Re: Undo a commit that is already pushed to central server and merged to several branches

[Ramkumar Ramachandra <artagnon@gmail.com>]

Hi Matthias,

Matthias Fechner wrote:
> [...]
> I continued to work then on different branches and merged the bad master
> branch to all my other branches.
> [...]
>
> What I would like to do is move this bogus commit into a different branch
> and remove all changes from this bogus commit from every branch.

If I understand correctly, each of your branches looks like*:

o  <--- HEAD of branch; merge commit referencing bogus commit
| \
o  \   <--- This is where you want to move the HEAD to
|   \
o    o  <-- Bogus commit from master branch
|
o
|
o  <-- Branch born

Assuming that you actually want to rewrite the history, the situation
calls for a git-reset(1).  Just "git reset --hard HEAD~1" on each of
your branches (Caution: first understand what it does!) and you'll
rewind the HEAD to "undo" the bad merge.  After that you can just "git
push +foo:foo" to overwrite the foo branch on your server.  If you
don't want to rewrite anything and simply commit the inverse of the
bad commit, see git-revert(1).

* If you're having difficulty understanding the diagram, please read:
http://eagain.net/articles/git-for-computer-scientists/

Cheers.

-- Ram