jonkeane commented on code in PR #42210:
URL: https://github.com/apache/arrow/pull/42210#discussion_r1647508460


##########
r/tools/nixlibs.R:
##########
@@ -574,6 +574,8 @@ build_libarrow <- function(src_dir, dst_dir) {
         env_var_list <- c(env_var_list, setNames("BUNDLED", env_var))
       }
     }
+    # We also _do_ want to enable S3, GCS, and ZSTD by default
+    env_var_list <- c(env_var_list, c(ARROW_S3 = "ON", ARROW_GCS = "ON", 
ARROW_WITH_ZSTD = "ON"))

Review Comment:
   Ah, yes good catch



##########
r/tools/nixlibs.R:
##########
@@ -814,8 +816,14 @@ set_thirdparty_urls <- function(env_var_list) {
   env_var_list
 }
 
-is_feature_requested <- function(env_varname, default = 
env_is("LIBARROW_MINIMAL", "false")) {
-  env_value <- tolower(Sys.getenv(env_varname))
+is_feature_requested <- function(env_varname, env_var_list, default = 
env_is("LIBARROW_MINIMAL", "false")) {
+  # look in our env_var_list first, if it's not found there go to
+  # the actual environment
+  env_value <- tolower(env_var_list[[env_varname]])
+  if (is.null(env_value)) {
+    env_value <- tolower(Sys.getenv(env_varname))
+  }

Review Comment:
   AAAAH I was missing the `user-` part there, that makes it make more sense 
now.



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