GitHub Pull Request

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Revision as of 23:40, 14 September 2018 by Mharmsen (talk | contribs) (→‎GitHub - Creating a Pull Request)

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Overview

Github Pull Request is a way to keep the official repo clean by allowing other developers to review your patch before it gets merged into the corresponding branch. It offers a lot of benefits over the gerrithub. See Gerrit vs GitHub Pull Request for entire adv/disadvantages

GitHub - Initial setup

  • Clone the upstream project into a local repository
$ git clone https://github.com/dogtagpki/pki.git
  • Create a fork of the project by clicking on the fork button:
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  • Now, you'll have your own copy of Forked repo in the format: https://github.com/<your Github ID>/pki
  • Now add this remote to your cloned repo
$ cd pki
$ git remote add personal https://github.com/<your Github ID>/pki
  • Check whether you see the following output:
$ git remote -v
origin	https://github.com/dogtagpki/pki (fetch)
origin	https://github.com/dogtagpki/pki (push)
personal	https://github.com/SilleBille/pki.git (fetch)
personal	https://github.com/SilleBille/pki.git (push)

Travis - Enabling Travis CI for forked repo

1. Go to https://travis-ci.org/ and sign in using Github (Top right button)

2. Add the forked repository by clicking the + sign next to My Repositories.

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3. Select the forked repository.

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If necessary, click on Sync projects from GitHub or Sync account on the top right of the page to refresh the list of repositories.

GitHub - Verify Travis CI for forked repo

In your forked project, (e. g. - https://github.com/<your Github ID>/pki/settings/installations), go to Settings -> Integration & services, verify that Travis CI appears under Services.

Travis 5.png

Submitting patches from a local dev branch

  • Checkout the branch to which you want to submit patch:
# To submit patches to master:
$ git checkout master

# To submit patches to DOGTAG_10_5_BRANCH:
$ git checkout DOGTAG_10_5_BRANCH
  • Create a new local dev branch (which you'll be submitting as the PR):
$ git checkout -b ticket-<number>
  • Make changes (or cherry-pick changes from other branches) and commit them to your new local dev branch:
$ git commit -a
  • Optionally verify that the push has been committed to the local dev branch
 # For master:
 $ git branch
   master
 * ticket-<number>
 
 # For DOGTAG_10_5_BRANCH:
 $ git branch
   DOGTAG_10_5_BRANCH
   master
 * ticket-<number>
  
 $ git log
  • Push the new local dev branch to your repo
# Note that ticket-<number> is the new local dev branch you created
$ git push personal ticket-<number>
  • This will trigger a travis CI build.

GitHub - Creating a Pull Request

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  • Go to https://github.com/<your Github ID>/pki/compare (a redirect should occur). Choose the correct to and from branch. You should see the list of commits that will form as patch. You'll see a screen similar to this:
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If there is an error, you'll see something like this:

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  • Fill in the Commit Message and Commit Description that will appear in the official repo commit history
  • Click on "Create Pull Request"

Merge and update fork

  • Once your patch goes through and changes are reviewed, your patch is ready to be merged
  • Click on the drop down next to "Merge"
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  • Use the following guideline to keep the official repo commit history CLEAN:
Create Merge Commit = Creates a new commit on top of the last commit in the official branch (Not recommended)
Squash & Merge      = Use when you have lot of insignificant commits (like correcting changes from reviewers). This will Squash all your commits into 1 single commit
Rebase & Merge      = Use when your patch is actually a combination of different patches (every commit is significant). This will copy all the commits on top of the last commit in the branch
  • Once merged, Github will provide you an option to delete your branch. DELETE IT!
  • Now, to keep your fork clean and in-sync with official repo do this in your local:
$ git checkout master           # or the branch you want to sync
$ git pull origin master        # or the branch you want to sync
$ git push personal master      # or the branch you want to sync
$ git branch -D ticket-<number> # Delete the local branch which you deleted from Github

References

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