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Check to see if you have changes in head which have not been pushed before deploying

View deploy.rb
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namespace :deploy do
desc "Make sure there is something to deploy"
task :check_revision, :roles => :web do
unless `git rev-parse HEAD` == `git rev-parse origin/master`
puts "WARNING: HEAD is not the same as origin/master"
puts "Run `git push` to sync changes."
exit
end
end
end
before "deploy", "deploy:check_revision"
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