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Lecture #6: Branching and working with remote repositories

Lecture Objectives

  1. use branching & merging to isolate changes to code
  2. describe the benefits of a cloud-based git service
  3. describe a situation in which a local server-based repo is sufficient
  4. clone a github based repo
  5. push changes from a local clone of a repo to the cloud-based repo
  6. add remote repos to your local clone
  7. create a pull request
  8. comment on a pull request
  9. ensure that your fork (and clone) are synchronized with changes in the "upstream" repo
  10. amend a pull request based on feedback

Textbook Reference

Chapter 15, pages 365-367

Chapter 16, pages

Activities

  1. Add a layer to the onion with branching (20 min)

    • describe branching workflow
    • go to planets directory
    • create a new branch called venus
    • change to that branch
    • create/edit a file named venus.txt that says "Kind of cloudy and hard to breath"
    • add/commit that file to this branch
    • complete another edit/add/commit cycle to this file that says "Maybe we can build cities in the clouds"
    • change to the master branch
    • look at differences between branches
    • merge venus into master

  2. Introduce rebase (20 min)

    • from master create and switch to a new branch earth
    • create/add/commit a file earth.txt with some interesting fact about earth
    • switch back to master
    • repeat with jupiter
    • switch back to master
    • compare master vs earth and master vs jupiter
    • merge earth into master
    • switch to jupiter
    • discuss rebase vs merge
    • rebase jupiter onto master
    • switch back to master
    • compare master vs jupiter
    • merge jupiter into master

  3. discuss differences between simple server and cloud service (4 min)

    • Code browsing with syntax highlighting
    • Collaboration & access control
    • Issue tracking
    • Code review for new contributions
    • Project management

  4. discuss different options: esp. bitbucket & github (1 min)

  5. discuss basic workflow of remote interaction (5 min)

    • simple server or cloud service

      • clone once
      • fetch, merge/rebase, (edit, add, commit) x many, push

  6. fork/clone/add element to Chart of Nuclides (15 min)

    1. browse to CoN site
      • explore GH repo
    2. fork repo
      • explore their fork - how is it different from the parent
    3. clone repo
    4. choose an element (randomize) and create a branch with that name
      • discuss why a branch
    5. use a number of edit/add/commit cycles to populate your element - at least partially
    6. push your changed branch back to your repo
      • explore your changed repo

Bonus topics

  1. Change your prompt to constantly show you some git status information

    There are a number of different solutions shared on the internet for changing your bash prompt to show you the current branch you are in, and other information. Here are just a few:

  2. Your life will be much simpler if you don't have to type your password every time you interact with github. I encourage you to set up an ssh key for this: