FR: Introduce R-CMD-check-offline workflow?

[IndrajeetPatil]

The R-CMD-check-hard makes sure that all examples and tests that require suggested dependencies use them conditionally and with skip_if_not_installed(....), respectively.

In other words, you can use this workflow to find tests that should have skip_if_not_installed(....).

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Similar to this workflow, I was wondering if it might be a good idea to introduce R-CMD-check-offline workflow, which will make sure that all examples and tests that require internet access are being run conditional on internet access availability.

In other words, you can use this workflow to find tests that should have skip_if_offline().

If you agree, I'd also be happy to make a PR, but I am having a hard time figuring out how to mimic no internet access during R CMD check. Couldn't find anything relevant in {curl}.

[gaborcsardi]

I can see that this could be useful. OTOH we are starting to accumulate example workflows that are never tested, so their qualities might vary in the future.

I am not sure about the right solution for this, maybe we could create a separate repo, or have a separate directory, to make it clear which workflows are part of the "core".

As for the implementation, you could probably create a Docker container with all dependencies installed, and then run R CMD check, or the examples + vignettes + tests with the network disconnected from the container.

[gaborcsardi]

While this is a good idea, it didn't seem to get much traction, so I am going to close it now. Feel free to open another issue if you want to work on this.

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