Cylc 8 with LFRic Rose stem and Python issues

[oliver.sanders]

Hello,

This error is happening because you have some Python 3.7 files in your PYTHONPATH which are messing with the Cylc environment.

To fix, try running Cylc in a clean environment.

# NOTE: Met Office specific
module purge

Unfortunately there isn’t much we can do to improve this error message as the Cylc wasn’t able to load.

The LFric rose-stem suites require a few small changes to make them Cylc 8 compatible. Andrew C has a branch where he’s made some progress on this.

For general info, here are the changes made so far:

• rose-stem options
  • --name → --workflow-name
  • --define-suite → -S (this is a Rose bug, we will reinstate the --define-suite argument soon)
  • --config <path> → <path> (now a positional argument).
  • Remove --new & --no-gcontrol.
• cylc play
  • The rose stem command now only installs the workflow.
  • Add cylc play <workflow-name> after the rose stem command to make it run.
• cylc gscan
  • This GUI has been replaced by the web GUI (cylc gui).
  • For a light-weight CLI alternative try cylc scan.
• Jinja2
  • Globals:
    • Apply this one-line patch to fix a Jinja2 issue: Cylc 8 with LFRic Rose stems and Jinja2 issues - #4 by oliver.sanders
  • variables
    • The disabled variable (used for xc40 configs) is invalid.
    • I don’t understand how this worked at Cylc 7.
    • Quoting the value suppresses the error: ...=disabled → ...='disabled',
• ROSE_ORIG_HOST
  • Tasks for the SPICE platform had [remote]host set to ROSE_ORIG_HOST.
  • This tells Cylc to perform an unnecessary SSH. This doesn’t work at Cylc 8.
  • Easy fix, change ROSE_ORIG_HOST → 'localhost' for SPICE sections in a Jinja2 file somewhere.

A long list but it boils down to a small diff. With that the rose-stem suites tested so far validate and run under Cylc 8.