reqbench: bind the golden to the image the build phase produced - #864
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make bench-chromium-request-golden runs cmd_build and cmd_golden as separate reqbench.sh processes with the TAG lock released between them. The checks inside cmd_golden (disk cache key, prepared generation) only prove that golden's own observation is self-consistent, so a tag repointed in that window was snapshotted silently, with provenance stamped from the swap. cmd_build now records the image ID it published (normalized sha256:<64hex>, atomic mktemp+mv) in $DATA_ROOT/reqbench-locks/built-image-<image>.id, and cmd_golden, right after its atomic inspect, refuses a tag whose ID differs from that record, naming both IDs. The record (or null when no build preceded the golden) is committed into reqbench-provenance.json as built_image_id. The tag, not the ID, is still what prepare receives: the existing disk-key and prepared-generation checks close the windows inside cmd_golden. cmd_build also refuses to build when render.py, cdpdrive.py or wddrive.py in the live repository differ from the sealed runtime bundle: the image COPYs render.py from the repository while the cdp arm runs the bundle copy, and the staging guard compares git HEAD only, which cannot see an uncommitted edit, so the two arms could run different render code under a passing seal. Fixes #813. Tests (bench/chromium, stub-podman harness, no VM): four new tests, each watched failing on the unfixed tree first: - test_build_records_the_image_id_it_published: AssertionError: '<missing>' != 'sha256:bbb...b' - test_golden_refuses_an_image_that_is_not_the_one_build_produced: AssertionError: 0 == 0 (golden exited 0 despite a mismatched record) - test_golden_records_a_matching_build_id_in_provenance: KeyError: 'built_image_id' - test_build_refuses_a_render_py_that_diverged_from_the_sealed_bundle: 'render.py' not found in stderr, and the podman build marker existed All four pass with the fix. Full suite: python3 -m unittest test_reqbench, 189 tests, failures=18 errors=4, failure names identical to the clean-main baseline run (185 tests, failures=18 errors=4; environment-bound teardown classes, no KVM on this box).
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📝 WalkthroughWalkthroughThe benchmark build now seals source files, records the exact produced image ID, validates that ID during golden generation, and stores it in snapshot provenance. Regression tests cover source divergence, mid-build mutation, tag replacement, and image identity. Changesreqbench image binding
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The change binds golden runs to a built image, but colliding record names and stale records can reject valid images or attach incorrect build provenance. The PR is not merge-ready until record identity and transaction scoping are fixed. Possibly related PRs
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…ed context cmd_build read the image ID with podman image inspect after podman build returned, so a retag of $IMAGE in that window recorded the replacement's ID and the build-to-golden handshake then blessed the replacement. The build now passes --iidfile, which makes podman record the ID of the image this build produced as part of the build operation itself; the recorded value is normalized to sha256:<64hex> and validated, and the HEALTHCHECK assertion inspects that ID instead of the retaggable tag. cmd_build also compared the sealed sources against the live repository and then handed podman that same mutable repository as the build context, so an edit landing between the cmp and podman's COPY still baked diverged bytes while the cdp arm ran the sealed copy. The build now stages an immutable context (bench/chromium top-level files plus pages/, cp --reflink=auto, bench/chromium/ relative paths preserved, Containerfile included) and overwrites render.py, cdpdrive.py and wddrive.py from the runtime bundle. The cmp stays as a fail-fast pre-check. Red watched failing before the fix (stub-podman harness, no VM): - test_build_records_the_id_of_the_image_it_built_not_the_tags: AssertionError: 'sha256:fff...' != 'sha256:aaa...' (the handshake recorded the ID the retagged tag resolved to, not the built image's). - test_build_bakes_the_sealed_bytes_when_the_repo_mutates_mid_build: the recorded context bytes ended in '# edit landed while podman was reading the context', appended by the stub after every pre-check passed. Both pass with the fix. The existing build-records test's podman stub now honors --iidfile and drops its image-inspect branch, so a regression back to inspecting the tag after the build fails instead of passing silently. Full suite: python3 -m unittest test_reqbench, 191 tests, failures=18 errors=4, failure names diffed identical to the clean-branch baseline (environment-bound teardown classes).
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Actionable comments posted: 2
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Inline comments:
In `@bench/chromium/reqbench.sh`:
- Around line 462-465: Update built_image_id_file in reqbench.sh and
_built_id_path in test_reqbench.py to derive the record filename from a
collision-free hash of the complete IMAGE value instead of replacing “/” and “:”
characters, ensuring both implementations use the identical encoding.
- Around line 576-586: Scope the built-image record to a single build-to-golden
transaction by passing an explicit shared transaction identifier through the
build-and-golden orchestration and keying or atomically consuming the record
with it. Update the built_image_id_file flow and its callers so a golden without
the matching preceding build cannot reuse stale data, while preserving
validation and mismatch checks for the current transaction. Add coverage for
golden running after an older completed build.
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Two review findings on the build-to-golden handshake: - tr '/:' '__' is not injective, so localhost/a_b:c and localhost/a:b_c shared one record file and could clobber each other. The filename now keys on sha256 of the full image name; test_build_record_paths_do_not_collide_across_image_names was red on the substitution (both the collision and a shell/python path disagreement) and also pins byte-for-byte agreement between built_image_id_file and the test helper by sourcing the real script. - The record had no transaction identity and outlived its golden, so a later golden with no build of its own inherited it, attesting a stale built_image_id or rejecting a legitimately retagged image. golden now claims the record with an atomic rename and removes it after reading; test_golden_consumes_the_build_record was red on the persisting file. Tested: both tests watched failing with the pre-fix reqbench.sh stashed (the tests and hashed helper in place), green after; the build/golden test subset is OK and the full test_reqbench failure set is the same 22 environment-bound names as the baseline.
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NOT-A-DEFECT: the review bodies are summaries and reviewer auto-replies; both inline findings are dispositioned in their threads, RED-VERIFIED in d1e2c4a: the image ID is captured by podman build --iidfile as part of the build itself, and the image is built from an immutable staged context whose sealed sources come from the runtime bundle.
1 participant
make bench-chromium-request-golden runs cmd_build and cmd_golden as separate
reqbench.sh processes with the TAG lock released between them. The checks
inside cmd_golden (disk cache key, prepared generation) only prove that
golden's own observation is self-consistent, so a tag repointed in that
window was snapshotted silently, with provenance stamped from the swap.
cmd_build now records the image ID it published (normalized sha256:<64hex>,![]()
.id, and
atomic mktemp+mv) in $DATA_ROOT/reqbench-locks/built-image-
cmd_golden, right after its atomic inspect, refuses a tag whose ID differs
from that record, naming both IDs. The record (or null when no build
preceded the golden) is committed into reqbench-provenance.json as
built_image_id. The tag, not the ID, is still what prepare receives: the
existing disk-key and prepared-generation checks close the windows inside
cmd_golden.
cmd_build also refuses to build when render.py, cdpdrive.py or wddrive.py in
the live repository differ from the sealed runtime bundle: the image COPYs
render.py from the repository while the cdp arm runs the bundle copy, and
the staging guard compares git HEAD only, which cannot see an uncommitted
edit, so the two arms could run different render code under a passing seal.
Fixes #813.
Tests (bench/chromium, stub-podman harness, no VM): four new tests, each
watched failing on the unfixed tree first:
AssertionError: '' != 'sha256:bbb...b'
AssertionError: 0 == 0 (golden exited 0 despite a mismatched record)
KeyError: 'built_image_id'
'render.py' not found in stderr, and the podman build marker existed
All four pass with the fix. Full suite: python3 -m unittest test_reqbench,
189 tests, failures=18 errors=4, failure names identical to the clean-main
baseline run (185 tests, failures=18 errors=4; environment-bound teardown
classes, no KVM on this box).
Summary by CodeRabbit
Bug Fixes
Tests