Simple Jenkins CI build testing with Unity.

Lately, I've been very interested in automating daily builds for some larger personal projects. So I added a Jenkins setup to my home server to act as a Build Server for Unity CI (Continuous Integration).

There's a fair bit of documentation about how to do this online, but it was useful to have a dummy project like this to mess with.

Basically, this has two parts:

• a BuildScript.cs that needs to go somewhere inside a Unity project in an Editor folder
• a BuildScriptSettings.ini or .txt that needs to go somewhere inside a Unity project in a Resources folder

They've been packaged together into a handy "BuildScript" folder.

Put the BuildScript folder into your project, and configure the settings text file as needed. If you need a build that isn't available, use the existing "PerformXXXBuild" methods as a template to add a new build target.

Then, configure your Jenkins instance with the Unity3D plugin, and set it to run Unity from the command line and call these methods. An example might be "-quit -batchmode -executeMethod BuildScript.PerformWinBuild" appended to the end of the Unity command line call.

This was done following https://conquertheworldbycode.wordpress.com/2013/11/03/unity3d-jenkins-setup/ almost to the letter, and then expanding on the BuildScript a bit to add more flexibility.

I had some huge problems getting this to work. The biggest challenges came when I was trying to enable the BuildScriptSettings read from Resources; I thought for the longest time that I was doing something that simply wasn't possible during a Unity Build. The documentation about what can and can't be done during the build process is somewhat hard to find, and it was a bit confusing for me to figure out what was actually causing my problems. It turns out that the error was caused by a very minor thing - I had a FunctionTesting.cs script extending MonoBehaviour that I was using to test out the methods that would actually load the name and filepath. But this script was using some methods from UnityEditor; it wasn't in an Editor folder.

Logically, I had assumed that it wouldn't make a difference - that the UnityEditor related bits would be compiled out. It "made sense" to me that this Component script wouldn't be in an Editor folder. But instead, it caused build errors, despite never throwing any warnings during normal build and play testing the way that one would expect.

TL;DR: always put any script with "using UnityEditor" into an Editor folder, or you can have silent errors during the build process!