static int switch_to_legacy_properties()
{
if (!legacy_props_env_initd) {
if (legacy_properties_init() != 0)
return -1;
char tmp[32];
int propfd, propsz;
legacy_get_property_workspace(&propfd, &propsz);
sprintf(tmp, "%d,%d", dup(propfd), propsz);
setenv("ANDROID_PROPERTY_WORKSPACE", tmp, 1);
legacy_props_env_initd = true;
}
if (TWFunc::Path_Exists(properties_path)) {
// hide real properties so that the updater uses the envvar to find the legacy format properties
if (rename(properties_path, properties_path_renamed) != 0) {
LOGERR("Renaming %s failed: %s\n", properties_path, strerror(errno));
return -1;
} else {
legacy_props_path_modified = true;
}
}
return 0;
}
static int set_legacy_props() {
if (!legacy_props_env_initd) {
if (legacy_properties_init() != 0)
return -1;
char tmp[32];
int propfd, propsz;
legacy_get_property_workspace(&propfd, &propsz);
sprintf(tmp, "%d,%d", dup(propfd), propsz);
setenv("ANDROID_PROPERTY_WORKSPACE", tmp, 1);
legacy_props_env_initd = true;
}
if (rename(DEV_PROP_PATH, DEV_PROP_BACKUP_PATH) != 0) {
LOGE("Could not rename properties path: %s\n", DEV_PROP_PATH);
return -1;
} else {
legacy_props_path_modified = true;
}
return 0;
}
static bool initialize_adb()
{
bool ret = true;
const char *version = get_mbtool_version();
ret = write_file("/sys/class/android_usb/android0/enable", "0", 1) && ret;
ret = write_file("/sys/class/android_usb/android0/idVendor", "18D1", 4) && ret;
ret = write_file("/sys/class/android_usb/android0/idProduct", "4EE7", 4) && ret;
ret = write_file("/sys/class/android_usb/android0/f_ffs/aliases", "adb", 3) && ret;
ret = write_file("/sys/class/android_usb/android0/functions", "adb", 3) && ret;
ret = write_file("/sys/class/android_usb/android0/iManufacturer", "mbtool", 6) && ret;
ret = write_file("/sys/class/android_usb/android0/iProduct", "miniadbd", 8) && ret;
ret = write_file("/sys/class/android_usb/android0/iSerial", version, strlen(version)) && ret;
ret = write_file("/sys/class/android_usb/android0/enable", "1", 1) && ret;
// Create functionfs paths
if (!util::mkdir_recursive(USB_FFS_ADB_PATH, 0770)) {
LOGW("%s: Failed to create directory: %s",
USB_FFS_ADB_PATH, strerror(errno));
ret = false;
}
if (!util::mount("adb", USB_FFS_ADB_PATH, "functionfs", 0, "")) {
LOGW("%s: Failed to mount functionfs: %s",
USB_FFS_ADB_PATH, strerror(errno));
ret = false;
}
// Set environment variables
ret = setenv("PATH", "/system/bin", 1) == 0 && ret;
ret = setenv("LD_LIBRARY_PATH", "/system/lib", 1) == 0 && ret;
ret = setenv("ANDROID_DATA", "/data", 1) == 0 && ret;
ret = setenv("ANDROID_ROOT", "/system", 1) == 0 && ret;
// Use TWRP's legacy property workspace hack. TouchWiz's sh binary segfaults
// if there's no property service (i.e. no /dev/__properties__ and no valid
// ANDROID_PROPERTY_WORKSPACE environment variable). This doesn't actually
// start a "real" properties service (getprop and setprop will never work),
// but it's enough to prevent the segfaults.
char tmp[32];
int propfd, propsz;
legacy_properties_init();
// Load /default.prop
std::unordered_map<std::string, std::string> props;
util::file_get_all_properties("/default.prop", &props);
for (auto const &pair : props) {
legacy_property_set(pair.first.c_str(), pair.second.c_str());
}
// Load /system/build.prop
props.clear();
util::file_get_all_properties("/system/build.prop", &props);
for (auto const &pair : props) {
legacy_property_set(pair.first.c_str(), pair.second.c_str());
}
legacy_get_property_workspace(&propfd, &propsz);
snprintf(tmp, sizeof(tmp), "%d,%d", dup(propfd), propsz);
char *orig_prop_env = getenv("ANDROID_PROPERTY_WORKSPACE");
LOGD("Original properties environment: %s",
orig_prop_env ? orig_prop_env : "null");
setenv("ANDROID_PROPERTY_WORKSPACE", tmp, 1);
LOGD("Switched to legacy properties environment: %s", tmp);
return ret;
}
