Conditions

Conditions limit pipeline step execution at runtime. Harness Open Source sets variables that can be used in conditions.

Harness Open Source supports multiple pipelines per repository. Creating a pipeline per trigger (push, pull request, tag) can reduce the need for conditions.

The following operators are supported:

Type	Operator
Comparison	==, !=
Logical	not, and, or
Regex	matches
String	contains, startsWith, endsWith

The following functions are supported:

Type	Syntax
Always	always()
Failure	failure()

This pipeline runs the test step only for pull request events where the target branch is main.

kind: pipeline
spec:
  stages:
  - type: ci
    spec:
      steps:
      - name: test
        type: run
        when: |
          build.event == "pull_request"
          and
          build.target == "main"
        spec:
          container: ruby
          script: |-
            bundle install --jobs=3 --retry=3
            rake

This condition runs the step for pull request events where the target branch is not main.

        when: |
          build.event == "pull_request"
          and
          build.target != "main"

This condition runs the step only when a pull request is created based on the action.

        when: build.action == "pullreq_created"

Branch

Limit execution based on the target branch.

This pipeline runs the build step when the target branch is main, or starts with feature/.

kind: pipeline
spec:
  stages:
  - type: ci
    spec:
      steps:
      - name: build
        type: run
        when: |
          build.target == "main"
          or
          build.target startsWith "feature/"
        spec:
          container: golang
          script: |-
            go build
            go test

This condition uses a regular expression to achieve the same behavior.

        when: build.target matches "main|feature/.*"

Event

Limit execution based on the event.

This pipeline runs the clean cache step only for manually triggered pipelines.

kind: pipeline
spec:
  stages:
  - type: ci
    spec:
      steps:
      - name: clean cache
        type: run
        when: build.event == "manual"
        spec:
          container: node:18
          script: |-
            npm cache clean --force

Reference

Limit execution based on the git reference.

This pipeline runs the build step for branch names that start with feature-, or for tags.

kind: pipeline
spec:
  stages:
  - type: ci
    spec:
      steps:
      - name: build
        type: run
        when: |
          build.ref startsWith "refs/heads/feature-"
          or
          build.ref startsWith "refs/tags/"
        spec:
          container: golang
          script: |-
            go build
            go test

Status

Limit execution based on the pipeline status.

This pipeline runs the notify step only when the test step fails.

kind: pipeline
spec:
  stages:
  - type: ci
    spec:
      steps:
      - name: test
        type: run
        spec:
          container: gradle:jdk10
          script: |-
            gradle assemble
            gradle check

      - name: notify
        type: plugin
        when: failure()
        spec:
          name: slack
          inputs:
            webhook: ${{ secrets.get("slack_webhook") }}

This condition will always run the step.

        when: always()