Change branch-off point

Question

I have a branch called feature and it has a few commits. The branch and its commits are still local to my machine (haven't been pushed to a public repository). The graph looks like

A---B---C---D---E---F---G master
                    \
                     P---Q---R feature

Now I realized that I should've made the branch feature off of an earlier commit on master. Let's say commit C. In other words, the graph should look like

A---B---C---D---E---F---G master
         \
          P---Q---R feature

What I am trying to do in essence is revert commits D, E and F out of the feature branch. Yes, I could just revert commits one at a time but there are too many to revert; the above picture is just an illustration.

Answer 1

What you want to do is a rebase. To pick up the commits P, Q and R and apply them on top of C, you execute:

git rebase --onto C F feature

See the man-page of git-rebase for more information.