prevent tile files from having 'units' attributes longer than 26 characters

gridded_glm/libexec/_minute_gridder.py

@@ -300,7 +300,7 @@ def get_cspp_gglm_version():
         return "unknown"
 
 
-def add_gglm_attrs(netcdf_filename, input_filenames):
+def add_cspp_attrs(netcdf_filename, input_filenames):
     try:
         nc = Dataset(netcdf_filename, 'a')
         setattr(nc, 'cspp_geo_gglm_version', get_cspp_gglm_version())
@@ -310,6 +310,17 @@ def add_gglm_attrs(netcdf_filename, input_filenames):
     except:
         log.error("could not add CSPP Geo GGLM attributes to {}".format(netcdf_filename))
 
+def awipsify_file_attributes(netcdf_filename):
+    try:
+        nc = Dataset(netcdf_filename, 'a')
+        for var in nc.variables:
+            if hasattr(var, 'units'):
+                # AWIPS requires the units attribute to be 26 characters or less
+                setattr(var, 'units', getattr(var, 'units')[0:26])
+        nc.close()
+    except:
+        log.error("could not tweak attributes on tile file {}".format(netcdf_filename))
+
 def alarm_handler(signum, frame):
   raise OSError("Timeout exceeded!")
 
@@ -352,7 +363,7 @@ if __name__ == '__main__':
     # we need to add attributes here due to an issue where satpy (or its dependencies) are
     # holding the input gridded file open until the process exits
     for f in gridded_files:
-        add_gglm_attrs(f, glm_filenames)
+        add_cspp_attrs(f, glm_filenames)
 
     # (optionally) do tiling
     if args.create_tiles:
@@ -394,7 +405,8 @@ if __name__ == '__main__':
     tiled_path = os.path.join(tempdir_path, '{}_GLM-L2-GLM*-M?_G??_T??_*.nc'.format(args.system_environment_prefix_tiles))
     tiled_files = glob(tiled_path)
     for f in tiled_files:
-        add_gglm_attrs(f, glm_filenames)
+        add_cspp_attrs(f, glm_filenames)
+        awipsify_file_attributes(f)
         shutil.move(f, os.path.join(args.output_dir, os.path.basename(f)))
     for f in gridded_files:
         shutil.move(f, os.path.join(args.output_dir, os.path.basename(f)))