Release notes for WeBWorK 2.13

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                                     WeBWorK                                    
                         Online Homework Delivery System                        
                                  Version 2.13                          

                    Copyright 2000-2017, The WeBWorK Project                    
                              All rights reserved.                              

Details
-------

Prerelease date: July 8, 2017 -- the advanced beta version of 2.13 is currently on github

Release date: July 25, 2017

Github repository:  https://github.com/openwebwork
Modules:    webwork2   pg   ww_install

Cautions

WARNING: It is likely that new modules will be required since the release 2.12. There are also changes to the configuration files which will need to be integrated into your existing configurations.

In particular we have switched the CPAN module for sending mail from Mail::Sender to Email::Sender since the former has been deprecated for some time and the latter is the recommended perl module to use for this purpose.

This will be an invisible change for the end user, and in many cases, except for an easy configuration change in site.conf, it will be invisible to the installer as well. In some cases some fiddling with configuration parameters may be required to get the local SMTP site and the WeBWorK site to talk to each other.

The process for upgrading to 2.13 is described below. This assumes that you have been using release 2.12 or some other recent release that you installed using git from the github.com repository.

If you are setting up WeBWorK for the very first time you will probably want help with directory structure, permissions (always a hassle) and installing infrastructure tools. There is a collection of installation manuals of which I recommend Installation_Manual_for_2.12_on_Ubuntu_16.04 as the most up-to-date. There are only slight differences between the instructions for the recent releases of WeBWorK and the directions are quite similar for the different flavors of unix. The directory names may sometimes be different but a google search can help clarify how to translate instructions from one OS to another.

Once you get to the section in the manual where the WeBWorK and PG software is being installed you can refer to the instructions below. Let's get started:

Upgrade Instructions

1) Go to /opt/webwork/webwork2 

>git branch
* develop
  master

>sudo git branch -t rel2.13 origin/master
Branch rel2.13 set up to track remote branch master from origin.

>sudo git checkout rel2.13
error: You have local changes to 'lib/WeBWorK/ContentGenerator/Feedback.pm'; cannot switch branches.
 #### this means that you have made local changes you might want to save.  Use `git stash` or `git commit` or just move the file to safe place.

>sudo git checkout -f rel2.13   # the `f` forces the change and overwrites the file if you didn't move it.
Switched to branch 'rel2.13'

>sudo git pull
 .... long list of updated files

2) Now go to /opt/webwork/pg and run 

>git branch
* develop
  master

>sudo git branch -t rel2.13 origin/master
Branch rel2.13 set up to track remote branch master from origin.

>sudo git checkout rel2.13
Switched to branch 'rel2.13'



>sudo git pull
 .... long list of updated files

The -t flag has your branch "track" the version of master at the origin site. If there are updates on github.com/webwork2 to the master branch a simple sudo git pull will update your local directory.


3) Depending on your system there may be new perl modules which have been added since 2.12. Run check_modules.pl and look for missing modules. They may include: 

  cd /opt/webwork/webwork2/bin
 ./check_modules.pl
   ** Digest::SHA not found in @INC
   ** Email::Sender not found in @INC
   ** Data::Dump not found in @INC
      cpan HTML::Scrubber found and loaded

   ** Statistics::R::IO not found in @INC

In this case the first two modules are missing. You will need to install them with 

   sudo cpan Digest::SHA

and so forth.

You should also run 

  cd /opt/webwork/webwork2/bin
 pdflatex check_latex.tex

and look for missing latex packages. They may include:

  • fullpage.sty
  • preview.sty

If you are missing fullpage it is in the texlive-latex-extra package in apt based distributions and texlive-preprint in yum/dnf distributions.

Configuration file update

4) (new in 2.13 ) Check site.conf.dist and transfer new configuration options over to site.conf. In particular the section which configures the mail features of WeBWorK have changed. $tls_allow=1; should be commented out and replaced by $mail{tls_allow}=0;. There are more detailed instructions in the new site.conf.dist file 

 cd /opt/webwork/webwork2/conf
 diff site.conf site.conf.dist | less

Most of the differences occur when you have filled in local site urls and path ways. These do not need to be changed. You want to look in the mail section where the configuration variable $tls_allowed=1 has been removed and replaced by $mail{tls_allowed}=0. The zero setting means that ssl (or tls) is not used and this is usually the best configuration to start with. If the local smtp server requires ssl then you will need to set this variable to 1. Consult with your local IT people or whoever runs the mail server for help on this. 

< $tls_allowed = 0;
---
> $mail{tls_allowed} = 0;
> #$tls_alowed=0;  #old method -- this variable no longer works.
>
> # errors of the form
> #  unable to establish SMTP connection to smtp-gw.rochester.edu port 465
> # indicate that there is a mismatch between the port number and the use of ssl
> # use port 25 when ssl is off and use port 465 when ssl is on (tls_allowed=1)
>
>
> # Set the SMTP port manually.  Typically this does not need to be done. 
> # port 25 is used if no SSL is on and 465 if ssl is on
>
> #$mail{smtpPort} = 25;


5) Check localOverrides.conf.dist and look for changes to add to the existing localOverrides.conf.

  • (new in 2.12) Library Statistics - This is a new feature (see below). There are variables which control whether or not global and local problem statistics are shown in the library browser.
# These flags control if statistics on opl problems are shown in the library
# browser.  If you want to include local statistics you will need to
# run webwork2/bin/update-OPL-statistics on a regular basis.  
$problemLibrary{showLibraryLocalStats} = 1;
# This flag controls whether global statistics will be displayed
$problemLibrary{showLibraryGlobalStats} = 1;
  • (new in 2.12) Problem Re-Randomization - The problem rerandomization feature (see below) has default options which need to be set.
# The default prPeriod value (re-randomization period) to use for the newly created problem.
# It is suggested to use the value of -1, which means that the course-wide setting would be used
# Setting this to -1 defaults to the use of course-wide settings (suggested)
# Setting this to 0 disables periodic randomization regardless of the course-wide setting
# Setting this to a positive value will override the course-wide setting
$problemDefaults{prPeriod} = -1;

################################################################################
# Periodic re-randomization
################################################################################
# switch to enable periodic re-randomization
$pg{options}{enablePeriodicRandomization} = 0;
# course-wide default period for re-randomization, should be an integer
# the value of 0 disables re-randomization
$pg{options}{periodicRandomizationPeriod} = 5;

6) (new in 2.12 and 2.13) Check your apache configuration file (e.g. webwork.apache24-config)and look for changes to add to your existing configuration file. If you are updating from 2.12 you probably will not need to make any changes. If you are updating from an older version you may need to add the following:

  • Code to set the location of the pg directory as an environment variable
$WeBWorK::Constants::PG_DIRECTORY = $pg_dir;
$ENV{PG_ROOT} = $pg_dir;
  • A line to set the server admin email
$ENV{WEBWORK_SERVER_ADMIN} = $webwork_server_admin_email;
  • There are additional print statements and a "warn" statement in that will report information about your settings.

It will warn you if you have a mismatch between the correct port and the chosen protocol (whether to use 

ssl (a.k.a tls) to contact the smtp server). To begin assume that ssl will not be needed and will

not be used in contacting the smtp server.

Update course files from courses.dist

7) Check your courses.dist/modelCourse/course.conf and look for changes against your course.conf files. They may include:

  • Removing a number of outdated settings.
  • Commented out settings for controlling which instructors can see which students.
# The following hashes control which users are allowed to see students from which
# sections.  This is typically  used for large multi-section classes with many students, ta's and
# professors.  When set users will only be allowed to see students from the appropriate section in the following:
# -  Instructor Tools
# -  Student Progress
# -  Email
# -  Problem Grader
# -  Show Answers
# They will be able to see students from other sections on other pages.  
# These variables generally should be set here and not in defaults.conf.

# $viewable_sections = { user_id1 => [1 ,2 ,3] , # list of viewable sections for user_id1
#		       user_id2 => [1],
#		     };

# $viewable_recitations = { user_id1 => [1 ,2 ,3] , # list of viewable recitations for user_id1
#			  user_id2 => [1],
#		     };

Restart the apache server

8) Restart the webserver. 

sudo apachectl restart

Upgrade the admin course, MathJax and the OPL

9) Run the upgrade admin database script. You will not be able to access your admin course until this is done, and you will need to do that to upgrade the course databases. 

upgrade_admin_db.pl

Next, log into the admin course and upgrade the databases for all of your courses. Your server will not be functional until you perform this step.

10) Download the latest version of the OPL. Note: If you have library statistics enabled this will also update your statistics tables. 

cd /opt/webwork/libraries/webwork-open-problem-library
git pull origin
/opt/webwork/webwork2/bin/OPL-update

11) Download the latest version of MathJax. 

cd /opt/webwork/MathJax
git pull

12)

Construction.png This article is under construction. Use the information herein with caution until this message is removed.

New Features

  • R server

Version 2.13 of WeBWorK has the built-in capability of running R code. One can write problems in PG that calls R to be run on a rserve (R server). To determine how to set this up as well as call R code, see R_in_WeBWorK.

Features from release 2.12

  • LTI Grade Passback: This is a complete rewrite of the LTI authentication module including upgrades to allow grades to be passed back from WeBWorK to the LMS (e.g. Blackboard, Moodle, etc...). The authentication feature includes the ability to automatically create students logging into WeBWorK for the first time. The grading feature has two modes. You can either have WeBWorK pass back a single "homework" grade for the entire course, or you can set it up on a set by set basis. You can read more about this module at the following links. Note: The new LTIAdvanced module not a strict upgrade from the older LTI authentication module LTIBasic. The older module still works, but should be considered legacy code.
  • Hardcopy Themes: This adds support for different hardcopy themes. Instructors will set the theme that students have access to on the Course Configuration page, and can also select the different themes on the instructor download handouts page. Right now there are two themes: the traditional two column WeBWorK theme and a new "one column" theme which the full page width. The system is also set up so that universities can add their own themes for tests or with branding. Note: You will need to make sure the fullpage latex package is available on your server to use this feature.
  • Past Answer Refactor: This is a rewrite of the existing Past Answer's page. First, it replaces the old "wildcard/regex" feature in Past Answers with multiselect lists. Now instructors will explicitly select which sets, users and problems they would like to search for past answers. It also adds the ability to download answers from the Past Answer page as a CSV.
  • OPL Statistics: This adds problem usage statistics to the Library Browser. When enabled and configured you should see both local and 'global' statistics on how many times problems have been assigned, students average scores and, average attempt numbers. Here local statistics are generated from the data on your WeBWorK server and reflects how your courses use problems. Global statistics are generated from over a dozen different universities and includes information on 23000 problems.
  • Translator Refactor: This is an extensive under the hood revamping of how PG tracks problem resources, aliases, answer blanks and evaluators. In general the new approach uses less "dead reckoning" and is smarter about treating answer blanks and evaluators as different components of the same "object". You should not see any changes in functionality.
  • Advanced Problem Debugging: Users with admin privileges will have the ability to see detailed debugging information about problems. There are four options available. AnswerGroupInfo shows information about answer "groups". This is most helpful for multianswer style problems. Show Auxiliary Resources shows information about auxiliary files used by the problem. AnswerHashInfo shows information about the answer hash, including answers, filters and evaluators. PGInfo prints the PG environment, including all available variables.
  • Periodic Randomization: This feature allows you to force problems to generate a new seed after a fixed number of attempts. It is sort of "max attempts lite" in that students can keep trying, but they have to start over. The feature is enabled via the Course Configuration page (in the Optional Modules section). Instructors can set the default number of attempts before re-randomization. The number of attempts before re-randomization can also be set on a per problem basis.
  • parserWordCompletion: This new macro allows authors to ask free response fill in the blank questions with interactive help. As a student types their answer into the answer blank, jQuery's autocomplete feature generates a drop-down list of allowable answers that match what has already been typed.
  • Grades: The Grades page was overhauled with an number of small modifications. The total percentage score for homeworks is now shown and the "C" has been replaced by a 100. There is also a course homework grade at the bottom of the Grades table. This score is generated from the total number of points earned divided by the total number of points available and should match the score generated by selecting all sets on the Scoring Tools page. (This can be turned off on the Course Configuration page if WeBWorK's grading scheme doesn't match with what you use.)

Smaller Changes

Installer

The ww_install installer has been updated to support version 2.12. It has been tested on all of the distributions listed below. The installer has also been refactored to be more modular when it comes to different distributions. If you are interested in modifying the installer to work with your distribution post an issue on the ww_install github. You can read more about it at WeBWorK Installer Guide

Supported Distributions

The following are the distributions and features that are officially still supported. They have all been tested with the webwork installer. You still can use WeBWorK on whatever you like, of course. In particular if you install WeBWorK on a very recent version of Ubuntu or Fedora and have problems let us know.

  • Ubuntu 15.10
  • Ubuntu 16.04 (LTS)
  • Debian 8
  • CentOS 7
  • Fedora 22
  • Fedora 23

What could possibly go wrong?

  • I cannot access the admin course. This could be because you have not run upgrade_admin_db.pl yet.
  • I cannot generate a "one column" hardcopy. You may be missing the fullpage latex package. In apt based systems its part of the package texlive-latex-extra and in yum/dnf based systems its part of texlive-preprint
  • I see little vertical lines next to MathJax rendered formulas. This is caused by an incompatibility between older versions of MathJax and Chrome. Update MathJax with cd /opt/webwork/MathJax and git pull to fix the problem.
  • I do not see links to some of the editors in the Main Menu, including the links to Problem Set Detail 2, or I get an error about "SimplePGEditor". To fix this remove the definition of the %showeditors from localOverrides.conf. This hash should be defined in defaults.config and if you want to change things in localOverrides.conf you should set hash elements individually.
  • I can't get LTI to work. First make sure that you are using the new version of LTI. (Make a fresh copy of authen_LTI.conf from the distribution file.) Also enable the $debug_lti_parameters flag. For security reasons the default error messages from the LTI module are very vague.
  • I dont see the Library Statistics. Make sure that you have enable the appropriate flags in localOverrides.conf (see the first section of this page) and run OPL-update
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