Sunday, May 17, 2009

Versioning your home directory or documents with Git

Git is a relatively new Version Control System, initially started by Linus Torvalds in order to manage the source code of Linux Kernel.

Although Randal Schwartz has stated that Git was not designed to version your home directory, it seems that many people are now trying to do so :-)

Some people have used CVS or Subversion for this purpose in the past, but to my mind, Git is suited better for this task for several reasons:

  • Git is grep-friendly (only stores it's metadata in a single .git directory at the root of working copy)
  • It is very easy to work with a local repository (just do git init and you're ready)
  • Git stores changes very efficiently (even binary files), so not much disk space is wasted, but don't forget to call git gc from time to time
  • Git repository is always available on your computer, even when you are offline, but on the other hand it is very easy to push your changes to a remote repository as well
All these things are much worse with CVS, which spams all versioned directories with CVS subdirs and stores each version of binary files fully. Subversion also requires more effort to setup, is less storage-efficient, and puts .svn subdirs everywhere.

Having said that, my setup is ultra-simple compared to others on the net!

To start versioning your home directory, just run this in the root of your home:
git init
This will initialize an empty local Git repository in ~/.git/ - this is the location that you can use when doing backups, but otherwise you shouldn't care about it anymore.

Then you need to tell Git to track your important files:
git add Documents
git add bin
git add whatever else you want to version
git commit -m "Adding initial files"
Then you can work normally with your tracked files and occasionally commit your changes to the repository with
git commit -a "description of changes you have done"
Note the "-a" above, that means to commit any changes made to any previously tracked files, so you don't have to use git add again. But don't forget to git add any new files you create before committing.

Use git status to show what files were changed since your last commit. Unfortunately, it will also list all untracked files in your home directory, so you may need to create a .gitignore file. You can get the initial version of this file using this command:
git status | awk '/#/ {sub("/$", ""); print $2}' > .gitignore
then, edit it and possible replace some full names partly with '*'. Don't forget to git add and git commit this file as well!

That's, basically, it! You may also try some GUI tools provided by git, eg gitk or git gui to browse your changes and do some changes if you can't remember the commands.

Moreover, I have some more ideas how to make all this more automatic that I am going to try laster:
  • Put git commit -a to user's crontab in order to commit changes automatically, eg daily
  • Create a couple of nautlus scripts (located in ~/.gnome2/nautilus-scripts) to make adding, comitting and other actions available directly from Nautlilus file manager in Gnome.
Happy versioning! And read the Git tutorial with either man gittutorial or on the official site.


66 comments:

Lauri said...

There is also git-grep which is more powerful than GNU grep (for example Linus finds himself to put files in git repository to use git-grep instead of combination of GNU find and GNU grep).

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