1 files changed, 23 insertions, 17 deletions
diff --git a/pkgs/development/compilers/mint/crystal2nix.cr b/pkgs/development/compilers/mint/crystal2nix.cr
index 2ec8c92be3fb7..5d92ae4afeaec 100644
--- a/pkgs/development/compilers/mint/crystal2nix.cr
+++ b/pkgs/development/compilers/mint/crystal2nix.cr
@@ -1,27 +1,33 @@
 require "yaml"
+require "json"
+
+class PrefetchJSON
+  JSON.mapping(sha256: String)
+end
 
 File.open "shards.nix", "w+" do |file|
-  file.puts "{"
+  file.puts %({)
   yaml = YAML.parse(File.read("shard.lock"))
   yaml["shards"].each do |key, value|
-    file.puts "  #{key} = {"
-    file.puts %(    url = "https://github.com/#{value["github"]}";)
-    if value["commit"]?
-      file.puts %(    rev = "#{value["commit"]}";)
-    else
-      url = "https://github.com/#{value["github"]}"
-      ref = "v#{value["version"]}"
-
-      puts "git ls-remote #{url} #{ref}"
-      Process.run("git", args: ["ls-remote", url, ref]) do |x|
-        x.error.each_line { |e| puts e }
-        x.output.each_line { |o| value.as_h["commit"] = o.split("\t")[0] }
-      end
+    url = "https://github.com/#{value["github"]}"
+    rev = if value["version"]?
+            "v#{value["version"]}"
+          else
+            value["commit"].as_s
+          end
 
-      file.puts %(    rev = "#{value["commit"]};)
+    sha256 = ""
+    args = ["--url", url, "--rev", rev]
+    Process.run("nix-prefetch-git", args: args) do |x|
+      x.error.each_line { |e| puts e }
+      sha256 = PrefetchJSON.from_json(x.output).sha256
     end
 
-    file.puts "  };"
+    file.puts %(  #{key} = {)
+    file.puts %(    url = "#{url}";)
+    file.puts %(    rev = "#{rev}";)
+    file.puts %(    sha256 = "#{sha256}";)
+    file.puts %(  };)
   end
-  file.puts "}"
+  file.puts %(})
 end