OSX reports arm64 (Linux reports aarch64)

repo2docker/utils.py

@@ -537,6 +537,10 @@ def get_platform():
     if m == "x86_64":
         return "linux/amd64"
     elif m == "aarch64":
+        # Linux reports aarch64
+        return "linux/arm64"
+    elif m == "arm64":
+        # OSX reports arm64
         return "linux/arm64"
     else:
         warnings.warn(f"Unexpected platform '{m}', defaulting to linux/amd64")

tests/unit/test_utils.py

@@ -168,6 +168,7 @@ def test_local_pip_requirement(req, is_local):
     [
         ("x86_64", "linux/amd64"),
         ("aarch64", "linux/arm64"),
+        ("arm64", "linux/arm64"),
         ("other", "linux/amd64"),
     ],
 )