Add CI tests for shared CCPP-physics and MOM6 submodule hash consistency

[Copilot]

Description

CCPP-physics is pinned in both UFS_Utils (sorc/ufs_utils.fd/ccpp-physics) and ufs-weather-model (via UFSATM at sorc/ufs_model.fd/UFSATM/ccpp/physics). When these diverge, build inconsistencies occur silently. Similarly, GDASApp/SOCA uses MOM6 from ufs-weather-model via a symlink in build.sh; if that relationship breaks, the build fails without a clear CI signal.

Changes

• dev/ci/scripts/unittests/test_submodule_hashes.py (new): Two pytest tests:

  • test_ccpp_physics_hashes_match — compares CCPP-physics commit hashes between sorc/ufs_utils.fd/ccpp-physics and sorc/ufs_model.fd/UFSATM/ccpp/physics using git ls-tree; fails when they differ
  • test_gdas_mom6_uses_ufs_model_mom6 — verifies sorc/gdas.cd/build.sh symlinks MOM6 from sorc/ufs_model.fd/MOM6-interface/MOM6 and that path is a registered submodule in ufs-weather-model; fails if the symlink target drifts or MOM6 is moved

  Both tests skip gracefully when required submodules are not initialized (e.g., minimal CI checkouts).

• .github/workflows/ci_unit_tests.yaml: Extends the submodule init step to include ufs_utils.fd, gdas.cd, and the nested ufs_model.fd/UFSATM submodule so the new tests are fully exercised in CI.

Resolves #4593

Type of change

• Bug fix (fixes something broken)
• New feature (adds functionality)
• Maintenance (code refactor, clean-up, new CI test, etc.)

Change characteristics

• Is this change expected to change outputs? NO
• Is this a breaking change? NO
• Does this change require a documentation update? NO
• Does this change require an update to any of the following submodules? NO

How has this been tested?

• Tests pass locally with current submodule hashes matching (7395db572d57af1118b9b524e8f8cda4e1cced4c for CCPP-physics in both repos)
• Failure path verified manually: a mismatched hash string produces a clear assertion failure with both hashes printed

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have documented my code, including function, input, and output descriptions
• My changes generate no new warnings
• New and existing tests pass with my changes
• This change is covered by an existing CI test or a new one has been added
• Any new scripts have been added to the .github/CODEOWNERS file with owners
• I have made corresponding changes to the system documentation if necessary

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/ufs-community/ufs-weather-model/git/trees/7b637a8b7d8e96c503b1719affaa647dea7b2631
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)
• noaa-nws-global-pds.s3.amazonaws.com
  • Triggering command: /usr/bin/python python -m pytest dev/ci/scripts/unittests/ -v --ignore=dev/ci/scripts/unittests/test_setup.py --ignore=dev/ci/scripts/unittests/test_create_experiment.py /opt/pipx_bin/git credential.helpetr (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add a CI test to verify common MOM6 and CCPP-physics hashes</issue_title>
<issue_description>### What new functionality do you need?

The CCPP-physics submodule exists in both UFS_Utils and ufs-weather-model. We should add a test to check whether that the hash in both modules are identical.

Similarly, the GDASApp and the ufs-weather model both have a MOM6 submodule. The CI test should also verify these are identical.

Acceptance Criteria

• A new CI test is authored
• It fails when the submodules differ
• It passes when they are the same

Suggest a solution (optional)

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add a CI test to verify common MOM6 and CCPP-physics hashes #4593

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.