python312Packages.ray: add prefetch.sh script

pkgs/development/python-modules/ray/prefetch.sh

@@ -0,0 +1,28 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i sh -p jq
+
+outfile="ray-hashes.nix"
+# Clear file
+echo "" >$outfile
+
+prefetch() {
+    package_attr="python${1}Packages.ray"
+    echo "Fetching hash for $package_attr on $2"
+
+    expr="(import <nixpkgs> { system = \"$2\"; }).$package_attr.src.url"
+    url=$(NIX_PATH=.. nix-instantiate --eval -E "$expr" | jq -r)
+
+    sha256=$(nix-prefetch-url "$url")
+    hash=$(nix hash convert --to sri --hash-algo sha256 "$sha256")
+
+    echo -e "  cp${1} = \"${hash}\";" >>$outfile
+    echo
+}
+
+for system in "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"; do
+    echo "${system} = {" >>$outfile
+    for python_version in "39" "310" "311" "312"; do
+        prefetch "$python_version" "$system"
+    done
+    echo "};" >>$outfile
+done