’ve been knee deep in capistrano lately, and I’ve come across in
interesting behavior:
Say you have the following:
role :app, "app"
role :web, "web"
task :run_on_web, :roles => :web do
do_something_on_server
end
task :run_on_app, :roles => :app do
do_something_on_server
end
task :do_something_on_server do
run "/usr/sbin/something"
end
If you run the run_on_web task, it will execute the
do_something_on_server task using all roles. This isn’t the behavior
you most expected most likely. The secret to making this work is to
set ENV[‘HOSTS’] match your the set of hosts you are interested in.
After you are done you’ll want to set ENV[‘HOSTS’] hosts back to it’s
original contents. I’ve whipped up a quick method to make this even
easier.
def with_role(role, &block)
original, ENV['HOSTS'] = ENV['HOSTS'], find_servers(:roles
=>role).map{|d| d.host}.join(",")
begin
yield
ensure
ENV['HOSTS'] = original
end
end
You can call it like this:
role :app, "app"
role :web, "web"
task :run_on_web, :roles => :web do
with_role :web do
do_something_on_server
end
end
task :run_on_app, :roles => :app do
with_role :app do
do_something_on_server
end
end
task :do_something_on_server do
run "/usr/sbin/something"
end
Hopefully this helps someone.
(also posted here:
http://smartic.us/2008/5/6/keeping-capistrano-in-check-ensuring-roles-are-respected-in-sub-tasks)
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