collectors

Define the collectors section of lunar-config.yml — scripts that run on CI, code, or cron triggers to gather component metadata.

• lunar-config.yml -> collectors

• Type: array

• Form:

  collectors:
    - <collector-object>
    - <collector-object>
    - ...

Collectors are used to collect live information from various sources to associate with individual components.

Example collectors definition:

lunar-config.yml

collectors:
  - uses: github://third-party/some-collector@v1
    on: [auth, frontend]
    hook:
      type: ci-before-command
      pattern: ^go build.*
  - uses: ./my-collector
    on: ["domain:my-domain"]
    hook:
      type: ci-before-job
      pattern: .*
  - uses: ./my-collector
    on: ["domain:foo-product"]
    hook:
      type: code
  - uses: ./another-collector
    on: [go]
    hook:
      type: cron
      schedule: "0 2 * * *"
  - name: Hello world collector
    runBash: lunar collect '.hello' world
    on: [java]
    hook: 
      type: ci-after-command
      pattern: ^mvn install.*
  - name: Example script collector
    mainBash: ./my-script.sh
    on: [python]
    hook:
      type: cron
      schedule: "0 2 * * *"

Collector

• lunar-config.yml -> collectors.<collector-index>

• Type: object

• Forms

  • Uses form (use an external collector plugin):

    name: <collector-name>
    description: <description>
    uses: <collector-string>
    include: <include-array>
    exclude: <exclude-array>
    with:
      <input-name>: <input-value>
      ...
    on: <domain-array>
    runs_on: <runs-on-array>
    image: <docker-image>

  • Run form (define a collector inline):

    name: <collector-name>
    description: <description>
    run<language>: <command-string>
    on: <domain-array>
    runs_on: <runs-on-array>
    image: <docker-image>
    hook: <hook-configuration>
    hooks:
      - <hook-configuration>
      - <hook-configuration>
      - ...

  • Main form (define a collector inline with a main file):

    name: <collector-name>
    description: <description>
    main<language>: <main-file-path>
    on: <domain-array>
    runs_on: <runs-on-array>
    image: <docker-image>
    hook: <hook-configuration>
    hooks:
      - <hook-configuration>
      - <hook-configuration>
      - ...

Collectors are used to collect live information from various sources to associate with individual components. Collectors can be used to instrument CI/CD pipelines, run cron jobs, or execute arbitrary logic when code changes.

Collectors can either be imported (Uses form), defined as an inline command (Run form), or defined as a script to run (Main form). When a collector is defined inline (Run and Main forms), a hook must be specified to determine when the collector should run.

name

• lunar-config.yml -> collectors.<collector-index>.name

• Type: string

• Required for Run and Main collector forms, Optional for Uses collector form

The name field is used to specify the name of the collector. If a name is not provided in the case of a collector plugin, the name from the collector plugin is used. The name must be unique within the configuration.

description

• lunar-config.yml -> collectors.<collector-index>.description

• Type: string

• Optional

A description of the collector. This is used to describe the purpose of the collector in the Lunar UI and logs.

uses

• lunar-config.yml -> collectors.<collector-index>.uses

• Type: string

• Forms

  • GitHub form: github://<org>/<repo>@<version>

  • Local form: ./<path-to-collector>

• Required in Uses collector form

The uses field specifies an external (plugin) collector to use. The collector can be a third-party collector, or a local collector defined in a subdirectory. Browse the 30+ available integrations to find collectors for your tools.

with

• lunar-config.yml -> collectors.<collector-index>.with

• Type: object

• Optional

The with field specifies the inputs to pass to the collector plugin. The inputs are defined in the collector's configuration file. Input values are available to collector scripts as LUNAR_VAR_* environment variables.

Plugin authors can also reference inputs in their plugin YAML definitions using the ${{ inputs.NAME }} syntax. This allows plugins to expose configurable fields -- such as hook parameters -- as explicit settings. See collector plugins for details.

include

• lunar-config.yml -> collectors.<collector-index>.include

• Type: array

• Optional

The include field specifies which subcollectors to include from an imported collector plugin. When a collector is imported via uses, it may define (or import) multiple subcollectors. Use include to control which of those subcollectors are used.

If neither include nor exclude is specified, all subcollectors are included by default.

exclude

• lunar-config.yml -> collectors.<collector-index>.exclude

• Type: array

• Optional

The exclude field specifies which subcollectors to exclude from an imported collector plugin. Use exclude when you want to include most subcollectors but skip a few specific ones.

If neither include nor exclude is specified, all subcollectors are included by default.

For example, if a collector called go includes subcollectors named version, dependencies, and build-info:

lunar-config.yml

collectors:
  # Include only the version subcollector
  - uses: ./dir/go
    include: [version]

  # Include all except version
  - uses: ./dir/go
    exclude: [version]

  # Include version and dependencies only
  - uses: ./dir/go
    include: [version, dependencies]

run<language>

• lunar-config.yml -> collectors.<collector-index>.run<language>

• Type: string

• Required in Run collector form

Defines the command to execute when the collector is invoked. Only Bash and Python are supported. So runBash and runPython are the only valid fields.

Running Bash supports installing dependencies.

runBash

• lunar-config.yml -> collectors.<collector-index>.runBash

• Type: string

The runBash field specifies the bash collector script to run.

runPython

• lunar-config.yml -> collectors.<collector-index>.runPython

• Type: string

The runPython field specifies the python collector script to run. Running Python supports installing dependencies.

main<language>

• lunar-config.yml -> collectors.<collector-index>.main<language>

• Type: string

• Required in Main collector form

Defines the main file path used to execute when the collector is invoked. Only Bash and Python are supported. So mainBash and mainPython are the only valid fields.

The file path is relative to the root of the Lunar configuration repository. In the case of an external plugin definition, the path is relative to the plugin directory.

Running Bash supports installing dependencies.

mainBash

• lunar-config.yml -> collectors.<collector-index>.mainBash

• Type: string

The mainBash field specifies the path to the bash main file to run.

mainPython

• lunar-config.yml -> collectors.<collector-index>.mainPython

• Type: string

The mainPython field specifies the path to the python main file to run. Running Python supports installing dependencies.

on

• lunar-config.yml -> collectors.<collector-index>.on

• Type: array

• Required

The on field specifies the tags that the collector should be associated with. The collector will only run when the component has one or more of the specified tags.

For detailed documentation on tag matching syntax, including domain/component targeting, expressions, and cross-references to other collectors or policies, see Tag Matching with on.

runs_on

• lunar-config.yml -> collectors.<collector-index>.runs_on

• Type: array

• Optional

• Default: [prs, default-branch]

Specifies the contexts in which the collector should run. The available values are:

• prs - the collector will run on pull requests

• default-branch - the collector will run on the default branch

By default, collectors run in both contexts. To restrict a collector to only run on pull requests, use runs_on: [prs]. To restrict a collector to only run on the default branch, use runs_on: [default-branch].

hook

• lunar-config.yml -> collectors.<collector-index>.hook

• Type: object

• One of hook or hooks is required in Run collector form

Using hook is equivalent to using a single hook in the hooks field. The hook field specifies when the collector should run.

For more information about hook definitions see the hooks configuration page.

hooks

• lunar-config.yml -> collectors.<collector-index>.hooks

• Type: array

• One of hook or hooks is required in Run collector form

The hooks field specifies when the collector should run.

For more information about hook definitions see the hooks configuration page.

image

• lunar-config.yml -> collectors.<collector-index>.image

• Type: string

• Optional

The image field specifies the Docker image to use when running the collector. When set, the collector runs inside a container instead of natively on the host.

Use the special value native to explicitly run the collector without a container, even when a default image has been configured.

Example:

lunar-config.yml

collectors:
  # Run in a container
  - runBash: lunar collect .file-count "$(find . | wc -l)"
    image: earthly/lunar-scripts:1.0.0
    hook:
      type: code
    on: [my-tag]

  # Run natively (override any default image)
  - runBash: lunar collect .ci-info "$CI_JOB_ID"
    image: native
    hook:
      type: ci-before-command
      pattern: ^.*
    on: [my-tag]

For more information about default images and container execution, see Images.