runner-test/.github/workflows/01-checkout.yml

---
name: Checkout Variants (C1)

# Reusable workflow invoked by caller job c1 in 00-suite-runner.yml.
# Probes actions/checkout@v4 across its input matrix: default, fetch-depth,
# lfs, ref (tag), path, sparse-checkout cone mode, persist-credentials
# (true/false, with a non-vacuous assertion that the embedded credential
# token differs between the two), and an optional submodule checkout gated
# on a workflow_call input. on: workflow_call ONLY (no push/pull_request).

on:
  workflow_call:
    inputs:
      usesubmodule:
        description: Set to "true" to enable the submodule checkout test.
        required: false
        type: string
        default: 'false'

jobs:
  checkout-variants:
    runs-on: ubuntu-24.04
    steps:
      # --- default checkout: get repo + assert library ---
      - name: checkout-default
        uses: actions/checkout@v4

      - name: default-assert
        run: |
          source lib/assert.sh
          cp lib/assert.sh "$RUNNER_TEMP/assert.sh"
          assert_exists lib/assert.sh

      # --- fetch-depth: 0 (full history) ---
      - name: checkout-full-history
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: full-history-assert
        run: |
          source "$RUNNER_TEMP/assert.sh"
          count=$(git rev-list --count HEAD)
          is_gt1=false
          if [ "$count" -ge 1 ]; then is_gt1=true; fi
          assert_eq "$is_gt1" true "fetch-depth:0 sees full history ($count commits, >=1)"

      # --- lfs: true (conditional on git lfs availability) ---
      - name: checkout-lfs
        uses: actions/checkout@v4
        with:
          lfs: true

      - name: lfs-assert
        run: |
          source "$RUNNER_TEMP/assert.sh"
          if ! git lfs version >/dev/null 2>&1; then
            echo "SKIP: git lfs not available (documented skip)"
          else
            assert_exists test.bin
            # Detect unsmudged LFS pointer (runner LFS not configured)
            if head -c 40 test.bin | grep -q 'version https://git-lfs'; then
              echo "SKIP: test.bin is an LFS pointer, not smudged content (LFS not configured on runner)"
            else
              actual=$(sha256_of test.bin)
              expected=$(cat fixtures/test.bin.sha256)
              assert_eq "$actual" "$expected" "lfs smudged content sha256 matches fixture"
            fi
          fi

      # --- ref: v1-test (checkout a tag) ---
      # $RUNNER_TEMP/assert.sh copy is essential here: commit 36469e7 (v1-test)
      # predates lib/assert.sh, so the file is absent at this ref.
      - name: checkout-ref-tag
        uses: actions/checkout@v4
        with:
          ref: v1-test

      - name: ref-tag-assert
        run: |
          source "$RUNNER_TEMP/assert.sh"
          tag=$(git describe --tags --exact-match 2>/dev/null)
          assert_eq "$tag" v1-test "checked out tag is v1-test"

      # --- path: sub (checkout into a subdirectory) ---
      - name: checkout-path-sub
        uses: actions/checkout@v4
        with:
          path: sub

      - name: path-sub-assert
        run: |
          source "$RUNNER_TEMP/assert.sh"
          assert_exists sub/test.bin

      # --- sparse-checkout cone mode ---
      - name: checkout-sparse-cone
        uses: actions/checkout@v4
        with:
          sparse-checkout: |
            sparse-cone/keep
          sparse-checkout-cone-mode: true

      - name: sparse-cone-assert
        run: |
          source "$RUNNER_TEMP/assert.sh"
          assert_exists sparse-cone/keep/marker
          assert_not_exists sparse-cone/skip/marker

      # --- persist-credentials: true (separate path to avoid interference) ---
      - name: checkout-persist-true
        uses: actions/checkout@v4
        with:
          persist-credentials: true
          path: pc-true

      - name: persist-true-capture
        run: |
          source "$RUNNER_TEMP/assert.sh"
          url=$(git -C pc-true config --local remote.origin.url)
          printf '%s\n' "$url" > "$RUNNER_TEMP/url_true.txt"

      # --- persist-credentials: false (separate path) ---
      - name: checkout-persist-false
        uses: actions/checkout@v4
        with:
          persist-credentials: false
          path: pc-false

      - name: persist-credentials-assert
        run: |
          source "$RUNNER_TEMP/assert.sh"
          url_true=$(cat "$RUNNER_TEMP/url_true.txt")
          url_false=$(git -C pc-false config --local remote.origin.url)
          # Non-vacuous: true embeds a credential segment (scheme://user:token@host), false does not
          tok_true=false
          if [[ "$url_true" == *"://"*":"*"@"* ]]; then tok_true=true; fi
          assert_eq "$tok_true" true "persist-credentials:true embeds credential in remote.origin.url"
          tok_false=false
          if [[ "$url_false" == *"://"*":"*"@"* ]]; then tok_false=true; fi
          assert_eq "$tok_false" false "persist-credentials:false does NOT embed credential"
          differ=false
          if [ "$url_true" != "$url_false" ]; then differ=true; fi
          assert_eq "$differ" true "persist-credentials true/false URLs differ (non-vacuous)"

      # --- submodule (conditional on input) ---
      - name: checkout-submodule
        if: inputs.usesubmodule == 'true'
        uses: actions/checkout@v4
        with:
          submodules: true

      - name: submodule-assert
        if: inputs.usesubmodule == 'true'
        run: |
          source "$RUNNER_TEMP/assert.sh"
          assert_exists lib/assert.sh

      - name: submodule-skip
        if: inputs.usesubmodule != 'true'
        run: |
          echo "SKIP: submodule test is conditional (set workflow_call input usesubmodule=true to enable)"