Store packages on S3

[nanorepublica]

Currently pyshop defaults to storing packages locally on disk. This is not ideal if your server can be killed at random points (eg on any particular cloud service or with a new deployment)

The lines that currently enforce this behaviour are:

pyshop/pyshop/views/simple.py

Lines 111 to 136 in b60cb1b

	dir_ = os.path.join(settings['pyshop.repository'],
	filename[0].lower())
	if not os.path.exists(dir_):
	os.makedirs(dir_, 0o750)
	filepath = os.path.join(dir_, filename)
	while os.path.exists(filepath):
	if asbool(settings.get('pyshop.upload.never_overwrite', '0')):
	# policy: don't overwrite files that already exist in the repo
	raise exc.HTTPConflict(
	"Uploading version ({}) would overwrite existing file"
	.format(params['version']))
	log.warning('File %s exists but new upload self.request, deleting',
	filepath)
	os.unlink(filepath)
	size = 0
	with open(filepath, 'wb') as output_file:
	input_file.seek(0)
	while True:
	data = input_file.read(2 << 16)
	if not data:
	break
	size += len(data)
	output_file.write(data)

I would be great to have the storage mechanism as a configurable option rather than be forced to use local disk. I would suggest using this package (https://pypi.python.org/pypi/pyramid_storage/0.1.2) to abstract the storage mechanism to be configurable & extensible.