CARRY: ci(agentic-ci): lint Rust in the autofix sandbox overlay

[andre-motta]

Summary

Midstream-only (autofix sandbox overlay). agentic-ci 0.5.4 adds a rust toolchain, the read-only crates egress preset and gcc in the sandbox images, so the overlay can drop its blanket Rust skip.

• Toolchain and egress: rust: auto (reads channel = "1.95.0" from rust-toolchain.toml) and the crates preset.
• Setup:
  • rust-crates: cargo fetch --locked for every tracked Cargo.lock, and a pass-through sccache in ~/.local/bin, because mise.toml sets RUSTC_WRAPPER=sccache for every mise run and sccache is a GitHub download no preset opens.
  • rust-warm: runs mise run rust:lint once before the agent so clippy after the agent (and the agent's own clippy runs) only rebuild what changed. A failure there is ignored; the cache is the point.
  • mise install is retried up to 3 times for transient Go fetch failures (connect: resource temporarily unavailable).
• Validate: rust-format (mise run rust:format:check) and rust-lint (mise run rust:lint).
• Skips: narrowed to rust:deny, cargo deny, test:rust, cargo nextest and rust:verify:*.
• discard_before_download: the four target/ directories.

Test plan

Nested OpenShell runs (openshell:0.5.4, codex-sandbox:0.5.4, agentic-ci's steps-run e2e driver):

• rust 1.95.0 provisioned from rust-toolchain.toml; cargo fetch for all 9 lockfiles through the crates preset in about 50 s; rust-format passed; the agent sees the catalog cargo and gcc; target/ was discarded.
• The workspace clippy did not finish within 3600 s on that workstation, which was out of memory and swap at the time; upstream's Rust lint job takes about 4.5 minutes on an 8-CPU runner with a warm cache. The first production autofix run on this repo will show the real warm-up time; if it is too slow, the fix is central (sandbox resources in autofix.json).

Refs RHAI-2621, RHAI-5153

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Automated checks now validate Rust formatting and linting, helping maintain consistent code quality.
  • Build setup retries tool installation when attempts fail and prepares dependencies and build caches, making validation more resilient. If all installation attempts fail, setup exits unsuccessfully. Rust build output directories are cleared before build artifacts are downloaded.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Central YAML (base), Organization UI (inherited)
• Review profile: CHILL
• Plan: Enterprise
• Run ID: 174d9096-0977-4389-b6f2-21059155e036

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Reviewing files that changed from the base of the PR and between af1db54 and a770eb1.

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• .agentic-ci/config.yml

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📝 Walkthrough

Walkthrough

The sandbox configuration adds Rust toolchain selection and crates egress. Setup retries mise installation, fetches dependencies for tracked Cargo.lock files, and runs rust:lint to warm the build cache. Validation adds Rust format and lint checks. The Rust task skip rule is narrower, and four Rust target directories are discarded before download.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

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Merge Risk: ⚪ Minimal · up to a770e

No demonstrated issue blocks merging. The first production run will establish the Rust warm-up time.

🚥 Pre-merge checks | ✅ 10

✅ Passed checks (10 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the CI change: adding Rust linting to the agentic-ci autofix sandbox overlay. It is concise and specific.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Contribution Quality And Spam Detection		PASS: The PR changes one CI overlay file and adds Rust toolchain, dependency-fetch, warm-up, validation, retry, skip, and artifact-discard configuration. The description is specific to this repository…
No Hardcoded Secrets		No hardcoded secret is introduced. The only changed file is .agentic-ci/config.yml; its added values contain tool versions, package coordinates, task names, paths, and a pass-through shell wrapper. …
No Weak Cryptography		No banned cryptographic primitive, custom cryptography, or secret comparison was introduced. The only changed file is .agentic-ci/config.yml; its new sccache entry is a pass-through compiler wrapp…
No Injection Vectors		No CWE-78, CWE-89, CWE-94, CWE-502, or CWE-79 injection vector is introduced. The changed file is CI shell configuration. The generated sccache wrapper uses a static script and quoted "$@"; tracke…
No Privileged Containers		No privileged container condition is introduced. The PR changes only .agentic-ci/config.yml, a CI sandbox overlay, and the diff contains no privileged: true, host namespace flags, SYS_ADMIN, `al…
No Sensitive Data In Logs		No changed logging statement exposes sensitive data. The added messages log only machine architecture, retry count, and lint exit status. The new setup commands do not print passwords, tokens, API key…

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[coderabbitai]

Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @.agentic-ci/config.yml:
- Line 113: Update the rust-warm step’s `mise run rust:lint` handling to remain
non-blocking while preserving its exit status and reporting that status without
attributing every failure to lint; keep independent validation unchanged.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Central YAML (base), Organization UI (inherited)
• Review profile: CHILL
• Plan: Enterprise
• Run ID: 6be7ced8-bafc-4f30-8d43-36e67aa11f80

📥 Commits

Reviewing files that changed from the base of the PR and between 47dc122 and af1db54.

📒 Files selected for processing (1)

• .agentic-ci/config.yml

Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 11 remain after this review.