Add Azure Linux 4 to libraries Helix extra-platforms (linux_x64)

[richlander]

Note

This PR description was AI/Copilot-generated.

Adds Azure Linux 4 to the libraries Helix extra-platforms queue set for linux_x64 (CoreCLR inner-loop) in eng/pipelines/libraries/helix-queues-setup.yml.

Replaces #127613, which got tangled up in merge history. This is a clean, single-commit version with the digest refreshed to the current azurelinux-4.0-helix-amd64 image (sha256:d86d3499…).

Change

File	Distro	Slot	Action
eng/pipelines/libraries/helix-queues-setup.yml	AzureLinux 4.0	extra-platforms linux_x64	Added

Queue entry:

(AzureLinux.4.0.Amd64.Open)AzureLinux.3.Amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-4.0-helix-amd64@sha256:d86d3499ccba1cc92ad045fbd3e055fdde21ed5c757f25d1245fea978711b3a6

Host queue is AzureLinux.3.Amd64.Open, matching the other container-backed entries in the same section (Debian 13, Fedora 44, openSUSE 16.0).

Scope

helix-platforms.yml is intentionally not updated — those values are reserved for GA releases, and Azure Linux 4 has not yet GA'd. This change only adds opt-in coverage via the extra-platforms pipeline.

CI

/azp run runtime-extra-platforms

References

• Add Azure Linux 4 to libraries Helix extra-platforms (linux_x64) #127613 (previous attempt)
• OS onboarding guide
• .NET OS Support Tracking

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[richlander]

@vcsjones @wfurt -- I messed up the PR and it got locked so I'm starting again. Oops!

[richlander]

/azp run runtime-extra-platforms

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[github-actions]

🤖 Copilot Code Review — PR #127842

Note

This review was generated by GitHub Copilot.

Holistic Assessment

Motivation: Adding Azure Linux 4 to the libraries Helix extra-platforms queue is a justified step in expanding OS test coverage for .NET runtime CI. Azure Linux 4 is the next version of the platform and validating libraries against it early is reasonable.

Approach: The change adds a single container-based queue entry following the exact same pattern as existing entries (Debian 13, Fedora 44, openSUSE 16), using AzureLinux 3 as the host queue with an AzureLinux 4 container image pinned by SHA256 digest. This is the correct, low-risk approach — scoped to extra-platforms inner-loop only.

Summary: ✅ LGTM. This is a minimal, well-structured infrastructure change that follows established patterns precisely, maintains alphabetical ordering, and is appropriately scoped to the extra-platforms inner-loop tier for initial coverage.

---

Detailed Findings

✅ Format and pattern consistency

The new entry at line 64 follows the established (QueueName)HostQueue@container-image@sha256:digest format identically to its sibling entries. The host queue (AzureLinux.3.Amd64.Open) matches what all other container-based entries in this section use.

✅ Alphabetical ordering maintained

The entry is correctly placed first in the extra-platforms list: AzureLinux → Debian → Fedora → openSUSE. This follows the convention ("Sort lists and entries alphabetically").

✅ Appropriate placement scope

The entry is gated behind isExtraPlatformsBuild: true and testScope != 'outerloop', meaning it only runs on extra-platforms inner-loop builds. This is the appropriate tier for introducing new OS coverage before promoting to broader runs.

💡 Coverage limited to linux_x64 CoreCLR libraries only (follow-up, not blocking)

This PR only adds Azure Linux 4 coverage for the linux_x64 platform in the libraries CoreCLR path. If ARM64 coverage or coverage in other pipeline files (coreclr tests, mono) is desired, those would be natural follow-ups. This is noted as context, not a blocking concern — incremental rollout is the right approach.

Generated by Code Review for issue #127842 · ◷

[Copilot]

Pull request overview

Adds Azure Linux 4 coverage to the libraries linux_x64 Helix extra-platforms path for CoreCLR inner-loop runs. This broadens opt-in OS validation in runtime-extra-platforms without changing the main/GA platform aliases.

Changes:

• Add an Azure Linux 4 queue entry to the libraries linux_x64 extra-platforms/CoreCLR queue set.
• Pin the new azurelinux-4.0-helix-amd64 container image by digest while keeping the existing Azure Linux 3 host queue.
• Leave the general linux_x64 queue set and eng/pipelines/helix-platforms.yml unchanged.

[richlander]

@wfurt -- Looks clean. Just need an approval now. Much thanks for the help. Also to @vcsjones

[richlander]

/ba-g "Unrelated failures"

[richlander]

This pipeline is the one to look at and is green: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1409747&view=logs&jobId=803b4c9b-c8dc-5f8e-c2da-4890c86ff82f&j=803b4c9b-c8dc-5f8e-c2da-4890c86ff82f&t=b981e634-422d-532f-0103-2cf28078ad75