config.md

Configuring Tide

Configuration of Tide is located under the prow/config.yaml file. All configuration for merge behavior and criteria belongs in the tide yaml struct, but it may be necessary to also configure presubmits for Tide to run against PRs (see 'Configuring Presubmit Jobs' below).

This document will describe the fields of the tide configuration and how to populate them, but you can also check out the GoDocs for the most up to date configuration specification.

To deploy Tide for your organization or repository, please see how to get started with prow.

General configuration

The following configuration fields are available:

• sync_period: The field specifies how often Tide will sync jobs with GitHub. Defaults to 1m.
• status_update_period: The field specifies how often Tide will update GitHub status contexts. Defaults to the value of sync_period.
• queries: List of queries (described below).
• merge_method: A key/value pair of an org/repo as the key and merge method to override the default method of merge as value. Valid options are squash, rebase, and merge. Defaults to merge.
• target_url: URL for tide status contexts.
• pr_status_base_url: The base URL for the PR status page. If specified, this URL is used to construct a link that will be used for the tide status context. It is mutually exclusive with the target_url field.
• max_goroutines: The maximum number of goroutines spawned inside the component to handle org/repo:branch pools. Defaults to 20. Needs to be a positive number.

Queries

The queries field specifies a list of queries. Each query corresponds to a set of open PRs as candidates for merging. It can consist of the following dictionary of fields:

• orgs: List of queried organizations.
• repos: List of queried repositories.
• labels: List of labels any given PR must posses.
• missingLabels: List of labels any given PR must not posses.
• excludedBranches: List of branches that get excluded when querying the repos.
• includedBranches: List of branches that get included when querying the repos.
• reviewApprovedRequired: If set, each PR in the query must have at least one approved GitHub pull request review present for merge. Defaults to false.

Under the hood, a query constructed from the fields follows rules described in https://help.github.com/articles/searching-issues-and-pull-requests/. Therefore every query is just a structured definition of a standard GitHub search query which can be used to list mergeable PRs. The field to search token correspondence is based on the following mapping:

• orgs -> org:kubernetes
• repos -> repo:kubernetes/test-infra
• labels -> label:lgtm
• missingLabels -> -label:do-not-merge
• excludedBranches -> -branch:dev
• includedBranches -> branch:master
• reviewApprovedRequired -> review:approved

Important: Each query must return a different set of PRs. No two queries are allowed to contain the same PR.

Every PR that needs to be rebased or is failing required statuses is filtered from the pool before processing

Context Policy Options

A PR will be merged when all checks are passing. With this option you can customize which contexts are required or optional.

By default, required and optional contexts will be derived from Prow Job Config. This allows to find if required checks are missing from the GitHub combined status.

If branch-protection config is defined, it can be used to know which test needs be passing to merge a PR.

When branch protection is not used, required and optional contexts can be defined globally, or at the org, repo or branch level.

If we want to skip unknown checks (ie checks that are not defined in Prow Config), we can set skip-unknown-contexts to true. This option can be set globally or per org, repo and branch.

Important: If this option is not set and no prow jobs are defined tide will trust the GitHub combined status and will assume that all checks are required (except for it's own tide status).

Example

tide:
  merge_method:
    kubeflow/community: squash

  target_url: https://prow.k8s.io/tide.html

  queries:
  - repos:
    - kubeflow/community
    - kubeflow/examples
    labels:
    - lgtm
    - approved
    missingLabels:
    - do-not-merge
    - do-not-merge/hold
    - do-not-merge/work-in-progress
    - needs-ok-to-test
    - needs-rebase

  context_options:
    # Use branch protection options to define required and optional contexts
    from-branch-protection: true
    # Treat unknown contexts as optional
    skip-unknown-contexts: true
    orgs:
      org:
        required-contexts:
        - "check-required-for-all-repos"
        repos:
          repo:
            required-contexts:
             - "check-required-for-all-branches"
            branches:
              branch:
                from-branch-protection: false
                required-contexts:
                - "required_test"
                optional-contexts:
                - "optional_test"

Explanation: The component starts periodically querying all PRs in github.com/kubeflow/community and github.com/kubeflow/examples repositories that have lgtm and approved labels set and do not have do-not-merge, do-not-merge/hold, do-not-merge/work-in-progress, needs-ok-to-test and needs-rebase labels set. All PRs that conform to the criteria are processed and merged. The processing itself can include running jobs (e.g. tests) to verify the PRs are good to go. All commits in PRs from github.com/kubeflow/community repository are squashed before merging.

Configuring Presubmit Jobs

Before a PR is merged, Tide ensures that all jobs configured as required in the presubmits part of the config.yaml file are passing against the latest base branch commit, rerunning the jobs if necessary. No job is required to be configured in which case it's enough if a PR meets all GitHub search criteria.

Semantic of individual fields of the presubmits is described in prow/README.md#how-to-add-new-jobs.