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# FJ-2607: Infrastructure mutation testing
# Runs mutation tests to verify detection coverage
name: mutation
on:
push:
branches:
paths:
- "src/**"
- "mutants.toml"
- ".cargo/config.toml"
- ".github/workflows/mutation.yml"
pull_request:
paths:
- "src/**"
- "mutants.toml"
workflow_dispatch:
concurrency:
group: mutation-${{ github.ref }}
cancel-in-progress: true
jobs:
mutation:
# forjar#598 -- PINNED TO BARE METAL (interim, named coupling). This job
# runs UNFILTERED lib tests, which include nas_archive's
# the_environment_can_exercise_the_safety_property -- a test that FAILS
# rather than skips when rsync is absent (#289). rsync is absent from the
# yoga-build* containers that `[self-hosted, clean-room, X64]` also
# matches, so without `intel` this job is a per-run lottery. `intel` is a
# hostname standing in for a capability; remove it with the others when a
# capability label exists or yoga's images converge (paiml/infra#813).
runs-on:
# infra#430: sixteen clean-room runners share one ~/.cargo, and an hourly
# reaper deletes registry/src entries by mtime -- under a live build, which
# makes rustc read a source file that has just vanished:
# couldn't read .../registry/src/.../<crate>/src/<file>.rs: No such file
# error: could not parse/generate dep info at: .../deps/<crate>.d
# MEASURED on this branch: msrv and coverage both died that way the first
# time PMAT-547 moved them off GitHub-hosted runners, where each job had a
# private ~/.cargo by construction. A registry private to this runner takes
# the job off the shared surface. The path is outside the workspace, so it
# survives the checkout clean and is a cache rather than a cold download.
# The host-side fix is paiml/infra's.
env:
CARGO_HOME: ${{ github.workspace }}/../cargo-home-${{ github.job }}
timeout-minutes: 60
steps:
- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
- name: Install Rust
uses: dtolnay/rust-toolchain@stable
- uses: Swatinem/rust-cache@v2
- name: Install cargo-mutants
run: |
# forjar#566: a stale `rustup override set 1.89.0`, left in this
# runner's workspace by the MSRV job before that job stopped writing
# one, outranks rust-toolchain.toml; cargo-mutants 27.1.0 needs 1.91
# and failed to build under it. Clear it so the pin applies.
rustup override unset
rustc --version
cargo install cargo-mutants
- name: Run mutation tests
continue-on-error: true
run: cargo mutants --timeout 120
- name: Upload mutation report
if: always()
uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
with:
name: mutation-results
path: mutants.out/
retention-days: 14
if-no-files-found: ignore