只读文件系统：'/srv/media/house_preview/question_4.PNG'

Question

我有一个简单的 Django 应用程序部署到 App Engine，它连接到 Cloud SQL (PostgreSQL) 实例。 这个 Django 应用程序允许用户登录/注册并发布待售商品。 登录/注册工作正常，但在出售商品时出现以下错误：

Request Method: POST
    Django Version: 3.0.3
    Python Version: 3.7.7
    Installed Applications:
    ['projects',
     'blog',
     'users.apps.UsersConfig',
     'crispy_forms',
     'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles']
    Installed Middleware:
    ['django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware']



    Traceback (most recent call last):
      File "/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
        response = get_response(request)
      File "/env/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
        response = self.process_exception_by_middleware(e, request)
      File "/env/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
        response = wrapped_callback(request, *callback_args, **callback_kwargs)
      File "/env/lib/python3.7/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
        return view_func(request, *args, **kwargs)
      File "/srv/projects/views.py", line 28, in createListing
        link.save()
      File "/srv/projects/models.py", line 24, in save
        super(Listing_Database, self).save(*args, **kwargs)
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 746, in save
        force_update=force_update, update_fields=update_fields)
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 784, in save_base
        force_update, using, update_fields,
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 887, in _save_table
        results = self._do_insert(cls._base_manager, using, fields, returning_fields, raw)
      File "/env/lib/python3.7/site-packages/django/db/models/base.py", line 926, in _do_insert
        using=using, raw=raw,
      File "/env/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method
        return getattr(self.get_queryset(), name)(*args, **kwargs)
      File "/env/lib/python3.7/site-packages/django/db/models/query.py", line 1204, in _insert
        return query.get_compiler(using=using).execute_sql(returning_fields)
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1383, in execute_sql
        for sql, params in self.as_sql():
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1328, in as_sql
        for obj in self.query.objs
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1328, in <listcomp>
        for obj in self.query.objs
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1327, in <listcomp>
        [self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
      File "/env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1278, in pre_save_val
        return field.pre_save(obj, add=True)
      File "/env/lib/python3.7/site-packages/django/db/models/fields/files.py", line 288, in pre_save
        file.save(file.name, file.file, save=False)
      File "/env/lib/python3.7/site-packages/django/db/models/fields/files.py", line 87, in save
        self.name = self.storage.save(name, content, max_length=self.field.max_length)
      File "/env/lib/python3.7/site-packages/django/core/files/storage.py", line 52, in save
        return self._save(name, content)
      File "/env/lib/python3.7/site-packages/django/core/files/storage.py", line 267, in _save
        fd = os.open(full_path, self.OS_OPEN_FLAGS, 0o666)

    Exception Type: OSError at /projects/createListing
    Exception Value: [Errno 30] Read-only file system: '/srv/media/house_preview/question_4.PNG'

我很确定这与图片上传有关。

Answer 1

不允许写入 Google App Engine 实例，如果您想要 Google 中的所有内容，则应使用 Google Cloud Storage realm

编辑您的代码以支持不同的 Google 云存储后端 -> 例如使用django-storage

Answer 2

除了/tmp目录外，无法在 Google App Engine 标准 Python3 环境中写入文件。 正如Python3 GAE 官方文档中所述：

运行时包括一个完整的文件系统。 文件系统是只读的，但位置/tmp除外，它是一个虚拟磁盘，用于在您的 App Engine 实例的 RAM 中存储数据。