Can't deploy with capistrano - ruby-on-rails

Question

When I try to deploy with capistrano, i'hve got an error :
cap production deploy:setup
I've this error message :
/home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/capistrano-2.0.0/lib/capistrano/gateway.rb:55: formal argument cannot be an instance variable (SyntaxError)
SSH.connect(server, #options) do |#session|
^
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/capistrano-2.0.0/lib/capistrano/configuration/connections.rb:1:in `<top (required)>'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/capistrano-2.0.0/lib/capistrano/configuration.rb:4:in `<top (required)>'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/capistrano-2.0.0/lib/capistrano.rb:1:in `<top (required)>'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/capistrano-2.0.0/lib/capistrano/cli.rb:1:in `<top (required)>'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from /home/paul/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/capistrano-2.0.0/bin/cap:3:in `<top (required)>'
from /home/paul/.rbenv/versions/2.0.0-p247/bin/cap:23:in `load'
from /home/paul/.rbenv/versions/2.0.0-p247/bin/cap:23:in `<main>'
Here is my Capfile :
load 'deploy' if respond_to?(:namespace) # cap2 differentiator
load 'config/deploy'
And my deploy.rb :
require "bundler/capistrano"
# allowing shell interactions
default_run_options[:pty] = true
# multistaging
set :stages, %w(staging production)
set :default_stage, "staging"
require 'capistrano/ext/multistage'
set :application, "myapp"
set :user, "myapp"
set :repository, "git#gitlab.conicrea.com:conicrea/myapp.git"
set :ssh_options, { :forward_agent => true }
set :deploy_to, "/var/www/#{application}"
set :scm, :git
set :deploy_via, :remote_cache
# number of releases we want to keep
set :keep_releases, 3
set :use_sudo, false
# default rails_env, should be overrided in config/deploy/#{environnement}.rb
set :rails_env, "staging"
# unicorn informations
set :unicorn_config, "#{current_path}/config/unicorn.rb"
set :unicorn_pid, "#{shared_path}/pids/unicorn.pid"
set :unicorn_bin, "#{current_path}/bin/unicorn"
# useful for rbenv
set :default_environment, {
'PATH' => "/home/synbioz/.rbenv/shims:/home/synbioz/.rbenv/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
}
namespace :maintenance do
task :start do
run "ln -nfs #{shared_path}/system/_maintenance.html #{shared_path}/system/maintenance.html"
end
task :stop do
run "rm -f #{shared_path}/system/maintenance.html"
end
end
namespace :deploy do
task :start, :roles => :app, :except => { :no_release => true } do
run <<-CMD
cd #{current_path} && #{unicorn_bin} -c #{unicorn_config} -E #{rails_env} -D
CMD
end
task :force_stop, :roles => :app, :except => { :no_release => true } do
run <<-CMD
if [ -e #{unicorn_pid} ]; then
kill -9 $(cat #{unicorn_pid});
fi
CMD
end
task :stop, :roles => :app, :except => { :no_release => true } do
run <<-CMD
if [ -e #{unicorn_pid} ]; then
kill $(cat #{unicorn_pid});
fi
CMD
end
task :graceful_stop, :roles => :app, :except => { :no_release => true } do
run <<-CMD
if [ -e #{unicorn_pid} ]; then
kill -s QUIT $(cat #{unicorn_pid});
fi
CMD
end
task :reload, :roles => :app, :except => { :no_release => true } do
run <<-CMD
if [ -e #{unicorn_pid} ]; then
kill -s USR2 $(cat #{unicorn_pid});
fi
CMD
end
task :restart, :roles => :app, :except => { :no_release => true } do
run <<-CMD
if [ -e #{unicorn_pid} ]; then
kill -9 $(cat #{unicorn_pid});
sleep 5;
cd #{current_path} && #{unicorn_bin} -c #{unicorn_config} -E #{rails_env} -D;
fi
CMD
end
end
desc "Create shared folders."
after 'deploy:setup', :roles => :app do
# for unicorn
run "mkdir -p #{shared_path}/sockets"
run "mkdir -p #{shared_path}/config"
# only for sqlite
run "mkdir -p #{shared_path}/db"
end
desc "Link db.yml."
after 'deploy:update_code', :roles => :app do
run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
end
desc "Seed datas when cold deploying."
after 'deploy:migrate', :roles => :app, :only => { :no_release => true } do
run "cd #{release_path} && bin/rake db:seed RAILS_ENV=#{rails_env}"
end
desc "Link maintenance, rbenv and precompile assets."
after 'deploy:symlink', :roles => [:web, :app] do
run "ln -nfs #{shared_path}/config/.rbenv-version #{release_path}/config/.rbenv-version"
run "cp #{release_path}/public/_maintenance.html #{shared_path}/system/"
run "cd #{release_path}; RAILS_ENV=#{rails_env} bin/rake assets:precompile"
end
desc "remove unused releases."
after "deploy", "deploy:cleanup"
I don't know what to do !
Can somebody help me ?
Thanks a lot !

Answer 1

That is a very old version of Capistrano (2.0.0 is from July 2007, and doesn't support changes in Ruby 1.9/2.0 -- in this case, Ruby 1.9 no longer allowed using instance variables as arguments to blocks).
You'll need to upgrade to the newest 2.x release (2.15.5).
You could also upgrade to Capistrano v3, but keep in mind it was a complete rewrite and your existing configuration will not be compatible with v3 without some work.