int initialize_directories() {
// /data/user
char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
// /data/data
char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
// /data/user/0
char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX,
"0");
int ret = -1;
if (user_data_dir != NULL && primary_data_dir != NULL && legacy_data_dir != NULL) {
ret = 0;
// Make the /data/user directory if necessary
if (access(user_data_dir, R_OK) < 0) {
if (mkdir(user_data_dir, 0755) < 0) {
return -1;
}
if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
return -1;
}
}
// Make the /data/user/0 symlink to /data/data if necessary
if (access(primary_data_dir, R_OK) < 0) {
ret = symlink(legacy_data_dir, primary_data_dir);
}
free(user_data_dir);
free(legacy_data_dir);
free(primary_data_dir);
}
return ret;
}
int initialize_directories() {
int res = -1;
// Read current filesystem layout version to handle upgrade paths
char version_path[PATH_MAX];
snprintf(version_path, PATH_MAX, "%s.layout_version", android_data_dir.path);
int oldVersion;
if (fs_read_atomic_int(version_path, &oldVersion) == -1) {
oldVersion = 0;
}
int version = oldVersion;
// /data/user
char *user_data_dir = build_string2(android_data_dir.path, SECONDARY_USER_PREFIX);
// /data/data
char *legacy_data_dir = build_string2(android_data_dir.path, PRIMARY_USER_PREFIX);
// /data/user/0
char *primary_data_dir = build_string3(android_data_dir.path, SECONDARY_USER_PREFIX, "0");
if (!user_data_dir || !legacy_data_dir || !primary_data_dir) {
goto fail;
}
// Make the /data/user directory if necessary
if (access(user_data_dir, R_OK) < 0) {
if (mkdir(user_data_dir, 0711) < 0) {
goto fail;
}
if (chown(user_data_dir, AID_SYSTEM, AID_SYSTEM) < 0) {
goto fail;
}
if (chmod(user_data_dir, 0711) < 0) {
goto fail;
}
}
// Make the /data/user/0 symlink to /data/data if necessary
if (access(primary_data_dir, R_OK) < 0) {
if (symlink(legacy_data_dir, primary_data_dir)) {
goto fail;
}
}
if (version == 0) {
// Introducing multi-user, so migrate /data/media contents into /data/media/0
ALOGD("Upgrading /data/media for multi-user");
// Ensure /data/media
if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
// /data/media.tmp
char media_tmp_dir[PATH_MAX];
snprintf(media_tmp_dir, PATH_MAX, "%smedia.tmp", android_data_dir.path);
// Only copy when upgrade not already in progress
if (access(media_tmp_dir, F_OK) == -1) {
if (rename(android_media_dir.path, media_tmp_dir) == -1) {
ALOGE("Failed to move legacy media path: %s", strerror(errno));
goto fail;
}
}
// Create /data/media again
if (fs_prepare_dir(android_media_dir.path, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
// /data/media/0
char owner_media_dir[PATH_MAX];
snprintf(owner_media_dir, PATH_MAX, "%s0", android_media_dir.path);
// Move any owner data into place
if (access(media_tmp_dir, F_OK) == 0) {
if (rename(media_tmp_dir, owner_media_dir) == -1) {
ALOGE("Failed to move owner media path: %s", strerror(errno));
goto fail;
}
}
// Ensure media directories for any existing users
DIR *dir;
struct dirent *dirent;
char user_media_dir[PATH_MAX];
dir = opendir(user_data_dir);
if (dir != NULL) {
while ((dirent = readdir(dir))) {
if (dirent->d_type == DT_DIR) {
const char *name = dirent->d_name;
// skip "." and ".."
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
// /data/media/<user_id>
snprintf(user_media_dir, PATH_MAX, "%s%s", android_media_dir.path, name);
if (fs_prepare_dir(user_media_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
}
}
closedir(dir);
}
version = 1;
}
// /data/media/obb
char media_obb_dir[PATH_MAX];
snprintf(media_obb_dir, PATH_MAX, "%sobb", android_media_dir.path);
if (version == 1) {
// Introducing /data/media/obb for sharing OBB across users; migrate
// any existing OBB files from owner.
ALOGD("Upgrading to shared /data/media/obb");
// /data/media/0/Android/obb
char owner_obb_path[PATH_MAX];
snprintf(owner_obb_path, PATH_MAX, "%s0/Android/obb", android_media_dir.path);
// Only move if target doesn't already exist
if (access(media_obb_dir, F_OK) != 0 && access(owner_obb_path, F_OK) == 0) {
if (rename(owner_obb_path, media_obb_dir) == -1) {
ALOGE("Failed to move OBB from owner: %s", strerror(errno));
goto fail;
}
}
version = 2;
}
if (ensure_media_user_dirs(0) == -1) {
ALOGE("Failed to setup media for user 0");
goto fail;
}
if (fs_prepare_dir(media_obb_dir, 0770, AID_MEDIA_RW, AID_MEDIA_RW) == -1) {
goto fail;
}
// Persist layout version if changed
if (version != oldVersion) {
if (fs_write_atomic_int(version_path, version) == -1) {
ALOGE("Failed to save version to %s: %s", version_path, strerror(errno));
goto fail;
}
}
// Success!
res = 0;
fail:
free(user_data_dir);
free(legacy_data_dir);
free(primary_data_dir);
return res;
}