In [email protected], the esmx tool was added and it looks like it is always built (i.e. no optional component/variant):

https://github.com/esmf-org/esmf/blob/v8.4.0/makefile

esmx depends on py-pyyaml (and therefore python) at runtime. The minimum Python version in spack is 3.7, and lacking any further information on the Python requirements for esmx (see https://earthsystemmodeling.org/docs/nightly/develop/ESMF_usrdoc), I simply added python and py-pyyaml as dependencies.

If any of the ESMF developers knows better which versions of python and py-pyyaml are required, please let me know!

@danrosen25 - do you know specifics about versions required by ESMX? Thanks.

ESMX is code only and doesn't get built until the end user executes a build command using ESMX. I don't know specific version requirements for python and py-pyaml. I recommend using the current default spack versions and then we can test the spack installation in a container.

My system is using the following

• Python 3.9.6 (XCode command line tools)
• PyYAML 6.0.1 (pip default)

GitHub runners are using the following

• Python 3.10.12 (GitHub admins)
• PyYAML ?

ESMF Docker Container

• Python 3.8.10 (apt-get defaults on ubuntu 20.04)
• PyYAML 6.0.1 (pip default)

Thanks, py-pyyaml@6 is available in spack and used in our environments. To be on the safe side, should I pin python to @3.8: (i.e. 3.8 or newer) and py-pyyaml to @6:?

If you give me the exact default versions for spack then I'll test them out in a container but it will take some time for me to get to the testing.

If you give me the exact default versions for spack then I'll test them out in a container but it will take some time for me to get to the testing.

Default for python is 3.11.7, and for py-pyyaml 6.0.1

On my local system I use ESMX successfully with Python 3.6.12 and PyYAML 5.3.1. Seems that just using Spack defaults as Dan suggested might suffice.

Perfect, then this is ready ;-)

And if you're looking for minimums as opposed to defaults then Gerhard wins with the earliest versions that we've tested.

• Python 3.6.12
• PyYAML 5.3.1

These changes have been pulled into #45504 - closing. Thanks for your feedback!