*: Switch to python

src/layout.py

@@ -0,0 +1,107 @@
+from dataclasses import dataclass
+from pathlib import Path
+
+
+@dataclass(frozen=True)
+class Layout:
+    """All filesystem paths used by the builder."""
+
+    repo: Path
+    build: Path
+
+    @property
+    def recipes_dir(self) -> Path:
+        return self.repo / "recipes"
+
+    @property
+    def host_recipes_dir(self) -> Path:
+        return self.repo / "host-recipes"
+
+    @property
+    def profiles_dir(self) -> Path:
+        return self.repo / "profiles"
+
+    @property
+    def dockerfile(self) -> Path:
+        return self.repo / "Dockerfile"
+
+    @property
+    def cache_dir(self) -> Path:
+        return self.repo / "cache"
+
+    @property
+    def tarball_cache(self) -> Path:
+        return self.cache_dir / "tarballs"
+
+    @property
+    def git_cache(self) -> Path:
+        return self.cache_dir / "git"
+
+    @property
+    def cache_lock(self) -> Path:
+        return self.cache_dir / ".lock"
+
+    @property
+    def sources_dir(self) -> Path:
+        return self.repo / "sources"
+
+    def source_tree(self, name: str, version: str) -> Path:
+        return self.sources_dir / f"{name}-{version}"
+
+    @property
+    def profile_link(self) -> Path:
+        return self.build / "profile"
+
+    @property
+    def build_workdirs(self) -> Path:
+        return self.build / "builds"
+
+    def build_workdir(self, name: str) -> Path:
+        return self.build_workdirs / name
+
+    @property
+    def host_pkgs_dir(self) -> Path:
+        return self.build / "host-pkgs"
+
+    def host_pkg_dir(self, name: str) -> Path:
+        return self.host_pkgs_dir / name
+
+    def host_pkg_marker(self, name: str, version: str, revision: int) -> Path:
+        return self.host_pkg_dir(name) / f".built-{version}-r{revision}"
+
+    @property
+    def pkgs_dir(self) -> Path:
+        return self.build / "pkgs"
+
+    def apk_path(self, output: str, version: str, revision: int) -> Path:
+        return self.pkgs_dir / f"{output}-{version}-r{revision}.apk"
+
+    @property
+    def apkindex(self) -> Path:
+        return self.pkgs_dir / "Packages.adb"
+
+    @property
+    def image_hash_file(self) -> Path:
+        return self.build / ".image-hash"
+
+    def ensure(self) -> None:
+        for p in (
+            self.cache_dir,
+            self.tarball_cache,
+            self.git_cache,
+            self.sources_dir,
+            self.build_workdirs,
+            self.host_pkgs_dir,
+            self.pkgs_dir,
+        ):
+            p.mkdir(parents=True, exist_ok=True)
+
+
+def find_repo_root(start: Path) -> Path:
+    cur = start.resolve()
+    for p in (cur, *cur.parents):
+        if (p / "Dockerfile").is_file() and (p / "profiles").is_dir():
+            return p
+    raise FileNotFoundError(
+        f"Could not find Orchid repo root (looking for Dockerfile + profiles/) from {start}"
+    )