From e91f5cdd2dc78a38ff8b49aa5b711accb267a851 Mon Sep 17 00:00:00 2001
From: "Ian H. Pittwood" <ian.pittwood@posit.co>
Date: Thu, 19 Feb 2026 11:46:27 -0700
Subject: [PATCH] Add method to convert set options dictionary to string format
 for Docker Buildx Bake

---
 posit-bakery/posit_bakery/config/config.py   |  4 +---
 posit-bakery/posit_bakery/image/bake/bake.py | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/posit-bakery/posit_bakery/config/config.py b/posit-bakery/posit_bakery/config/config.py
index b7ec603c..d39ba68e 100644
--- a/posit-bakery/posit_bakery/config/config.py
+++ b/posit-bakery/posit_bakery/config/config.py
@@ -895,9 +895,7 @@ def build_targets(
             bake_plan = BakePlan.from_image_targets(context=self.base_path, image_targets=self.targets)
             set_opts = None
             if self.settings.temp_registry is not None and push:
-                set_opts = {
-                    "*.output": [{"type": "image", "push-by-digest": True, "name-canonical": True, "push": True}]
-                }
+                set_opts = {"*.output": {"type": "image", "push-by-digest": True, "name-canonical": True, "push": True}}
             bake_plan.build(
                 load=load,
                 push=push,
diff --git a/posit-bakery/posit_bakery/image/bake/bake.py b/posit-bakery/posit_bakery/image/bake/bake.py
index c014d7ef..383a6c99 100644
--- a/posit-bakery/posit_bakery/image/bake/bake.py
+++ b/posit-bakery/posit_bakery/image/bake/bake.py
@@ -188,6 +188,24 @@ def remove(self):
         """Delete the bake plan file if it exists."""
         self.bake_file.unlink(missing_ok=True)
 
+    @staticmethod
+    def _set_opts_dict_to_str(set_opts: dict[str, Any]) -> dict[str, str]:
+        """Convert a dictionary of set options to a comma-delimited, key=value string format for Docker Buildx Bake.
+
+        :param set_opts: A dictionary of set options to convert.
+
+        :return: A dictionary of set options with string values.
+        """
+        for opt, data in set_opts.items():
+            if isinstance(data, list):
+                set_opts[opt] = ",".join(data)
+            elif isinstance(data, dict):
+                set_opts[opt] = ",".join(f"{k}={v}" for k, v in data.items())
+            else:
+                set_opts[opt] = str(data)
+
+        return set_opts
+
     def build(
         self,
         load: bool = True,
@@ -214,6 +232,7 @@ def build(
             _set["*.cache-to"] = cache_to
         if set_opts:
             _set.update(set_opts)
+        _set = self._set_opts_dict_to_str(_set)
 
         python_on_whales.docker.buildx.bake(files=[self.bake_file.name], load=load, push=push, cache=cache, set=_set)
         if clean_bakefile: