• Define input parameters with spec:inputs
  • Define inputs with multiple parameters
• Set input values when using include
  • Use include:inputs with multiple files
  • Include the same file multiple times
• Specify functions to manipulate input values
  • Predefined interpolation functions
    • expand_vars
    • truncate

Define inputs for configuration added with include

Use inputs to increase the flexibility of CI/CD configuration files that are designed to be reused.

Inputs can use CI/CD variables, but have the same variable limitations as the include keyword.

Define input parameters with spec:inputs

Use spec:inputs to define input parameters for CI/CD configuration intended to be added to a pipeline with include. Use include:inputs to pass input values when building the configuration for a pipeline.

The specs must be declared at the top of the configuration file, in a header section. Separate the header from the rest of the configuration with ---.

Use the interpolation format $[[ inputs.input-id ]] outside the header section to replace the values. The inputs are evaluated and interpolated when the configuration is fetched during pipeline creation, but before the configuration is merged with the contents of the .gitlab-ci.yml file.

For example, in a file named custom_website_scan.yml:

spec:
  inputs:
    job-stage:
    environment:
---

scan-website:
  stage: $[[ inputs.job-stage ]]
  script: ./scan-website $[[ inputs.environment ]]

When using spec:inputs:

• Inputs are mandatory by default.
• Validation errors are returned if:
  • A string containing an interpolation block exceeds 1 MB.
  • The string inside an interpolation block exceeds 1 KB.

Additionally, use:

• spec:inputs:default to define default values for inputs when not specified. When you specify a default, the inputs are no longer mandatory.
• spec:inputs:description to give a description to a specific input. The description does not affect the input, but can help people understand the input details or expected values.
• spec:inputs:options to specify a list of allowed values for an input.
• spec:inputs:regex to specify a regular expression that the input must match.
• spec:inputs:type to force a specific input type, which can be string (default when not specified), number, or boolean.

Define inputs with multiple parameters

You can define multiple inputs per CI/CD configuration file, and each input can have multiple configuration parameters.

For example, in a file named scan-website-job.yml:

spec:
  inputs:
    job-prefix:     # Mandatory string input
      description: "Define a prefix for the job name"
    job-stage:      # Optional string input with a default value when not provided
      default: test
    environment:    # Mandatory input that must match one of the options
      options: ['test', 'staging', 'production']
    concurrency:
      type: number  # Optional numeric input with a default value when not provided
      default: 1
    version:        # Mandatory string input that must match the regular expression
      type: string
      regex: /^v\d\.\d+(\.\d+)$/
    export_results: # Optional boolean input with a default value when not provided
      type: boolean
      default: true
---

"$[[ job-prefix ]]-scan-website":
  stage: $[[ inputs.job-stage ]]
  script:
    - echo "scanning website -e $[[ inputs.environment ]] -c $[[ inputs.concurrency ]] -v $[[ inputs.version ]]"
    - if [ $[[ inputs.export_results ]] ]; then echo "export results"; fi

In this example:

• job-prefix is a mandatory string input and must be defined.
• job-stage is optional. If not defined, the value is test.
• environment is a mandatory string input that must match one of the defined options.
• concurrency is an optional numeric input. When not specified, it defaults to 1.
• version is a mandatory string input that must match the specified regular expression.
• export_results is an optional boolean input. When not specified, it defaults to true.

Set input values when using include

Use include:inputs to set the values for the parameters when the included configuration is added to the pipeline.

For example, to include the scan-website-job.yml in the example above:

include:
  - local: 'scan-website-job.yml'
    inputs:
      job-prefix: 'some-service-'
      environment: 'staging'
      concurrency: 2
      version: 'v1.3.2'
      export_results: false

In this example, the inputs for the included configuration are:

Use include:inputs with multiple files

inputs must be specified separately for each included file. For example:

include:
  - component: gitlab.com/the-namespace/the-project/the-component@1.0
    inputs:
      stage: my-stage
  - local: path/to/file.yml
    inputs:
      stage: my-stage

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:
      type: docs
      lint-path: "doc/"
  - local: path/to/my-super-linter.yml
    inputs:
      type: 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:
    type:
    lint-path:
---
"run-$[[ inputs.type ]]-lint":
  script: ./lint --$[[ inputs.type ]] --path=$[[ inputs.lint-path ]]

Specify functions to manipulate input values

You can specify predefined functions in the interpolation block to manipulate the input value. The format supported is the following:

$[[ input.input-id | <function1> | <function2> | ... <functionN> ]]

Details:

• Only predefined interpolation functions are permitted.
• A maximum of 3 functions may be specified in a single interpolation block.
• The functions are executed in the sequence they are specified.

spec:
  inputs:
    test:
      default: 'test $MY_VAR'
---

test-job:
  script: echo $[[ inputs.test | expand_vars | truncate(5,8) ]]

In this example, assuming the input uses the default value and $MY_VAR is an unmasked project variable with value my value:

1. First, the function expand_vars expands the value to test my value.
2. Then truncate applies to test my value with a character offset of 5 and length 8.
3. The output of script would be echo my value.

Predefined interpolation functions

expand_vars

Use expand_vars to expand CI/CD variables in the input value.

Only variables you can use with the include keyword and which are not masked can be expanded. Nested variable expansion is not supported.

Example:

$[[ inputs.test | expand_vars ]]

Assuming the value of inputs.test is test $MY_VAR, and the variable $MY_VAR is unmasked with a value of my value, then the output would be test my value.

truncate

Use truncate to shorten the interpolated value. For example:

• truncate(<offset>,<length>)

Example:

$[[ inputs.test | truncate(3,5) ]]

Assuming the value of inputs.test is 0123456789, then the output would be 34567.