From 4e5dc19f3fe8c1b7df31539ca5d958c47825f7bc Mon Sep 17 00:00:00 2001
From: Julian Hofer <julianhofer@gnome.org>
Date: Wed, 15 Apr 2026 16:25:57 +0200
Subject: [PATCH] flatten v1 staging outputs before rendering

rattler-build --render-only drops staging outputs, hiding their
build and host requirements from the dependency graph. Flatten the
recipe text first so pinning and arch migrations see the full
requirement surface.
---
 conda_forge_tick/utils.py         |  8 +++-
 environment.yml                   |  2 +-
 tests/test_recipe_yaml_parsing.py | 63 +++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+), 2 deletions(-)

diff --git a/conda_forge_tick/utils.py b/conda_forge_tick/utils.py
index 391b42cf8..804642fdd 100644
--- a/conda_forge_tick/utils.py
+++ b/conda_forge_tick/utils.py
@@ -35,6 +35,7 @@
     run_container_operation,
     should_use_container,
 )
+from rattler_build_conda_compat.outputs import flatten_staging_inheritance
 
 from . import sensitive_env
 from .lazy_json_backends import LazyJson
@@ -521,7 +522,12 @@ def _render_recipe_yaml(
             else ["--target-platform", platform_arch]
         )
 
-        prepared_text = replace_compiler_with_stub(text)
+        stubbed_text = replace_compiler_with_stub(text)
+        # rattler-build --render-only drops staging outputs and does not
+        # propagate their build/host requirements into inheriting outputs,
+        # so flatten them first to keep the dep graph complete for pinning
+        # and arch migrations.
+        prepared_text = flatten_staging_inheritance(stubbed_text)
 
         res = subprocess.run(
             ["rattler-build", "build", "--render-only"]
diff --git a/environment.yml b/environment.yml
index fd88674f5..63ef6c4e4 100644
--- a/environment.yml
+++ b/environment.yml
@@ -52,7 +52,7 @@ dependencies:
   - python-dateutil
   - python-graphviz
   - rattler-build >=0.58.3,<0.60
-  - rattler-build-conda-compat >=1.4.6,<2,!=1.4.7,!=1.4.8
+  - rattler-build-conda-compat >=1.4.13,<2
   - requests
   - ruamel.yaml
   - ruamel.yaml.jinja2
diff --git a/tests/test_recipe_yaml_parsing.py b/tests/test_recipe_yaml_parsing.py
index 3f95e5181..de041188f 100644
--- a/tests/test_recipe_yaml_parsing.py
+++ b/tests/test_recipe_yaml_parsing.py
@@ -200,3 +200,66 @@ def test_populate_feedstock_attributes(recipe_name):
         assert isinstance(value, set)
         for el in value:
             assert isinstance(el, str)
+
+
+def test_populate_feedstock_attributes_staging_outputs():
+    """Build/host deps declared in a staging output must appear in the
+    parsed feedstock attributes, otherwise pinning migrations won't
+    know that this feedstock needs to be rebuilt.
+    """
+    recipe_text = """\
+outputs:
+  - staging:
+      name: shared-build
+    source:
+      url: https://example.com/foo-1.0.tar.gz
+      sha256: "0000000000000000000000000000000000000000000000000000000000000000"
+    requirements:
+      build:
+        - cxx_compiler_stub
+      host:
+        - cudnn 9.*
+        - python
+  - package:
+      name: foo
+      version: "1.0"
+    inherit: shared-build
+    requirements:
+      host:
+        - numpy
+      run:
+        - python
+        - numpy
+about:
+  license: MIT
+  summary: test
+"""
+
+    with TemporaryDirectory() as tmpdir:
+        os.makedirs(Path(tmpdir) / "recipe", exist_ok=True)
+        os.makedirs(Path(tmpdir) / ".ci_support", exist_ok=True)
+        (Path(tmpdir) / "recipe" / "recipe.yaml").write_text(recipe_text)
+        (Path(tmpdir) / ".ci_support" / "linux_64_.yaml").write_text("""\
+target_platform:
+  - linux-64
+""")
+        node_attrs = populate_feedstock_attributes(
+            "foo",
+            {},
+            recipe_yaml=recipe_text,
+            feedstock_dir=tmpdir,
+        )
+
+    build_reqs = node_attrs["total_requirements"]["build"]
+    assert "cxx_compiler_stub" in build_reqs
+
+    host_reqs = node_attrs["total_requirements"]["host"]
+    # from staging
+    assert "cudnn 9.*" in host_reqs
+    assert "python" in host_reqs
+    # from the package output itself
+    assert "numpy" in host_reqs
+
+    run_reqs = node_attrs["total_requirements"]["run"]
+    assert "python" in run_reqs
+    assert "numpy" in run_reqs