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# Standard tasks that are useful for most recipes. It makes a few assumptions:
#
# * The :app role has been defined as the set of machines consisting of the
# application servers.
# * The :web role has been defined as the set of machines consisting of the
# web servers.
# * The Rails spinner and reaper scripts are being used to manage the FCGI
# processes.
# * There is a script in script/ called "reap" that restarts the FCGI processes
desc "Enumerate and describe every available task."
task :show_tasks do
keys = tasks.keys.sort_by { |a| a.to_s }
longest = keys.inject(0) { |len,key| key.to_s.length > len ? key.to_s.length : len } + 2
puts "Available tasks"
puts "---------------"
tasks.keys.sort_by { |a| a.to_s }.each do |key|
desc = (tasks[key].options[:desc] || "").strip.split(/\r?\n/)
puts "%-#{longest}s %s" % [key, desc.shift]
puts "%#{longest}s %s" % ["", desc.shift] until desc.empty?
puts
end
end
desc "Set up the expected application directory structure on all boxes"
task :setup do
run <<-CMD
mkdir -p -m 775 #{releases_path} #{shared_path}/system &&
mkdir -p -m 777 #{shared_path}/log
CMD
end
desc <<DESC
Disable the web server by writing a "maintenance.html" file to the web
servers. The servers must be configured to detect the presence of this file,
and if it is present, always display it instead of performing the request.
DESC
task :disable_web, :roles => :web do
on_rollback { delete "#{shared_path}/system/maintenance.html" }
maintenance = render("maintenance", :deadline => ENV['UNTIL'],
:reason => ENV['REASON'])
put maintenance, "#{shared_path}/system/maintenance.html", :mode => 0644
end
desc %(Re-enable the web server by deleting any "maintenance.html" file.)
task :enable_web, :roles => :web do
delete "#{shared_path}/system/maintenance.html"
end
desc <<DESC
Update all servers with the latest release of the source code. All this does
is do a checkout (as defined by the selected scm module).
DESC
task :update_code do
on_rollback { delete release_path, :recursive => true }
source.checkout(self)
run <<-CMD
rm -rf #{release_path}/log #{release_path}/public/system &&
ln -nfs #{shared_path}/log #{release_path}/log &&
ln -nfs #{shared_path}/system #{release_path}/public/system
CMD
end
desc <<DESC
Rollback the latest checked-out version to the previous one by fixing the
symlinks and deleting the current release from all servers.
DESC
task :rollback_code do
if releases.length < 2
raise "could not rollback the code because there is no prior release"
else
run <<-CMD
ln -nfs #{previous_release} #{current_path} &&
rm -rf #{current_release}
CMD
end
end
desc <<DESC
Update the 'current' symlink to point to the latest version of
the application's code.
DESC
task :symlink do
on_rollback { run "ln -nfs #{previous_release} #{current_path}" }
run "ln -nfs #{current_release} #{current_path}"
end
desc "Restart the FCGI processes on the app server."
task :restart, :roles => :app do
sudo "#{current_path}/script/reap"
end
desc <<DESC
Run the migrate task in the version of the app indicated by the 'current'
symlink. This means you should not invoke this task until the symlink has
been updated to the most recent version.
DESC
task :migrate, :roles => :db, :only => { :primary => true } do
run "cd #{current_path} && rake RAILS_ENV=production migrate"
end
desc <<DESC
A macro-task that updates the code, fixes the symlink, and restarts the
application servers.
DESC
task :deploy do
transaction do
update_code
symlink
end
restart
end
desc "A macro-task that rolls back the code and restarts the application servers."
task :rollback do
rollback_code
restart
end
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