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With Git you will make a copy of the entire code repository to your local machine, so you will have access to all history and branches offline. This is the fastest and most flexible way to develop or test patches.
Git
You will need an installed version of Git, which you can get from http://git-scm.com. Many systems also have a recent version of Git installed by default, or available in their package repository system.
To being using the Git repository, make a clone of the official mirror:
git clone git://git.postgresql.org/git/postgresql.git
This will copy the full repository to your local machine, so it may take a while to complete, especially if you have a slow Internet connection.
The Git mirror can also be reached via the HTTP protocol in case for example a firewall is blocking access to the Git protocol. Just replace the URL like:
git clone http://git.postgresql.org/git/postgresql.git
The HTTP protocol is less efficient than the Git protocol, so it will be slightly slower to use.
Whenever you want to get the latest updates in the system, cd into the repository, and run:
git fetch
Git can do a lot more things than just fetch the source. For more information, consult the man pages for the product, or the website at http://git-scm.com.