##How To Reset Your Github Fork
Let’s say I want to contribute to a project on github. The project repository is at wp-cli/wp-cli. First I fork it, and then clone the resulting repository, scribu/wp-cli:
git clone --recursive git@github.com:scribu/wp-cli.git
cd wp-cli
Now, I make some commits to master, push them to my fork and open a pull request. Piece of cake:
git commit -m "awesome new feature"
git push
But, what happens if my pull request is rejected or only certain commits are accepted? I’m left with a dirty master branch. Oh noes!
There are two ways of solving this:
A. Delete my fork and create it again via the github interface. Can’t get any easier than that.
B. Use git reset:
git remote add upstream git://github.com/wp-cli/wp-cli.git
git fetch upstream
git branch backup
git reset --hard upstream/master
git push --force
If I made a mistake, I can rescue my commits by calling git checkout backup.
PS: You can avoid this problem entirely by pushing your commits to a branch, instead of to master.
From: (http://scribu.net/blog/resetting-your-github-fork.html)
Thank you!