Add basic Helm jobs

This adds a simple job which runs the `chart-testing` linter against
a repository.

Change-Id: I974c64343e88c235a6dc887d5378f7db2ee3b1fc

doc/source/helm-jobs.rst

@@ -0,0 +1,4 @@
+Helm Jobs
+=========
+
+.. zuul:autojob:: chart-testing-lint

doc/source/helm-roles.rst

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+Helm Roles
+==========
+
+.. zuul:autorole:: ensure-helm
+.. zuul:autorole:: ensure-chart-testing

doc/source/jobs.rst

@@ -9,3 +9,4 @@ Jobs
    js-jobs
    docker-jobs
    go-jobs
+   helm-jobs

doc/source/roles.rst

@@ -17,3 +17,4 @@ Roles
    puppet-roles
    python-roles
    translation-roles
+   helm-roles

playbooks/chart-testing/pre.yaml

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+---
+- hosts: all
+  roles:
+  - ensure-helm
+  - ensure-chart-testing

playbooks/chart-testing/run.yaml

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+---
+- hosts: all
+  tasks:
+  - name: Run linters
+    # NOTE(mnaser): We use --validate-maintainers=false because chart-testing
+    #               relies on the existance of a remote URL which is /dev/null
+    #               in Zuul and fails.
+    command: ct lint --validate-maintainers=false
+    args:
+      chdir: "{{ zuul.project.src_dir }}"

roles/ensure-chart-testing/README.rst

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+Ensure chart-testing is installed
+
+**Role Variables**
+
+.. zuul:rolevar:: chart_testing_version
+
+   Version of chart-testing to install

roles/ensure-chart-testing/defaults/main.yaml

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+---
+chart_testing_version: 2.4.0

roles/ensure-chart-testing/tasks/main.yaml

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+---
+- name: Install Python dependencies
+  become: true
+  pip:
+    name:
+    - yamale==1.8.0
+    - yamllint==1.13.0
+
+- name: Install chart-testing
+  become: true
+  unarchive:
+    remote_src: true
+    src: "https://github.com/helm/chart-testing/releases/download/v{{ chart_testing_version }}/chart-testing_{{ chart_testing_version }}_linux_amd64.tar.gz"
+    dest: /usr/local/bin
+
+- name: Setup /etc/ct
+  become: true
+  file:
+    path: /etc/ct
+    state: directory
+
+- name: Install configuration files
+  become: true
+  get_url:
+    url: "https://raw.githubusercontent.com/helm/chart-testing/v{{ chart_testing_version }}/etc/{{ item }}"
+    dest: "/etc/ct/{{ item }}"
+  loop:
+  - chart_schema.yaml
+  - lintconf.yaml

roles/ensure-helm/README.rst

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+Ensure Helm is installed
+
+**Role Variables**
+
+.. zuul:rolevar:: helm_version
+
+   Version of Helm to install

roles/ensure-helm/defaults/main.yaml

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+---
+helm_version: 2.16.1

roles/ensure-helm/tasks/main.yaml

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+---
+- name: Download Helm
+  unarchive:
+    remote_src: true
+    src: "https://get.helm.sh/helm-v{{ helm_version }}-linux-amd64.tar.gz"
+    dest: /tmp
+
+- name: Install Helm
+  become: true
+  copy:
+    remote_src: true
+    src: /tmp/linux-amd64/helm
+    dest: /usr/local/bin/helm
+    mode: '0755'
+
+- name: Initialize Helm
+  shell: helm init --client-only
+  tags:
+    # NOTE(mnaser): The `helm` module does not support running init only.
+    - skip_ansible_lint

zuul.d/helm-jobs.yaml

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+- job:
+    name: chart-testing-lint
+    description: |
+      Run chart-testing on Helm charts
+    pre-run: playbooks/chart-testing/pre.yaml
+    run: playbooks/chart-testing/run.yaml