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Development workflow

Before starting

Fork the repo (click on the fork button near the top right corner), then clone it on your machine and setup the upstream remote accordingly. For instance, if your github name is JohnDoe:

git clone https://github.com/JohnDoe/lnb_chess.git
cd lnb_chess
git remote add upstream https://github.com/Dauphine203/lnb_chess.git

The URLs can be copied with the Clone or Download green button. Then check that everything is ok

git remote -v

You should see 4 lines, two for origin with the URL of your fork, and two for upstream with the URLs of the original repo.

The development workflow should respect the following principle:

  • never commit on master, always create a branch dedicated to the feature you are developing
  • do small changes, commit ofter, open small PRs so your mates can quickly review and merge them
  • always rebase on master before pushing for opening a PR
  • you should not merge your own PRs

Use Case 1: you start to develop a new feature

First, be sure you master is up to date; on your remote fork on github (here JohnDoe/lnb_chess) you should see This branch is even with Dauphine203/lnb_chess. If not, you need to update:

git pull upstream master
git push origin master

The first command update your local master branch with the changes in Dauphine203:master, the second one push the changes from your local master to your remote fork.

Then create a new branch and start to work:

git checkout -b board

This line creates the condition branch (because you want to work on the chess board for instance), and make it your current branch. Now everything you commit will be recorded in this branch, not in master.

When your implementation is done (check that it compiles, better code a test and have it passing), you're ready to commit your change. First ensure you are on the right branch:

git branch

This should list all the available branches, the current one should be in a different color and/or prefixed with a star. Now run git status to get a list of the files you've changed. Everything listed in green is ready to be commited, everything in red must be added first (except if you don't want to commit this change); assume you've changed chess_board.hpp and chess_board.cpp, then run:

git add chess_board.hpp
git add chess_board.cpp
git status
git commit -m "Implementation of chess board"

The git status is not mandatory, it just helps to check the files were added (they should be listed in green). Try to write meaningful messages for the commits, they will help you (and your mates) remember what the commit is about.

Now that you local branch contains your feature, it's time to diffuse it to the world!

git push origin board

You can then open a Pull Request from the github interface: once it has been pushed, you should see some message with a yellow background and a button "compare and open PR", or just select your branch and then click on "New pull request".

Wait for your team mate to merge your PR. Once it's done, it's time to update your master branch and delete the board branch (you don't need it anymore).

git checkout master
git pull upstream master
git push origin master

The first command change the current branch to be master (you can check that with git branch before pulling), the two following update your local and remote master as explained at the beginning of the section. Now your feature is in master, let's delete the board branch:

git branch -d board
git push origin :board

The first line delete your local board branch, the second one deletes the remote one.

You can now create a new branch and start to develop a new feature or fix a bug.

Use case 2: you want to update master while developping

Sometimes you will need to get some features developed by your team mates that were developed in parallel and that you need to finish your current development. Or some PRs have been merged in master, and you want to ensure you don't have any conflict before pushing your branch. Assume you are on a branch named board and you want to update master. First, save your current development:

git add chess_board.hpp
git add chess_board.cpp
git commit -m "implementation of a chess board"

Then update master:

git checkout master
git pull upstream master
git push origin master

You can now rebase your board branch, that is, putting it after the changes you pulled in master:

git checkout board
git rebase master

It is highly recommended to always rebase on master before pushing for a PR.

Cheatsheet

Commit

  • git status: list all the changes not commited yet.
  • git add filename: record the file filemane so it will be included in the next commit
  • git commit -m "commit message": commit all the files recorded with git add to the current branch
  • git log -n 10: list the 10 last commits on the current branch

branches

  • git branch: list the available local branches; the current one is in a different color or prefixed with a star.
  • git checkout my_branch: set the current branch to my_branch. This one must already exist.
  • git checkout -b my_branch: creates a new branch calle my_branch and set the current branch to it.
  • git rebase branch_name: rebase the current branch to the branch branch_name.

remote

  • git pull remote_name branch_name: update the current branch with the changes from the branch branch_name of the remote repo remote_name.
  • git push remote_name branch_name: push the branch branch_name to the remote repo remote_name.
  • git push remote_name :branch_name: delete the branch branch_name from the remote repo remote_name.
  • git remote -v: list the available remote repos and their URLs.

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