В Thu, 30 May 2024 11:12:05 +0200 Héctor Meleiro Suárez <hmelei...@gmail.com> пишет:
> So why is this a problem? Is it that there are too many files aftes > examples and tests are run? or would this NOTE be an issue to CRAN > even if only one file was detected at the end? This problem has two sides. The side that R CMD check is giving you NOTEs about is that _examples and tests_ are requried to keep the global state of the system intact. This includes all files on the computer: writing anywhere except the tempdir() is prohibited, and even that must be done with care not to overwrite anything and cleaned up afterwards. (See https://cran.r-project.org/web/packages/policies.html and search for "temporary directory".) The side that's more subjective is that outside tests and examples, code shouldn't be touching the filesystem without the user's permission. Many functions (e.g. write.table()) have a legitimate need to alter the filesystem. If the user would legitimately benefit from not having to download the files again (including between R sessions), feel free to follow the advice of Thierry Onkelinx and use tools::R_user_dir(...), except in tests and examples. Testing functions that access external resources over the Internet is fraught with additional peril. Your examples and tests must not fail if a download attempt fails, but your users will probably prefer your functions to stop() with an exception on download failure. One way to solve this problem is to make sure that the functions that fetch anything from the Internet raise errors with a specific class set and then to wrap all examples and tests in tryCatch(..., yourpackage_Internet_error = function(e) message('Caught an error while accessing an Internet resource: ', conditionMessage(e))). This way any other unchecked errors (that your tests attempt to uncover) will still surface. -- Best regards, Ivan ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
