GitHub Pull Requests

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GitHub

GitHub is a Web-based Git repository hosting service. It offers all of the distributed revision control and source code management (SCM) functionality of Git as well as adding its own features.

Git Pull Requests

Files can be committed in a Git branch or directly in Master. When committing files in a branch, pull requests let you know what changes you've made to a repository before they are committed to the repository's master branch. Once a pull request is sent, interested parties can review the set of changes, discuss potential modifications, and even push follow-up commits if necessary.

You can configure Globalyzer to scan the files that changed between the two branches of a pull request, and post a Globalyzer Analysis Summary on the pull request in Github.

Example of a Pull Request Analyzed with Globalyzer

PrNewSummaryAnalysis.png

This is pull request #8. The change to the code in the pull request was to add a file containing one embedded string, one locale-sensitive method, one general pattern, and one static file reference to illustrate the different sections of the analysis summary. At the top of the analysis, are issue totals. Then the issues are displayed by type, with the top (up to) ten issues displayed.

Clicking on the file#line link will send the user to the line of code in that respective file. If an issue has associated help, as in the case for most locale-sensitive methods, the issue will appear as a link and clicking the issue will display the associated help.

Before merging the code back to master, the developer would typically externalize embedded strings, fix locale-sensitive method issues, general pattern issues, and static file references and re-submit the changed code for further analysis.

Pre-requisites

You will need read access to the github repository. If using ssh to clone, follow github's guide to set up ssh clone access for an account which may be used for the pull request analysis.

To check and see if you have read access to the github repository, try to clone from the command line:

git clone git@github.com:<RepoName>.git

If you see: fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists. follow the github's guide to correct the issue before moving forward.

Github will need to be able to send HTTPS (port 443) requests which reach your system. See github's guide to github IP addresses here, and check with your IT and networking departments to set up access or forwarding of Github's connections.

Once configured, you may verify that the pull request notifications are making it to the target machine via:

sudo tail -f /var/log/httpd/access_log

An example might look like:

140.82.115.102 - - [18/Nov/2021:17:58:40 +0000] "POST /jenkins/buildByToken/buildWithParameters/build?job=CET-WorldWindExplorer-PullRequest&token=HOOK HTTP/1.1" 201 - "-" "GitHub-Hookshot/93dfdaa"

How to Configure Pull Request Analysis

  1. Configure github.properties
  2. You must create the file /var/lib/jenkins/Lingoport_Data/Dashboard/github.properties with the following contents:

      github.login=<your github login>
      github.oauth=<your github token>
    

    Note: To create a token for yourself on Github, navigate to https://github.com, select Settings from login dropdown, select Developer settings on left, select Personal access tokens, click the Generate new token button. Also note that your access token must have the repo scope selected.

    PullRequestRepos.png

  3. Create a Pull Request Jenkins Job
  4. Create a new Jenkins job named <YourOrganization>.<YourRepoName>-PullRequest by copying the template Lingoport.RepoName-PullRequest job.
    Look at the configuration for your new job and verify that Trigger builds remotely is checked and then set the authentication token; the default is HOOK. The token is the only item you need to configure for your new job.

    Note: Your Jenkins user must have special permissions to configure the PullRequest job. If your job does not have the Trigger builds remotely option, it is likely that your Jenkins user does not have the necessary permissions. Please see here for information on Jenkins Global Security Configuration.

  5. Create a Webhook for your Github Repository
  6. The Pull Request on GitHub needs to trigger a Webhook back to Lingoport's Jenkins instance. To do so:

    • Navigate to the GitHub repository as an Admin account
    • In Settings tab for the GitHub repository (available if the account has Admin permissions), select Webhooks and the Add webhook button.
    • The Webhook should follow this pattern:
      Payload URL: http(s)://JENKINS_URL/jenkins/buildByToken/buildWithParameters/build?job=Group.RepoName-PullRequest&token=HOOK
    
      Content type: application/x-www-form-urlencoded
    
      Pull Request event selected
    
      Active
    

    For example:

    GitHubWebhook.png

    • Also, select: Let me select individual events.
      • Then: Pull Requests
    • Test the Webhook and especially check for firewall issues going back to the Jenkins system. After creating the Webhook, it will attempt to send a payload which should trigger the Jenkins job. While still in Webhooks, select the Recent Deliveries tab.
      • A response of 201 is successful and this can be verified by checking the Jenkins job. It should have been triggered and have some information in it.
      • A response of 404 means that there was a communications issue with Jenkins. Verify that port 443 is open. Once changes have been made, select the Redeliver button to test the payload again.

    WebhookSuccessful.jpg