
mkf2fs_args.push_back(fileName);
mkf2fs_args.push_back(nullptr);
int ret = exec_e2fs_cmd(mkf2fs_args[0], const_cast<char**>(mkf2fs_args.data()));
if (ret != 0) {
fprintf(stderr, "mkf2fs failed: %d\n", ret);
return -1;
}
if (!initial_dir.empty()) {
fprintf(stderr, "sload.f2s not supported yet\n");
return 0;
}
return 0;
#else
fprintf(stderr, "make_f2fs not supported on Windows\n");
return -1;
#endif
}
static const struct fs_generator {
const char* fs_type; //must match what fastboot reports for partition type
//returns 0 or error value
int (*generate)(const char* fileName, long long partSize, const std::string& initial_dir,
unsigned eraseBlkSize, unsigned logicalBlkSize);
} generators[] = {
{ "ext4", generate_ext4_image},
{ "f2fs", generate_f2fs_image},
};
const struct fs_generator* fs_get_generator(const std::string& fs_type) {
for (size_t i = 0; i < sizeof(generators) / sizeof(*generators); i++) {
if (fs_type == generators[i].fs_type) {
return generators + i;
}
}
return nullptr;
}
int fs_generator_generate(const struct fs_generator* gen, const char* fileName, long long partSize,
const std::string& initial_dir, unsigned eraseBlkSize, unsigned logicalBlkSize)
{
return gen->generate(fileName, partSize, initial_dir, eraseBlkSize, logicalBlkSize);
}
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