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concourse-keyval-resource

a Concourse resource for:

  • passing arbitrary data between steps and/or jobs
  • curating dynamic filesystem content

Getting Started

resource_types:
  - name: keyval
    type: registry-image
    source:
      repository: ghcr.io/cludden/concourse-keyval-resource

resources:
  - name: keyval
    type: keyval
    icon: table
    expose_build_created_by: true

jobs:
  - name: first
    plan:
      - put: keyval
        params:
          mapping: |
            root = this.map_each_key(k -> k.replace_all("build_", ""))

  - name: second
    plan:
      - get: keyval
        trigger: true
        passed: [first]
        params:
          files:
            test.md: |
              root = """
              # Build Summary
              | ID | Team | Pipeline | Job | Name |
              | :---: | :--- | :--- | :--- | :--- |
              | [%s](%s) | %s | %s | %s | %s |
              """.format(id, url, team, pipeline, job, name)
            test.json: |
              uid = ksuid()
              id = id
              url = url

      - task: print
        config:
          platform: linux
          image_resource:
            type: registry-image
            source:
              repository: busybox
          inputs:
            - name: keyval
          run:
            path: /bin/sh
            args:
              - -c
              - |
                ls -lh ./keyval
                echo "keyval/version.json:"
                cat keyval/version.json
                echo "keyval/metadata.json:"
                cat keyval/metadata.json
                echo "keyval/test.md:"
                cat keyval/test.md
                echo "keyval/test.json:"
                cat keyval/test.json

Configuration

Parameters:

Parameter Type Description Required
archive *archive.Archive optional archive config that can be used to enable resource version archiving
initial_mapping string a Bloblang mapping that can be used to customize the initial version returned by this resource. See Initial Mapping for more details. ⚠

Behavior

check

Check returns the latest available version produced by a put step. If get is used prior to put, an initial version will be returned which can be customized via the initial_mapping resource parameter.

in

Fetches arbitrary key value data from a prior put step and writes it the file system as a JSON document.

Parameters:

Parameter Type Description Required
files map[string]string a map of filenames to Bloblang mappings, where the input document contains the build metadata along with any key value data from the fetched version, and the output is the content of the file to write (note: unless the file extension is one of .json, .yaml, or .yml, the mapping output must be of type string or []byte)

Files:

  • version.json - the key value pairs serialized as a JSON document
  • metadata.json - the build metadata serialized as a JSON document
  • * any file mappings defined in the files parameter

out

Publishes arbitrary key value data to be shared across jobs.

Parameters:

Parameter Type Description Required
mapping string a Bloblang mappings, where the input document contains the build metadata, and the output is a map[string]string, defaults to root = this

Build Metadata

Each Bloblang mappings the following build metadata as input:

Parameter Type Description Always Available
build_created_by string the username that created the build, only available when the resource is configured to expose_build_created_by
build_id string the unique build identifier ✓
build_instance_vars string instance vars of the instanced pipeline that the build's job lives in, serialized as JSON
build_job string the name of the job ✓
build_name string the build id in the context of the pipeline ✓
build_pipeline string the name of the pipeline ✓
build_team string the name of the team ✓
build_url string the fully qualified build url ✓

Initial Mapping

In most sitautions, like the example below, the initial use of this resource is with a put step, followed by a later get step, in which case this field is not required and checking should be disabled via check_every: never to conserve resources.

resource_types:
  - name: keyval
    type: registry-image
    source:
      repository: ghcr.io/cludden/concourse-keyval-resource

resources:
  - name: keyval
    type: keyval
    icon: table
    check_every: never
    expose_build_created_by: true

jobs:
  - name: first
    plan:
      - put: keyval
        params:
          mapping: |
            timestamp = now()
  
  - name: second
    plan:
      - get: keyval
        passed: [first]
        trigger: true

In others, this resource may be initially used with a get step (e.g. importing data from a previous build of the same job), in which case this field is required and check_every should be set to some value other than never in order to allow for Concourse to implicitly run a check when attempting to satisfy inputs for the initial build.

resource_types:
  - name: keyval
    type: registry-image
    source:
      repository: ghcr.io/cludden/concourse-keyval-resource

resources:
  - name: keyval
    type: keyval
    icon: table
    check_every: 24h
    expose_build_created_by: true
    source:
      initial_mapping: |
        count = "0"

jobs:
  - name: first
    plan:
      - get: previous
        resource: keyval

      - load_var: data
        file: previous/version.json
        reveal: true

      - put: keyval
        params:
          mapping: |
            count = (((.:data.count)) + 1).string()

License

Licensed under the MIT License
Copyright (c) 2023 Chris Ludden