askpass() in RStudio Rmd on Windows

[gaborcsardi]

Just returns NULL without a dialog, at least on R-devel and win 2022. It aborted my Windows 8.1 in VirtualBox, but that's probably a different issue.

Do reproduce create a new Rmd, and insert a chunk like this:

```{r}
askpass::askpass()
```

and then save it and click the Knit button.

[gaborcsardi]

Probably the same happens in Jupyter: r-lib/keyring#118

[jeroen]

Hmm I don't have any win2022 here to test. I can try to setup a vm. If you want to help debug this one that would be great :)

[gaborcsardi]

I don't think you need 2022. I think any windows will do. I can try to debug it as well.

[jeroen]

OK well the fact that it returns NULL in a non-interactive environment is intended I think? We don't want it to hang a headless script or server setting.

If it aborts windows that would be very bad.

[gaborcsardi]

Right. OTOH, it would be nice to be able to override this. Some of our packages have a function like this:

❯ cli:::is_interactive
function() {
  opt <- getOption("rlib_interactive")
  if (isTRUE(opt)) {
    TRUE
  } else if (identical(opt, FALSE)) {
    FALSE
  } else if (tolower(getOption("knitr.in.progress", "false")) == "true") {
    FALSE
  } else if (tolower(getOption("rstudio.notebook.executing", "false")) == "true") {
    FALSE
  } else if (identical(Sys.getenv("TESTTHAT"), "true")) {
    FALSE
  } else {
    interactive()
  }
}

So we could set an option if we want to force a password prompt from a non-interactive session.

[jeroen]

OK yes feel free to add that.

I think there is another problem but probably unrelated to yours, that causes the credentials vignette to hang on the new win2022 CRAN machine: https://cran.r-project.org/web/checks/check_results_credentials.html

I suspect it is somehow prompting for user input when running the vignette.

[gaborcsardi]

Yeah, so the Knitr button runs the Rmd in a non-interactive session. So this is not specific to Windows at all.

I was mislead because when running keyring::key_get() on macOS the keyring unlock dialog is handled by the OS, so works in non-interactive sessions, but on Windows keyring itself creates a dialog via askpass, and that does not work.

I'll submit a PR in a sec.