Git helper for pending push

[fgarcia]

I believe that some type of warning or error message when trying to deploy with pending commits would be a sane default.

I use this little helper that prevents my most frequent deployment problem. I leave to the maintainers deciding if this is useful and if it should be a default or a helper function.

def no_push_pending!
  pending = system "[ $(git log origin/master..master | wc -l) -ne 0 ]"
  fail "Pending git push!" if pending
end

desc "Deploys the current version to the server."
task :deploy => :environment do
  no_push_pending!
  deploy do
    invoke :'git:clone'
    invoke :'deploy:link_shared_paths'
    ....
  end
end

Obviously the current helper is limited because it only considers the 'master' branch.

[13k]

You could improve it by using the branch setting instead of hard-coding master

[d4be4st]

would love a PR for this. and using branch setting :)