fix(ext-fetch): let the crate's own test binary link, restoring the ext-link gate - #8197
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perry-runtime is built here with external-fetch-symbols, which is right for every shipped configuration: it declares js_blob_new, js_file_new, js_headers_init_from_value and js_fetch_notify_signal_aborted extern and CALLS them, on the promise that the final link provides them. In a real binary perry-stdlib does. This crate's test binary links perry-runtime and nothing else, so those four calls had no definition and `cargo test --no-run` failed to link. The cost was not one crate: ext-link is the only gate covering perry-ext-*, because cargo-test's scope deliberately keeps that family out of its fan-out (#7656). While it was red on every PR the whole family had no gate — and perry-ext-fetch's own 13 tests had never run, since the binary could not be produced. Define the four in a #[cfg(test)] module. Not as real implementations: this crate is a staticlib whose objects win the final link ahead of perry-stdlib (prefer_well_known_before_stdlib), so shipping them would silently replace perry-stdlib's Blob/File/Headers constructors and abort bridge everywhere — a behaviour change smuggled in under a CI fix. The crate implements 39 fetch symbols; these four are deliberately not among them. cfg(test) never reaches libperry_ext_fetch.a, and perry-stdlib is absent from the test link, so no duplicate symbol can arise. Semantics match the runtime's own stdlib_stubs: warn once, return undefined. A guard test asserts no non-cfg(test) file in this crate defines any of the four, so a later move out from behind cfg(test) fails here rather than silently overriding stdlib at link time. Sabotage-verified. Not changed, deliberately: stdlib_stubs.rs has no js_file_new or js_fetch_notify_signal_aborted stub, which reads like a gap but is not. Both call sites are cfg'd on external-fetch-symbols; the non-external arms use the GLOBAL_FETCH_* function-pointer registry and a no-op respectively, so nothing references them in the stub configuration.
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Included review availability: Your plan includes up to 8 reviews per rolling hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe fetch extension adds test-only linker stubs for four ChangesFetch test linking
Estimated code review effort: 2 (Simple) | ~15 minutes Merge Risk: ⚪ Minimal · up to The PR adds test-only linker stubs so the crate's test binary can build and run without changing shipped behavior; no actionable merge-blocking risk remains after normal checks and review. Possibly related PRs
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Inline comments:
In `@crates/perry-ext-fetch/src/test_link_stubs.rs`:
- Around line 97-104: Update the test in test_link_stubs to read lib.rs and
assert that the test_link_stubs module declaration is gated with #[cfg(test)],
rather than checking for the annotation inside test_link_stubs.rs. Preserve the
failure message and ensure the assertion detects removal of the lib.rs gate.
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changelog.d/8197-ext-fetch-test-link.mdcrates/perry-ext-fetch/src/lib.rscrates/perry-ext-fetch/src/test_link_stubs.rs
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Note on this PR's |
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Verified locally by running the gate's own commands, rather than reading CI:
The whole gate scope builds and links on this branch. The guard test is sabotage-verified: defining The |
CodeRabbit caught this and is right: the guard scanned test_link_stubs.rs for `#[cfg(test)]` and found the annotation on the inner `mod tests`, so deleting the gate in lib.rs — the one thing keeping these four symbols out of libperry_ext_fetch.a — left the assertion passing. It was checking a string in the file it lives in rather than the fact it claims to protect. Read lib.rs and assert `mod test_link_stubs;` is immediately preceded by `#[cfg(test)]`. Sabotage-verified in the direction that matters: removing the gate now fails with the reason, where before it passed.
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Good catch, fixed in The guard scanned It now reads where the previous version passed. |
1 participant
Closes #8155.
The failure
cargo test --no-run -p perry-ext-fetchcannot link:perry-runtimeis built here withexternal-fetch-symbols, which is correct for every shipped configuration: it declares those fourexternand calls them, on the promise that the final link provides them. In a real binaryperry-stdlibdoes (fetch_blob.rs,fetch/abort_bridge.rs). This crate's test binary linksperry-runtimeand nothing else.The cost was not one crate.
ext-linkis the only gate coveringperry-ext-*, becausecargo-test's scope deliberately keeps that family out of its fan-out (#7656). While it was red on every PR, the whole family was ungated — andperry-ext-fetch's own 13 tests had never run, because the binary could not be produced. They pass.The fix, and what it deliberately is not
Four definitions in a
#[cfg(test)]module.Not real implementations. This crate is a
staticlibwhose objects win the final link ahead of perry-stdlib (prefer_well_known_before_stdlib), so defining them for real would replace perry-stdlib's Blob/File/Headers constructors and abort bridge in every shipped binary — a behaviour change smuggled in under a CI fix, and one that would have to reimplementFETCH_ABORT_WATCHERSand the blob registry to be equivalent. This crate implements 39 fetch symbols; these four are deliberately not among them.#[cfg(test)]never reacheslibperry_ext_fetch.a, and perry-stdlib is absent from the test link, so no duplicate symbol can arise. Semantics match the runtime's ownstdlib_stubs.rs: warn once, returnundefined.Also not the dev-dependency route, which #8155's analysis had already tried and rejected: adding
perry-stdlibplusextern crateto force its objects in does make the link succeed, but producesduplicate symboldiagnostics that macOSlddowngrades to warnings — link-order-dependent binding in a test binary, which is precisely the failure shape of #8156.A guard test asserts that no non-
cfg(test)file in this crate defines any of the four, so a later move out from behindcfg(test)fails here rather than silently overriding stdlib at link time. Sabotage-verified: definingjs_blob_newin a shipped module fails it with the offending path named.One thing in the issue's analysis that is a false premise
The issue notes that
stdlib_stubs.rshas nojs_file_newstub (norjs_fetch_notify_signal_aborted) and reads that as an independent gap. It isn't: both call sites arecfg'd onexternal-fetch-symbols, and the non-external arms use theGLOBAL_FETCH_*function-pointer registry and a no-op respectively. Nothing references them in the stub configuration, so no stub is owed. Recorded so nobody "fixes" it.Relationship to #8187
#8187 makes
ext-linkopt-in on PRs (labelrun-extended-tests) and adds nightly/tag arms, citing this issue as the reason. That stops the noise; it does not make the link work, so the nightly arm would still have been red. The two are complementary — this PR touches only Rust and no workflow file, so they cannot conflict.Validation
cargo test --release --no-run -p perry-ext-fetch— the gate's exact command — links.cargo check --release -p perry-ext-fetch(the gate's per-package feature-graph step) clean.cargo test -p perry-ext-fetch: 13 passed, up from a crate that could not build a test binary.cargo fmt --check,check_file_size.shclean; no new clippy warnings (the 4 on this crate are pre-existing).No version bump.
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