Does that suffice, or do you need a way to set this via an environment variable?

I've found myself in the situation where I would like to set these via an environment variable rather than via options() manually. The case is that I am calling R -f myfile.R which has an renv auto-loader. I want to inject an override depending on OS / arch. I would like to be able to support 2 or more repos (e.g. P3M and a custom r-universe repo) via env var.

I could imagine this looking like: RENV_CONFIG_REPOS_OVERRIDE=CRAN=https://p3m.dev/cran/__linux__/noble/latest;R_UNIV=https://r-arcgis.r-universe.dev

And parsing this from R:

Sys.setenv(
  RENV_CONFIG_REPOS_OVERRIDE = "CRAN=https://p3m.dev/cran/__linux__/noble/latest;R_UNIV=https://r-arcgis.r-universe.dev?example=query"
)

repos_override <- Sys.getenv("RENV_CONFIG_REPOS_OVERRIDE")
repos_raw <- strsplit(repos_override, ";")[[1]]

repos_parts <- regmatches(repos_raw, regexpr("=", repos_raw), invert = TRUE)

new_repos <- sapply(repos_parts, \(.repo) {
  setNames(.repo[2], .repo[1])
})

options(repos = new_repos)
getOption("repos")
#>                                            CRAN 
#>   "https://p3m.dev/cran/__linux__/noble/latest" 
#>                                          R_UNIV 
#> "https://r-arcgis.r-universe.dev?example=query"

^{Created on 2025-12-28 with reprex v2.1.1}

Feature request: multiple repos via renv.config.repos.override #716

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