Separate device functionality into plugins.

lib/roles/device/plugins/quit.js

@@ -0,0 +1,38 @@
+var Promise = require('bluebird')
+var syrup = require('syrup')
+
+var logger = require('../../../util/logger')
+
+module.exports = syrup()
+  .define(function(options) {
+    var log = logger.createLogger('device:plugins:quit')
+    var cleanup = []
+
+    function graceful() {
+      log.info('Winding down for graceful exit')
+
+      var wait = Promise.all(cleanup.map(function(fn) {
+        return fn()
+      }))
+
+      return wait.then(function() {
+        process.exit(0)
+      })
+    }
+
+    function fatal() {
+      log.fatal('Shutting down due to fatal error')
+      process.exit(1)
+    }
+
+    process.on('SIGINT', graceful)
+    process.on('SIGTERM', graceful)
+
+    return {
+      graceful: graceful
+    , fatal: fatal
+    , observe: function(promise) {
+        cleanup.push(promise)
+      }
+    }
+  })