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POUploading to Google Cloud Storage from Django on App Engine
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copied!<p>I'm using Django 1.5 on Google App Engine and I'm trying to upload files to Google Cloud Storage. I'm using the gcs the library and have written a custom file upload handler that I've registered in settings.py as my only file uploader. I can see my file being correctly uploaded in the blobstore viewer in my development environment but once form.save() is called in views.py I get an exception thrown saying that it's a read only file system? I know Google App Engine doesn't allow access to the file system which is why I'm using GCS in the first place!</p> <p>Is there something I need to do to stop Django from trying to save the file to disk?</p> <p>The relevant code is attached in this <a href="https://gist.github.com/jamesrwhite/781ae448ed58e8423e01" rel="noreferrer">gist</a>.</p> <p>Thanks :)</p> <p>Stack Trace:</p> <pre><code>Environment: Request Method: POST Request URL: http://localhost:8080/cms/media/add Django Version: 1.5 Python Version: 2.7.5 Installed Applications: ('django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.staticfiles', 'django.contrib.messages', 'api', 'cms', 'frontend') Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware') Traceback: File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/core/handlers/base.py" in get_response 115. response = callback(request, *callback_args, **callback_kwargs) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/contrib/auth/decorators.py" in _wrapped_view 25. return view_func(request, *args, **kwargs) File "/Users/james/Dropbox/University/Year 4/Advanced Development/assignment/cms/views.py" in media_add_or_edit 44. form.save() File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/forms/models.py" in save 370. fail_message, commit, construct=False) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/forms/models.py" in save_instance 87. instance.save() File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/base.py" in save 546. force_update=force_update, update_fields=update_fields) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/base.py" in save_base 650. result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/manager.py" in _insert 215. return insert_query(self.model, objs, fields, **kwargs) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/query.py" in insert_query 1673. return query.get_compiler(using=using).execute_sql(return_id) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/sql/compiler.py" in execute_sql 936. for sql, params in self.as_sql(): File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/sql/compiler.py" in as_sql 894. for obj in self.query.objs File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/fields/files.py" in pre_save 250. file.save(file.name, file, save=False) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/db/models/fields/files.py" in save 86. self.name = self.storage.save(name, content) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/core/files/storage.py" in save 48. name = self._save(name, content) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/django-1.5/django/core/files/storage.py" in _save 198. fd = os.open(full_path, flags, 0o666) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/devappserver2/python/stubs.py" in fake_open 71. raise OSError(errno.EROFS, 'Read-only file system', filename) Exception Type: OSError at /cms/media/add Exception Value: [Errno 30] Read-only file system: u'/Users/james/Dropbox/University/Year 4/Advanced Development/assignment/IMG_0746.jpg' </code></pre>

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