jonkeane commented on code in PR #39587:
URL: https://github.com/apache/arrow/pull/39587#discussion_r1451770201


##########
r/tools/nixlibs.R:
##########
@@ -96,53 +96,76 @@ try_download <- function(from_url, to_file, hush = quietly) 
{
   !inherits(status, "try-error") && status == 0
 }
 
-download_binary <- function(lib) {
-  libfile <- paste0("arrow-", VERSION, ".zip")
-  binary_url <- paste0(arrow_repo, "bin/", lib, "/arrow-", VERSION, ".zip")
-  if (try_download(binary_url, libfile)) {
-      lg("Successfully retrieved libarrow (%s)", lib)
-  } else {
-      lg(
-        "Downloading libarrow failed for version %s (%s)\n    at %s",
-        VERSION, lib, binary_url
-      )
-    libfile <- NULL
-  }
+try_checksum <- function(binary_url, libfile, hush = quietly) {
   # Explicitly setting the env var to "false" will skip checksum validation
   # e.g. in case the included checksums are stale.
   skip_checksum <- env_is("ARROW_R_ENFORCE_CHECKSUM", "false")
   enforce_checksum <- env_is("ARROW_R_ENFORCE_CHECKSUM", "true")
   checksum_path <- Sys.getenv("ARROW_R_CHECKSUM_PATH", "tools/checksums")
   # validate binary checksum for CRAN release only
-  if (!skip_checksum && dir.exists(checksum_path) && is_release ||
-    enforce_checksum) {
-    checksum_file <- sub(".+/bin/(.+\\.zip)", "\\1\\.sha512", binary_url)
-    checksum_file <- file.path(checksum_path, checksum_file)
-    checksum_cmd <- "shasum"
-    checksum_args <- c("--status", "-a", "512", "-c", checksum_file)
-
-    # shasum is not available on all linux versions
-    status_shasum <- try(
-      suppressWarnings(
-        system2("shasum", args = c("--help"), stdout = FALSE, stderr = FALSE)
-      ),
-      silent = TRUE
-    )
+  # we do this in a try so that if it fails for any reason, we don't pollute 
the log
+  # but then we will return that the checksum failed
+  status <- try(
+    {
+      if (!skip_checksum && dir.exists(checksum_path) && is_release ||
+        enforce_checksum) {
+        checksum_file <- sub(".+/bin/(.+\\.zip)", "\\1\\.sha512", binary_url)
+        checksum_file <- file.path(checksum_path, checksum_file)
+        checksum_cmd <- "shasum"
+        checksum_args <- c("--status", "-a", "512", "-c", checksum_file)
+
+        # shasum is not available on all linux versions, so check help if it 
exists
+        status_shasum <- try(
+          suppressWarnings(
+            system2("shasum", args = c("--help"), stdout = FALSE, stderr = 
FALSE)
+          ),
+          silent = TRUE
+        )
 
-    if (inherits(status_shasum, "try-error") || is.integer(status_shasum) && 
status_shasum != 0) {
-      checksum_cmd <- "sha512sum"
-      checksum_args <- c("--status", "-c", checksum_file)
-    }
+        # if shasum doens't exist, then change the command to sha512sum
+        if (inherits(status_shasum, "try-error") || is.integer(status_shasum) 
&& status_shasum != 0) {
+          checksum_cmd <- "sha512sum"
+          checksum_args <- c("--status", "-c", checksum_file)
+        }

Review Comment:
   I'm not going to resolve this yet, but I've updated the logic here to 
simplify. @assignUser could you take a look and ensure that this new flow is 
matching what your intent was in the first round?



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