Does not respect the :use_sudo, false flag

[ressu]

While I understand that it's impossible to install required packages without root privileges, rbenv:setup tries to use sudo even if the use of sudo is forbidden.

A more suitable solution would be to either tell the user which packages are required for installation or just simply fail the task.

[yyuu]

Sounds reasonable. I will try to abort task with messages about missing dependencies if :use_sudo set as false.

[yyuu]

In Capistrano 2.x, the :use_sudo just indicates that the application will be deployed via sudo or not. I don't believe :use_sudo is the appropriate global flag to determine whether the user can invoke commands via sudo or not.

If you don't like capistrano-rbenv to install packages, setting :rbenv_install_packages as false will prevent package installation from capistrano-rbenv. You can manage packages via Chef, Puppet or other tools.

Though, improving error logging on failed package installation is still helpful. I'd like to work for it.

[ressu]

This isn't a major issue for me either, I just do the initial setup manually and after that things are just peachy. I opened the issue mostly because it might be confusing to someone not too familiar on what is actually happening and why things are failing.

I think I'll still set :rbenv_install_packages to false in any case for my project. There is no point in inspecting the environment if there is nothing to be done if something is wrong.

[yyuu]

Added message on failed package installation at 5d24339.