"Kristoffer Haugsbakk" [off-list ref] writes:

This works for me.  But why not this?

    git clone --bare <repo> some-repository
    cd some-repository
    git worktree add some-branch
    git worktree add another-branch

Do you mean "some-repository/config" is the local configuration
file, next to it there are "some-branch" and "another-branch"
directories, and you have to have some way to tell that, among
direct subdirectories of "some-repository/", "some-branch/" is a
worktree while refs/ is not?

No thanks ;-).