Hi,
the man page of git-config explains that branch.<name>.remote has an influence on the default behavior of fetch. It looks like it also has an influence on the default of push. This is what I was looking for. But I could not find that influence on push documented.
I found that I had to setup branch.<name>.remote (and branch.<name>.merge) entries for my branches in order to have only the current branch pushed when I use git push without arguments. That's what I want. If I don't have these settings all branches get pushed. In addition a separate remote has to exist for every branch.
Somehow I feel this should be mentioned in the man page of git-config or
git-push.
Cheers, Michael