Retire the Singularity wrapper#1371
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The Singularity wrapper has been classified as community-supported since the 26.07 release, and Enroot/Pyxis is the release-validated container runtime for Slurm in DeepOps. The upstream Singularity project has also split and continues as Apptainer (https://apptainer.org/), so the vendored wrapper no longer tracks a single maintained upstream. Remove the wrapper and its wiring: - Delete roles/singularity_wrapper and playbooks/container/singularity.yml. - Drop the "Install Singularity" import and slurm_cluster_install_singularity gating from playbooks/slurm-cluster.yml. - Remove slurm_cluster_install_singularity and the Singularity/golang vars from the example configs and the virtual cluster vars. - Remove the gantsign.golang Galaxy role, which existed only to build Singularity from source for this wrapper and has no other consumer. - Delete the Singularity-specific rootless prolog/epilog scripts (prolog.d/95-all-rootless and epilog.d/95-lastuserjob-rootless), which invoked `singularity config fakeroot`; the Enroot prolog/epilog scripts are unaffected. - Update docs to point at Enroot/Pyxis as the supported Slurm container runtime and note that Singularity lives on as Apptainer for sites that want it. The Open OnDemand Linux-host adapter and the HPL benchmark example still support a site-provided Apptainer/Singularity binary and are left in place.
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Summary
singularity_wrapperrole, its install playbook andslurm-cluster.ymlwiring, thegantsign.golangGalaxy dependency (verified sole consumer), the Singularity-specific rootless prolog/epilog scripts (singularity config fakerootmanagement — no Enroot equivalent), and the example variables.--container-imageinvocation, and a note points sites that want Singularity to its upstream continuation, Apptainer.Validation
git diff --check; YAML parse of all changed files; full role lint (0 failures);playbooks/slurm-cluster.ymlsyntax check passes with the Galaxy role uninstalled.