How to squash commits in a GitHub pull request

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So you’ve contributed some code to an open source project, say, Rails. And they’d like you to squash all of the commits in your pull request. But you’re not a git wizard; how do you make this happen?

Normally, you’d do something like this. I’m assuming upstream is a git remote that is pointing at the official project repository, and that your changes are in your ‘omgpull’ branch:

$ git fetch upstream
$ git checkout omgpull 
$ git rebase -i upstream/master

< choose squash for all of your commits, except the first one >
< Edit the commit message to make sense, and describe all your changes >

$ git push origin omgpull -f

GitHub will then automatically update your pull request with the new commits. Super easy!