upgraded copy method

deck/fs.py

@@ -40,12 +40,27 @@ def umount_sd(path='/sd'):
       sd_ok = False
   return sd_ok
 
-# TODO: switch to buffered copying to avoid RAM overflow
-def copy(p1, p2):
-  with open(p1, 'rb') as f1:
-    content = f1.read()
-    with open(p2, 'wb') as f2:
-      f2.write(content)
+def copy(source_path, dest_path, buffer_size=8192):
+  """
+  Copies a file from source_path to dest_path
+  """
+  try:
+    with open(source_path, "rb") as src:
+      with open(dest_path, "wb") as dst:
+        while True:
+          # Read a chunk from the source
+          buffer = src.read(buffer_size)
+          if not buffer:
+            break
+          # Write the chunk to the destination
+          dst.write(buffer)
+    return True
+  except OSError as e:
+    print(f"Error copying file: {e}")
+    return False
+  except Exception as e:
+    print(f"An unexpected error occurred: {e}")
+    return False
 
 cp = copy # shortcut export