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id(roc): pin and rebuild checked-in example modules (#541) - #3883
Added pkgs/id/nix/roc-version as the single Roc version source; nix/roc.nix derives its release tag from it.
All seven example build.sh scripts source a shared guard and refuse a compiler whose roc version does not match the pin. The selected compiler is also passed through to the shared host build.
Rebuilt the checked-in example modules with nightly-2026-10-04-130536d.
Added a roc-examples Nix check that rebuilds all seven modules with the pinned compiler, then runs the complete sandbox test module and the pin tests. It verifies behavior and fuel budgets, not Wasm hashes; the check is included in the id CI matrix.
Added pin-drift and wrong-compiler refusal tests. Fixed the wasm-opt Nix fallback to invoke wasm-opt from the binaryen shell.
Rebuilt all seven examples in the Nix dev shell and ran wasm-tools validate on every module.
shellcheck, shfmt, nixfmt, the PR-check-list guard, and just-recipe drift check passed.
Existing main-branch test issue
The broader all-features test-unit currently fails to compile on main because world_ssh.rs:305 still implements the old russhauth_publickey parameter, while the current dependency expects VerifiedPublicKey<'_>. The new check excludes optional SSH and runs the requested sandbox/world behavior tests. A separate full no-SSH library run also hit the existing bulk-sync timeout test (log_sync::tests::test_a_bulk_session_moves_every_event_across_pages); the dedicated sandbox suite and fuel tests pass.
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Commits
Reviewing files that changed from the base of the PR and between facde68 and 10bcbd1.
Files ignored due to path filters: 3
pkgs/id/examples/roc-grid/roc-grid.wasm is excluded by !**/*.wasm
pkgs/id/examples/roc-screen/roc-screen.wasm is excluded by !**/*.wasm
pkgs/id/examples/territory/territory.wasm is excluded by !**/*.wasm
Files selected for processing: 14
.github/scripts/id-pr-checks.txt
pkgs/id/apps/tic-tac-toe/program/build.sh
pkgs/id/examples/lounge/build.sh
pkgs/id/examples/roc-chat/build.sh
pkgs/id/examples/roc-counter/build.sh
pkgs/id/examples/roc-grid/build.sh
pkgs/id/examples/roc-screen/build.sh
pkgs/id/examples/roc-toolchain.sh
pkgs/id/examples/territory/build.sh
pkgs/id/flake.nix
pkgs/id/nix/roc-version
pkgs/id/nix/roc.nix
pkgs/id/scripts/rebuild-roc-examples.sh
pkgs/id/tests/toolchain_pin.rs
Walkthrough
The changes pin the Roc compiler version, check that example builds use the pinned compiler, and add a CI check that rebuilds seven examples and runs sandbox and toolchain-pin tests.
Changes: Roc example toolchain and CI
Layer / File(s)
Summary
Define and enforce the compiler pin pkgs/id/nix/roc-version, pkgs/id/nix/roc.nix, pkgs/id/examples/roc-toolchain.sh, pkgs/id/tests/toolchain_pin.rs
The compiler download tag comes from roc-version. The shared shell guard checks the selected compiler version. Tests check the pin and verify that a mismatched compiler stops the build.
Apply the pin to example builds pkgs/id/examples/*/build.sh
The seven example build scripts export ROC and source the shared guard. Their Binaryen fallback uses nix shell to run wasm-opt.
Rebuild examples in CI pkgs/id/flake.nix, pkgs/id/scripts/rebuild-roc-examples.sh, .github/scripts/id-pr-checks.txt
A new Nix check rebuilds the examples, then runs sandbox and toolchain-pin tests. The check is added to the CI-safe and fast PR check lists.
sequenceDiagram
participant NixCheck as roc-examples check
participant Rebuild as rebuild-roc-examples.sh
participant BuildScripts as example build scripts
participant SandboxTests as sandbox library tests
participant PinTests as toolchain_pin test
NixCheck->>Rebuild: rebuild examples
Rebuild->>BuildScripts: run each build.sh
NixCheck->>SandboxTests: run tests
NixCheck->>PinTests: run toolchain pin checks
Loading
Merge Risk: Low · previous review facde
The change is mergeable with a small follow-up: make the rebuild script independent of the working directory so developers can run it from the repository root.
Pre-merge checks: 3 · 1 · 1
Failed checks: 1 warning · 1 inconclusive
Check name
Status
Explanation
Resolution
Docstring Coverage
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Linked Issues check
Scope: directly linked issue #541 (open). Its coding requirements are three acceptance criteria. No parent or contextual issues apply.
1. [#541] Every example is rebuilt with the nix/roc.nix compiler…
Provide reviewable evidence that the checked-in roc-grid, roc-screen, and territory outputs were regenerated by the pinned rebuild. Excluded .wasm contents cannot be inspected under the !**/*.wasm rule. Acceptable evidence includes CI or …
Passed checks: 3 passed
Check name
Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title clearly summarizes the main changes: pinning the Roc compiler and rebuilding the checked-in example modules.
Out of Scope Changes check
Changed areas and their link to #541: - pkgs/id/nix/roc-version and pkgs/id/nix/roc.nix: single pin source. Required by criterion 1. - pkgs/id/examples/roc-toolchain.sh and the seven example build.sh …
Full details: Out of Scope Changes check
Explanation
Changed areas and their link to #541:
pkgs/id/nix/roc-version and pkgs/id/nix/roc.nix: single pin source. Required by criterion 1.
pkgs/id/examples/roc-toolchain.sh and the seven example build.sh scripts: shared version guard, and passing the selected compiler to the host build. Required by criterion 2.
pkgs/id/examples/*/build.sh wasm-opt fallback changed to nix shell nixpkgs#binaryen --command wasm-opt: needed because the rebuild path runs wasm-opt. This is in the same scripts and the same rebuild path, so it is connected.
pkgs/id/scripts/rebuild-roc-examples.sh: rebuilds the seven examples in order. Required by criterion 1.
pkgs/id/flake.nix: adds the roc-examples check and mkCheckWith support. Required by criterion 3.
.github/scripts/id-pr-checks.txt: adds roc-examples to the fast check list. Required by criterion 3.
pkgs/id/tests/toolchain_pin.rs: pin-drift and wrong-compiler refusal tests. Supports criteria 1 and 2.
No change was found that lacks a connection to #541. The ignored .wasm files are rebuilt outputs, not separate scope changes. The roc.nix hashes are unchanged.
Full details: Docstring Coverage
Explanation
Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 10 files. (4 skipped: 4 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
Full details: Linked Issues check
Explanation
Scope: directly linked issue #541 (open). Its coding requirements are three acceptance criteria. No parent or contextual issues apply.
[#541] Every example is rebuilt with the nix/roc.nix compiler. Partly supported. pkgs/id/nix/roc-version pins nightly-2026-10-04-130536d. roc.nix derives its release tag from that file. The seven build.sh scripts source roc-toolchain.sh, and rebuild-roc-examples.sh rebuilds all seven. The roc-examples check in flake.nix rebuilds the modules with the pinned compiler. The author reports the rebuild passed. The rebuilt outputs are the checked-in .wasm files. Three of them are excluded by ignored_files rule !**/*.wasm: pkgs/id/examples/roc-grid/roc-grid.wasm, pkgs/id/examples/roc-screen/roc-screen.wasm, and pkgs/id/examples/territory/territory.wasm. Their regenerated content cannot be inspected. Only the author report and the reviewable build code support that these artifacts were rebuilt with the pin.
[#541] Each build.sh refuses other compiler versions. Supported. roc-toolchain.sh runs ${ROC:-roc} version, exits with status 1 on command failure, and exits with status 1 when the output does not exactly match the pin. All seven build.sh scripts source it. toolchain_pin.rs checks the sourcing in each example. A stub-compiler test checks that territory build.sh refuses an unpinned compiler and does not run the build command. Refusal is tested directly for territory only. The other six rely on the shared guard.
[#541] A CI job rebuilds the examples and checks behaviour (sandbox suite and fuel budgets), not hashes. Supported. The roc-examples check in flake.nix rebuilds the modules, then runs the sandbox library tests and the toolchain_pin test. The author reports the check passed with 2,088 library tests, 8 toolchain-pin tests, and the fuel-budget test. The check is added to .github/scripts/id-pr-checks.txt. The summary does not show the CI workflow that consumes this list.
Unresolved: whether the three excluded .wasm artifacts were regenerated with the pinned compiler. Criterion 1 depends on them.
Resolution
Provide reviewable evidence that the checked-in roc-grid, roc-screen, and territory outputs were regenerated by the pinned rebuild. Excluded .wasm contents cannot be inspected under the !**/*.wasm rule. Acceptable evidence includes CI or check output from roc-examples that records the rebuilt outputs, or a reviewable non-ignored record of the rebuild. Also confirm that the id CI workflow runs the roc-examples check from the id-pr-checks.txt list.
Finishing Touches
Generate docstrings
Commit to this branch
Create a new PR
Generate unit tests (beta)
Commit to this branch
Create a new PR
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Reviewing files that changed from the base of the PR and between 5b2eca7 and facde68.
Files ignored due to path filters: 3
pkgs/id/examples/roc-grid/roc-grid.wasm is excluded by !**/*.wasm
pkgs/id/examples/roc-screen/roc-screen.wasm is excluded by !**/*.wasm
pkgs/id/examples/territory/territory.wasm is excluded by !**/*.wasm
Files selected for processing: 14
.github/scripts/id-pr-checks.txt
pkgs/id/examples/lounge/build.sh
pkgs/id/examples/roc-chat/build.sh
pkgs/id/examples/roc-counter/build.sh
pkgs/id/examples/roc-grid/build.sh
pkgs/id/examples/roc-screen/build.sh
pkgs/id/examples/roc-toolchain.sh
pkgs/id/examples/territory/build.sh
pkgs/id/examples/tic-tac-toe/build.sh
pkgs/id/flake.nix
pkgs/id/nix/roc-version
pkgs/id/nix/roc.nix
pkgs/id/scripts/rebuild-roc-examples.sh
pkgs/id/tests/toolchain_pin.rs
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @pkgs/id/scripts/rebuild-roc-examples.sh:
- Line 8: Update the example-building flow in rebuild-roc-examples.sh to resolve
its working directory from the script’s location before using the examples
array, so the `examples/$example` paths work regardless of the caller’s
directory.
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Reviewing files that changed from the base of the PR and between 5b2eca7 and facde68.
Files ignored due to path filters: 3
pkgs/id/examples/roc-grid/roc-grid.wasm is excluded by !**/*.wasm
pkgs/id/examples/roc-screen/roc-screen.wasm is excluded by !**/*.wasm
pkgs/id/examples/territory/territory.wasm is excluded by !**/*.wasm
Files selected for processing: 14
.github/scripts/id-pr-checks.txt
pkgs/id/examples/lounge/build.sh
pkgs/id/examples/roc-chat/build.sh
pkgs/id/examples/roc-counter/build.sh
pkgs/id/examples/roc-grid/build.sh
pkgs/id/examples/roc-screen/build.sh
pkgs/id/examples/roc-toolchain.sh
pkgs/id/examples/territory/build.sh
pkgs/id/examples/tic-tac-toe/build.sh
pkgs/id/flake.nix
pkgs/id/nix/roc-version
pkgs/id/nix/roc.nix
pkgs/id/scripts/rebuild-roc-examples.sh
pkgs/id/tests/toolchain_pin.rs
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Main relocated the example to apps/tic-tac-toe/program; point the
rebuild list, toolchain guard source path, and pin-drift test at the
new location so the check still covers all 7 modules.
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Make nested host builds executable in the Nix sandbox
With Nix sandboxing enabled on Linux, this rebuild reaches examples/lounge/build.sh:32, which executes ../roc-world/build-host.sh directly. That script uses #!/usr/bin/env bash, but /usr/bin/env is absent in the sandbox—the existing workaround in nix-common.nix:32–36 explicitly invokes the same script with Bash for this reason. Invoking the outer rebuild script with Bash does not fix the nested invocation, and this check does not patch its shebang before building. Consequently, the new PR-matrix check fails on the first example before reaching the tests. Invoke the nested host builds with Bash or patch their shebangs before rebuilding.
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Closes #541
What changed
pkgs/id/nix/roc-versionas the single Roc version source;nix/roc.nixderives its release tag from it.build.shscripts source a shared guard and refuse a compiler whoseroc versiondoes not match the pin. The selected compiler is also passed through to the shared host build.nightly-2026-10-04-130536d.roc-examplesNix check that rebuilds all seven modules with the pinned compiler, then runs the complete sandbox test module and the pin tests. It verifies behavior and fuel budgets, not Wasm hashes; the check is included in the id CI matrix.wasm-optNix fallback to invokewasm-optfrom thebinaryenshell.Verification
nix build -L --no-link ./pkgs/id#checks.x86_64-linux.roc-examples— passed: 30 sandbox tests passed, 2 ignored; all 8 toolchain-pin tests passed.wasm-tools validateon every module.shellcheck,shfmt,nixfmt, the PR-check-list guard, and just-recipe drift check passed.Existing main-branch test issue
The broader all-features
test-unitcurrently fails to compile on main becauseworld_ssh.rs:305still implements the oldrusshauth_publickeyparameter, while the current dependency expectsVerifiedPublicKey<'_>. The new check excludes optional SSH and runs the requested sandbox/world behavior tests. A separate full no-SSH library run also hit the existing bulk-sync timeout test (log_sync::tests::test_a_bulk_session_moves_every_event_across_pages); the dedicated sandbox suite and fuel tests pass.