core: Arch: add .supported_binary() (MR 2474)

The .supported() method errs on the side of exposing too many
architectures to make porting for new or less-common platforms easier.

It therefore isn't suitable for using as a list of supported
architectures we can probe the binary repository for.

Introduce a .supported_binary() method to export only the architectures
where we have a binary repository.

Signed-off-by: Caleb Connolly <caleb@postmarketos.org>

pmb/core/arch.py

@@ -94,6 +94,18 @@ class Arch(enum.Enum):
             ]
         )
 
+    # FIXME: we should use pmaports.cfg "supported_arches" instead
+    @staticmethod
+    def supported_binary() -> set[Arch]:
+        """Officially supported architectures that have a binary repository"""
+        return {
+            Arch.armhf,
+            Arch.armv7,
+            Arch.aarch64,
+            Arch.x86_64,
+            Arch.x86,
+        }
+
     def kernel(self) -> str:
         match self:
             case Arch.x86:

pmb/helpers/repo.py

@@ -168,7 +168,7 @@ def update(arch: Arch | None = None, force: bool = False, existing_only: bool =
         return False
 
     # Architectures and retention time
-    architectures = [arch] if arch else Arch.supported()
+    architectures = [arch] if arch else Arch.supported_binary()
     retention_hours = pmb.config.apkindex_retention_time
     retention_seconds = retention_hours * 3600