cast/.github/workflows/ci.yml

name: ci

on:
  push:
    branches: [main]
  pull_request:

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          # fetch-depth: 0, for the changelog-monotonic step below and only
          # for it. That check is about a DIFF — which release headings the
          # merge base had — so it needs the base branch's history present,
          # and the default depth-1 checkout has none of it. An explicit
          # `git fetch origin <base>` would be narrower, but it has to be
          # right on both event types and on fork PRs, and getting it subtly
          # wrong degrades to a SKIP (a guard that silently stops guarding —
          # the exact failure this repo keeps refusing). Full history on a
          # tree this size costs a second; the STRICT flag below turns any
          # remaining skip red rather than green.
          fetch-depth: 0
      - uses: actions/setup-node@v4
        with:
          node-version: "22"
          cache: npm
      # the secrets tests round-trip a real age identity
      - run: sudo apt-get update && sudo apt-get install -y age
      - run: npm ci
      - run: npm run check
      - run: npm run build
      - run: npm test
      - name: installer is valid bash
        run: bash -n install.sh bin/cast scripts/*.sh .github/scripts/*.sh
      # `bash -n` above is a syntax check on a hand-maintained list; it is not
      # a linter and it does not notice a script it was never told about.
      # This sweep derives its list from git and asserts the list covers every
      # tracked *.sh, so a new script cannot go unlinted quietly (#118).
      - name: shellcheck — every tracked shell script
        run: bash .github/scripts/shellcheck-all.sh
      - name: labels state-machine tests
        run: bash test/labels-reconcile.sh

      # ...and no SHIPPED release heading was deleted or DUPLICATED (#133;
      # box#122's guard, box#143's ordering fix). Its own step so that when it
      # goes red the log names the invariant that broke — and a DIFFERENT
      # invariant from the arming rule npm test carries: arming is a fact
      # about this tree, monotonicity is a fact about this tree versus its
      # merge base. STRICT=1 so a checkout that cannot reach the base ref
      # fails here instead of skipping quietly forever.
      #
      # NOT pull-request-only, and that is the #133 fix at the workflow level.
      # The two halves have different vacuity: DELETION is vacuous on a push
      # to main (the merge base IS HEAD), but DUPLICATION is vacuous on no
      # tree at all, so gating the whole script on `pull_request` left a
      # duplicate that reached main by any other route unasserted forever.
      #
      # The `|| github.ref_name` fallback is load-bearing, not defensive. On a
      # push event `github.base_ref` is EMPTY, so the argument would collapse
      # to a bare `origin/`, which does not resolve — and STRICT=1 correctly
      # promotes that to a hard failure, turning every push to main red. With
      # the fallback it resolves to the pushed branch, whose merge base with
      # HEAD is HEAD or its parent: containment passes vacuously, exactly as
      # the old `if` intended, while uniqueness now runs on every push.
      - name: no shipped changelog heading was deleted or duplicated
        env:
          CHANGELOG_MONOTONIC_STRICT: "1"
        run: bash .github/scripts/changelog-monotonic.sh "origin/${{ github.base_ref || github.ref_name }}"

  # The installer, proven by RUNNING it — CAST_INSTALL_SOURCE points it at
  # this checkout, so CI proves the installer under review (the versioned
  # layout, the current symlink, the PATH chain, the uninstall's absence
  # assert), not a hand-built imitation of it. Box's CI installs box the
  # same way. This is the one place the real npm ci + tsc build path runs
  # end to end; the vitest installer tests cover the layout semantics
  # offline with a shimmed npm.
  install:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: "22"
          cache: npm
      - name: install via install.sh, from this checkout
        run: |
          CAST_NO_MODIFY_PATH=1 CAST_INSTALL_SOURCE="$GITHUB_WORKSPACE" bash install.sh
          # assert what landed: the layout, the chain, and that it answers
          readlink -f "$HOME/.local/bin/cast" | grep '/versions/'
          "$HOME/.local/bin/cast" --version
          "$HOME/.local/bin/cast" versions          
      - name: converging no-op — a re-run changes nothing and builds nothing
        run: |
          CAST_NO_MODIFY_PATH=1 CAST_INSTALL_SOURCE="$GITHUB_WORKSPACE" bash install.sh \
            | tee /tmp/rerun.log
          grep -q 'already installed' /tmp/rerun.log          
      - name: uninstall --all — ends with the absence assert
        run: |
          CAST_YES=1 "$HOME/.local/bin/cast" uninstall --all
          test ! -e "$HOME/.local/share/cast"
          test ! -e "$HOME/.local/bin/cast"
          test ! -L "$HOME/.local/bin/cast"