From 5fc48d57ca130bcfc8ec9fb5db94560f04560280 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Mon, 22 Aug 2022 17:38:53 -0700
Subject: [PATCH] rewrite update script from scratch to use curl/jq

---
 .gitignore   |  3 +-
 default.nix  |  8 ++---
 sources.json |  2 +-
 update       | 86 +++++++++++++++++++++-------------------------------
 4 files changed, 42 insertions(+), 57 deletions(-)

diff --git a/.gitignore b/.gitignore
index 2943858..9383d16 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-sources.json.bak
+sources.old.json
+sources.new.json
diff --git a/default.nix b/default.nix
index 3a75af1..ae59c73 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,8 @@
 { pkgs ? import <nixpkgs> {},
   system ? builtins.currentSystem }:
 
-let inherit (pkgs) lib;
+let
+  inherit (pkgs) lib;
   releases = builtins.fromJSON (lib.strings.fileContents ./sources.json);
   installPhase = ''
     mkdir -p $out/{doc,bin,lib}
@@ -10,8 +11,7 @@ let inherit (pkgs) lib;
     cp -r lib/* $out/lib
     cp zig $out/bin/zig
   '';
-
-in lib.attrsets.mapAttrs (k: v: 
+in lib.attrsets.mapAttrs (k: v:
   if k == "master" then
     lib.attrsets.mapAttrs (k: v:
       (pkgs.stdenv.mkDerivation {
@@ -38,4 +38,4 @@ in lib.attrsets.mapAttrs (k: v:
       dontFixup = true;
       installPhase = installPhase;
     })
-  releases
\ No newline at end of file
+  releases
diff --git a/sources.json b/sources.json
index 4599d5c..3e996bb 100644
--- a/sources.json
+++ b/sources.json
@@ -2502,4 +2502,4 @@
       "sha256": "16b0e1defe4c1807f2e128f72863124bffdd906cefb21043c34b673bf85cd57f"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/update b/update
index 832d014..c272bb8 100755
--- a/update
+++ b/update
@@ -1,57 +1,41 @@
 #!/usr/bin/env nix-shell
-#! nix-shell -p ruby -i ruby
+#! nix-shell -p curl jq -i sh
 
-require 'net/http'
-require 'json'
-require 'pathname'
-require 'fileutils'
+# Build our new sources.json
+curl -s 'https://ziglang.org/download/index.json' | jq '
+["aarch64-linux", "x86_64-linux", "aarch64-macos", "x86_64-macos"] as $targets |
+def todarwin(x): x | gsub("macos"; "darwin");
+def toentry(vsn; x):
+  [(vsn as $version |
+    .value |
+    to_entries[] |
+    select(.key as $key | any($targets[]; . == $key)) | {
+      (todarwin(.key)): {
+          "url": .value.tarball,
+          "sha256": .value.shasum,
+          "version": $version,
+      }
+    }
+  )] | add;
 
-ZIG_URI = URI("https://ziglang.org/download/index.json")
-DEFAULT_SYSTEMS = ["x86_64-linux", "aarch64-linux", "aarch64-darwin", "x86_64-darwin"]
+to_entries[] | {
+    (.key): (
+        if (.key != "master") then
+          toentry(.key; .value)
+        else {
+          "latest": toentry(.value.version; .value),
+          (.value.date): toentry(.value.version; .value),
+        } end
+    )
+}
+' > sources.new.json
 
-response = JSON.parse(Net::HTTP.get(ZIG_URI))
-sources = if Pathname.new("sources.json").exist?
-            JSON.parse(File.read("sources.json"))
-          else
-            { "master" => {} }
-          end
+# For debugging
+# cat sources.new.json
+# exit
 
-# Update versions
-response.each do |k, v|
-  unless k == "master"
-    sources[k] = DEFAULT_SYSTEMS.to_h do |system|
-      data = if system == "x86_64-darwin"
-               response[k]["x86_64-macos"] or {}
-             elsif system == "aarch64-darwin"
-               response[k]["aarch64-macos"] or {}
-             else
-               response[k][system] or {}
-             end
-      [system, { "url" => data["tarball"],
-                 "version" => k,
-                 "sha256" => data["shasum"] }]
-    end
-  end
-end
+# Copy the old file since jq can't modify in-place. This is also a backup.
+cp sources.json sources.old.json
 
-# Update master
-sources["master"][response["master"]["date"]] = DEFAULT_SYSTEMS.to_h do |system|
-  data = if system == "x86_64-darwin"
-           response["master"]["x86_64-macos"]
-         elsif system == "aarch64-darwin"
-           response["master"]["aarch64-macos"]
-         else
-           response["master"][system]
-         end
-  [system, { "url" => data["tarball"],
-             "version" => response["master"]["version"],
-             "sha256" => data["shasum"] }]
-end
-sources["master"]["latest"] = sources["master"][response["master"]["date"]]
-
-FileUtils.cp "sources.json", "sources.json.bak"
-File.write "sources.json", JSON.pretty_generate(sources)
-
-# Local Variables:
-# mode: ruby
-# End:
+# Recursive merge
+jq -s '.[0] * .[1]' sources.old.json sources.new.json > sources.json