It works

lib/mina/reboot.rb

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+require "mina/reboot/version"
+require "mina/reboot/save_startup_script"

lib/mina/reboot/save_startup_script.rb

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+require 'rake'
+
+namespace :reboot do
+  task :save_startup_script do
+    unless settings.on_reboot?
+      queue %| echo "-----> No reboot commands given" |
+      next
+    end
+
+    script_path = "#{deploy_to}/#{shared_path}/startup.sh"
+    log_path = "#{deploy_to}/#{shared_path}/startup.log"
+
+    script = "#!/bin/bash\n"
+    crontab_task = "@reboot #{script_path} > #{log_path} #minareboot"
+
+    isolate do
+      fetch(:on_reboot).call
+      script << commands.join(" && \\\n")
+    end
+
+    queue  %| echo "-----> Updating startup script" |
+    queue! %| echo '#{script}' > #{script_path} |
+    queue! %| chmod +x #{script_path} |
+
+    queue  %| echo "-----> Updating @reboot cron task" |
+    queue! %| [[ $(crontab -l) != *minareboot* ]] && cat <(crontab -l) <(echo "#{crontab_task}") \| crontab - \|\| true |
+  end
+end

lib/mina/reboot/version.rb

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+module MinaReboot
+  VERSION = "0.1.0"
+end