Add Downgrade CI lane (containerized Core downgrade)#158
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ChrisRackauckas merged 1 commit intoJul 5, 2026
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FEniCS.jl is a PyCall wrapper around the Python FEniCS/DOLFIN FEM stack; its Core tests only load and run inside the cmhyett/julia-fenics:latest container (which the existing CI already uses). It nonetheless has real registry Julia dependencies with compat floors (PyCall, SpecialFunctions, ADTypes, OrdinaryDiffEq, OrdinaryDiffEqSDIRK, SciMLTesting), so a downgrade lane is meaningful. Route it through the centralized reusable workflow with the same container so the floors are actually build+tested against the Python runtime. Validated locally inside the container at Julia 1.10 (lts) with julia-downgrade-compat v2.6.1 floors: resolve + buildpkg + GROUP=Core test all green (Core 35/35 pass). Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
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Summary
FEniCS.jl had no Downgrade CI lane (audit: "wrapper; missing downgrade — confirm intentional or add a minimal one"). It's a PyCall wrapper around the Python FEniCS/DOLFIN FEM stack, so it looks exempt — but it still has real registry Julia dependencies with compat floors (
PyCall,SpecialFunctions,ADTypes,OrdinaryDiffEq,OrdinaryDiffEqSDIRK,SciMLTesting). A downgrade lane is therefore meaningful, and the centralized reusabledowngrade.ymlsupports acontainer:input precisely for Python-stack packages — the same container (cmhyett/julia-fenics:latest) the existingCI.ymlalready uses. So this is not a legitimate skip; it's a genuinely missing lane that can be added.This PR adds
.github/workflows/Downgrade.ymlrouted throughSciML/.github/.github/workflows/downgrade.yml@v1withgroup: Coreandcontainer: cmhyett/julia-fenics:latest.Validation (local, inside the real container)
Ran the centralized-workflow steps by hand inside
cmhyett/julia-fenics:latestat Julia 1.10 (lts, the downgrade default), usingjulia-actions/julia-downgrade-compatv2.6.1 indepsmode:downgrade.jlresolved minimal versions cleanly — PyCall 1.96.0, SpecialFunctions 1.6.1, Requires 1.0.0, ADTypes 1.7.1, OrdinaryDiffEq 6.80.0, OrdinaryDiffEqSDIRK 1.1.0, SciMLTesting 1.0.0.Pkg.build(PyCall linked to the container's/usr/bin/python3FEniCS) succeeded.GROUP=Core Pkg.testat floors: Core 35/35 pass (2m52s; the FEM examples JIT-compile and run against the real DOLFIN runtime).No source or compat-floor changes were needed — the existing floors are already downgrade-clean; the lane was simply absent.
Please ignore until reviewed by @ChrisRackauckas.
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