Feature request: add `--dry-run` equivalent parameter about gh-action-pypi-publish HOT 8 CLOSED

This action wraps twine under the hood, which doesn't (currently) have a --dry-run or equivalent flag. I think it probably makes sense to try and have that kind of behavior upstreamed first so that gh-action-pypi-publish can re-expose it 🙂

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I mean that checking the version is something for the underlying tool (Twine) to consider as it'd be something people would want to do locally and on other platforms (like GitLab).

Having it specific to GitHub Action does would mean that each of the other platforms would also need to reinvent the wheel. This project is meant as a thin wrapper, not a place for heavy features.

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Okay, I will see what is possible using upstream

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FTR, here's the endpoint that can potentially be used for the version presence: https://warehouse.pypa.io/api-reference/json.html#get--pypi--project_name---version--json.

Although, I don't know if it covers the case of a removed version (the releases are immutable and you cannot re-upload the same version/filename post removal, even if the project was deleted and the ownership changed).

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Doesn't seem likely to happen since they closed this issue pypa/twine#207

Mostly I want to check:

• Will authentication succeed?
• Does the package version already exist?

It should be noted that the npm publish --dry-run command does neither of those things so is basically useless as far as I can tell, but whatever.

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Ah yeah, I remember the rationale there: there's a good argument that twine (and this workflow) really don't do much at all on their own, so users who want to exercise them are better off running the full workflow against TestPyPI or similar rather than adding a new --dry-run mode.

However, given that TestPyPI has its own credentials and package namespace, using it to test for authentication/package existence is kind of moot...

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• Does the package version already exist?

Adding to what William said, this doesn't seem like something that should be specific to only one ecosystem wrapper (GitHub Action).

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@webknjaz what do you mean?

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