portainer/app/docker/services/execService.js

angular.module('portainer.docker')
.factory('ExecService', ['$q', '$timeout', 'Exec', function ExecServiceFactory($q, $timeout, Exec) {
  'use strict';
  var service = {};

  service.resizeTTY = function(execId, height, width, timeout) {
    var deferred = $q.defer();

    $timeout(function() {
      Exec.resize({}, { id: execId, height: height, width: width }).$promise
      .then(function success(data) {
        if (data.message) {
          deferred.reject({ msg: 'Unable to exec into container', err: data.message });
        } else {
          deferred.resolve(data);
        }
      })
      .catch(function error(err) {
        deferred.reject({ msg: 'Unable to exec into container', err: err });
      });
    }, timeout);

    return deferred.promise;
  };

  return service;
}]);