capistrano v2 not failing / rolling back when custom task fails - capistrano

Question

i have to compile a custom c coded binary used by our rails app.
this setup is held in a custom rake file (ourapp.rake, below)
running cap v2 i noticed the make was failing but the deploy didn't "fail".
i since just made the task
system "cd #{thedir} && exit 1" # simulate failing of custom task
but the deploy:cold doesn't fail, the debug output (below) clearly shows make failing
am i missing something? i've tried
searching for error codes/failing scenario of capistrano - nothing (lots of mentions of trying to run custom scripts on failing)
system v run v invoke
help appreciated, code below
# ourapp.rake
namespace :ourapp do
desc "Compile and Install Performant Parser"
task :compile_performant_parser do
thedir=File.join(Rails.root, 'parser')
system "cd #{thedir} && make clean && make && make install"
end # compile
desc "Compile and Install Compareplans process"
task :compile_binary do
thedir=File.join(Rails.root, 'compareplans_process/src')
#system "cd #{thedir} && make clean && make && make install"
system "exit 1"
end # compile
task :install => [:compile_performant_parser, :compile_binary ] do
puts "Preparing Ourapp for run"
end
end
additions to deploy.rb
namespace :deploy do
desc "setup ourapp dependencies, dir, binaries and (later data)"
task :setup_ourapp do
run "cd #{current_release} && /usr/bin/env bundle exec rake our app:install RAILS_ENV=#{rails_env}"
end
after 'deploy:update_code', 'deploy:setup_ourapp'
end

Answer 1

so i figured out that capistrano does not exit, so you need to test the error code
Capistrano run local command exit on failure
and to rollback you need to use a transaction type
How do I use transactions within custom capistrano tasks?