validate-task.yml

name: Validate task

# The fleet validation gate, hosted here once and reached by every repo's test-pull-request stub and its own publish-release stub.
# The jobs are test-matrix, lint, unit-test, and validate.
# The test-matrix job checks the python-versions and test-matrix inputs and builds the unit-test matrix.
# The lint job is the fleet doc-lint block plus language lint, by tree detection.
# For Python it lints the declared directories, and it also runs the prose gate and the repo gate.
# The unit-test job is a generic dotnet test, and a pytest or unittest suite under coverage in each Python directory.
# It runs once per interpreter the python-versions input names, or once per test-matrix leg.
# The validate job is the validate hook, a repo's own domain checks.
# Examples are an ESPHome compile, a Hugo build, a KiCad ERC, a codegen-drift check, or PowerShell tests.
# No permissions beyond contents: read where a job needs one, since every job here only checks out and reads.
# No required inputs, markdown-exclude-globs, repo-gate-exclude-globs, python-directories, python-versions and test-matrix are the optional inputs, and CODECOV_TOKEN is the one optional secret, since coverage upload is best-effort.
# Hub-owned gates and default hooks resolve through $/ at the reusable workflow's commit, so each implementation is reproducible against the caller's released pin without a second checkout.
on:
  workflow_call:
    inputs:
      # Appended after '**/*.md', not validated: a negated glob excludes, a non-negated one adds to what is linted.
      markdown-exclude-globs:
        description: Negated globs to exclude, one per line (for example '!content/**'), appended after '**/*.md'. A non-negated line adds to what is linted rather than narrowing it.
        required: false
        type: string
        default: ''
      # Threaded to the repo-gate composite action's own exclude-globs input, unvalidated.
      repo-gate-exclude-globs:
        description: Git pathspec patterns to exclude, one per line (for example 'themes/PaperMod/**'), narrowing the sha-pin, eol-coverage, and composite-actions scans via repo_gate.py's --exclude.
        required: false
        type: string
        default: ''
      # Resolved and checked by the python-directories action, which both Python jobs run, so a malformed declaration fails before any tool runs.
      python-directories:
        description: Repository-relative directories holding a Python project, one per line (for example 'RegressionTests'), each with a tracked pyproject.toml. Each is linted, type checked, and tested under coverage. Empty gates the root where a root pyproject.toml is tracked. List '.' alongside a subdirectory to keep the root gated too.
        required: false
        type: string
        default: ''
      # Built into the unit-test matrix by the test-matrix job, and read raw by its python-versions check and the lint job's Sync Python dependencies step.
      python-versions:
        description: JSON array of the Python versions the pytest leg runs under, one leg per entry, for example ["3.13", "3.14"]. With test-matrix set, only the first entry is used, as the fallback interpreter. Quote each entry, since an unquoted one is a JSON number rather than a version string.
        required: false
        type: string
        default: '["3.13"]'
      test-matrix:
        description: JSON array of objects, one pytest leg per entry. Each has a unique label of 1 to 38 characters from A-Z, a-z, 0-9, underscore, dot, or hyphen. Each may have a python-version, defaulting to the first python-versions entry. Each leg calls the caller's .github/actions/install-test-deps hook after the base install, with the entry as its leg input. Empty runs the python-versions legs with no hook.
        required: false
        type: string
        default: ''
    secrets:
      CODECOV_TOKEN:
        required: false

jobs:

  test-matrix:
    name: Build test matrix job
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      matrix: ${{ steps.build.outputs.matrix }}
    steps:

      - name: Validate test-matrix input step
        if: ${{ inputs.test-matrix != '' }}
        env:
          TEST_MATRIX: ${{ inputs.test-matrix }}
        run: |
          set -Eeuo pipefail
          if ! jq -e -s '
            length == 1 and (.[0] |
              type == "array" and length > 0
              and all(.[]; type == "object"
                and (.label | type == "string" and test("\\A[A-Za-z0-9_.-]{1,38}\\z"))
                and ((has("python-version") | not) or (.["python-version"] | type == "string" and test("\\S"))))
              and ((map(.label) | unique | length) == length))
          ' <<<"$TEST_MATRIX" >/dev/null 2>&1; then
            escaped=${TEST_MATRIX//'%'/%25}
            escaped=${escaped//$'\r'/%0D}
            escaped=${escaped//$'\n'/%0A}
            echo "::error::The test-matrix input must be a non-empty JSON array of objects, each with a unique label of 1 to 38 characters from A-Z, a-z, 0-9, underscore, dot, or hyphen, and a python-version, when present, that is a string with a non-whitespace character, got: $escaped"
            exit 1
          fi

      # An entry holding no non-whitespace character would otherwise run green on an interpreter nobody chose.
      # That is because setup-uv trims what it reads and then reads an empty input as an absent one.
      # A caller reaches it by interpolating an unset value of its own, and a stray space in that template reaches it just as well.
      # That is why the entry test is for content rather than for length.
      # An unquoted entry is the other half of the same slip, and what it costs depends on the number fromJSON parsed it into.
      # Some of those numbers uv resolves to a real interpreter rather than refusing.
      # So that shape is a second silent pass, which this check prevents rather than names as a cause.
      # The check reads the raw input rather than matrix.python-version, which by then cannot say whether its 3.2 was written 3.2 or 3.20.
      # With test-matrix set, python-versions never expands, so this step alone guards the first entry that setup-uv reads.
      - name: Validate python-versions input step
        env:
          PYTHON_VERSIONS: ${{ inputs.python-versions }}
        run: |
          set -Eeuo pipefail
          if ! jq -e -s 'length == 1 and (.[0] | type == "array" and length > 0 and all(.[]; type == "string" and test("\\S")))' <<<"$PYTHON_VERSIONS" >/dev/null 2>&1; then
            # The annotation carries the rejected value, so it is escaped per the workflow command encoding rules first.
            # A raw newline would end the annotation and let whatever follows it start a command of its own.
            # The runner reads a command off stderr as readily as stdout, so redirecting rather than escaping would close nothing.
            # The percent substitution runs first, since running it after the others would re-encode the percent each of them just introduced.
            escaped=${PYTHON_VERSIONS//'%'/%25}
            escaped=${escaped//$'\r'/%0D}
            escaped=${escaped//$'\n'/%0A}
            echo "::error::The python-versions input must be a non-empty JSON array of non-empty quoted version strings, for example '[\"3.13\", \"3.14\"]', got: $escaped"
            exit 1
          fi

      # A matrix built inline from inputs expands at planning time, before needs: runs, so a malformed value could not be named.
      - name: Build unit-test matrix step
        id: build
        env:
          TEST_MATRIX: ${{ inputs.test-matrix }}
          PYTHON_VERSIONS: ${{ inputs.python-versions }}
        run: |
          set -Eeuo pipefail
          if [[ -n "$TEST_MATRIX" ]]; then
            matrix=$(jq -c -s '{include: .[0]}' <<<"$TEST_MATRIX")
          else
            matrix=$(jq -c --argjson versions "$PYTHON_VERSIONS" -n '{"python-version": $versions}')
          fi
          echo "matrix=$matrix" >> "$GITHUB_OUTPUT"

  lint:
    name: Lint sources job
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:

      # Full history, since the dead-path prose rule keys on deletion history and the prose gate diffs against a base branch.
      # A shallow clone holds neither, and both stand down there rather than pass blind.
      - name: Checkout code step
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          fetch-depth: 0

      # The fleet doc-lint block, hosted once rather than carried by every repo of every type.
      # An empty markdown-exclude-globs leaves a blank line here, which the action ignores, so the default caller passes nothing extra.
      - name: Lint Markdown step
        uses: DavidAnson/markdownlint-cli2-action@21c1be1b93ad9ed58fa840aacc3f279cde2a72ff # v24.2.0
        with:
          globs: |
            **/*.md
            ${{ inputs.markdown-exclude-globs }}

      # The spell check covers README + HISTORY only, per CODESTYLE.md "Markdown and Spelling".
      - name: Spell check step
        uses: streetsidesoftware/cspell-action@6f3c77c1406bc930f944ba97e9801a22e42caf58 # v9.1.0
        with:
          files: |
            README.md
            HISTORY.md
          incremental_files_only: false

      - name: Lint workflows step
        uses: raven-actions/actionlint@3d39aea434753780c3b3d4a1a31c854b4dbf49d7 # v2.2.0

      - name: Check EditorConfig step
        run: docker run --rm --pull=always -v "$PWD":/check --workdir /check ghcr.io/editorconfig-checker/editorconfig-checker:latest

      # The file list comes from git rather than a glob, and the docker run is skipped rather than invoked on an empty argument list.
      # That is how a repo with no shell scripts stays clean instead of failing on a linter's own no-file usage error.
      # A `*.sh` glob alone misses a bare-command script with no extension, so a shebang-matched file joins the list too.
      - name: Check shell scripts step
        run: |
          set -Eeuo pipefail
          # Tokenizes rather than substring-matches, so `#!/usr/bin/python bash` is not mistaken for a shell script.
          # `docker_lint.py`'s shell_shebang_interpreter is the same logic; keep both in sync on a change here.
          is_shell_shebang() {
            local line="$1"
            [[ "$line" == '#!'* ]] || return 1
            local -a tokens
            read -ra tokens <<< "${line#\#!}"
            [ "${#tokens[@]}" -gt 0 ] || return 1
            local interpreter="${tokens[0]##*/}"
            if [[ "$interpreter" == "bash" || "$interpreter" == "sh" ]]; then
              return 0
            fi
            [[ "$interpreter" == "env" ]] || return 1
            local -a args=("${tokens[@]:1}")
            local token
            while [ "${#args[@]}" -gt 0 ]; do
              token="${args[0]}"
              if [[ "$token" == "--" ]]; then
                args=("${args[@]:1}")
                break
              fi
              if [[ "$token" == "-S" || "$token" == "--split-string" ]]; then
                args=("${args[@]:1}")
                break
              fi
              if [[ "$token" == -* ]]; then
                case "$token" in
                -u | --unset | -C | --chdir)
                  args=("${args[@]:2}")
                  ;;
                *)
                  args=("${args[@]:1}")
                  ;;
                esac
                continue
              fi
              if [[ "$token" =~ ^[A-Za-z_][A-Za-z0-9_]*= ]]; then
                args=("${args[@]:1}")
                continue
              fi
              break
            done
            [ "${#args[@]}" -gt 0 ] || return 1
            local cmd="${args[0]##*/}"
            [[ "$cmd" == "bash" || "$cmd" == "sh" ]]
          }
          mapfile -t scripts < <(git ls-files '*.sh')
          mapfile -d '' -t candidates < <(git ls-files -z)
          for file in "${candidates[@]}"; do
            base="${file##*/}"
            # Never follows a tracked symlink: -h short-circuits before -f's own dereferencing stat.
            if [[ "$base" != *.* ]] && [ ! -h "$file" ] && [ -f "$file" ]; then
              # `head` reads a no-trailing-newline file cleanly and still fails on a genuine read error.
              first_line="$(head -n 1 -- "$file")"
              if is_shell_shebang "$first_line"; then
                scripts+=("$file")
              fi
            fi
          done
          if [ "${#scripts[@]}" -gt 0 ]; then
            docker run --rm --pull=always -v "$PWD":/mnt --workdir /mnt mirror.gcr.io/koalaman/shellcheck:stable -- "${scripts[@]}"
            docker run --rm --pull=always -v "$PWD":/mnt --workdir /mnt mirror.gcr.io/mvdan/shfmt:latest -d -- "${scripts[@]}"
          else
            echo "no shell scripts are tracked"
          fi

      # The peer of the step above: the file list comes from git, and the container only starts when there is something for it to check.
      # A repo with no .ps1 files pays nothing for the pull.
      # 1.23.0 rather than the newest, since 1.24.0 needs a newer System.Management.Automation than this image carries, which installs and then fails to import.
      - name: Check PowerShell scripts step
        run: |
          set -Eeuo pipefail
          mapfile -t ps_scripts < <(git ls-files '*.ps1')
          if [ "${#ps_scripts[@]}" -gt 0 ]; then
            docker run --rm --pull=always -e PS_SCRIPTS="$(git ls-files '*.ps1')" -v "$PWD":/mnt --workdir /mnt mcr.microsoft.com/powershell:latest \
              pwsh -NoProfile -Command '
                Set-PSRepository PSGallery -InstallationPolicy Trusted
                Install-Module PSScriptAnalyzer -RequiredVersion 1.23.0 -Force -Scope AllUsers
                Import-Module PSScriptAnalyzer
                $files = $env:PS_SCRIPTS -split "\s+" | Where-Object { $_ }
                $found = @()
                foreach ($file in $files) { $found += Invoke-ScriptAnalyzer -Path $file -Settings ./PSScriptAnalyzerSettings.psd1 }
                Write-Host "Checked $($files.Count) file(s)"
                if ($found) { $found | Format-Table RuleName,Severity,ScriptName,Line,Message -AutoSize | Out-String -Width 200 | Write-Host; exit 1 }
                Write-Host "no findings"
              '
          else
            echo "no PowerShell scripts are tracked"
          fi

      # Language lint by tree detection: a caller carries a language marker file or it does not.
      # Python is the one exception, gated in the directories the python-directories input declares.
      - name: Setup .NET SDK step
        if: hashFiles('**/*.csproj') != ''
        uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
        with:
          dotnet-version: 10.x

      - name: Restore dotnet tools step
        if: >-
          hashFiles('**/*.csproj') != '' && hashFiles('.config/dotnet-tools.json') != ''
        run: dotnet tool restore

      # CSharpier is a local dotnet tool, so it needs the manifest restored above.
      # A caller with no manifest skips rather than failing on a generic unknown-command error against a tool the runner never installed.
      - name: Check C# formatting step
        if: >-
          hashFiles('**/*.csproj') != '' && hashFiles('.config/dotnet-tools.json') != ''
        run: dotnet csharpier check .

      # The dotnet SDK ships dotnet format, so it needs no tool restore.
      # The severity and verbosity flags match the fleet's canonical invocation, per CODESTYLE.md and PhotoCleaner's own gate.
      - name: Check C# style step
        if: hashFiles('**/*.csproj') != ''
        run: dotnet format style --verify-no-changes --severity=info --verbosity=detailed

      - name: Resolve Python directories step
        id: python
        uses: $/.github/actions/python-directories
        with:
          directories: ${{ inputs.python-directories }}
          report-uncovered: 'true'

      # @latest rather than a version pin, since a `uvx <tool>@<ver>` pin is nothing Dependabot tracks and would silently go stale, where the action SHA above is Dependabot-tracked.
      # This is the one place the fleet's uvx tools are pinned or floated, decided here.
      - name: Setup uv step
        if: steps.python.outputs.any == 'true' || hashFiles('.github/actions/**/action.yml', '.github/actions/**/action.yaml') != ''
        uses: astral-sh/setup-uv@c18668ad3cf93ea998bef934396af7bb5c839dc7 # v10.2.0
        with:
          python-version: "3.13"

      # A declared pip directory's requirements are installed for its type check, which an undeclared root never had.
      # They install under the first interpreter the caller names, since they need not resolve under the one this job pins, and UV_PYTHON is what every uv call below reads for it.
      - name: Sync Python dependencies step
        if: steps.python.outputs.any == 'true'
        env:
          PYTHON_VERSIONS: ${{ inputs.python-versions }}
          PYTHON_PROJECTS: ${{ steps.python.outputs.projects }}
          DECLARED: ${{ steps.python.outputs.declared }}
        run: |
          set -Eeuo pipefail
          # One resolve over the collected requirements files, since the glob sorts the base file last and a per-file install would let its pins downgrade what the test file just resolved.
          install_requirements() {
            if [ -n "${PIP_PYTHON:-}" ]; then
              export UV_PYTHON="$PIP_PYTHON"
            fi
            uv venv
            local requirement_args=()
            local file
            for file in requirements*.txt; do
              requirement_args+=(-r "$file")
            done
            uv pip install "${requirement_args[@]}"
            if python3 -c 'import sys, tomllib; sys.exit("project" not in tomllib.load(open("pyproject.toml", "rb")))'; then
              uv pip install -e .
            fi
          }
          while IFS=$'\t' read -r kind dir; do
            [ -n "$dir" ] || continue
            if [ "$kind" = uv ]; then
              (cd "$dir" && uv sync --all-groups --frozen) < /dev/null
            elif [ "$kind" = pip ] && [ "$DECLARED" = "true" ]; then
              # Read here rather than through fromJSON, which would fail this job on a malformed input with no cause named.
              if ! PIP_PYTHON=$(jq -er -s 'if length == 1 and (.[0] | type == "array" and length > 0 and (.[0] | type == "string" and test("\\S"))) then .[0][0] else error("") end' <<< "$PYTHON_VERSIONS" 2> /dev/null); then
                echo "::error::The python-versions input must be a non-empty JSON array of quoted version strings, whose first entry installs the declared pip directory $dir."
                exit 1
              fi
              (cd "$dir" && install_requirements) < /dev/null
            fi
          done <<< "$PYTHON_PROJECTS"

      - name: Lint Python step
        if: steps.python.outputs.any == 'true'
        env:
          PYTHON_PROJECTS: ${{ steps.python.outputs.projects }}
        run: |
          set -Eeuo pipefail
          while IFS=$'\t' read -r kind dir; do
            [ -n "$dir" ] || continue
            echo "ruff check in $dir"
            if [ "$kind" = uv ]; then
              (cd "$dir" && uv run ruff check .) < /dev/null
            else
              (cd "$dir" && uvx ruff@latest check .) < /dev/null
            fi
          done <<< "$PYTHON_PROJECTS"

      - name: Check Python formatting step
        if: steps.python.outputs.any == 'true'
        env:
          PYTHON_PROJECTS: ${{ steps.python.outputs.projects }}
        run: |
          set -Eeuo pipefail
          while IFS=$'\t' read -r kind dir; do
            [ -n "$dir" ] || continue
            echo "ruff format --check in $dir"
            if [ "$kind" = uv ]; then
              (cd "$dir" && uv run ruff format --check .) < /dev/null
            else
              (cd "$dir" && uvx ruff@latest format --check .) < /dev/null
            fi
          done <<< "$PYTHON_PROJECTS"

      # Mypy takes precedence where a config declares both, matching every repo that runs mypy in CI today.
      # A pyright-only config, with no mypy section, falls back to pyright instead.
      # A declared directory's standalone mypy.ini or .mypy.ini, setup.cfg [mypy] section, or pyrightconfig.json counts too, the placement a Home Assistant integration keeps, while the undeclared root reads only the pyproject sections it always did.
      # A declared subdirectory configuring neither falls back to the repository root's config and runs the checker from the root, the way a monorepo keeping one config there runs it.
      # A repo that genuinely wants both enforced adds the second as its own validate hook step.
      - name: Type check Python step
        if: steps.python.outputs.any == 'true'
        env:
          PYTHON_PROJECTS: ${{ steps.python.outputs.projects }}
          DECLARED: ${{ steps.python.outputs.declared }}
        run: |
          set -Eeuo pipefail
          has_section() {
            [ -f "$1" ] && grep -Eq "^[[:space:]]*\[$2\]" "$1"
          }
          find_checker() {
            checker=
            if has_section "$1/pyproject.toml" 'tool\.mypy' || { [ "$2" = true ] && { [ -f "$1/mypy.ini" ] || [ -f "$1/.mypy.ini" ] || has_section "$1/setup.cfg" mypy; }; }; then
              checker=mypy
            elif has_section "$1/pyproject.toml" 'tool\.pyright' || { [ "$2" = true ] && [ -f "$1/pyrightconfig.json" ]; }; then
              checker=pyright
            fi
          }
          # Reads python_version only from the one config file mypy loads, and only from its mypy section.
          pins_python_version() {
            local file section
            if [ -f "$1/mypy.ini" ]; then
              file="$1/mypy.ini" section=mypy
            elif [ -f "$1/.mypy.ini" ]; then
              file="$1/.mypy.ini" section=mypy
            elif has_section "$1/pyproject.toml" 'tool\.mypy'; then
              file="$1/pyproject.toml" section=tool.mypy
            elif has_section "$1/setup.cfg" mypy; then
              file="$1/setup.cfg" section=mypy
            else
              return 1
            fi
            awk -v want="[$section]" '/^[[:space:]]*\[/ { h = $0; sub(/[#;].*/, "", h); gsub(/[[:space:]]/, "", h); on = (h == want); next } on && /^[[:space:]]*python_version[[:space:]]*[=:]/ { found = 1 } END { exit !found }' "$file"
          }
          while IFS=$'\t' read -r kind dir; do
            [ -n "$dir" ] || continue
            find_checker "$dir" "$DECLARED"
            config_dir="$dir"
            if [ -z "$checker" ] && [ "$DECLARED" = "true" ] && [ "$dir" != . ]; then
              find_checker . true
              config_dir=.
            fi
            if [ -z "$checker" ] && [ "$DECLARED" = "true" ]; then
              echo "::error::The declared Python directory $dir configures neither mypy nor pyright, in its pyproject.toml, in a mypy.ini, .mypy.ini, setup.cfg, or pyrightconfig.json beside it, or in the same files at the repository root. Every Python directory owes a type check."
              exit 1
            elif [ -z "$checker" ]; then
              echo "no [tool.mypy] or [tool.pyright] section in $dir/pyproject.toml, skipping"
              continue
            fi
            echo "$checker in $dir, configured in $config_dir"
            project="$(cd "$dir" && pwd)"
            # Run from the root, a checker reads the root config's own file selection, so the directory is named to keep it the one checked.
            targets=()
            if [ "$config_dir" != "$dir" ]; then
              targets=("$dir")
            fi
            venv_python="$project/.venv/bin/python"
            if [ "$kind" = uv ]; then
              (cd "$config_dir" && uv run --project "$project" "$checker" "${targets[@]}") < /dev/null
            elif [ "$kind" = pip ] && [ "$DECLARED" = "true" ] && [ "$checker" = mypy ]; then
              if "$venv_python" -c 'import importlib.util, sys; sys.exit(importlib.util.find_spec("mypy") is None)'; then
                # The venv's own mypy imports the plugins installed beside it and targets its interpreter already.
                (cd "$config_dir" && "$venv_python" -m mypy "${targets[@]}") < /dev/null
              else
                # Left alone, mypy under uvx targets the interpreter it runs under, so the venv's version is passed unless the config pins its own, which the flag would override.
                version_args=()
                if ! pins_python_version "$config_dir"; then
                  version_args=(--python-version "$("$venv_python" -c 'import sys; print("%d.%d" % sys.version_info[:2])')")
                fi
                (cd "$config_dir" && uvx mypy@latest --python-executable "$venv_python" "${version_args[@]}" "${targets[@]}") < /dev/null
              fi
            elif [ "$kind" = pip ] && [ "$DECLARED" = "true" ]; then
              (cd "$config_dir" && uvx pyright@latest --pythonpath "$venv_python" "${targets[@]}") < /dev/null
            else
              (cd "$config_dir" && uvx "$checker@latest" "${targets[@]}") < /dev/null
            fi
          done <<< "$PYTHON_PROJECTS"

      - name: Read comments label step
        id: comments-label
        if: github.event.pull_request != null
        env:
          GH_TOKEN: ${{ github.token }}
          LABELS_PATH: repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/labels
          PAYLOAD_LABELED: ${{ contains(github.event.pull_request.labels.*.name, 'comments') }}
        run: |
          set -Eeuo pipefail
          if names=$(gh api --paginate --jq '.[].name' "$LABELS_PATH"); then
            labeled=false
            if grep -qxiF comments <<< "$names"; then
              labeled=true
            fi
            echo "Read the pull request's labels live, comments label present: $labeled."
          else
            labeled=$PAYLOAD_LABELED
            echo "The pull request's labels could not be read live, so the event payload's snapshot decides, comments label present: $labeled."
          fi
          echo "labeled=$labeled" >> "$GITHUB_OUTPUT"

      - name: Resolve prose base step
        id: prose-base
        if: github.event.pull_request != null
        env:
          EVENT_BASE: ${{ github.event.pull_request.base.sha }}
        run: |
          set -Eeuo pipefail
          base=$EVENT_BASE
          if git rev-parse --verify --quiet 'HEAD^2^{commit}' > /dev/null; then
            base=$(git rev-parse --verify 'HEAD^1^{commit}')
          fi
          echo "Prose diff base: $base, the event's base.sha: $EVENT_BASE."
          echo "base=$base" >> "$GITHUB_OUTPUT"

      # A publish run's content is already gated by the pull request that introduced it.
      - name: Check prose step
        if: github.event.pull_request != null
        uses: $/.github/actions/prose-gate
        with:
          base: ${{ steps.prose-base.outputs.base }}
          # The label is read off the pull request rather than passed as an input a caller sets.
          # A repository cannot then leave the override on, since it is reapplied per change by hand.
          # A promotion runs develop into the default branch, and it diffs against that branch's tip.
          # Its scope is therefore every line promoted since the last one, all of it already reviewed where it landed.
          # So the comment rule stands down there, rather than reporting a whole release's comments as this change's.
          # The head branch is tested as well as the base, since a feature branch may target the default branch directly and that one carries new lines.
          # The head repository is tested too, since a fork's branch may be named `develop` and its lines were reviewed nowhere.
          allow-comments: ${{ steps.comments-label.outputs.labeled == 'true' || (github.event.pull_request.head.repo.full_name == github.repository && github.head_ref == 'develop' && github.base_ref == github.event.repository.default_branch) }}

      # An empty repo-gate-exclude-globs leaves the action's own input at its default, so the default caller excludes nothing.
      - name: Check repo gates step
        uses: $/.github/actions/repo-gate
        with:
          exclude-globs: ${{ inputs.repo-gate-exclude-globs }}

  # No job-level if: here, since GitHub Actions does not evaluate hashFiles in a job condition, only a step one.
  # Every step below carries its own guard instead, a tree-detection one on the .NET half and the resolved Python directories on the Python half.
  # A caller with no *Tests*.csproj and no Python directory runs every guard false, and the job reports success having done nothing, which is the clean skip this job promises.
  # A declared Python directory owes a tests/ suite under coverage, per D1.6, so one without tests/ fails here rather than skipping.
  # The root default keeps the old gate, a pytest suite in tests/ beside a uv.lock or requirements*.txt, since a caller declaring nothing has not yet taken on that obligation.
  # The matrix dimension is the interpreter, or the test-matrix leg when that is set.
  # A caller naming neither runs the single leg this job ran before the input existed.
  # A python-versions leg names an interpreter whether or not one ran.
  # So a .NET-only caller reports a Python version its Python steps never used.
  # A caller naming several also repeats this job's .NET half once per leg, which spends runner minutes and re-uploads an identical report rather than measuring anything new, and splitting the two halves into jobs of their own is what that costs, owed by the first repo to carry both a .NET test project and more than one interpreter.
  unit-test:
    name: Unit test job (${{ matrix.label || format('Python {0}', matrix.python-version) }})
    needs: test-matrix
    runs-on: ubuntu-latest
    permissions:
      contents: read
    strategy:
      # A failing interpreter must not cancel its siblings, since which of them fail is the whole point of running more than one.
      fail-fast: false
      matrix: ${{ fromJSON(needs.test-matrix.outputs.matrix) }}

    steps:

      - name: Checkout code step
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      - name: Check caller install-test-deps hook step
        if: ${{ inputs.test-matrix != '' }}
        env:
          HOOK_FOUND: ${{ hashFiles('.github/actions/install-test-deps/action.yml') != '' }}
        run: |
          set -Eeuo pipefail
          if [[ "$HOOK_FOUND" != "true" ]]; then
            echo "::error::The test-matrix input is set but .github/actions/install-test-deps/action.yml is missing."
            exit 1
          fi

      - name: Setup .NET SDK step
        if: hashFiles('**/*Tests*.csproj') != ''
        uses: actions/setup-dotnet@a98b56852c35b8e3190ac28c8c2271da59106c68 # v6.0.0
        with:
          dotnet-version: 10.x

      # --coverage-output stays unset because pinning one filename gives every test project in the solution the same path, and the last to finish overwrites the rest.
      # The default <guid>.cobertura.xml written instead is a name codecov-cli's finder does not match, so each report is prefixed rather than renamed, keeping the guid that makes it unique.
      - name: Run unit tests step
        if: hashFiles('**/*Tests*.csproj') != ''
        run: |
          set -Eeuo pipefail
          rm -rf ./coverage
          dotnet test --coverage --coverage-output-format cobertura --results-directory ./coverage
          written=0
          for report in ./coverage/*.cobertura.xml; do
            [ -e "$report" ] || continue
            renamed="./coverage/coverage-$(basename "$report")"
            mv "$report" "$renamed"
            if [ -s "$renamed" ]; then
              written=1
            fi
          done
          if [ "$written" -eq 0 ]; then
            echo "::error::This run wrote no non-empty Cobertura report under ./coverage. Reference Microsoft.Testing.Extensions.CodeCoverage from each test project, per CODESTYLE.md's .NET side."
            exit 1
          fi

      # Report-only: fail_ci_if_error is false so a Codecov hiccup or an absent token never fails the gate.
      - name: Upload coverage to Codecov step
        if: hashFiles('**/*Tests*.csproj') != ''
        uses: codecov/codecov-action@303a32d7a59b442fa8d48b6a1cc6825c09c847a5 # v7.1.1
        with:
          directory: ./coverage
          fail_ci_if_error: false
        env:
          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

      - name: Resolve Python directories step
        id: python
        uses: $/.github/actions/python-directories
        with:
          directories: ${{ inputs.python-directories }}

      # A root the undeclared default skips still sets uv up, so an empty cache is a normal outcome rather than an error at post-job save.
      - name: Setup uv step
        if: steps.python.outputs.any == 'true'
        uses: astral-sh/setup-uv@c18668ad3cf93ea998bef934396af7bb5c839dc7 # v10.2.0
        with:
          python-version: ${{ matrix.python-version || fromJSON(inputs.python-versions)[0] }}
          ignore-nothing-to-cache: true

      - name: Install Python dependencies step
        if: ${{ steps.python.outputs.any == 'true' && inputs.test-matrix != '' }}
        env:
          PYTHON_PROJECTS: ${{ steps.python.outputs.projects }}
          DECLARED: ${{ steps.python.outputs.declared }}
        run: |
          set -Eeuo pipefail
          install_requirements() {
            uv venv
            local requirement_args=()
            local file
            for file in requirements*.txt; do
              requirement_args+=(-r "$file")
            done
            uv pip install "${requirement_args[@]}"
            if python3 -c 'import sys, tomllib; sys.exit("project" not in tomllib.load(open("pyproject.toml", "rb")))'; then
              uv pip install -e .
            fi
          }
          while IFS=$'\t' read -r kind dir; do
            [ -n "$dir" ] || continue
            if [ "$DECLARED" != "true" ] && [ ! -d "$dir/tests" ]; then
              continue
            fi
            (
              cd "$dir"
              case "$kind" in
              uv) uv sync --all-groups --frozen ;;
              pip) install_requirements ;;
              esac
            ) < /dev/null
          done <<< "$PYTHON_PROJECTS"

      - name: Run caller install-test-deps hook step
        if: ${{ steps.python.outputs.any == 'true' && inputs.test-matrix != '' }}
        uses: ./.github/actions/install-test-deps
        with:
          leg: ${{ toJSON(matrix) }}
          directories: ${{ steps.python.outputs.projects }}

      # A directory's dependency manifest decides how its suite runs, a committed uv.lock or a requirements*.txt through pytest, and neither through unittest, the lint-only profile being stdlib-only.
      # --cov-report=xml names the report format and selects nothing to measure, so a pytest directory's own pyproject.toml supplies the --cov selector, per D1.6.
      # The report is checked rather than assumed, because the best-effort upload below reads a missing file exactly as it reads a healthy run.
      # The pre-run delete makes that a check on what this run wrote, since a committed coverage.xml would otherwise satisfy it without any measurement.
      # Each directory's run reads /dev/null, since the loop's own list is its stdin and a suite reading stdin would swallow the directories after it.
      - name: Run Python tests step
        id: python-tests
        if: steps.python.outputs.any == 'true'
        env:
          PYTHON_PROJECTS: ${{ steps.python.outputs.projects }}
          DECLARED: ${{ steps.python.outputs.declared }}
          HOOK_LEG: ${{ inputs.test-matrix != '' }}
        run: |
          set -Eeuo pipefail
          # One resolve over the collected requirements files, since the glob sorts the base file last and a per-file install would let its pins downgrade what the test file just resolved.
          install_requirements() {
            if [ -n "${PIP_PYTHON:-}" ]; then
              export UV_PYTHON="$PIP_PYTHON"
            fi
            uv venv
            local requirement_args=()
            local file
            for file in requirements*.txt; do
              requirement_args+=(-r "$file")
            done
            uv pip install "${requirement_args[@]}"
            if python3 -c 'import sys, tomllib; sys.exit("project" not in tomllib.load(open("pyproject.toml", "rb")))'; then
              uv pip install -e .
            fi
          }
          reports=()
          while IFS=$'\t' read -r kind dir; do
            [ -n "$dir" ] || continue
            if [ "$DECLARED" != "true" ] && { [ ! -d "$dir/tests" ] || [ "$kind" = lint-only ] || [ "$kind" = unsupported ]; }; then
              echo "the undeclared root runs only a pytest suite with a dependency manifest beside it, skipping"
              continue
            fi
            if [ "$kind" = unsupported ]; then
              echo "::error::The declared Python directory $dir declares a project with no uv.lock or requirements*.txt of its own, so the validator cannot install its dependencies. Declare a uv workspace's root rather than its member."
              exit 1
            fi
            if [ "$DECLARED" = "true" ] && [ ! -d "$dir/tests" ]; then
              echo "::error::The declared Python directory $dir has no tests/ directory. Every Python directory owes a test suite run under coverage, per D1.6."
              exit 1
            fi
            if [ "$DECLARED" = "true" ] && [ -z "$(find "$dir/tests" -name '*.py' -print -quit)" ]; then
              echo "::error::The declared Python directory $dir has no Python files under tests/. Every Python directory owes a test suite run under coverage, per D1.6."
              exit 1
            fi
            echo "tests in $dir ($kind)"
            rm -f "$dir/coverage.xml"
            (
              cd "$dir"
              case "$kind" in
              uv)
                if [ "${HOOK_LEG:-false}" = "true" ]; then
                  uv run --no-sync pytest --cov-report=xml
                else
                  uv sync --all-groups --frozen
                  uv run pytest --cov-report=xml
                fi
                ;;
              pip)
                if [ "${HOOK_LEG:-false}" != "true" ]; then
                  install_requirements
                fi
                .venv/bin/python -m pytest --cov-report=xml
                ;;
              lint-only)
                status=0
                uvx coverage@latest run -m unittest discover -s tests || status=$?
                if [ "$status" -eq 5 ]; then
                  echo "::error::unittest found no tests in $dir/tests. Discovery collects only unittest.TestCase subclasses, so a pytest-style plain test function does not count, it reads only files named test*.py, and it skips a nested test directory that has no __init__.py."
                fi
                [ "$status" -eq 0 ] || exit "$status"
                uvx coverage@latest xml -o coverage.xml
                ;;
              esac
            ) < /dev/null
            if [[ ! -s "$dir/coverage.xml" ]]; then
              echo "::error::This run wrote no coverage.xml in $dir. A pytest directory selects its coverage source in its own pyproject.toml, an addopts entry of --cov=<package> in practice, since --cov-report=xml alone measures nothing."
              exit 1
            fi
            reports+=("$dir/coverage.xml")
          done <<< "$PYTHON_PROJECTS"
          files=$(IFS=,; printf '%s' "${reports[*]}")
          echo "files=$files" >> "$GITHUB_OUTPUT"

      # Best-effort: continue-on-error plus fail_ci_if_error false, so a missing token never reds the gate.
      # The flag names the leg, so a multi-interpreter repo reads its legs apart in Codecov rather than seeing one merged number for all of them.
      - name: Upload coverage to Codecov step (Python)
        if: steps.python-tests.outputs.files != ''
        continue-on-error: true
        uses: codecov/codecov-action@303a32d7a59b442fa8d48b6a1cc6825c09c847a5 # v7.1.1
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          files: ${{ steps.python-tests.outputs.files }}
          flags: python-${{ matrix.label || matrix.python-version }}
          fail_ci_if_error: false

  validate:
    name: Validate repository job
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:

      - name: Checkout code step
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      # A local composite action resolves at step time from the workspace, which is what makes this fallback expressible at all.
      # It runs the caller's own hook when it carries one, else the hub's no-op default.
      - name: Run repository validate hook step
        if: hashFiles('.github/actions/validate/action.yml') != ''
        uses: ./.github/actions/validate

      - name: Run default validate hook step
        if: hashFiles('.github/actions/validate/action.yml') == ''
        uses: $/.github/actions/validate-default