assignUser commented on code in PR #38115:
URL: https://github.com/apache/arrow/pull/38115#discussion_r1355115123


##########
r/tools/nixlibs.R:
##########
@@ -103,6 +104,42 @@ download_binary <- function(lib) {
     }
     libfile <- NULL
   }
+  # 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")
+  # 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)

Review Comment:
   Yes I have an overall refactor planned as *libs.R are now sharing more and 
more logic (especially with the upcoming additons to the win build). Either 
refactor out common logic into a utils.R or so or unify both into libs.R?



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