capistrano deploy: let the user choose if running svc and svstat with sudo

Set svc_sudo to true in deploy_config.yml to use sudo.
The default value will be false, so that if the parameter is missing capistrano will behave exactly as before.

config/deploy.rb

@@ -46,7 +46,7 @@ namespace :deploy do
   end
 
   task :restart do
-    thins = capture "svstat /service/thin*"
+    thins = capture_svstat "/service/thin*"
     matches = thins.match(/(thin_\d+):/).captures
 
     matches.each_with_index do |thin, index|
@@ -54,25 +54,25 @@ namespace :deploy do
         puts "sleeping for 20 seconds"
         sleep(20)
       end
-      run "svc -t /service/#{thin}"
+      svc "-t /service/#{thin}"
     end
 
-    run "svc -t /service/resque_worker*"
+    svc "-t /service/resque_worker*"
   end
 
   task :kill do
-    run "svc -k /service/thin*"
-    run "svc -k /service/resque_worker*"
+    svc "-k /service/thin*"
+    svc "-k /service/resque_worker*"
   end
 
   task :start do
-    run "svc -u /service/thin*"
-    run "svc -u /service/resque_worker*"
+    svc "-u /service/thin*"
+    svc "-u /service/resque_worker*"
   end
 
   task :stop do
-    run "svc -d /service/thin*"
-    run "svc -d /service/resque_worker*"
+    svc "-d /service/thin*"
+    svc "-d /service/resque_worker*"
   end
 
   desc 'Copy resque-web assets to public folder'
@@ -93,3 +93,16 @@ after 'deploy:symlink' do
   deploy.copy_resque_assets
 end
 
+
+def maybe_sudo(cmd)
+  "#{svc_sudo ? sudo : ''} #{cmd}"
+end
+
+def svc(opts)
+  run(maybe_sudo("svc #{opts}"))
+end
+
+def capture_svstat(opts)
+  capture(maybe_sudo("svstat #{opts}"))
+end
+

config/deploy/production.rb

@@ -12,3 +12,6 @@ if config['branch']
 end
 set :repository, config['repo']
 server config['server'], :app, :web, :db, :primary => true
+set :svc_sudo, (config['svc_sudo'] || false)
+default_run_options[:pty] = true if svc_sudo
+

config/deploy/staging.rb

@@ -12,3 +12,6 @@ if config['branch']
 end
 set :repository, config['repo']
 server config['server'], :app, :web, :db, :primary => true
+set :svc_sudo, (config['svc_sudo'] || false)
+default_run_options[:pty] = true if svc_sudo
+

config/deploy_config.yml.example

@@ -10,6 +10,8 @@ production:
   password: 'password'
   rails_env: 'production'
   repo: 'git://github.com/diaspora/diaspora.git'
+  #set svc_sudo to true if you want to run scv and svstat with sudo. default: false
+  svc_sudo: false
 staging:
   server: 'staging.example.com'
   deploy_to: '/var/www/diaspora'
@@ -18,3 +20,4 @@ staging:
   password: 'password'
   rails_env: 'staging'
   repo: 'git://github.com/diaspora/diaspora.git'
+  svc_sudo: false