Subject: Handle unknown platforms gracefully in loader.py
Origin: upstream, commit 0.4.27-32-g0a2fda3 <https://github.com/ahupp/python-magic/commit/0.4.27-32-g0a2fda3>
Author: Adam Hupp <adam@hupp.org>
Date: Sun May 26 01:01:34 2024 -0700

--- a/magic/loader.py
+++ b/magic/loader.py
@@ -49,7 +49,9 @@
         "darwin": _lib_candidates_macos,
         "linux": _lib_candidates_linux,
         "win32": _lib_candidates_windows,
-    }[sys.platform]
+    }.get(sys.platform)
+    if func is None:
+        raise ImportError("python-magic: Unsupported platform: " + sys.platform)
     # When we drop legacy Python, we can just `yield from func()`
     for path in func():
         yield path
@@ -65,4 +67,4 @@
                 pass
 
     # It is better to raise an ImportError since we are importing magic module
-    raise ImportError("failed to find libmagic.  Check your installation")
+    raise ImportError("python-magic: failed to find libmagic.  Check your installation")