CI/CD input examples

CI/CD inputs increase the flexibility of your CI/CD configuration. Use these examples as guidelines for configuring your pipeline to use inputs.

Include the same file multiple times

You can include the same file multiple times, with different inputs. However, if multiple jobs with the same name are added to one pipeline, each additional job overwrites the previous job with the same name. You must ensure the configuration prevents duplicate job names.

For example, including the same configuration multiple times with different inputs:

include:
  - local: path/to/my-super-linter.yml
    inputs:
      linter: docs
      lint-path: "doc/"
  - local: path/to/my-super-linter.yml
    inputs:
      linter: yaml
      lint-path: "data/yaml/"

The configuration in path/to/my-super-linter.yml ensures the job has a unique name each time it is included:

spec:
  inputs:
    linter:
    lint-path:
---
"run-$[[ inputs.linter ]]-lint":
  script: ./lint --$[[ inputs.linter ]] --path=$[[ inputs.lint-path ]]

Reuse configuration in inputs

To reuse configuration with inputs, you can use YAML anchors.

For example, to reuse the same rules configuration with multiple components that support rules arrays in the inputs:

.my-job-rules: &my-job-rules
  - if: $CI_PIPELINE_SOURCE == "merge_request_event"
  - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH

include:
  - component: $CI_SERVER_FQDN/project/path/component1@main
    inputs:
      job-rules: *my-job-rules
  - component: $CI_SERVER_FQDN/project/path/component2@main
    inputs:
      job-rules: *my-job-rules

You cannot use !reference tags in inputs, but issue 424481 proposes adding this functionality.

Use inputs with needs

You can use array type inputs with needs for complex job dependencies.

For example, in a file named component.yml:

spec:
  inputs:
    first_needs:
      type: array
    second_needs:
      type: array
---

test_job:
  script: echo "this job has needs"
  needs:
    - $[[ inputs.first_needs ]]
    - $[[ inputs.second_needs ]]

In this example, the inputs are first_needs and second_needs, both array type inputs. Then, in a .gitlab-ci.yml file, you can add this configuration and set the input values:

include:
  - local: 'component.yml'
    inputs:
      first_needs:
        - build1
      second_needs:
        - build2

When the pipeline starts, the items in the needs array for test_job get concatenated into:

test_job:
  script: echo "this job has needs"
  needs:
  - build1
  - build2

Allow needs to be expanded when included

You can have needs in an included job, but also add additional jobs to the needs array with spec:inputs.

For example:

spec:
  inputs:
    test_job_needs:
      type: array
      default: []
---

build-job:
  script:
    - echo "My build job"

test-job:
  script:
    - echo "My test job"
  needs:
    - build-job
    - $[[ inputs.test_job_needs ]]

In this example:

• test-job job always needs build-job.
• By default the test job doesn’t need any other jobs, as the test_job_needs: array input is empty by default.

To set test-job to need another job in your configuration, add it to the test_needs input when you include the file. For example:

include:
  - component: $CI_SERVER_FQDN/project/path/component@1.0.0
    inputs:
      test_job_needs: [my-other-job]

my-other-job:
  script:
    - echo "I want build-job` in the component to need this job too"

Add needs to an included job that doesn’t have needs

You can add needs to an included job that does not have needs already defined. For example, in a CI/CD component’s configuration:

spec:
  inputs:
    test_job:
      default: test-job
---

build-job:
  script:
    - echo "My build job"

"$[[ inputs.test_job ]]":
  script:
    - echo "My test job"

In this example, the spec:inputs section allows the job name to be customized.

Then, after you include the component, you can extend the job with the additional needs configuration. For example:

include:
  - component: $CI_SERVER_FQDN/project/path/component@1.0.0
    inputs:
      test_job: my-test-job

my-test-job:
  needs: [my-other-job]

my-other-job:
  script:
    - echo "I want `my-test-job` to need this job"

Use inputs with include for more dynamic pipelines

You can use inputs with include to select which additional pipeline configuration files to include.

For example:

spec:
  inputs:
    pipeline-type:
      type: string
      default: development
      options: ['development', 'canary', 'production']
      description: "The pipeline type, which determines which set of jobs to include."
---

include:
  - local: .gitlab/ci/$[[ inputs.pipeline-type ]].gitlab-ci.yml

In this example, the .gitlab/ci/development.gitlab-ci.yml file is included by default. But if a different pipeline-type input option is used, a different configuration file is included.

Use CI/CD inputs in variable expressions

You can use CI/CD inputs to customize variable expressions. For example:

example-job:
  script: echo "Testing"
  rules:
    - if: '"$[[ inputs.some_example ]]" == "test-branch"'

The expression is evaluated in two steps:

1. Input interpolation: Before the pipeline is created, inputs are replaced with the input value. In this example, the $[[ inputs.some_example ]] input is replaced with the set value. For example, if the value is:

   • test-branch, the expression becomes if: '"test-branch" == "test-branch"'.
   • $CI_COMMIT_BRANCH, the expression becomes if: '"$CI_COMMIT_BRANCH" == "test-branch"'.

2. Expression evaluation: After the inputs are interpolated, GitLab attempts to create the pipeline. During pipeline creation, the expressions are evaluated to determine which jobs to add to the pipeline.