feat: add dockerfile linting

code-style/action.yml

@@ -5,7 +5,15 @@ description: >
   This action evaluates the code quality of your project by using `pre-commit
   <https://github.com/pre-commit/pre-commit/>`_. The action installs and runs
   ``pre-commit``. It is assumed that your project contains a
-  ``.pre-commit-config.yaml`` file in the root directory.
+  ``.pre-commit-config.yaml`` file in the root directory. The action can also
+  be extended to lint docker files that are contained in docker and
+  .devcontainer.
+
+    .. warning::
+
+      If docker lint is enabled and directories docker or .devcontainer exist,
+      the action will fail if it doesn't find a Dockerfile.
+
 
 inputs:
 
@@ -27,6 +35,29 @@ inputs:
     default: true
     type: boolean
 
+  docker-lint:
+    description: >
+      Extend the workflow to lint Dockerfile(s).
+    required: false
+    default: false
+    type: bool
+
+  docker-recursive:
+    description: >
+      Search for Dockerfile(s) recursively. Only applies to allowed
+      directories, i.e. docker and .devcontainer.
+    required: false
+    default: false
+    type: bool
+
+  docker-error-level:
+    description: >
+      Fail docker-style action based on hadolint output (-1: never, 0: error,
+      1: warning, 2: info)
+    required: false
+    default: 2
+    type: int
+
 runs:
   using: "composite"
   steps:
@@ -49,3 +80,31 @@ runs:
     - name: "Run pre-commit"
       shell: bash
       run: pre-commit run --all-files --show-diff-on-failure
+
+    # ------------------------------------------------------------------------
+
+    # Trigger docker-style action if docker-lint is set to true.
+    - uses: ansys/actions/_logging@main
+      if: ${{ inputs.docker-lint == 'true' }}
+      with:
+        level: "INFO"
+        message: >
+          Extend the workflow to lint Dockerfile(s).
+
+    - name: "Run Dockerfile linting in directories 'docker' and '.devcontainer'"
+      if: ${{ inputs.docker-lint == 'true' }}
+      uses: ansys/actions/docker-style@main
+      with:
+        directory: "docker .devcontainer"
+        recursive: ${{ inputs.docker-recursive }}
+        error-level: ${{ inputs.docker-error-level }}
+
+    # ------------------------------------------------------------------------
+
+    # End action as docker-lint is set to false.
+    - uses: ansys/actions/_logging@main
+      if: ${{ inputs.docker-lint == 'false' }}
+      with:
+        level: "INFO"
+        message: >
+          Docker lint disabled.

doc/source/style-actions/examples/docker-style-basic.yml

@@ -0,0 +1,10 @@
+docker-style:
+  name: "Docker style"
+  runs-on: ubuntu-latest
+  steps:
+    - name: "Run PyAnsys docker style checks"
+      uses: ansys/actions/docker-style@{{ version }}
+      with:
+        directory: docker
+        recursive: true
+        error-level: 1

doc/source/style-actions/index.rst

@@ -46,6 +46,27 @@ Doc style action
     {% endfor %}
 
 
+Docker style action
+-------------------
+.. jinja:: docker-style
+
+    {{ description }}
+
+    {{ inputs_table }}
+
+    Examples
+    ++++++++
+
+    {% for filename, title in examples %}
+    .. dropdown:: {{ title }}
+       :animate: fade-in
+
+       .. literalinclude:: examples/{{ filename }}
+          :language: yaml
+
+    {% endfor %}
+
+
 Commit style action
 -------------------
 

docker-style/action.yml

@@ -0,0 +1,157 @@
+name: >
+  Lint Dockerfile
+
+description: >
+  Evaluate the quality of your project Dockerfile(s) by using `hadolint
+  <https://github.com/hadolint/hadolint/>`_. This action can be used to
+  lint Dockerfile(s) from multiple directories, see input "directory"
+  description. The action uses `hadolint-gh-action
+  <https://github.com/jbergstroem/hadolint-gh-action>`_ behind the scenes.
+  If you want to evaluate multiple Dockerfiles contained in various
+  directories of the provided directory, use the recursive option.
+  When linting a Dockerfile dedicated to Windows, one should use hadolint
+  shell pragma to avoid false positives from ShellCheck, see `hadolint shell pragma
+  <https://github.com/hadolint/hadolint/pull/708>`_.
+
+  .. note::
+
+      This action emphasizes the fact of having Dockerfile(s) contained inside the
+      'docker' directory in the root of the project.
+
+  .. warning::
+
+      This action only looks for docker files named Dockerfile.
+      A docker file like Dockerfile.linux will not be linted.
+
+inputs:
+
+  # Optional inputs
+
+  directory:
+    description: >
+      Directory from which to search for Dockerfile(s). You can pass multiple
+      directories for processing by separating them with spaces, e.g.
+      "docker .devcontainer".
+    required: false
+    default: docker
+    type: string
+
+  recursive:
+    description: >
+      Search for Dockerfile(s) recursively.
+    required: false
+    default: false
+    type: bool
+
+  error-level:
+    description: >
+      Fail action based on hadolint output (-1: never, 0: error, 1: warning,
+      2: info)
+    required: false
+    default: 2
+    type: int
+
+runs:
+  using: "composite"
+  steps:
+
+    # ------------------------------------------------------------------------
+
+    - uses: ansys/actions/_logging@main
+      with:
+        level: "INFO"
+        message: >
+          Check that directory 'docker' exists at the root of the repository.
+          If it does not, then a warning is emitted.
+
+    - name: "Check if docker directory exists"
+      shell: bash
+      run: |
+        if [ -d "${{ github.workspace }}/docker" ]; then
+          echo "HAS_DOCKER_DIR=true" >> $GITHUB_ENV
+        else
+          echo "HAS_DOCKER_DIR=false" >> $GITHUB_ENV
+        fi
+
+    # ------------------------------------------------------------------------
+
+    - uses: ansys/actions/_logging@main
+      if: env.HAS_DOCKER_DIR == 'false'
+      with:
+        level: "WARNING"
+        message: >
+          No 'docker' directory found. If possible, please follow the common
+          approach of storing docker files in the 'docker' directory at the
+          root of the repository.
+
+    # ------------------------------------------------------------------------
+
+    - uses: ansys/actions/_logging@main
+      with:
+        level: "INFO"
+        message: >
+          Check that directory input exist. If not, a warning is raised and
+          non existing ones (if any) are ignored.
+
+    - name: "Filter input directory"
+      shell: bash
+      run: |
+        EXISTING_DIRS=""
+        NON_EXISTING_DIRS=""
+        for directory in ${{ inputs.directory }}
+        do
+          if [ -d "${{ github.workspace }}/$directory" ]; then
+            EXISTING_DIRS+="$directory "
+          else
+            NON_EXISTING_DIRS+="$directory "
+          fi
+        done
+        EXISTING_DIRS=$(echo -n "$EXISTING_DIRS" | xargs)
+        echo "EXISTING_DIRS=$EXISTING_DIRS" >> $GITHUB_ENV
+        NON_EXISTING_DIRS=$(echo -n "$NON_EXISTING_DIRS" | xargs)
+        echo "NON_EXISTING_DIRS=$NON_EXISTING_DIRS" >> $GITHUB_ENV
+
+    # ------------------------------------------------------------------------
+
+    - uses: ansys/actions/_logging@main
+      if: ${{ !!env.EXISTING_DIRS }}
+      with:
+        level: "INFO"
+        message: >
+          Lint '${{ env.EXISTING_DIRS }}'.
+
+    - name: "Format Hadolint dockerfile input"
+      if: ${{ !!env.EXISTING_DIRS }}
+      shell: bash
+      run: |
+        fmt_directory="${{ env.EXISTING_DIRS }}"
+        pattern="${{ inputs.recursive == 'true' && '/**' || '' }}/Dockerfile"
+        fmt_directory_array=($fmt_directory)
+        for i in "${!fmt_directory_array[@]}"; do
+          fmt_directory_array[i]="${fmt_directory_array[i]}${pattern}"
+        done
+        fmt_directory="${fmt_directory_array[*]}"
+        echo "FORMATED_HADOLINT_DOCKERFILE_INPUT=$fmt_directory" >> $GITHUB_ENV
+
+    - name: "Run Hadolint"
+      if: ${{ !!env.EXISTING_DIRS }}
+      uses: jbergstroem/hadolint-gh-action@v1
+      with:
+        dockerfile: ${{ env.FORMATED_HADOLINT_DOCKERFILE_INPUT }}
+        error_level: ${{ inputs.error-level }}
+
+    # ------------------------------------------------------------------------
+
+    - uses: ansys/actions/_logging@main
+      if: ${{ env.NON_EXISTING_DIRS != '' && contains(env.NON_EXISTING_DIRS, ' ') }}
+      with:
+        level: "WARNING"
+        message: >
+          Non existing directories: '${{ env.NON_EXISTING_DIRS }}'
+
+    - uses: ansys/actions/_logging@main
+      if: ${{ env.NON_EXISTING_DIRS != '' && !contains(env.NON_EXISTING_DIRS, ' ') }}
+      with:
+        level: "WARNING"
+        message: >
+          Non existing directory: '${{ env.NON_EXISTING_DIRS }}'