Nothing
the$curl_valid <- new.env(parent = emptyenv())
renv_curl_exe <- function() {
curl <- Sys.getenv("RENV_CURL_EXECUTABLE", unset = NA)
if (is.na(curl))
curl <- Sys.which("curl")
if (!nzchar(curl))
return(renv_curl_exe_missing(curl))
renv_curl_validate(curl)
}
renv_curl_validate <- function(curl) {
the$curl_valid[[curl]] <- the$curl_valid[[curl]] %||% {
renv_curl_validate_impl(curl)
}
}
renv_curl_validate_impl <- function(curl) {
# make sure we can run this copy of curl
# note that 'system2()' will give an error if curl isn't runnable at all
output <- suppressWarnings(
tryCatch(
system2(
command = curl,
args = "--version",
stdout = TRUE,
stderr = TRUE
),
error = identity
)
)
if (!inherits(output, "error")) {
status <- attr(output, "status") %||% 0L
if (status == 0L)
return(curl)
}
message <- if (inherits(output, "error"))
conditionMessage(output)
else
output
fmt <- "Error executing '%s --version': is your copy of curl functional?"
footer <- sprintf(fmt, curl)
all <- c("", header(paste(curl, "--version"), prefix = "$"), message, "", footer)
defer(
message(paste(all, collapse = "\n")),
scope = renv_dynamic_envir()
)
return(curl)
}
renv_curl_exe_missing <- function(curl) {
if (!once())
return(invisible(curl))
parts <- c(
"curl does not appear to be installed; downloads will fail.",
"See <https://rstudio.github.io/renv/articles/renv.html#downloads> for more information."
)
msg <- paste(parts, collapse = "\n")
warning(msg, call. = FALSE)
invisible(curl)
}
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