Support Dry-run

[kairos03]

Before uploading a new package, I want to ensure that the version does not already exist.

To do this, I typically use the --strict option with upload and immediately delete the package afterward.

However, I believe this is not the best approach. Could you introduce a --dry-run option to merely check if the new version upload will cause a conflict?

If possible, I want to work on it. TX

[mdwint]

Hello @kairos03. I'm open to this feature, and you're welcome to work on it.

Implementation hint: Try subclassing S3Storage and stub out all put/delete methods:

s3pypi/s3pypi/storage.py

Lines 85 to 102 in f1d2e3c

	def put_index(self, directory: str, index: Index) -> None:
	self._object(directory, self.index_name).put(
	Body=index.to_html(),
	ContentType="text/html",
	CacheControl="public, must-revalidate, proxy-revalidate, max-age=0",
	**self.cfg.put_kwargs, # type: ignore
	)
	def put_distribution(self, directory: str, local_path: Path) -> None:
	with open(local_path, mode="rb") as f:
	self._object(directory, local_path.name).put(
	Body=f,
	ContentType="application/x-gzip",
	**self.cfg.put_kwargs, # type: ignore
	)
	def delete(self, directory: str, filename: str) -> None:
	self._object(directory, filename).delete()

The put methods can be changed to register if puts were attempted. At the end you can check the result and return the appropriate exit code.