From 20c5343cd8498d9b0d4b53c1aa568bb6e3272f91 Mon Sep 17 00:00:00 2001
From: Alex Lowe <alex.lowe@canonical.com>
Date: Mon, 15 Jul 2024 19:02:54 -0400
Subject: [PATCH] fix(flask): include cargo build-dep

---
 charmcraft/extensions/gunicorn.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/charmcraft/extensions/gunicorn.py b/charmcraft/extensions/gunicorn.py
index a1e3f7101..b8a43299c 100644
--- a/charmcraft/extensions/gunicorn.py
+++ b/charmcraft/extensions/gunicorn.py
@@ -223,6 +223,12 @@ def is_experimental(base: tuple[str, ...] | None) -> bool:  # noqa: ARG004
         """Check if the extension is in an experimental state."""
         return False
 
+    @override
+    def get_parts_snippet(self) -> dict[str, Any]:
+        """Return the parts to add to parts."""
+        # rust is needed to build pydantic-core, a dependency of flask.
+        return {"rust-deps": {"build-packages": ["cargo"]}}
+
 
 class DjangoFramework(_GunicornBase):
     """Extension for 12-factor Django applications."""