feat: add a script to download bin libraries

tools/prep-lib.R

@@ -0,0 +1,99 @@
+check_sha256 <- function(file, sum, os = c("linux", "macos", "windows")) {
+  message("Checking SHA256 for <", file, ">...")
+
+  if (match.arg(os) == "linux") {
+    out <- system2("sha256sum", args = file, stdout = TRUE) |>
+      gsub(r"(\s.*)", "", x = _)
+  } else if (match.arg(os) == "macos") {
+    out <- system2("shasum", args = c("-a", "256", file), stdout = TRUE) |>
+      gsub(r"(\s.*)", "", x = _)
+  } else if (match.arg(os) == "windows") {
+    out <- system2("certutil", args = c("-hashfile", file, "SHA256"), stdout = TRUE)[2]
+  } else {
+    stop("Unsupported OS: ", os)
+  }
+
+  if (out != sum) {
+    stop(
+      "SHA256 mismatch for <", file, ">.\n",
+      "- Expected: ", sum, "\n",
+      "- Got:      ", out
+    )
+  }
+
+  message("SHA256 matches for <", file, ">.")
+
+  invisible()
+}
+
+which_os <- function() {
+  if (identical(.Platform$OS.type, "windows")) {
+    "windows"
+  } else if (Sys.info()["sysname"] == "Darwin") {
+    "macos"
+  } else if (R.version$os == "linux-gnu") {
+    "linux"
+  } else {
+    stop("Pre-built binaries are not available for OS: ", R.version$os)
+  }
+}
+
+which_arch <- function() {
+  if ((Sys.info()[["machine"]] %in% c("amd64", "x86_64", "x86-64"))) {
+    "x86_64"
+  } else if (Sys.info()[["machine"]] %in% c("arm64", "aarch64")) {
+    "aarch64"
+  } else {
+    stop("Pre-built binaries are not available for Arch: ", Sys.info()[["machine"]])
+  }
+}
+
+which_vendor_sys_abi <- function(os = c("linux", "macos", "windows")) {
+  if (match.arg(os) == "linux") {
+    "unknown-linux-gnu"
+  } else if (match.arg(os) == "macos") {
+    "apple-darwin"
+  } else if (match.arg(os) == "windows") {
+    "pc-windows-gnu"
+  } else {
+    stop("Unsupported OS: ", os)
+  }
+}
+
+current_os <- which_os()
+vendor_sys_abi <- which_vendor_sys_abi(current_os)
+current_arch <- which_arch()
+
+target_triple <- paste0(current_arch, "-", vendor_sys_abi)
+
+lib_data <- utils::read.table("tools/lib-sums.tsv", header = TRUE, stringsAsFactors = FALSE)
+
+package_name <- read.dcf("DESCRIPTION", fields = "Package", all = TRUE)
+lib_version <- read.dcf("DESCRIPTION", fields = sprintf("Config/%s/LibVersion", package_name), all = TRUE)
+lib_tag_prefix <- "lib-v"
+
+target_url <- sprintf(
+  "https://github.com/pola-rs/r-polars/releases/download/%s%s/libr_polars-%s-%s.tar.gz",
+  lib_tag_prefix,
+  lib_version,
+  lib_version,
+  target_triple
+)
+
+lib_sum <- lib_data |>
+  subset(url == target_url) |>
+  (\(x) x$sha256sum)()
+
+if (!length(lib_sum)) stop("No pre-built binary found at <", target_url, ">")
+
+message("Found pre-built binary at <", target_url, ">.\nDownloading...")
+
+destfile <- tempfile(fileext = ".tar.gz")
+on.exit(unlink(destfile))
+
+utils::download.file(target_url, destfile, quiet = TRUE, mode = "wb")
+check_sha256(destfile, lib_sum, os = current_os)
+
+utils::untar(destfile, exdir = "tools")
+
+message("Extracted pre-built binary to <", file.path(getwd(), "tools"), "> directory.")