From 1be36f656824965208e1b7a390ccf90cca2e4ecd Mon Sep 17 00:00:00 2001
From: Gabriele Bozzola <sbozzolator@gmail.com>
Date: Mon, 18 Sep 2023 14:14:28 -0700
Subject: [PATCH] Check if "ClimaCore version" is already attribute

HDF5.jl complains if you try writing an attribute that already exists
---
 src/InputOutput/writers.jl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/InputOutput/writers.jl b/src/InputOutput/writers.jl
index 29486ea897..3c25c30c85 100644
--- a/src/InputOutput/writers.jl
+++ b/src/InputOutput/writers.jl
@@ -59,7 +59,9 @@ function HDF5Writer(
     else
         file = h5open(filename, mode, context.mpicomm)
     end
-    write_attribute(file, "ClimaCore version", string(VERSION))
+    # Add an attribute to the file if it doesn't already exist
+    haskey(attributes(file), "ClimaCore version") &&
+        write_attribute(file, "ClimaCore version", string(VERSION))
     cache = Dict{String, String}()
     return HDF5Writer(file, context, cache)
 end