Remove packages that were not present when the device was connected.

lib/units/device/index.js

@@ -30,6 +30,7 @@ module.exports = function(options) {
         .dependency(require('./plugins/install'))
         .dependency(require('./plugins/forward'))
         .dependency(require('./plugins/group'))
+        .dependency(require('./plugins/cleanup'))
         .dependency(require('./plugins/reboot'))
         .dependency(require('./plugins/connect'))
         .dependency(require('./plugins/data'))

lib/units/device/plugins/cleanup.js

@@ -0,0 +1,46 @@
+var syrup = require('stf-syrup')
+var Promise = require('bluebird')
+var _ = require('lodash')
+
+var logger = require('../../../util/logger')
+
+module.exports = syrup.serial()
+  .dependency(require('../support/adb'))
+  .dependency(require('../resources/service'))
+  .dependency(require('./group'))
+  .define(function(options, adb, service, group) {
+    var log = logger.createLogger('device:plugins:cleanup')
+    var plugin = Object.create(null)
+
+    function listPackages() {
+      return adb.getPackages(options.serial)
+    }
+
+    function uninstallPackage(pkg) {
+      log.info('Cleaning up package "%s"', pkg)
+      return adb.uninstall(options.serial, pkg)
+        .catch(function(err) {
+          log.warn('Unable to clean up package "%s"', pkg, err)
+          return true
+        })
+    }
+
+    return listPackages()
+      .then(function(initialPackages) {
+        initialPackages.push(service.pkg)
+
+        plugin.removePackages = function() {
+          return listPackages()
+            .then(function(currentPackages) {
+              var remove = _.difference(currentPackages, initialPackages)
+              return Promise.map(remove, uninstallPackage)
+            })
+        }
+
+        group.on('leave', function() {
+          plugin.removePackages()
+        })
+
+      })
+      .return(plugin)
+  })