Android recovery 下恢复备份文件

 在Android 系统Udate时，需要删除系统原先的全部数据。这里提供一个方法，在系统Update后，恢复个人自己的私有文件或数据。

1 修改 /bootable/recovery/recovery.c 

2 提供一个特定目录保存自己的文件/recovery-bak/data-bak.zip，也可以自定义备份文件夹；要与上面的代码相对应。

 

 

/bootable/recovery/recovery.c main函数：
.....

    } else if (wipe_data) {
        printf("wipe_data..., default INSTALL_SUCCESS value = %d\n", status);
        if (device_wipe_data()) status = INSTALL_ERROR;
        if (erase_volume("/data")) status = INSTALL_ERROR;
        if (wipe_cache && erase_volume("/cache")) status = INSTALL_ERROR;
        if (copy_bak()) status = INSTALL_ERROR;
        if (status != INSTALL_SUCCESS) ui_print("Data wipe failed.\n");

添加函数
static int
copy_bak(void) {
    if (ensure_path_mounted("/data") !=0) {
        LOGE("ensure_path_mounted failed to mount \"%s\"\n", "/data");
        return -1;
    }

    if (ensure_path_mounted("/recovery-bak") !=0) {
        LOGE("ensure_path_mounted failed to mount \"%s\"\n", "/recovery-bak");
        return -1;
    }

    ZipArchive zip_bak;
    int err = mzOpenZipArchive("/recovery-bak/data-bak.zip", &zip_bak);
    if (err != 0) {
        LOGI("Can't open %s\n", "data-bak.zip");
        return -1;
    }
    else {
        LOGI("start copy bak\n");
        // To create a consistent system p_w_picpath, never use the clock for timestamps.
        struct utimbuf timestamp = { 1217592000, 1217592000 };  // 8/1/2008 default
        bool success = mzExtractRecursive(&zip_bak, "data", "/data",
                MZ_EXTRACT_FILES_ONLY, ×tamp,
                NULL, NULL);
        mzCloseZipArchive(&zip_bak);
        LOGI("copy bak %s\n",((success==true)?"success":"failed"));
        dirSetHierarchyPermissions("/data/app", 1000, 1000, 0771, 0644);
    }

    if (ensure_path_unmounted("/data") !=0) {
        LOGE("ensure_path_unmounted failed to unmount \"%s\"\n", "/data");
        return -1;
    }

    if (ensure_path_unmounted("/recovery-bak") !=0) {
        LOGE("ensure_path_unmounted failed to unmount \"%s\"\n", "/recovery-bak");
        return -1;
    }

    return 0;
}