XIOS aborts during context initialisation due to undefined field - `lfric_atm`

[oakleybrunt]

Version

main

Are there any linked Issues or Pull Requests?

No response

What happened?

During some experiments into XIOS XML settings, I turned on par_access="independent". This caused an error when running lfric_atm with oper_diags_hres optional configuration.

XIOS aborts during context initialisation with the following error:

In file "field.cpp", function "void xios::CField::solveGridReference()", line 1605
-> A grid must be defined for field '__field_undef_id_19' .

This presented in file_def_diags_ver.xml which references cloud__cloud_base_altitude (not defined in the current METADATA field definitions). Since this is a dangling field_ref, nothing is inherited, so XIOS cannot solve the grid reference.

I think commenting out the two references (lfric_ver_tp0 and lfric_ver field groups) rather than deleting them (so they can be restored if the diagnostic is added to METADATA) is probably the best way forward.

I also audited the remaining field_ref ids used by enabled files and this is the only missing one.

The same reference also exists in file_def_diags_ral.xml, file_def_diags_idealised.xml and file_def_diags_ls_and_jedi.xml. Those are not included by the affected iodef and are left unchanged, but will hit the same error if run against the lfric_atm metadata.

Relevant log output

In file "field.cpp", function "void xios::CField::solveGridReference()",  line 1605 -> A grid must be defined for field '__field_undef_id_19' .