在git中，如何将主指针（分支）指向另一个提交而不合并？

Question

I was working off of master and made some bad commits C & D .

A --- B --- C --- D (MASTER)

So I decided to restart the work from the known good commit B because I thought it would be easier than to try and find the mistake inside the C and/or D commits. But I also wanted the option of going back to D if the new attempt didn't work out for whatever reason. So I first created a detached HEAD pointing at B and then created a new branch (RETRY). My git repo now looks like this:

A --- B --- C --- D (MASTER)
       \
        \
         E --- F (RETRY)

As it turns out it was easier to just restart work at B and my commit F works wonderfully. So now my question is: how do I make MASTER point to F without merging with all the work done in C and D (but still keeping the C and D commits around in case I want to refer to them in the future)? I want to end up with:

A --- B --- C --- D
       \
        \
         E --- F (MASTER)

Answer 1

git checkout master
git branch old
git reset --hard retry 

Will create (but not switch to) a new branch (called old ) which points to the same commit as master and then move master to point to the same commit as retry .

Answer 2

First, create some branch, say old_master to keep it as pointer to your failed work in master :

git branch old_master master

Now, make master point to F:

git checkout master
git reset --hard F

Later, you can checkout to old_master to see your old bad commits.