[PATCH 0/2] Make it easy to use branch --track on existing branch

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I'm starting a new thread to avoid hiding the message in another one,
but this is a followup to a message in the "git push --track" thread:

http://article.gmane.org/gmane.comp.version-control.git/137066

I wrote:
> Junio C Hamano <gitster <at> pobox.com> writes:
> 
> > The small nit is that "branch -f --track me origin/me" will happily
> > overwrite "me", even when your "me" is not up to date with "origin/me",
> > losing commits.
> 
> And another issue is:
> 
> $ git branch -f --track my-branch origin/my-branch
> fatal: Cannot force update the current branch.
> $ git branch --track my-branch origin/my-branch
> fatal: A branch named 'my-branch' already exists.
> 
> Actually, I just can't find a natural set of commands doing:
> 
> 1. create a branch (git checkout -b)
> 2. work on it
> 3. send it upstream (git push)
> 4. set the upstream as tracking (???)
> 
> with the current version of Git. I just do 4. with $EDITOR
> .git/config ...

The first patch makes it possible to use branch --track on an existing
branch (checked-out or not, regardless of -f), and the second warns on
a newly introduced irrelevant case.

This should be a nice complement to "push --set-upstream". I think
"push --set-upstream" is the most natural in 99% of cases, but using
"git branch" should work too.

Matthieu Moy (2):
  branch: allow creating a branch with same name and same starting
    point.
  branch: warn and refuse to set a branch as a tracking branch of
    itself.

 branch.c                 |   59 ++++++++++++++++++++++++++++++++-------------
 t/t6040-tracking-info.sh |    8 ++++++
 2 files changed, 50 insertions(+), 17 deletions(-)

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