tinyfs: fetch file utility (#12719)

extra/tinyfs/fetch_file.py

@@ -0,0 +1,11 @@
+from tinygrad.tensor import Tensor
+import argparse
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser()
+  parser.add_argument("hash", type=str, required=True, help="file hash to fetch")
+  parser.add_argument("len", type=int, required=True, help="file length to fetch")
+  parser.add_argument("dest", type=str, required=True, help="destination path to save the file")
+  args = parser.parse_args()
+
+  Tensor(bytes.fromhex(args.hash), device="CPU").load(args.len).to(f"disk:{args.dest}").realize()