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Capistrano enhancements

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* Use fetch(:variable) to avoid collisions with namespaces
* Default :whenever_environment to the :rails_env variable
* Document the Capistrano tasks
* Apply whenever_roles at runtime so the variable can be set after the recipe is loaded
* Add transaction rollback support to the update_crontab task
This commit is contained in:
Chris Griego 2011-05-24 23:54:34 -05:00
parent 1214114c40
commit 98ae96a2af
1 changed files with 48 additions and 18 deletions
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66
lib/whenever/capistrano.rb
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@ -1,32 +1,62 @@
Capistrano::Configuration.instance(:must_exist).load do
_cset(:whenever_roles) { :db }
_cset(:whenever_command) { "whenever" }
_cset(:whenever_identifier) { application }
_cset(:whenever_environment) { "production" }
_cset(:whenever_update_flags) { "--update-crontab #{whenever_identifier} --set environment=#{whenever_environment}" }
_cset(:whenever_clear_flags) { "--clear-crontab #{whenever_identifier}" }
_cset(:whenever_identifier) { fetch :application }
_cset(:whenever_environment) { fetch :rails_env, "production" }
_cset(:whenever_update_flags) { "--update-crontab #{fetch :whenever_identifier} --set environment=#{fetch :whenever_environment}" }
_cset(:whenever_clear_flags) { "--clear-crontab #{fetch :whenever_identifier}" }
# Disable cron jobs at the begining of a deploy.
after "deploy:update_code", "whenever:clear_crontab"
# Write the new cron jobs near the end.
after "deploy:symlink", "whenever:update_crontab"
# If anything goes wrong, undo.
after "deploy:rollback", "whenever:update_crontab"
namespace :whenever do
desc "Update application's crontab entries using Whenever"
task :update_crontab, :roles => whenever_roles do
# Hack by Jamis to skip a task if the role has no servers defined. http://tinyurl.com/ckjgnz
next if find_servers_for_task(current_task).empty?
run "cd #{current_path} && #{whenever_command} #{whenever_update_flags}"
desc <<-DESC
Update application's crontab entries using Whenever. You can configure \
the command used to invoke Whenever by setting the :whenever_command \
variable, which can be used with Bundler to set the command to \
"bundle exec whenever". You can configure the identifier used by setting \
the :whenever_identifier variable, which defaults to the same value configured \
for the :application variable. You can configure the environment by setting \
the :whenever_environment variable, which defaults to the same value \
configured for the :rails_env variable which itself defaults to "production". \
Finally, you can completely override all arguments to the Whenever command \
by setting the :whenever_update_flags variable. Additionally you can configure \
which servers the crontab is updated on by setting the :whenever_roles variable.
DESC
task :update_crontab do
options = { :roles => fetch(:whenever_roles) }
if find_servers(options).any?
on_rollback do
if fetch :previous_release
run "cd #{fetch :previous_release} && #{fetch :whenever_command} #{fetch :whenever_update_flags}", options
else
run "cd #{fetch :release_path} && #{fetch :whenever_command} #{fetch :whenever_clear_flags}", options
end
end
run "cd #{fetch :current_path} && #{fetch :whenever_command} #{fetch :whenever_update_flags}", options
end
end
desc "Clear application's crontab entries using Whenever"
task :clear_crontab, :roles => whenever_roles do
next if find_servers_for_task(current_task).empty?
run "cd #{release_path} && #{whenever_command} #{whenever_clear_flags}"
desc <<-DESC
Clear application's crontab entries using Whenever. You can configure \
the command used to invoke Whenever by setting the :whenever_command \
variable, which can be used with Bundler to set the command to \
"bundle exec whenever". You can configure the identifier used by setting \
the :whenever_identifier variable, which defaults to the same value configured \
for the :application variable. Finally, you can completely override all \
arguments to the Whenever command by setting the :whenever_clear_flags variable. \
Additionally you can configure which servers the crontab is cleared on by setting \
the :whenever_roles variable.
DESC
task :clear_crontab do
options = { :roles => whenever_roles }
run "cd #{fetch :release_path} && #{fetch :whenever_command} #{fetch :whenever_clear_flags}", options if find_servers(options).any?
end
end
end
end