Jul 8, 2015

Useful Git Commands

Some notes on terminology

In case you’re not familiar with some of the terminology used below, here is a small glossary.

Object

An object in Git is either a blob (file), tree (directory), commit, or tag. All objects in Git have a hash (like 99b69df491c0bcf5262a967313fad8be0098352e) and are connected in a way that allows them to be modelled as a directed acyclic graph.

Reference

A reference in Git is a bit like a pointer, or a symlink. References are not objects themselves, and they always point to either an object or another reference. Branches, tags, and HEAD are examples of references.

You can learn about all of this and much more in my Hacker’s Guide to Git.

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May 25, 2014

A Hacker's Guide to Git

A Hacker’s Guide to Git is now available as an e-book. You can purchase it on Leanpub.

Introduction

Git is currently the most widely used version control system in the world, mostly thanks to GitHub. By that measure, I’d argue that it’s also the most misunderstood version control system in the world.

This statement probably doesn’t ring true straight away because on the surface, Git is pretty simple. It’s really easy to pick up if you’ve come from another VCS like Subversion or Mercurial. It’s even relatively easy to pick up if you’ve never used a VCS before. Everybody understands adding, committing, pushing and pulling; but this is about as far as Git’s simplicity goes. Past this point, Git is shrouded by fear, uncertainty and doubt.

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Aug 16, 2013

Force Bower to clone from https:// instead of git://

Most Bower packages will be fetched using a git:// URL, which connects on port 9418. This can be problematic if you’re behind a firewall which blocks this port.

You can get around this quite easily by telling Git to always use https:// instead of git://:

git config --global url.https://.insteadOf git://
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Mar 14, 2012

Git: Ignore changes to already-tracked files

There are often times when you want to modify a file but not commit the changes, for example changing the database configuration to run on your local machine.

Adding the file to .gitignore doesn’t work, because the file is already tracked. Luckily, Git will allow you to manually “ignore” changes to a file or directory:

git update-index --assume-unchanged <file>

And if you want to start tracking changes again, you can undo the previous command using:

git update-index --no-assume-unchanged <file>

Easy!

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Feb 8, 2012

Converting an SVN repository to Git

Today I found out just how easy it is to convert an SVN repository to Git without losing any commit history. Note that you will need git-svn (apt-get install git-svn on Debian/Ubuntu).

git svn clone http://mysvnrepo.com/my-project my-project
cd my-project
git remote add origin git@mygitrepo.com:/my-project.git
git push origin master

Et voilà, my-project.git has the full commit history of the my-project SVN repository.

If anybody knows whether SVN branches can be converted to Git branches, please get in touch!

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Aug 28, 2011

Useful Git Configuration Items

Name and email address

Each commit you make has your name and email address attached to it. Git will automatically configure these based on your username and hostname, but this information is usually not a good identifier. It is a good idea to set your real name and email address so that your commits can be identified easily.

git config --global user.name "Your Name"
git config --global user.email you@yourdomain.com

Global ignore file

Often there are files or directories that you want Git to ignore globally. These are probably created automatically by your IDE or operating system. Git’s core.excludesfile config allows you to write a global .gitignore so that you don’t have to fill local .gitignore files with clutter.

git config --global core.excludesfile /path/to/.gitignore_global
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Aug 20, 2011

Deploying a Git repository to a remote server

Git’s archive command is basically the equivalent of SVN’s export – it dumps a copy of the entire repository without any of the version control files, making it perfect for deploying to a testing or production server.

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