Permission denied Error during SAm_4km_RA2T_um_surf_ostia step

Unified Model
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1

I am running suite u-dx731 on ARCHER2, which is itself a copy of u-ds822, which runs fine on my colleagues’ setup.

When I run u-dx731, I get the following error during the SAm_4km_RA2T_um_surf_ostia step of the workflow. This is the entirety of the job.err file:

The following have been reloaded with a version change:
  1) cce/16.0.1 => cce/15.0.0     2) cray-mpich/8.1.27 => cray-mpich/8.1.23

[FAIL] [Errno 13] Permission denied: './rose-app-run.confUXDj4n'
2026-03-19T14:38:40Z CRITICAL - failed/ERR

It seems to have a permission error when writing a temporary file. I assume there must be an incorrect setting somewhere in my configuration which is causing it to try and write to a directory I do not own, but I can’t work out even which directory it is trying to write to.

Any help or suggestions welcome.

Scott

2

Hi Scott,

Can you point to the log file where you see this error?

Thanks,

Annette

3

Hi Annette,

Thank you for getting back so quickly.

You can find it here on ARCHER2:

/home/n02/n02/scottan/cylc-run/u-dx731/run1/log/job/20091009T0000Z/SAm_4km_RA2T_um_surf_ostia/03

Many thanks,

Scott

4

Hi Annette,

I’ve been able to identify what the issue was and get past this step.

The job script, generated from /home/n02/n02/scottan/roses/u-dx731/suite-runtime/lam.rc contained this line:

cd /work/n02/n02/lowe/ancils/original_run/u-cr358 && . ./ancil_versions

Which seems necessary because ancil_versions uses pwd to work out the path to the ancils. I would have thought avoiding use of pwd in ancil_versions would be cleaner code and avoid these kinds of errors.

Anyway, it doesn’t seem to leave that directory and I don’t have write access to it, so at some point it fails. I added the line:

cd ${CYLC_RUN_DIR}/${CYLC_WORKFLOW_ID}

afterwards which seems to have worked - it’s ended up making a copy of rose-app-run.conf in /work/n02/n02/scottan/cylc-run/u-dx731/run1 which I hope is harmless.

This let me get past this error anyway, but let me know if you can think of a cleaner solution.