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Pipeline Parameters

Pipeline parameters are new with API v2. To use pipeline parameters you must use configuration version 2.1 or higher.

Declaring and using pipeline parameters in configuration

Pipeline parameters are declared using a parameters stanza in the top level keys of your .circleci/config.yml file. You can then reference the value of the parameter as a config variable in the scope pipeline.parameters.

The example belows shows a config with two pipeline parameters, image-tag and workingdir both used on the subsequent config stanzas:

version: 2.1
parameters:
  image-tag:
    type: string
    default: "latest"
  workingdir:
    type: string
    default: "~/main"

jobs:
  build:
    docker:
      - image: circleci/node:<< pipeline.parameters.image-tag >>
    environment:
      IMAGETAG: << pipeline.parameters.image-tag >>
    working_directory: << pipeline.parameters.workingdir >>
    steps:
      - run: echo "Image tag used was ${IMAGETAG}"
      - run: echo "$(pwd) == << pipeline.parameters.workingdir >>"

Passing parameters when triggering pipelines via the API

Use the API v2 endpoint to trigger a pipeline, passing the parameters key in the JSON packet in your POST body.

The example below triggers a pipeline with the parameters in the above config example (NOTE: To pass a parameter when triggering a pipeline via the API the parameter must be declared in the configuration file.).

curl -u ${CIRCLECI_TOKEN}: -X POST --header "Content-Type: application/json" -d '{
  "parameters": {
    "workingdir": "./myspecialdir",
    "image-tag": "4.8.2"
  }
}' https://circleci.com/api/v2/project/:vcs-type/:username/:project/pipeline

The scope of pipeline parameters

Pipeline parameters can only be resolved in the .circleci/config.yml file in which they are declared. Pipeline parameters are not available in orbs, including orbs declared locally in your config.yml file. We made this design decision because access to the pipeline scope in orbs would break encapsulation and create a hard dependency between the orb and the calling config, jeopardizing determinism and creating surface area of vulnerability.

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