Git basics are very simple, but it sometimes feels like a bottomless pit when you find yourself on the wrong side of a confusing error situation. It’s doubly frustrating because you think that messing up or trying the wrong solution can lose data. It’s actually very hard to “lose” data with Git but it can certainly be hiding somewhere you wouldn’t think to look without an experienced dev poking around.
You’ll have your share of misadventures, but everyone does. The best remedy is to commit early and often. The smaller and more modular your commits are, the less that can go wrong if you mess one up.
There’s some debate out there about how to properly use Git in your workflow, but I try to think of it this way: Your commit message should fully describe (in present tense) what the commit includes, e.g. “add About section to navbar on static pages”. If you need to use a comma or the word “and”, you’ve probably got too much stuff in your commit and should think about keeping your changes more modular and independent.
It can also be tempting to immediately fix bugs in your code or tweak some CSS as soon as you see it. Everyone’s guilty of that (ahem). But it’s really best to keep that pen and paper next to you, write down the thing you want to fix, and continue doing what you were doing. Then, when you’ve committed your current feature or merged its feature branch or somehow extricated yourself from the current problem, go back and tackle the things you wanted to touch originally.
Again, it’s all designed to keep your workflow modular and the commits independent so you can easily jump around your Git timeline without messing up too many other things along the way. The first time you need to go back and modify a single monolithic commit, you’ll feel that pain and mend your ways.
The thing about Git is that, unless you’ve got a seriously impressive memory, you can’t just learn it by reading about it up front… you need to do it. Find a problem you want to go back and fix, hit an error in your merge, etc. and Google the hell out of it, learning a new Git tactic in the process.
To help you out, come back and refer to this lesson again when you’re in trouble. We’ll first cover a real-world example of a GitHub workflow used on this very project. The Additional Resources section below should also help you find high quality resources for when you need them later on.
Let’s say you want to contribute to the web application that powers this website (check it out here).
How do you contribute when you do not have write access to the repository? Below is a production-ready workflow that is actually used by contributors to this website. We’ll assume here that you have commented on an open issue and that it has been assigned to you.
The key players in this story will be the
upstream (the original GitHub repository), the
origin (your fork of that repo), and the “local” repository (your local clone of
origin). Think of it as a happy triangle… except that “local” can only pull from
upstream, not push.
$ git clone firstname.lastname@example.org:your_user_name_here/theodinproject.git(you can get the url from the little widget on the sidebar on the right of that repo’s page on GitHub)
origin, which is your fork on GitHub. You will use this to push changes back up to GitHub. You’ll also want to be able to pull directly from the original repository on GitHub, which we’ll call
upstream, by setting it up as another remote. Do this by using
$ git remote add upstream email@example.com:TheOdinProject/theodinproject.gitinside the project folder
$ git config --global user.name "YOUR NAME" $ git config --global user.email "YOUR_EMAIL@EXAMPLE.COM"
We’ve got one main branch –
main is for production-ready code. Any code deployed to
main will be tested in staging and shipped to production. You’ll be working in a feature branch and submitting your pull requests to the
$ git checkout -b your_feature_name.
mainbranch is probably out of date. Fetch the most updated copy using
$ git fetch upstream.
$ git branch --allto see a list of all the branches, including the ones that are normally hidden (e.g. the remote branches you just grabbed). You should see
$ git merge. Specifically, you’ll first want to make sure you’re on your
$ git checkout mainand then
$ git merge upstream/mainto merge in those upstream changes that we just fetched.
$ git fetch upstreamfollowed by a
$ git merge upstream/some_branchis the EXACT same thing as doing a
$ git pull upstream/some_branch. I prefer to split it up so I can explicitly walk through the steps.
mainbranch is up-to-date with upstream, you need to merge it into your feature branch. Yes, that is correct and it seems odd at first. Don’t you want to merge the feature branch into the
mainbranch instead? Yes, you do, but not yet. Your feature branch is dirty. You don’t know if it has any conflicts which might creep up. Any time you are merging in more “senior” branches (e.g. merging the feature into
main), you want it to be a clean and conflict-free merge. So you first merge the “senior” branch into your dirty branch to resolve those conflicts. So do a
$ git checkout your_feature_nameto jump back onto your feature branch then a
$ git merge mainto merge
$ git mergetoolor just manually open up the files that have conflicts. Basically, merge conflicts will insert markers into your conflicting files to denote what lines are part of the incoming code and which lines are part of your pre-existing code. You’ll need to manually edit those files one-by-one (including removing the merge marker text) and then resave them. Once you’ve finished fixing all the files that have conflicts, you need to commit your changes to finish the merge.
main, the hard part is all over. Merge into
$ git checkout mainfollowed by
$ git merge your_feature_name.
mainbranch back up to your
origin(your fork of the
upstreamrepository). You can’t send directly to
upstreambecause you don’t have access, so you’ll need to make a pull request. Use
$ git push origin mainto ship
mainup to your fork on GitHub.
mainback to the original
mainbranch. This can be done using GitHub’s interface.
Look through these now and then use them to test yourself after doing the assignment:
This section contains helpful links to other content. It isn’t required, so consider it supplemental..
Sometimes (okay, maybe a lot of times) when you’re working with Git, something goes terribly wrong. Don’t panic! Git is designed to help you recover from your misfortune. These resources will help you get back on track towards version control nirvana: