From dde6654bdb9d69960077d95f2715fc29ef1024d9 Mon Sep 17 00:00:00 2001
From: Keir Fraser <keir.xen@gmail.com>
Date: Sat, 28 Sep 2024 08:08:43 +0100
Subject: [PATCH] img: Alow auto-detected formats to be overridden on command
 line

---
 src/greaseweazle/image/img.py | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/greaseweazle/image/img.py b/src/greaseweazle/image/img.py
index 76f5c70b..99dc1a4f 100644
--- a/src/greaseweazle/image/img.py
+++ b/src/greaseweazle/image/img.py
@@ -100,11 +100,10 @@ def format_from_file(name: str) -> str:
     @classmethod
     def from_file(cls, name: str, fmt: Optional[codec.DiskDef],
                   opts: OptDict) -> Image:
-        error.check(fmt is None,
-                    f'{cls.__name__}: Format cannot be overridden')
-        format_str = cls.format_from_file(name)
-        fmt = codec.get_diskdef(format_str)
-        print(f'{cls.__name__}: Image format {format_str}')
+        if fmt is None:
+            format_str = cls.format_from_file(name)
+            fmt = codec.get_diskdef(format_str)
+            print(f'{cls.__name__}: Image format {format_str}')
         return super().from_file(name, fmt, opts)
 
 # Local variables: