feat(volumes): check if volumes are used in service definitions (#1601)

app/components/volumes/volumesController.js

@@ -1,6 +1,6 @@
 angular.module('volumes', [])
-.controller('VolumesController', ['$q', '$scope', '$state', 'VolumeService', 'Notifications',
-function ($q, $scope, $state, VolumeService, Notifications) {
+.controller('VolumesController', ['$q', '$scope', '$state', 'VolumeService', 'ServiceService', 'VolumeHelper', 'Notifications',
+function ($q, $scope, $state, VolumeService, ServiceService, VolumeHelper, Notifications) {
 
   $scope.removeAction = function (selectedItems) {
     var actionCount = selectedItems.length;
@@ -24,16 +24,24 @@ function ($q, $scope, $state, VolumeService, Notifications) {
   };
 
   function initView() {
+    var endpointProvider = $scope.applicationState.endpoint.mode.provider;
+    var endpointRole = $scope.applicationState.endpoint.mode.role;
+
     $q.all({
       attached: VolumeService.volumes({ filters: { 'dangling': ['false'] } }),
-      dangling: VolumeService.volumes({ filters: { 'dangling': ['true'] } })
+      dangling: VolumeService.volumes({ filters: { 'dangling': ['true'] } }),
+      services: endpointProvider === 'DOCKER_SWARM_MODE' && endpointRole === 'MANAGER' ? ServiceService.services() : []
     })
     .then(function success(data) {
+      var services = data.services;
       $scope.volumes = data.attached.map(function(volume) {
         volume.dangling = false;
         return volume;
       }).concat(data.dangling.map(function(volume) {
         volume.dangling = true;
+        if (VolumeHelper.isVolumeUsedByAService(volume, services)) {
+          volume.dangling = false;
+        }
         return volume;
       }));
     }).catch(function error(err) {

app/helpers/volumeHelper.js

@@ -11,5 +11,20 @@ angular.module('portainer.helpers')
     return options;
   };
 
+  helper.isVolumeUsedByAService = function(volume, services) {
+    for (var i = 0; i < services.length; i++) {
+      var service = services[i];
+      var mounts = service.Mounts;
+      for (var j = 0; j < mounts.length; j++) {
+        var mount = mounts[j];
+        if (mount.Source === volume.Id) {
+          return true;
+        }
+      }
+    }
+
+    return false;
+  };
+
   return helper;
 }]);