Opt users into using PPM when using default repos on Positron

[juliasilge]

We've gotten reports where this code opting users into PPM is not quite working on Positron:

renv/R/lockfile.R

Lines 52 to 58 in 8573b0d

	isdefault <-
	identical(repos, list(CRAN = "@CRAN@")) ||
	identical(repos, rstudio)
	if (isdefault) {
	repos[["CRAN"]] <- config$ppm.url()
	}

What we see in Positron for repos is this:

getOption("repos")
#>                        CRAN 
#> "https://cran.rstudio.com/"

^{Created on 2024-08-06 with reprex v2.1.1}

I think it doesn't have the attribute that RStudio adds on? We could add a "Positron" attribute to repos if that helps here.

I do want to note that on running renv::diagnostics(), the user in Positron saw this instead:

 $ repos                               : Named chr "https://cloud.r-project.org"
  ..- attr(*, "names")= chr "CRAN"

As a workaround for now, folks can manually set their repos:

options(repos = c(P3M = "https://packagemanager.posit.co/cran/latest"))

[kevinushey]

Having an attribute on the repos option set by Positron would definitely help. The idea here being, renv only wants to override the repositories to use P3M if it appears the repositories are the "default" value for the session; if the user has explicitly set their own custom repositories, then renv tries to leave it alone.

[DavisVaughan]

Random thought that maybe it would be best to choose an agnostic name for the attribute like IDE <- TRUE, or IDE <- "RStudio" / "Positron". Or even default <- TRUE

[juliasilge]

As of Positron 2024.09.0 build 27, this is new IDE attribute is now available:

getOption("repos")
#>                        CRAN 
#> "https://cran.rstudio.com/" 
#> attr(,"IDE")
#> [1] TRUE

^{Created on 2024-09-11 with reprex v2.1.1}