*: Switch to python

src/profile.py

@@ -0,0 +1,49 @@
+import importlib.util
+from pathlib import Path
+from typing import Any
+
+from src.layout import Layout
+
+REQUIRED_KEYS = ("arch", "triple", "container_image")
+
+
+def _load_module(path: Path, name: str):
+    spec = importlib.util.spec_from_file_location(name, path)
+    if spec is None or spec.loader is None:
+        raise RuntimeError(f"cannot load profile module {path}")
+    mod = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(mod)
+    return mod
+
+
+def load_profile(layout: Layout) -> dict[str, Any]:
+    link = layout.profile_link
+    if not link.exists():
+        raise FileNotFoundError(f"{link} missing a profile")
+    target = link.resolve()
+    if not target.is_file():
+        raise FileNotFoundError(f"profile {target.name}: missing config.py")
+    mod = _load_module(target, f"orchid_profile_{target.name}")
+    if not hasattr(mod, "profile"):
+        raise AttributeError(f"profile {target.name}: config.py must define profile()")
+    data = mod.profile()
+    if not isinstance(data, dict):
+        raise TypeError(f"profile {target.name}: profile() must return a dict")
+    missing = [k for k in REQUIRED_KEYS if k not in data]
+    if missing:
+        raise ValueError(f"profile {target.name}: missing keys {missing}")
+    data["__name__"] = target.name
+    return data
+
+
+def init_build_dir(build: Path, repo: Path, profile_name: str) -> None:
+    profile_src = repo / "profiles" / (profile_name + ".py")
+    if not (profile_src).is_file():
+        raise FileNotFoundError(f"profile {profile_name!r} not found at {profile_src}")
+    build.mkdir(parents=True, exist_ok=False)
+    link = build / "profile"
+    # Use relative symlink so the build dir can be moved with the repo.
+    import os
+
+    rel = Path(os.path.relpath(profile_src, build))
+    link.symlink_to(rel)