ci.yml

# CI — the host-local gate on the supported OSes (macOS arm64 + Linux x86_64),
# mirroring the local gate. Each matrix leg runs `scripts/ci_gate.sh`, so CI
# verifies exactly what the maintainer runs per host (single source of truth).
#
# Triggers: pull_request (any target) + push to `main` + manual dispatch.
# The gate has no external runtime dependency beyond Zig 0.16.0 and python3
# (preinstalled on GitHub runners); `zig build -Dwasm` fetches the embedded
# zwasm engine + the zlinter dev-dep from git over the network.
#
# ONE configuration, everywhere (2026-08-12). PR, push, dispatch and the local
# `scripts/run_gate.sh` all run the identical full gate, so "green" means the
# same run wherever it was said. The tiers this used to have (PR → smoke,
# nightly → full + a tree_walk sweep) were the drift they were meant to catch:
# the last nightly failed on a wall-clock bound in a config nothing else ran,
# which is a finding about the runner, not about cljw.
# `scripts/check_gate_parity.sh` enforces the single configuration mechanically.
# The Zig toolchain, the fetched deps (zwasm/zlinter), and the build cache are
# all preserved across runs (actions/cache), so a warm run rebuilds only what
# changed instead of three cold ReleaseSafe builds — the dominant cost.

name: ci

on:
  # Skip CI on doc/scaffolding-only pushes (markdown, .dev/ ledger + ADRs + notes):
  # they cannot change build/test outcome, so a ~15-min gate on them is pure waste.
  # A commit that also touches src / scripts / build.zig* / flake.nix / .github /
  # a root data-yaml still runs (paths-ignore skips only when ALL changed files match).
  pull_request:
    paths-ignore: ['**/*.md', '.dev/**']
  push:
    branches: [main]
    paths-ignore: ['**/*.md', '.dev/**']
  workflow_dispatch:

permissions:
  contents: read

env:
  # Homebrew 6.0 (2026-05-30) enforces tap-trust: the macos-15 image ships a
  # pre-tapped third-party `aws/tap`, so every `brew` invocation (auto-update
  # included) spews a "not trusted / ignoring formulae" block and any future
  # third-party formula install would be rejected outright. Our own installs
  # are homebrew/core (official) so they still work, but this keeps the log
  # clean and future-proofs a third-party dep. Harmless on Linux (no brew).
  HOMEBREW_NO_REQUIRE_TAP_TRUST: 1

concurrency:
  group: ci-${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  gate:
    name: gate (${{ matrix.name }})
    runs-on: ${{ matrix.runs-on }}
    timeout-minutes: 75
    strategy:
      fail-fast: false
      matrix:
        include:
          - name: aarch64-macos
            runs-on: macos-15
            zig-dir: zig-aarch64-macos-0.16.0
          - name: x86_64-linux
            runs-on: ubuntu-22.04
            zig-dir: zig-x86_64-linux-0.16.0
    steps:
      - name: Checkout
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          ref: ${{ github.sha }}

      - name: Cache Zig 0.16.0
        id: cache-zig
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: ~/.local/zig-0.16.0
          key: zig-0.16.0-${{ matrix.name }}

      - name: Install Zig 0.16.0
        if: steps.cache-zig.outputs.cache-hit != 'true'
        shell: bash
        run: |
          set -euo pipefail
          source .github/versions.lock
          mkdir -p ~/.local
          curl -fsSL "https://ziglang.org/download/${ZIG_VERSION}/${{ matrix.zig-dir }}.tar.xz" -o /tmp/zig.tar.xz
          # Clear both paths first so a re-run is idempotent: tar refuses to
          # overwrite existing entries ("Cannot open: File exists"), and `mv` into
          # an EXISTING directory nests instead of replacing, which would put the
          # toolchain at zig-0.16.0/<zig-dir>/ and leave `zig` off PATH.
          rm -rf "$HOME/.local/${{ matrix.zig-dir }}" "$HOME/.local/zig-0.16.0"
          tar -xJf /tmp/zig.tar.xz -C ~/.local
          mv "$HOME/.local/${{ matrix.zig-dir }}" "$HOME/.local/zig-0.16.0"

      - name: Add Zig to PATH
        shell: bash
        run: echo "$HOME/.local/zig-0.16.0" >> "$GITHUB_PATH"

      - name: Pin Zig global cache dir
        shell: bash
        run: echo "ZIG_GLOBAL_CACHE_DIR=$HOME/.cache/zig" >> "$GITHUB_ENV"

      # Cache the fetched deps (zwasm git dep + zlinter, under the global cache's
      # p/) AND the build artifacts (global cache + the repo-local .zig-cache),
      # keyed on the manifests. A same-manifest run restores everything; a
      # manifest change falls back via restore-keys to the newest prior cache and
      # rebuilds incrementally (Zig's cache is content-addressed, so a stale
      # restore is safe — it only ever causes a rebuild, never a wrong build).
      - name: Cache Zig deps + build
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: |
            ~/.cache/zig
            .zig-cache
          key: ${{ matrix.name }}-zigbuild-${{ hashFiles('build.zig.zon', 'build.zig') }}
          restore-keys: |
            ${{ matrix.name }}-zigbuild-

      # Gate deps not universally preinstalled: ripgrep (check_debt_id_refs.sh)
      # and, on macOS, bash >= 4 — the macos-15 runner resolves `bash` to the
      # system 3.2, which cannot parse the e2e harness idioms (heredoc inside
      # `$()`, `case` inside `$()`, `declare -A`); 43 gate scripts fail under it
      # (first exposed by the 2026-07-02 nightly, the first FULL run on the
      # hosted mac runner). Every script is invoked as `bash foo.sh` or via
      # `#!/usr/bin/env bash`, so a brew bash 5 on PATH fixes all of them.
      # Install only what is absent (fast no-op when the image ships it).
      - name: Install gate deps if missing (ripgrep; bash>=4 on macOS)
        shell: bash
        run: |
          if [ "$RUNNER_OS" = "Linux" ]; then
            command -v rg >/dev/null 2>&1 || { sudo apt-get update -qq && sudo apt-get install -y -qq ripgrep; }
          else
            command -v rg >/dev/null 2>&1 || brew install ripgrep
            if [ "$(bash -c 'echo "${BASH_VERSINFO[0]}"')" -lt 4 ]; then
              brew install bash
            fi
          fi

      - name: Verify toolchain
        shell: bash
        run: |
          zig version
          python3 --version
          rg --version | head -1
          # Check the PATH-resolved bash (what `bash foo.sh` + env-shebang
          # scripts actually get), not this step's own shell.
          bash --version | head -1
          if [ "$(bash -c 'echo "${BASH_VERSINFO[0]}"')" -lt 4 ]; then
            echo "::error::gate requires bash >= 4 on PATH (PATH bash is $(bash -c 'echo "$BASH_VERSION"'))"; exit 1
          fi

      - name: ci_gate.sh
        shell: bash
        run: bash scripts/ci_gate.sh