diff --git a/nix/lib/github/mkGithubJobsets.nix b/nix/lib/github/mkGithubJobsets.nix
index 2887e980..5b0e9550 100644
--- a/nix/lib/github/mkGithubJobsets.nix
+++ b/nix/lib/github/mkGithubJobsets.nix
@@ -7,6 +7,7 @@ in {
   mkGithubJobsets = {
     owner,
     repo,
+    legacy ? false,
   }:
     eachSystem (system: let
       pkgs = utils.pkgs.${system};
@@ -26,8 +27,12 @@ in {
             -H "Accept: application/vnd.github+json" \
             -H "Authorization: Bearer $token" \
             https://api.github.com/repos/${owner}/${repo}/branches \
-            -k \
-            | jq --arg o "${owner}" --arg r "${repo}" 'map({ key: .name, value: { "flake": ("github:" + $o + "/" + $r + "/" + .name) }}) | from_entries'
+            -k \ | jq '.
+              | map({ (.name): {
+                  "url": ("github:${owner}/${repo}/" + .name),
+                  "legacy": ${utils.lib.boolToString legacy}
+                }})
+              | add'
         '';
       });
 }
diff --git a/nix/lib/mkGitJobsets.nix b/nix/lib/mkGitJobsets.nix
index 9fd81ff6..e026be2b 100644
--- a/nix/lib/mkGitJobsets.nix
+++ b/nix/lib/mkGitJobsets.nix
@@ -4,26 +4,33 @@ utils: lib: let
     eachSystem
     ;
 in {
-  mkGitJobsets = url:
+  mkGitJobsets = {
+    url,
+    legacy ? false,
+  }:
     eachSystem (system: let
       pkgs = utils.pkgs.${system};
     in
       pkgs.writeShellApplication {
         name = "action";
-        runtimeInputs = [
-          pkgs.git
-          pkgs.gnused
-          pkgs.jq
-        ];
+        runtimeInputs = builtins.attrValues {
+          inherit
+            (pkgs)
+            git
+            gnused
+            jq
+            nix
+            ;
+        };
         text = ''
           heads=$(git ls-remote --heads ${url} | sed 's/.*refs\/heads\/\(.*\)/\1/')
-          cmd=""
-          for head in $heads
-          do
-            cmd="$cmd . += {\"$head\": { \"flake\": \"git+${url}?ref=$head\" } } |"
-          done
-          array=$(echo "{}" | jq "$cmd .")
-          echo "$array"
+          echo null | jq --arg heads "$heads" '$heads
+            | split("\n")
+            | map({(.): {
+                "url": ("git+${url}?ref=" + .),
+                "legacy": ${utils.lib.boolToString legacy}
+              }})
+            | add'
         '';
       });
 }