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Git Formalities

In order to keep some semblance of an organized git history, there are a few rules that you must follow to keep things proper.

Commit Messages

Commit messages must be in the imperative mood and follow all guidelines put forward in Chris Beams' Guide. This is good reading to get the intent of having proper git history.

Additionally, we "namespace" our commits. Each commit should only concern one particular module. This module should be one of the following. If a change could fall under multiple, it should be split up to keep commits as small in scope as possible.

  • [all] = affects many different modules/crates
  • [cargo] = changes to the build
  • [ci] = CI on all platforms.
    • [ci-nix] = CI on Mac and Linux.
      • [ci-osx] = CI on OSX.
      • [ci-linux] = CI on Linux.
    • [ci-win] = CI on Windows.
  • [docs] = documentation changes.
  • [ide] = changes to accommodate a particular ide
  • [git] = git specific changes (.gitignore etc).
  • [*] = (fill in * with the name) nova module nova-*. (ex. nova-shaderpack would be [shaderpack])
  • [tools] = changes to assorted tooling

Merge Style

You should clean up your branch before merge and rebase away all issues with the history. This history will be merged with a merge commit, so having a sane history is important. Additionally you should NEVER MERGE MASTER as that leads to Foxtrot merges. If you need to bring your branch up to date, always use rebasing. See below for some helpful tips.

Git IDE

It is generally recommended to use a git IDE of some kind to make the operations easier to deal with and to visualize. I (cwfitzgerald) am partial to Sublime Merge, but VSCode and others would work just as well.

Git Cheatsheet

Rebasing can cause diverging histories, especially if people are going in and meddling in each other's branches. This is how to deal with common situations.

Upstream Updated Normally

git pull --ff origin <branch>

If you have conflicting changes in your working directory:

git stash
git pull --ff origin <branch>
git stash pop

This may cause some "merge" conflicts that need to be resolved, but will do so without causing unnecessary merge commits.

Upstream Force Pushed

This operation will nuke all changes your working directory. Always use stash unless your working directory is unchanged.

git stash
git fetch origin
git reset --hard origin/<branch>
git stash pop

Master Changed

This is when you need to rebase on master to get changes in master.

git fetch origin
git rebase origin/master

You will get plenty of merge issues. Look at the issues, resolve them in a way that makes sense for your branch, stage them, then issue one of the following commands:

git rebase --continue # if index isn't empty
git rebase --skip     # if index is empty

To tell if the index is empty, just do:

git status

If there are green entries the index has changes.