feat(contracts): reproducible WASM builds with hash verification in CI - #1386
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Calebux merged 1 commit intoSep 1, 2026
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- Add contracts/rust-toolchain.toml pinning Rust 1.81.0 (required by
soroban-sdk v27) with wasm32-unknown-unknown target and minimal profile
- Rewrite .github/workflows/contracts.yml:
- Build with --locked on every cargo invocation (Cargo.lock is
authoritative)
- Double-build determinism check: build twice, wipe WASM output between
passes, fail if any sha256 differs
- Emit per-contract sha256 hashes to the GitHub Actions job summary as
a Markdown table
- Upload wasm-contracts-<sha> and wasm-hashes-<sha> artifacts (90-day
retention) on every contract PR and push to main
- Add publish-manifest job (tags only): generates and commits
contracts/build-manifest.json with version, commit, toolchain, and
per-contract sha256
- Fix two pre-existing shell bugs in the contract-size check step
- Add contracts/build-manifest.json placeholder (populated by CI on
tagged releases)
- Add contracts/scripts/build-reproducible.sh: single documented command
for guardians to reproduce hashes locally and compare against the
published manifest
Closes Calebux#1228
|
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Summary
Implements #1228 — guardians can now independently verify that deployed WASM matches source.
Changes
contracts/rust-toolchain.toml(new)Pins Rust
1.81.0withwasm32-unknown-unknowntarget. Required by soroban-sdk v27 (confirmed from Cargo.lock). Rustup picks this up automatically in any subdirectory ofcontracts/..github/workflows/contracts.yml(rewritten)cargo build/cargo testcalls now use--locked(Cargo.lock is authoritative)wasm-contracts-<sha>andwasm-hashes-<sha>artifacts (90-day retention)publish-manifestjob (tags only): generates and commitscontracts/build-manifest.jsoncontracts/build-manifest.json(new placeholder)Populated by CI on tagged releases. Maps each contract to sha256, commit, toolchain, and release tag.
contracts/scripts/build-reproducible.sh(new)Single documented command for guardians:
bash
bash contracts/scripts/build-reproducible.sh # current tree
bash contracts/scripts/build-reproducible.sh v1.2.3 # specific tag
Auto-compares produced hashes against
build-manifest.jsonwhenjqis available.Acceptance criteria
rust-toolchain.tomlpins the exact toolchain used for release buildsCloses #1228