Hi all-
    I've discovered a difference in behavior between `git rebase` and  
`git rebase -i`, and I believe the behavior exhibited by `git rebase - 
i` is incorrect and should be changed to match `git rebase`. The  
behavior difference occurs when running the command in the form:

git rebase [-i] <upstream> <branch>

    If <upstream> is "HEAD", `git rebase` seems to perform these  
(correct) steps:

A=$(git rev-parse HEAD)
git checkout <branch>
git rebase $A

    However, `git rebase -i` seems to perform these (incorrect) steps:

git checkout <branch>
git rebase -i HEAD

    The problem is that `git checkout` changes the meaning of HEAD  
(naturally), and so these steps are not equivalent. The end result is  
that `git rebase -i HEAD <branch>` just checks out <branch> and prints  
"Nothing to do", while when -i is omitted the rebase occurs as  
expected. Below is a transcript that shows exactly what I mean.

-Adam


% git init
Initialized empty Git repository in .git/
% touch onmaster
% git add onmaster
% git commit -m "Added onmaster"
Created initial commit 7c3e0f1: Added onmaster
  0 files changed, 0 insertions(+), 0 deletions(-)
  create mode 100644 onmaster
% touch onmaster2
% git add onmaster2
% git commit -m "Added onmaster2"
Created commit c19019b: Added onmaster2
  0 files changed, 0 insertions(+), 0 deletions(-)
  create mode 100644 onmaster2
% git checkout -b work HEAD^
Switched to a new branch "work"
% touch onwork
% git add onwork
% git commit -m "Added onwork"
Created commit ae14495: Added onwork
  0 files changed, 0 insertions(+), 0 deletions(-)
  create mode 100644 onwork
% touch onwork2
% git add onwork2
% git commit -m "Added onwork2"
Created commit 64b3dc0: Added onwork2
  0 files changed, 0 insertions(+), 0 deletions(-)
  create mode 100644 onwork2
% ls
onmaster onwork   onwork2
% git checkout master
Switched to branch "master"
% ls
onmaster  onmaster2
% git rebase -i HEAD work
Nothing to do
% ls
onmaster onwork   onwork2

-
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