build: make sccache and fast linkers repository defaults - #1870
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Included review availability: Your plan provides up to 8 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughChangesThe repository centralizes Rust linker and sccache configuration through Cargo drivers. It adds platform bootstrap and Windows short-path setup, updates CI images and cache keys, changes release workflows, documents the policy, and expands validation tests. Build and linker configuration
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Cargo
participant cargo_linker
participant LinkerProbeCache
participant PlatformLinker
Cargo->>cargo_linker: Invoke target linker driver
cargo_linker->>LinkerProbeCache: Read linker identity result
LinkerProbeCache-->>cargo_linker: Return usable or incompatible status
cargo_linker->>PlatformLinker: Probe or link with selected linker
cargo_linker-->>Cargo: Execute selected compiler and linker
Merge Risk: 🔵 Low · up to The runtime seed canary queries the wrong cache key and reports an inconclusive result instead of validating the expected cache. Preserve the validated key before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 5.08% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 59 functions across 19 files. (3 skipped: 3 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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The protected PR planner requires `ci/ownership.yml` and `ci/slices.yml` to match the default branch byte for byte. This prerequisite publishes the routing data needed by #1870 so that the feature branch can be rebased and validated. - register the Windows short-path action under the Windows platform domain - repin the four Linux runtime rows to the promoted mold/sccache runner cohort This is the repository's documented sequenced-maintainer-merge path for catalog evolution. The catalog PR's own Plan checks are expected to reject the source/default mismatch until it lands. Validation: 53 planner/lane contract tests passed; `just ci-crate-lists` passed. Co-authored-by: scama <a1860575018c4680d5669dd7bc3bd356b478bccb8d42e194df46304a5e25f49a@meshllm.communities.buzz.xyz>
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Inline comments:
In @.github/workflows/release.yml:
- Line 862: Add the pinned mozilla-actions/sccache-action setup used by the
other release build jobs before prepare-host-input in build_linux_arm64,
ensuring the sccache executable is available before any Rust build runs.
In `@ci/slices.yml`:
- Around line 200-203: Promote the matching runtime slice catalog entries,
including linux-cpu, linux-cuda, linux-rocm, and linux-vulkan, to the protected
default branch through the required catalog-only promotion path, then rebase
this branch so plan-ci compares identical catalogs. Preserve the existing
byte-for-byte comparison contract and do not relax it.
In `@scripts/bootstrap-build-tools.ps1`:
- Around line 19-20: Update the sccache installation flow in the bootstrap
script to save the existing RUSTC_WRAPPER value, temporarily clear it for the
cargo install command, and restore the original value in a finally block,
including preserving an initially unset variable.
In `@scripts/cargo-linker`:
- Around line 163-165: Update the scripts/package-native-runtime.sh target
handling and scripts/cargo-linker compiler selection to prevent
cross-architecture linking: either reject targets that differ from the host
architecture or select the appropriate target compiler driver instead of always
invoking host cc. Preserve normal same-architecture linking and ensure the guard
applies before incompatible link inputs reach cc.
In `@scripts/cargo-linker.cmd`:
- Line 25: Update the cargo-linker.cmd forwarding logic around the "%MESH_LLD%"
invocation to disable cmd.exe delayed expansion before passing linker arguments,
preserving arguments containing exclamation marks unchanged.
In `@scripts/runtime-seed-canary.py`:
- Line 16: Update the canary cache baseline associated with IMAGE to the current
published seed: regenerate KEY, VERSION, CACHE_ID, and CACHE_SIZE for the
f499b79b v3 image so preflight() accepts the seed recipe.
In `@scripts/tests/test_build_accelerator_defaults.py`:
- Line 20: Extend the linker-override scan in the test covering
scripts/cargo-linker to reject Cargo -C linker= forms, including clang, and
CARGO_TARGET_*_LINKER environment-variable overrides in addition to fuse-ld=lld.
Preserve the existing rejection behavior and ensure workflow configurations
using either RUSTFLAGS or target linker variables cannot bypass the configured
linker.
In `@scripts/tests/test_runner_image_identity.py`:
- Line 106: Update the test setup around the public-cpu image provenance
mutation to keep provenance valid, so the pairing failure remains the reason the
test passes or fails. Add a separate test case that explicitly covers missing
provenance and verifies the corresponding receipt-validation behavior.
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.agents/skills/manage-ci/references/current-inventory.md.cargo/config.toml.github/actions/compute-changes/derive-outputs.sh.github/actions/setup-macos-lld/action.yml.github/actions/setup-windows-short-paths/action.yml.github/workflows/cache-warm-sccache.yml.github/workflows/ci-linux-host-slice.yml.github/workflows/ci-linux-product-slice.yml.github/workflows/ci-linux-runtime-slice.yml.github/workflows/ci-platform-checks-slice.yml.github/workflows/ci-quality-slice.yml.github/workflows/ci-rust-tests-slice.yml.github/workflows/ci-ui-artifact-slice.yml.github/workflows/ci-web-slice.yml.github/workflows/ci-windows-host-slice.yml.github/workflows/ci-windows-runtime-slice.yml.github/workflows/depot-canary.yml.github/workflows/hf-download-smoke.yml.github/workflows/llama-upstream-canary.yml.github/workflows/native-sdk-artifact.yml.github/workflows/nightly-kv-coverage.yml.github/workflows/nightly-stability-run.yml.github/workflows/node-sdk-addon-artifact.yml.github/workflows/product-integration-smoke.yml.github/workflows/release.yml.github/workflows/resume-crates-release.yml.github/workflows/scripted-binary-smoke.yml.github/workflows/sdk-smoke.yml.github/workflows/smoke.yml.github/workflows/static-abi-artifact.yml.github/workflows/website-pages.yml.github/workflows/windows-warm-caches.ymlCONTRIBUTING.mdREADME.mdci/ci.mdci/ownership.ymlci/runner-image-evidence/82ce86fd271ad275c0a7a5d6016aa6a56eee75c7a941a2ada1e54e97750827bb.jsonci/runner-images.jsonci/slices.ymljust/build.justscripts/bootstrap-build-toolsscripts/bootstrap-build-tools.ps1scripts/build-host.shscripts/build-llama.shscripts/build-windows.ps1scripts/cargo-linkerscripts/cargo-linker.cmdscripts/lib/lld.shscripts/package-native-runtime.shscripts/runtime-seed-canary.pyscripts/tests/test_build_accelerator_defaults.pyscripts/tests/test_ci_artifact_actions.pyscripts/tests/test_ci_native_toolchain_routing.pyscripts/tests/test_ci_sdk_producers.pyscripts/tests/test_justfile_layout.pyscripts/tests/test_kv_nightly_workflow_contract.pyscripts/tests/test_llama_upstream_canary_contract.pyscripts/tests/test_lld_lib.pyscripts/tests/test_package_native_runtime.pyscripts/tests/test_release_workflow_artifacts.pyscripts/tests/test_runner_image_identity.pyscripts/tests/test_sccache_evidence.pytools/xtask/src/publish_consistency.rs
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🤖 Prompt for all review comments with AI agents
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Inline comments:
In `@ci/ci.md`:
- Line 574: Update the sccache/Linux linker policy sentence in ci.md to state
that Linux final links prefer the probed mold driver but fall back to a
compatible lld or the platform linker when mold probing fails.
After applying the fix, consider running `coderabbit review --agent` for local
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🤖 Prompt for all review comments with AI agents
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minimal, and validate.
Inline comments:
In `@scripts/runtime-seed-canary.py`:
- Around line 91-93: Update preflight() so the validated result from
canary_key() is preserved after the loop: use a distinct loop-variable name and
ensure both fetch_cache() and the GITHUB_OUTPUT write use the validated canary
key. Add or update coverage for the successful cache lookup and exported key if
tests for preflight() are present.
After applying the fix, consider running `coderabbit review --agent` for local
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.agents/skills/manage-ci/references/current-inventory.md.cargo/config.toml.github/workflows/cache-warm-sccache.yml.github/workflows/ci-linux-host-slice.yml.github/workflows/ci-linux-runtime-slice.yml.github/workflows/ci-quality-slice.yml.github/workflows/ci-rust-tests-slice.yml.github/workflows/depot-canary.yml.github/workflows/release.yml.github/workflows/sdk-smoke.ymlci/ci.mdci/runner-images.jsonscripts/bootstrap-build-tools.ps1scripts/cargo-linkerscripts/cargo-linker-linux-aarch64scripts/cargo-linker-linux-x86_64scripts/cargo-linker.cmdscripts/lib/lld.shscripts/runtime-seed-canary.pyscripts/tests/test_build_accelerator_defaults.pyscripts/tests/test_ci_artifact_actions.pyscripts/tests/test_ci_native_toolchain_routing.pyscripts/tests/test_lld_lib.pyscripts/tests/test_runner_image_identity.pyscripts/tests/test_runtime_seed_canary.pyscripts/tests/test_sccache_evidence.py
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- .cargo/config.toml
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- scripts/cargo-linker.cmd
- ci/ci.md
- ci/runner-images.json
- .agents/skills/manage-ci/references/current-inventory.md
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# Problem PR #1872 moved the protected planner's four Linux runtime rows to the promoted runner cohort, while `ci/runner-images.json` and the remaining workflow bindings still described the previous cohort. That transitional split makes repository identity checks fail on `main`. Separately, the protected Quality workflow did not provision sccache before Cargo invocations, which blocks PR #1870 once the repository-level `rustc-wrapper` becomes mandatory. # Result This prerequisite completes the promoted-image transition before #1870: - admits the promoted nine-image cohort with its retained promotion receipt; - updates all 36 registered workflow bindings and their toolchain epochs; - gives crates.io publish and resume jobs the registered CPU container and local sccache policy; - rotates compiler-seed identity for the new CPU image and prevents branch cache shadowing; - provisions sccache in both protected Quality jobs; - updates the matching catalog, release, cache, and artifact contracts. The linker defaults and Windows short-path build behavior remain in #1870. After this lands, #1870 can rebase onto a consistent protected planner/catalog base. # Validation On exact head `b453d87f289ba71631a33e42f67162dcae5a4f01`: - `just ci-validate`: passed, including 1,474 tests with 9 skipped; - runner image identity: 9 images, 35 roles, 36 workflow bindings, 4 runtime rows, 6 seed consumers; - actionlint and `git diff --check`: passed; - release targets, crate-list consistency, console-print policy, and publish-chain consistency: passed. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Chores** * Updated build, test, and release workflows to newer verified runner images. * Refreshed cache keys and expanded caching configuration across CI and release workflows. * Added provenance and receipt details for runner images. * Added dedicated release publishing environments with safer cache settings and checkout validation. * Restricted runtime seed canary execution to the main branch. * **Tests** * Expanded validation for runner image provenance, cache identity, release workflows, and canary behavior. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: scama <a1860575018c4680d5669dd7bc3bd356b478bccb8d42e194df46304a5e25f49a@meshllm.communities.buzz.xyz>
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The repository had accelerator policy split across entrypoint scripts and workflows, so plain Cargo builds could bypass sccache/linker setup and Windows ROCm still carried a stale cache opt-out after its build path was shortened.
This change makes the policy repository-wide:
CMAKE_OBJECT_PATH_MAX=180for every native backend;The managed runner transition and mold-enabled Linux images landed first in Mesh-LLM/mesh-llm-runner-images#24 and #1873. This PR is rebased directly onto that prerequisite.
Issue: buzz://issue?id=b09d2d83fac57d3b78e68083dd9f657ff85e1dcf8ab7f6002cad31ea405356fe&owner=a1860575018c4680d5669dd7bc3bd356b478bccb8d42e194df46304a5e25f49a&d=mesh-llm
Validation at
762ac2f74ef47031186ab10c78b4699e6893c0ed:just ci-validate: 1,487 passed, 9 skippedgit diff --checkskippy-modelpackage