feat(buck2): build otel-scrape natively - #1059
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Report historyPR 1059 · 2026-08-11 23:22 UTC
PR 1059 · 2026-08-11 23:12 UTC
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CI Measurementspartial - advisory gate - readiness
devenv / genie
devenv / quality gates
Unchanged / 0-impact measurements (6)These rows had compatible baseline data, but their semantic impact rounded to 0.00x because the movement was below the configured budget, below the noise floor, or inside the robust noise band. devenv / devenv cli
devenv / devenv shell
devenv / genie
devenv / quality gates
devenv / workspace setup
Diagnostic / ungated measurements (25)devenv / devenv shell
nix / closures / packages
source / effect-utils
All measurements
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schickling
marked this pull request as ready for review
August 11, 2026 23:34
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| "descriptor": [DefaultInfo(default_output = descriptor)], | ||
| }, | ||
| ), | ||
| RunInfo(args = cmd_args([binary])), |
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Remove this RunInfo because it makes buck2 run //packages/@overeng/otel-scrape:otel-scrape-artifact execute the normalized binary directly, even though packaging has replaced its interpreter with /lib64/ld-linux-x86-64.so.2 and removed its RPATH. On standard NixOS hosts that loader is absent, so the advertised runnable target fails before Nix can perform the required relocation; only the original binary target should be runnable, while this target should require import.
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| allowedReferences = [ ]; | ||
| ] | ||
| ++ lib.optionals relocateElf [ pkgs.patchelf ]; | ||
| allowedReferences = lib.optionals relocateElf runtimeLibraries; |
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Include the store object containing runtimeInterpreter in the allowed references, or reject configurations where it is not covered by runtimeLibraries. If a caller overrides runtimeInterpreter with a pinned loader from a different libc while retaining the default libraries, patchelf writes that store path into every ELF but allowedReferences permits only runtimeLibraries, so Nix rejects the otherwise valid import as an undeclared reference.
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Warning
STALE PROTOTYPE / SALVAGE SURFACE. This PR is based on stale #1057 and predates the selected shared Cargo workspace and strict product/runtime contract. The glibc artifact requires glibc 2.39; fleet portability, genuine current-contract import, and independent reproducibility remain unproved. Useful Rust work will be replayed through #1062 and #1063.
Problem
otel-scrapestill used Cargo/Nix as the repo-local build granularity, preventing Buck2 from reusing individual Rust compilation and link actions. The Nix bridge also needed an explicit producer/consumer runtime ABI contract before native ELF artifacts could be imported safely.Goal
Build, test, package, observe, benchmark, and import
otel-scrapethrough a native fine-grained Buck2 graph while retaining Nix/devenv as the toolchain, environment, and system integration authority. This is PR 3 of the stack after #1056 and #1057.Decisions
glibc-dynamicruntime ABI.runtimeAbiand every importer call to stateexpectedRuntimeAbi; omissions and mismatches fail closed.runtimeAbi = portable; dynamic native binaries may only cross through the relocation/runtime-closure importer.Verification
Exact head:
26b849a72a6b631d9ac08c3a9d32164bf36d46c6CI=1 devenv tasks run check:all --no-tui(green, 62s)otel-scrape,megarepo, and portable package evidenceabe3908e-1703-4cf7-9c73-452340797545): warm p50 16.041ms; mtime p50 17.846ms; irrelevant edit p50 19.041ms; relevant edit p50 1574.471ms with exactly 2 actionsComplexity
The majority of the diff is deterministic Reindeer output: a local sparse index, generated BUCK targets, fixups, and 32 locked crate archives. Handwritten complexity is concentrated in the Nix-backed Rust/C++ toolchains, the native artifact rule, ABI-aware importer contract, invalidation harness, and devenv task wiring.
Concerns
glibc-dynamicartifacts are intentionally not directly runnable after normalization; Nix owns final interpreter/RPATH relocation and runtime closure.Friction & bottlenecks
Follow-ups
References