Git push existing repo to a new and different remote repo server?

There is a deleted answer on this question that had a useful link: https://help.github.com/articles/duplicating-a-repository

The gist is

0. create the new empty repository (say, on github)
1. make a bare clone of the repository in some temporary location
2. change to the temporary location
3. perform a mirror-push to the new repository
4. change to another location and delete the temporary location

OP's example:

On your local machine

$ cd $HOME
$ git clone --bare https://git.fedorahosted.org/the/path/to/my_repo.git
$ cd my_repo.git
$ git push --mirror https://github.com/my_username/my_repo.git
$ cd ..
$ rm -rf my_repo.git

1. Create a new repo at github.
2. Clone the repo from fedorahosted to your local machine.
3. git remote rename origin upstream
4. git remote add origin URL_TO_GITHUB_REPO
5. git push origin master

Now you can work with it just like any other github repo. To pull in patches from upstream, simply run git pull upstream master && git push origin master.

To push your existing repo into different, you need to:

1. Clone the original repo first.

   git clone https://git.fedorahosted.org/cgit/rhq/rhq.git
   

2. Push the cloned sources to your new repository:

   cd rhq
   git push https://github.com/user/example master:master
   

You may change master:master into source:destination branch.

---

If you want to push specific commit (branch), then do:

1. On the original repo, create and checkout a new branch:

   git checkout -b new_branch
   

2. Choose and reset to the point which you want to start with:

   git log # Find the interesting hash
   git reset 4b62bdc9087bf33cc01d0462bf16bbf396369c81 --hard
   

   Alternatively select the commit by git cherry-pick to append into existing HEAD.

3. Then push to your new repo:

   git push https://github.com/user/example new_branch:master
   

   ^{If you're rebasing, use -f for force push (not recommended). Run git reflog to see history of changes.}