How can I check out a GitHub pull request?

I'd like to check out a previously created pull request (created via GitHub web interface). I searched and found different places where a refs/pull or refs/pull/pr

But when I add fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to the git config file and do a git fetch

What I'm doing wrong? Should GitHub create automatically the pull/xyz stuff, or do I have to configure something?

---

To fetch a remote PR into your local repo,

git fetch origin pull/ID/head:BRANCHNAME

where ID is the pull request id and branchname is the name of the new branch that you want to create. Once you have created the branch, then simply

git checkout BRANCHNAME

---

This will fetch without you having to name a branch:

git pull origin pull/939/head

How do I get a specific pull request on my machine?

---

That gist does describe what happend when you do a git fetch:

Obviously, change the github url to match your project's URL. It ends up looking like this:

[remote "origin"]
    fetch = +refs/heads/*:refs/remotes/origin/*
    url = git@github.com:joyent/node.git
    fetch = +refs/pull/*/head:refs/remotes/origin/pr/*

Now fetch all the pull requests:

$ git fetch origin
From github.com:joyent/node
 * [new ref]         refs/pull/1000/head -> origin/pr/1000
 * [new ref]         refs/pull/1002/head -> origin/pr/1002
 * [new ref]         refs/pull/1004/head -> origin/pr/1004
 * [new ref]         refs/pull/1009/head -> origin/pr/1009
...

To check out a particular pull request:

$ git checkout pr/999
Branch pr/999 set up to track remote branch pr/999 from origin.
Switched to a new branch 'pr/999'

You have various scripts listed in issues 259 to automate that task.
The git-extras project proposes the command git-pr (implemented in PR 262)

git-pr (1) -- Checks out a pull request locally

SYNOPSIS

git-pr <number> [<remote>]
git-pr clean

DESCRIPTION

Creates a local branch based on a GitHub pull request number, and switch to that branch afterwards.

The name of the remote to fetch from. Defaults to origin .

EXAMPLES

This checks out the pull request 226 from origin :

$ git pr 226

remote: Counting objects: 12, done.
remote: Compressing objects: 100% (9/9), done.
remote: Total 12 (delta 3), reused 9 (delta 3)
Unpacking objects: 100% (12/12), done.
From https://github.com/visionmedia/git-extras
  * [new ref] refs/pull/226/head -> pr/226
Switched to branch 'pr/226'

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