Table of Contents

• Pipeline: GitHub
• License
• Prerequisites
• Credentials
• Triggers
  • issueCommentTrigger
• Global Variables
  • pullRequest
• Auxiliary Classes
  • CommitStatus
  • Commit
  • CommitFile
  • IssueComment
  • ReviewComment
• Examples

Pipeline: GitHub

The entry points for this plugin’s functionality are additional global variables, available to pipeline scripts when the plugin is enabled and the prerequisites are met.

License

MIT

Prerequisites

• Jenkins running Java 8 or higher.

• Projects/jobs must be automatically created by the GitHub Organization folder/project type.

See: GitHub Branch Source Plugin

Credentials

Currently all operations against GitHub will be performed using the builds GitHubSCMSource credentials. These will typically be the Scan Credentials you configured in your GitHub Organization.

However you can override this in a pipeline script by calling setCredentials(String userName, String password) before any properties or methods are accessed/invoked on the pullRequest global variable.

pullRequest.setCredentials('John.Smith', 'qwerty4321')

If you plan to use this plugin to add/modify/remove comments, labels, commit statuses etc. Please ensure that the required permissions are assigned to the token supplied in the credentials (Scan Credentials or Manually supplied).

Triggers

This plugin adds the following pipeline triggers

issueCommentTrigger

Requirements

• This trigger only works on Pull Requests, created by the GitHub Branch Source Plugin.
• Currently this trigger will only allow collaborators of the repository in question to trigger builds.

Limitations

The Pull Request's job/build must have run at least once for the trigger to be registered. If an initial run never takes place then the trigger won't be registered and cannot pickup on any comments made.

This should not be an issue in practice, because a requirement of using this plugin is that your jobs are setup automatically by the GitHub Branch Source Plugin, which will trigger an initial build when it is notified of a new Pull Request.

Considerations

This trigger would be of limited usefulness for people wishing to build public GitHub/Jenkins bots, using pipeline scripts. As there is no way to ensure that a Pull Request's Jenkinsfile contains any triggers. Not to mention you would not want to trust just any Jenkinsfile from a random Pull Request/non-collaborator.

This trigger is intended to be used inside enterprise organizations:

1. Where all branches and forks just contain a token Jenkinsfile that delegates to the real pipeline script, using shared libraries.
2. Trust all their Pull Request authors.

Parameters

• commentPattern (Required) - A Java style regular expression

Usage

Scripted Pipeline:

properties([
    pipelineTriggers([
        issueCommentTrigger('.*test this please.*')
    ])
])

Declarative Pipeline:

pipeline {
    triggers {
        issueCommentTrigger('.*test this please.*')
    }
}

Detecting whether a build was started by the trigger in a script:

def triggerCause = currentBuild.rawBuild.getCause(
    org.jenkinsci.plugins.pipeline.github.trigger.IssueCommentCause
)

if (triggerCause) {
    echo("Build was started by ${triggerCause.userLogin}, who wrote: " +
         "\"${triggerCause.comment}\", which matches the " +
         "\"${triggerCause.triggerPattern}\" trigger pattern.")
} else {
    echo('Build was not started by a trigger')
}

Global Variables

repository

Coming soon!

pullRequest

Usage

Before you can use the pullRequest global variable you must ensure you are actually in a Pull Request build job. The best way to do this is to check for the existence of the CHANGE_ID environment variable.

Scripted Pipeline:

node {
    stage('Build') {
        try {
            echo 'Hello World'
        } catch (err) {
            // CHANGE_ID is set only for pull requests, so it is safe to access the pullRequest global variable
            if (env.CHANGE_ID) {
                pullRequest.addLabel('Build Failed')
            }
            throw err
        }
    }
}

Declarative Pipeline:

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                echo 'Hello World'
            }
        }
    }
    post {
        failure {
            script {
                // CHANGE_ID is set only for pull requests, so it is safe to access the pullRequest global variable
                if (env.CHANGE_ID) {
                    pullRequest.addLabel('Build Failed')
                }
            }
        }
    }
}

Properties

Name	Type	Setter	Description
id	Integer	false
state	String	true	Valid values open or closed
number	Integer	false
url	String	false
patchUrl	String	false
diffUrl	String	false
issueUrl	String	false
title	String	true
body	String	true
locked	Boolean	true	Accepts true, false or 'true', 'false'
milestone	Integer	true
head	String	false	Revision (SHA) of the head commit of this pull request
headRef	String	false	Name of the branch this pull request is created for
base	String	true	Name of the base branch in the current repository this pull request targets
files	Iterable<CommitFile>	false
assignees	List<String>	true	Accepts a List<String>
commits	Iterable<Commit>	false
comments	Iterable<IssueComment>	false
reviewComments	Iterable<ReviewComment>	false
labels	Iterable<String>	true	Accepts a List<String>
statuses	List<CommitStatus>	false
requestedReviewers	Iterable<String>	false
updatedAt	Date	false
createdAt	Date	false
createdBy	String	false
closedAt	Date	false
closedBy	String	false
mergedAt	Date	false
mergedBy	String	false
commitCount	Integer	false
commentCount	Integer	false
additions	Integer	false
deletions	Integer	false
changedFiles	Integer	false
merged	Boolean	false
mergeable	Boolean	false
mergeCommitSha	String	false
maintainerCanModify	Boolean	true	Accepts true, false or 'true', 'false'

Methods

Merge

String merge([String commitTitle, String commitMessage, String sha, String mergeMethod])

Returns the merge's SHA/commit id.

Commit Status

CommitStatus createStatus(String status [, String context, String description, String targetUrl])

Labels

void addLabels(List labels)

void removeLabel(String label)

Assignees

void addAssignees(List assignees)

void removeAssignees(List assignees)

Review Comments

ReviewComment reviewComment(String commitId, String path, int position, String body)

ReviewComment editReviewComment(long commentId, String body)

ReviewComment replyToReviewComment(long commentId, String body)

void deleteReviewComment(long commentId)

Pull Request Comments (Issue Comments)

IssueComment comment(String body)

IssueComment editComment(long commentId, String body)

void deleteComment(long commentId)

Requested Reviewers

void createReviewRequests(List reviewers)

void deleteReviewRequests(List reviewers)

Misc

void setCredentials(String userName, String password)

Auxiliary Classes

CommitStatus

Properties

Name	Type	Setter	Description
id	String	false
url	String	false
status	String	false	One of pending, success, failure or error
context	String	false
description	String	false
targetUrl	String	false
createdAt	Date	false
updatedAt	Date	false
creator	String	false

Methods

None.

Commit

Properties

Name	Type	Setter	Description
sha	String	false
url	String	false
author	String	false
committer	String	false
parents	List<String>	false	List of parent commit SHA's
message	String	false
commentCount	Integer	false
comments	Iterable<ReviewComment>	false
additions	Integer	false
deletions	Integer	false
totalChanges	Integer	false
files	List<CommitFile>	false	List of files added, removed and or modified in this commit
statuses	List<CommitStatus>	false	List of statuses associated with this commit

Methods

Commit Status

CommitStatus createStatus(String status [, String context, String description, String targetUrl])

Review Comment

ReviewComment comment(String body [, String path, Integer position])

CommitFile

Properties

Name	Type	Setter	Description
sha	String	false
filename	String	false
status	String	false	One of
patch	String	false
additions	Integer	false
deletions	Integer	false
changes	Integer	false
rawUrl	String	false
blobUrl	String	false

Methods

None.

IssueComment

Properties

Name	Type	Setter	Description
id	Integer	false
url	String	false
user	String	false
body	String	true
createdAt	Date	false
updatedAt	Date	false

Methods

void delete()

ReviewComment

Properties

Name	Type	Setter	Description
id	Integer	false
url	String	false
user	String	false
createdAt	Date	false
updatedAt	Date	false
commitId	String	false
originalCommitId	Integer	false
body	String	true
path	String	false
line	Integer	false
position	Integer	false
originalPosition	Integer	false
diffHunk	String	false

Methods

void delete()

Examples

Pull Requests

Updating a Pull Request's title and body

pullRequest.title = 'Updated title'
pullRequest.body = pullRequest.body + '\nEdited by Pipeline'

Closing a Pull Request

pullRequest.status = 'closed'

Creating a Commit Status against the head of the Pull Request

pullRequest.createStatus(status: 'success',
                         context: 'continuous-integration/jenkins/pr-merge/tests',
                         description: 'All tests are passing',
                         targetUrl: "${JOB_URL}/testResults")

Locking and unlocking a Pull Request's conversation

if (pullRequest.locked) {
    pullRequest.locked = false
}

Merging a Pull Request

if (pullRequest.mergeable) {
    pullRequest.merge('merge commit message here')
}
// or
if (pullRequest.mergeable) {
    pullRequest.merge(commitTile: 'Make it so..', commitMessage: 'TO BOLDLY GO WHERE NO MAN HAS GONE BEFORE...', mergeMethod: 'squash')
}

Adding a label

pullRequest.addLabel('Build Passing')

Removing a label

pullRequest.removeLabel('Build Passing')

Replacing all labels

pullRequest.labels = ['Bug', 'Feature']

Adding an assignee

pullRequest.addAssignee('Spock')

Removing an assignee

pullRequest.removeAssignee('McCoy')

Replacing all assignees

pullRequest.assignees = ['Data', 'Scotty']

Listing all added/modified/removed files

for (commitFile in pullRequest.files) {
    echo "SHA: ${commitFile.sha} File Name: ${commitFile.filename} Status: ${commitFile.status}"
}

Adding a comment

def comment = pullRequest.comment('This PR is highly illogical..')

Editing a comment

pullRequest.editComment(comment.id, 'Live long and prosper.')
// or
comment.body = 'Live long and prosper.'

Deleting a comment

pullRequest.deleteComment(commentId)
// or
comment.delete()

Adding a review comment

def commitId = 'SHA of the commit containing the change/file you wish to review';
def path = 'src/main/java/Main.java'
def lineNumber = 5
def body = 'The review comment'
def comment = pullRequest.reviewComment(commitId, path, lineNumber, body)

Editing a review comment

pullRequest.editReviewComment(comment.id, 'Live long and prosper.')
// or
comment.body = 'Live long and prosper.'

Deleting a review comment

pullRequest.deleteReviewComment(comment.id)
// or
comment.delete()

Replying to a review comment

pullRequest.replyToReviewComment(comment.id, 'Khaaannnn!')
// or
comment.createReply('Khaaannnn!')

Listing a Pull Request's commits

for (commit in pullRequest.commits) {
   echo "SHA: ${commit.sha}, Committer: ${commit.committer}, Commit Message: ${commit.message}"
}

Listing a Pull Request's comments

for (comment in pullRequest.comments) {
  echo "Author: ${comment.user}, Comment: ${comment.body}"
}

Listing a Pull Request's review comments

for (reviewComment in pullRequest.reviewComments) {
  echo "File: ${reviewComment.path}, Line: ${reviewComment.line}, Author: ${reviewComment.user}, Comment: ${reviewComment.body}"
} 

Listing a commit's statuses

for (commit in pullRequest.commits) {
  for (status  in commit.statuses) {
     echo "Commit: ${commit.sha}, Status: ${status.status}, Context: ${status.context}, URL: ${status.targetUrl}"
  }
}

Creating a Commit Status against arbitrary commits

for (commit in pullRequest.commits) {
  commit.createStatus(status: 'pending')
}

Listing a Pull Request's current statuses

for (status in pullRequest.statuses) {
  echo "Commit: ${pullRequest.head}, Status: ${status.status}, Context: ${status.context}, URL: ${status.targetUrl}"
}

Listing a Pull Request's requested reviewers

for (requestedReviewer in pullRequest.requestedReviewers) {
  echo "${requestedReviewer} was requested to review this Pull Request"
}

Requesting reviewers

pullRequest.createReviewRequests('Spock', 'McCoy')

Deleting requested reviewers

pullRequest.deleteReviewRequests('McCoy')