karldw commented on a change in pull request #11001:
URL: https://github.com/apache/arrow/pull/11001#discussion_r698576926
##########
File path: r/R/install-arrow.R
##########
@@ -137,3 +136,64 @@ reload_arrow <- function() {
message("Please restart R to use the 'arrow' package.")
}
}
+
+
+#' Download all optional Arrow dependencies
+#'
+#' @param deps_dir Directory to save files into. Will be created if necessary.
+#' Defaults to the value of `ARROW_THIRDPARTY_DEPENDENCY_DIR`, if that
+#' environment variable is set.
+#'
+#' @return `deps_dir`, invisibly
+#'
+#' This function is used for setting up an offline build. If it's possible to
+#' download at build time, don't use this function. Instead, let `cmake`
+#' download them for you.
+#' If the files already exist in `deps_dir`, they will be re-downloaded and
+#' overwritten. Do not put other files in this directory.
+#' These saved files are only used in the build if `ARROW_DEPENDENCY_SOURCE`
+#' is `BUNDLED` or `AUTO`.
+#' https://arrow.apache.org/docs/developers/cpp/building.html#offline-builds
+#'
+#' Steps for an offline install with optional dependencies:
+#' - Install the `arrow` package on a computer with internet access
+#' - Run this function
+#' - Copy the saved dependency files to a computer without internet access
+#' - Create a environment variable called `ARROW_THIRDPARTY_DEPENDENCY_DIR`
that
+#' points to the folder.
+#' - Install the `arrow` package on the computer without internet access
+#' - Run [arrow_info()] to check installed capabilities
Review comment:
Sure! Subheading seem like a great idea. Something like this?
```r
#' ## Steps for an offline install with optional dependencies:
#'
#' ### On a computer with internet access:
#' - Install the `arrow` package
#' - Run this function
#' - Copy the saved dependency files to the computer with internet access
#'
#' ### On the computer without internet access:
#' - Create a environment variable called `ARROW_THIRDPARTY_DEPENDENCY_DIR`
that
#' points to the newly copied folder of dependency files.
#' - Install the `arrow` package
#' - Run [arrow_info()] to check installed capabilities
```
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