blob: 3df7b5d44461efbb75561db43c8f677b213f4cf9 [file] [log] [blame]
#include "twrpApex.hpp"
namespace fs = std::filesystem;
bool twrpApex::loadApexImages() {
std::vector<std::string> apexFiles;
if (access(APEX_DIR, F_OK) != 0) {
LOGERR("Unable to open %s\n", APEX_DIR);
return false;
}
for (const auto& entry : fs::directory_iterator(APEX_DIR)) {
if (entry.is_regular_file()) {
apexFiles.push_back(entry.path().string());
}
}
if (apexFiles.size() == 0) {
// flattened apex directory
LOGINFO("Bind mounting flattened apex directory\n");
if (mount(APEX_DIR, APEX_BASE, "", MS_BIND, NULL) < 0) {
LOGERR("Unable to bind mount flattened apex directory\n");
return false;
}
return true;
}
if (!createLoopBackDevices(apexFiles.size())) {
LOGERR("Unable to create loop devices to mount apex files\n");
return false;
}
size_t apexFileCount = 0;
for (auto&& apexFile : apexFiles) {
std::string fileToMount = unzipImage(apexFile);
loadApexImage(fileToMount, apexFileCount++);
}
return true;
}
std::string twrpApex::unzipImage(std::string file) {
ZipArchiveHandle handle;
int32_t ret = OpenArchive(file.c_str(), &handle);
if (ret != 0) {
LOGERR("unable to open zip archive %s\n", file.c_str());
CloseArchive(handle);
return nullptr;
}
ZipEntry entry;
ZipString zip_string(APEX_PAYLOAD);
ret = FindEntry(handle, zip_string, &entry);
if (ret != 0) {
LOGERR("unable to find %s in zip\n", APEX_PAYLOAD);
CloseArchive(handle);
return nullptr;
}
std::string baseFile = basename(file.c_str());
std::string path("/tmp/");
path = path + baseFile;
int fd = open(path.c_str(), O_WRONLY|O_CREAT|O_TRUNC, 0666);
ret = ExtractEntryToFile(handle, &entry, fd);
if (ret != 0) {
LOGERR("unable to extract %s\n", path.c_str());
close(fd);
CloseArchive(handle);
return nullptr;
}
close(fd);
CloseArchive(handle);
return path;
}
bool twrpApex::createLoopBackDevices(size_t count) {
size_t existing_loop_device_count = 0;
for (const auto& entry : fs::directory_iterator(LOOP_BLOCK_DEVICE_DIR)) {
if (entry.is_block_file() && entry.path().string().find("loop") != std::string::npos) {
existing_loop_device_count++;
}
}
if (existing_loop_device_count < count) {
size_t devices_to_create = count - existing_loop_device_count;
for (size_t i = existing_loop_device_count; i < (devices_to_create + existing_loop_device_count); ++i) {
std::string loop_device = LOOP_BLOCK_DEVICE_DIR;
loop_device = loop_device + "loop" + std::to_string(i);
int ret = mknod(loop_device.c_str(), S_IFBLK | S_IRUSR | S_IWUSR , makedev(7, i));
if (ret != 0) {
LOGERR("unable to create loop device: %s\n", loop_device.c_str());
return false;
}
}
}
return true;
}
bool twrpApex::loadApexImage(std::string fileToMount, size_t loop_device_number) {
struct loop_info64 info;
int fd = open(fileToMount.c_str(), O_RDONLY);
if (fd < 0) {
LOGERR("unable to open apex file: %s\n", fileToMount.c_str());
return false;
}
std::string loop_device = "/dev/block/loop" + std::to_string(loop_device_number);
int loop_fd = open(loop_device.c_str(), O_RDONLY);
if (loop_fd < 0) {
LOGERR("unable to open loop device: %s\n", loop_device.c_str());
close(fd);
return false;
}
if (ioctl(loop_fd, LOOP_SET_FD, fd) < 0) {
LOGERR("failed to mount %s to loop device %s\n", fileToMount.c_str(), loop_device.c_str());
close(fd);
close(loop_fd);
return false;
}
close(fd);
memset(&info, 0, sizeof(struct loop_info64));
if (ioctl(loop_fd, LOOP_SET_STATUS64, &info)) {
LOGERR("failed to mount loop: %s: %s\n", fileToMount.c_str(), strerror(errno));
close(loop_fd);
return false;
}
close(loop_fd);
std::string bind_mount(APEX_BASE);
bind_mount = bind_mount + basename(fileToMount.c_str());
int ret = mkdir(bind_mount.c_str(), 0666);
if (ret != 0) {
LOGERR("Unable to create mount directory: %s\n", bind_mount.c_str());
return false;
}
ret = mount(loop_device.c_str(), bind_mount.c_str(), "ext4", MS_RDONLY, nullptr);
if (ret != 0) {
LOGERR("unable to mount loop device %s to %s\n", loop_device.c_str(), bind_mount.c_str());
return false;
}
return true;
}