## WeBWorK Problems

### Re: Where to put Custom Problems

by Alex Jordan -
Number of replies: 0
> Wow, a little overwhelmed.....but I think it makes sense.
> Part of my trouble is that I can not find an explanation about what structure exists on the server and what / how all the folders are used.

Yes, sorry, but I'm not sure this level of customization is explained anywhere. I sort of figured it out after having to get involved with troubleshooting our server's initial installation. Nothing like getting your hands dirty like that to learn how things really work.

> I don't really understand what the opt directory contains, or what the difference between the webwork and webwork2 folders are.
> Is the opt/webwork folder a folder you created or does that already exist on the server? If already existing, what is its stated purpose? I understand how to create the additional folders underneath this.

I think /opt is just a standard folder on Linux-based systems. It is a place for programs like WeBWorK (which fall in a certain technical category) to be installed. When WeBWorK was installed on your server, that's when /opt/webwork was created. It is just a folder for holding at least four WeBWorK components that work together. One of these three is webwork2, the core engine for the web interface and interacting with the database. It is "2" because this is all WeBWorK version 2. Other folders in /opt/webwork include pg (the engine for processing problem code), mathjax (for rendering math on the web), and libraries (where problem libraries are stored). Right now, your libraries folder probably only has the OPL, which lives in a subfolder called webwork-open-problem-library. But the last post discussed adding a new library inside libraries.

> Glad you knew about that localOverrides.conf file....and adding the libraries makes sense the way you explained it but how you know that is beyond me based on what documentation I've found so far.

Yes, I sympathize. I guess most users have been content not to customize this much. The few who know what to do have found it difficult to maintain comprehensive documentation. In the meantime, I/we try to help in the forums like this.

We did try to get funding several times recently to commit someone to putting together solid documentation for WeBWorK. But no bites. Maybe we are still trying.

> Where I get a little lost is on creating a "symlink"...I am still pretty new to unix but it seems like it is a "pointer" to another location/file. so I interpret the ln -s... line as creating a symlink that points to the BasicMath directory and is called BasicMath. But where is this link being created? I assume in the current folder. If that is right then it makes sense that I do this in each course's template directory as you suggested with the loops.

Sounds like you got it. What you are creating sort of looks like a file called "BasicMath" (or whatever). Except it behaves more like a folder. You can "cd" (change directories) into it. But you aren't really stepping into a folder. You are going to the target of the symlink.

> Are the loops you specified done on a command line or somewhere else? I didn't know I could enter 3 lines like that and have it do something.

Command line. With typical commands, hitting Enter causes them to execute. But in that example, the for each is waiting for the done before anything happens. I am *not* a Linux shell script expert by any means. I just lifted this from here: http://webwork.maa.org/wiki/CVS_Access_to_Problem_Libraries#How_do_I_connect_a_problem_library_to_an_existing_WeBWorK_course.3F

> It appears that the loops would work for existing courses that we have created, as well as the distribution courses, but as new courses are added the symlink would need to be created manually....is this right?

Whenever I create a new course, there is some already-existing course whose templates folder gets copied. (I'm actually not aware of any other way to create new course, although I wouldn't be surprised if there is a way.) So the new courses get the symlinks because they were there in whatever course you are cloning. Maybe you are cloning the model course that comes with the distribution. What we have done here is to create bare bones course shells for the various classes we run, and those is what I clone to give someone a new course shell.

> Thanks.

No problem, happy to help and pay it forward.