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feat(rust-ci-reusable): real owned coverage gate (llvm-cov + ratcheted floor) #470

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Merged
hyperpolymath merged 1 commit into from
Jul 6, 2026
Merged

feat(rust-ci-reusable): real owned coverage gate (llvm-cov + ratcheted floor) #470

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41 changes: 30 additions & 11 deletions .github/workflows/rust-ci-reusable.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -65,10 +65,15 @@ on:
required: false
default: false
enable_coverage:
description: Run `cargo tarpaulin` + upload to codecov (slow; off by default)
description: Measure line coverage with cargo-llvm-cov and enforce `coverage_floor` (off by default)
type: boolean
required: false
default: false
coverage_floor:
description: Minimum line-coverage percent when enable_coverage is set; ratchet upward, never lower.
type: string
required: false
default: "0"
clippy_args:
description: Args appended to `cargo clippy`
type: string
Expand Down Expand Up @@ -254,8 +259,8 @@ jobs:
run: cargo audit

coverage:
timeout-minutes: 20
name: Coverage (tarpaulin + codecov)
timeout-minutes: 25
name: llvm-cov line coverage
runs-on: ${{ inputs.runs-on }}
needs: detect
if: ${{ inputs.enable_coverage && needs.detect.outputs.has_cargo == 'true' }}
Expand All @@ -264,6 +269,9 @@ jobs:
defaults:
run:
working-directory: ${{ inputs.working_directory }}
env:
# Ratcheted line-coverage floor (from the caller). Raise toward target; never lower.
FLOOR: ${{ inputs.coverage_floor }}
steps:
- name: Checkout repository
uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
Expand All @@ -276,14 +284,25 @@ jobs:
uses: dtolnay/rust-toolchain@67ef31d5b988238dd797d409d6f9574278e20537 # stable
with:
toolchain: stable
components: llvm-tools-preview

- name: Install tarpaulin
run: cargo install cargo-tarpaulin --locked
- name: Install cargo-llvm-cov
run: cargo install cargo-llvm-cov --locked

- name: Generate coverage
run: cargo tarpaulin --out Xml
- name: Measure line coverage
id: cov
# Self-contained: no external coverage service. Own the gate on our runner.
run: |
set -euo pipefail
cargo llvm-cov --workspace --locked --json --output-path cov.json
PCT=$(jq -r '.data[0].totals.lines.percent' cov.json)
printf '### Line coverage: %.2f%% (floor %s%%)\n' "$PCT" "$FLOOR" >> "$GITHUB_STEP_SUMMARY"
echo "pct=$PCT" >> "$GITHUB_OUTPUT"

- name: Upload to codecov
uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
with:
files: cobertura.xml
- name: Enforce ratchet floor
run: |
set -euo pipefail
awk -v p="${{ steps.cov.outputs.pct }}" -v f="$FLOOR" 'BEGIN {
if (p + 0 < f + 0) { printf "FAIL: line coverage %.2f%% is below floor %s%%\n", p, f; exit 1 }
printf "OK: line coverage %.2f%% >= floor %s%%\n", p, f
}'
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