• Validate sample CI/CD configuration
• Validate a project’s CI/CD configuration
• Use jq to create and process YAML & JSON payloads
  • Escape YAML for JSON encoding
  • Parse a CI Lint response

CI Lint API

Validate sample CI/CD configuration

Checks if a sample CI/CD YAML configuration is valid. This endpoint validates the CI/CD configuration in the context of the project, including:

• Using the project’s CI/CD variables.
• Searching the project’s files for include:local entries.

POST /projects/:id/ci/lint

Example request:

curl --header "Content-Type: application/json" "https://gitlab.example.com/api/v4/projects/:id/ci/lint" --data '{"content": "{ \"image\": \"ruby:2.6\", \"services\": [\"postgres\"], \"before_script\": [\"bundle install\", \"bundle exec rake db:create\"], \"variables\": {\"DB_NAME\": \"postgres\"}, \"stages\": [\"test\", \"deploy\", \"notify\"], \"rspec\": { \"script\": \"rake spec\", \"tags\": [\"ruby\", \"postgres\"], \"only\": [\"branches\"]}}"}'

Example responses:

• Valid configuration:

  {
    "valid": true,
    "merged_yaml": "---\ntest_job:\n  script: echo 1\n",
    "errors": [],
    "warnings": []
  }
  

• Invalid configuration:

  {
    "valid": false,
    "merged_yaml": "---\ntest_job:\n  script: echo 1\n",
    "errors": [
      "jobs config should contain at least one visible job"
    ],
    "warnings": []
  }
  

Validate a project’s CI/CD configuration

Checks if a project’s .gitlab-ci.yml configuration in a given ref (the content_ref parameter, by default HEAD of the project’s default branch) is valid. This endpoint validates the CI/CD configuration, including:

• Using the project’s CI/CD variables.
• Searching the project’s files for include:local entries.

GET /projects/:id/ci/lint

Example request:

curl "https://gitlab.example.com/api/v4/projects/:id/ci/lint"

Example responses:

• Valid configuration:

{
  "valid": true,
  "merged_yaml": "---\ntest_job:\n  script: echo 1\n",
  "errors": [],
  "warnings": []
}

• Invalid configuration:

{
  "valid": false,
  "merged_yaml": "---\ntest_job:\n  script: echo 1\n",
  "errors": [
    "jobs config should contain at least one visible job"
  ],
  "warnings": []
}

Use jq to create and process YAML & JSON payloads

To POST a YAML configuration to the CI Lint endpoint, it must be properly escaped and JSON encoded. You can use jq and curl to escape and upload YAML to the GitLab API.

Escape YAML for JSON encoding

To escape quotes and encode your YAML in a format suitable for embedding within a JSON payload, you can use jq. For example, create a file named example-gitlab-ci.yml:

.api_test:
  rules:
    - if: $CI_PIPELINE_SOURCE=="merge_request_event"
      changes:
        - src/api/*
deploy:
  extends:
    - .api_test
  rules:
    - when: manual
      allow_failure: true
  script:
    - echo "hello world"

Next, use jq to escape and encode the YAML file into JSON:

jq --raw-input --slurp < example-gitlab-ci.yml

To escape and encode an input YAML file (example-gitlab-ci.yml), and POST it to the GitLab API using curl and jq in a one-line command:

jq --null-input --arg yaml "$(<example-gitlab-ci.yml)" '.content=$yaml' \
| curl "https://gitlab.com/api/v4/projects/:id/ci/lint?include_merged_yaml=true" \
--header 'Content-Type: application/json' \
--data @-

Parse a CI Lint response

To reformat the CI Lint response, you can use jq. You can pipe the CI Lint response to jq, or store the API response as a text file and provide it as an argument:

jq --raw-output '.merged_yaml | fromjson' <your_input_here>

Example input:

{"status":"valid","errors":[],"merged_yaml":"---\n.api_test:\n  rules:\n  - if: $CI_PIPELINE_SOURCE==\"merge_request_event\"\n    changes:\n    - src/api/*\ndeploy:\n  rules:\n  - when: manual\n    allow_failure: true\n  extends:\n  - \".api_test\"\n  script:\n  - echo \"hello world\"\n"}

Becomes:

.api_test:
  rules:
  - if: $CI_PIPELINE_SOURCE=="merge_request_event"
    changes:
    - src/api/*
deploy:
  rules:
  - when: manual
    allow_failure: true
  extends:
  - ".api_test"
  script:
  - echo "hello world"

With a one-line command, you can:

1. Escape the YAML
2. Encode it in JSON
3. POST it to the API with curl
4. Format the response

jq --null-input --arg yaml "$(<example-gitlab-ci.yml)" '.content=$yaml' \
| curl "https://gitlab.com/api/v4/projects/:id/ci/lint?include_merged_yaml=true" \
--header 'Content-Type: application/json' --data @- \
| jq --raw-output '.merged_yaml | fromjson'