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ProwJobs

For a brief overview of how Prow runs jobs take a look at "Life of a Prow Job".

How to configure new jobs

To configure a new job you'll need to add an entry into config.yaml. If you have update-config plugin deployed then the config will be automatically updated once the PR is merged, else you will need to run make update-config. This does not require redeploying any binaries, and will take effect within a minute.

Periodic config looks like so:

periodics:
- name: foo-job         # Names need not be unique, but must match the regex ^[A-Za-z0-9-._]+$
  decorate: true        # Enable Pod Utility decoration. (see below)
  interval: 1h          # Anything that can be parsed by time.ParseDuration.
  spec: {}              # Valid Kubernetes PodSpec.

Postsubmit config looks like so:

postsubmits:
  org/repo:
  - name: bar-job         # As for periodics.
    decorate: true        # As for periodics.
    spec: {}              # As for periodics.
    max_concurrency: 10   # Run no more than this number concurrently.
    branches:             # Regexps, only run against these branches.
    - ^master$
    skip_branches:        # Regexps, do not run against these branches.
    - ^release-.*$

Postsubmits are run when a push event happens on a repo, hence they are configured per-repo. If no branches are specified, then they will run against every branch.

Presubmit config looks like so:

presubmits:
  org/repo:
  - name: qux-job            # As for periodics.
    decorate: true           # As for periodics.
    always_run: true         # Run for every PR, or only when requested.
    run_if_changed: "qux/.*" # Regexp, only run on certain changed files.
    skip_report: true        # Whether to skip setting a status on GitHub.
    context: qux-job         # Status context. Defaults to the job name.
    max_concurrency: 10      # As for postsubmits.
    spec: {}                 # As for periodics.
    branches: []             # As for postsubmits.
    skip_branches: []        # As for postsubmits.
    trigger: "(?m)qux test this( please)?" # Regexp, see discussion.
    rerun_command: "qux test this please"  # String, see discussion.

If you only want to run tests when specific files are touched, you can use run_if_changed. A useful pattern when adding new jobs is to start with always_run set to false and skip_report set to true. Test it out a few times by manually triggering, then switch always_run to true. Watch for a couple days, then switch skip_report to false.

The trigger is a regexp that matches the rerun_command. Users will be told to input the rerun_command when they want to rerun the job. Actually, anything that matches trigger will suffice. This is useful if you want to make one command that reruns all jobs. If unspecified, the default configuration makes /test <job-name> trigger the job.

Standard Triggering and Execution Behavior for Jobs

When configuring jobs, it is necessary to keep in mind the set of rules Prow has for triggering jobs, the GitHub status contexts that those jobs provide, and the rules for protecting those contexts on branches.

Triggering Jobs

Trigger Types

prow will consider three different types of jobs that run on pull requests (presubmits):

  1. jobs that run unconditionally and automatically. All jobs that set always_run: true fall into this set.
  2. jobs that run conditionally, but automatically. All jobs that set run_if_changed to some value fall into this set.
  3. jobs that run conditionally, but not automatically. All jobs that set always_run: false and do not set run_if_changed to any value fall into this set and require a human to trigger them with a command.

By default, jobs fall into the third category and must have their always_run or run_if_changed configured to operate differently.

In the rest of this document, "a job running unconditionally" indicates that the job will run even if it is normally conditional and the conditions are not met. Similarly, "a job running conditionally" indicates that the job runs if all of its conditions are met.

Triggering Jobs With Comments

A developer may trigger jobs by posting a comment to a pull request that contains one or more of the following phrases:

  • /test job-name : When posting /test job-name, any jobs with matching triggers will be triggered unconditionally.
  • /retest : When posting /retest, two types of jobs will be triggered:
    • all jobs that have run and failed will run unconditionally
    • any not-yet-executed automatically run jobs will run conditionally
  • /test all : When posting /test all, all automatically run jobs will run conditionally.

Note: is is possible to configure a job's trigger to match any of the above keywords (/retest and/or /test all) but this behavior is not suggested as it will confuse developers that expect consistent behavior from these commands. More generally, it is possible to configure a job's trigger to match any command that is otherwise known to Prow in some other context, like /close. It is similarly not suggested to do this.

Posting GitHub Status Contexts

Jobs that run will always post a status context to the commit under test in GitHub. Jobs that run conditionally but do not match the content of the pull request will not post "Skipped" status contexts to the pull request.

If a conditional job matched a pull request at some point in the past, ran and failed it will post a failed status context to the pull request. If the conditional job still matches the pull request, a /retest or /test job-name will re-trigger it and potentially update the failed context to passing. If the job no longer matches the pull request, you may still re-trigger it with /test job-name, but if it is no longer relevant to the pull request, use the /skip command to dismiss the status context on GitHub.

Requiring Job Statuses

Requiring Jobs for Auto-Merge Through Tide

Tide will treat jobs in the following manner for merging:

  • unconditionally run jobs with required status contexts are always required to have passed on a pull request to merge
  • conditionally run jobs with required status contexts are required to have passed on a pull request to merge if they have been triggered against the pull request during its lifetime
  • jobs with optional status contexts are ignored when merging

In order to set a job's context to be optional, set optional: true on the job. If it is required to not post the results of the job to GitHub whatsoever, the job may be set to be optional and silent by setting skip_report: true. It is valid to set both of these options at the same time.

Protecting Status Contexts

The branch protection rules will only enforce the presence of jobs that run unconditionally and have required status contexts. As conditionally-run jobs may or may not post a status context to GitHub, they cannot be required through this mechanism.

Pod Utilities

If you are adding a new job that will execute on a Kubernetes cluster (agent: kubernetes, the default value) you should consider using the Pod Utilities. The pod utils decorate jobs with additional containers that transparently provide source code checkout and log/metadata/artifact uploading to GCS.

Job Environment Variables

Prow will expose the following environment variables to your job. If the job runs on Kubernetes, the variables will be injected into every container in your pod, If the job is run in Jenkins, Prow will supply them as parameters to the build.

Variable Periodic Postsubmit Batch Presubmit Description Example
JOB_NAME ✓ ✓ ✓ ✓ Name of the job. pull-test-infra-bazel
JOB_TYPE ✓ ✓ ✓ ✓ Type of job. presubmit
JOB_SPEC ✓ ✓ ✓ ✓ JSON-encoded job specification. see below
BUILD_ID ✓ ✓ ✓ ✓ Unique build number for each run. 12345
PROW_JOB_ID ✓ ✓ ✓ ✓ Unique identifier for the owning Prow Job. 1ce07fa2-0831-11e8-b07e-0a58ac101036
REPO_OWNER ✓ ✓ ✓ GitHub org that triggered the job. kubernetes
REPO_NAME ✓ ✓ ✓ GitHub repo that triggered the job. test-infra
PULL_BASE_REF ✓ ✓ ✓ Ref name of the base branch. master
PULL_BASE_SHA ✓ ✓ ✓ Git SHA of the base branch. 123abc
PULL_REFS ✓ ✓ ✓ All refs to test. master:123abc,5:qwe456
PULL_NUMBER ✓ Pull request number. 5
PULL_PULL_SHA ✓ Pull request head SHA. qwe456

Examples of the JSON-encoded job specification follow for the different job types:

Periodic Job:

{"type":"periodic","job":"job-name","buildid":"0","prowjobid":"uuid","refs":{}}

Postsubmit Job:

{"type":"postsubmit","job":"job-name","buildid":"0","prowjobid":"uuid","refs":{"org":"org-name","repo":"repo-name","base_ref":"base-ref","base_sha":"base-sha"}}

Presubmit Job:

{"type":"presubmit","job":"job-name","buildid":"0","prowjobid":"uuid","refs":{"org":"org-name","repo":"repo-name","base_ref":"base-ref","base_sha":"base-sha","pulls":[{"number":1,"author":"author-name","sha":"pull-sha"}]}}

Batch Job:

{"type":"batch","job":"job-name","buildid":"0","prowjobid":"uuid","refs":{"org":"org-name","repo":"repo-name","base_ref":"base-ref","base_sha":"base-sha","pulls":[{"number":1,"author":"author-name","sha":"pull-sha"},{"number":2,"author":"other-author-name","sha":"second-pull-sha"}]}}

Testing a new job

See "How to test a ProwJob".