Leeroy is a Windows service that monitors GitHub repositories for changes; when a new commit is detected, it starts a Jenkins build.

Leeroy is designed to work with a “build repository”—a git repository that contains a text file with the current build number, and one or more submodules.

Leeroy monitors a specific branch in each submodule’s repository. When a new commit is pushed to that branch, Leeroy creates a commit in the build repository that updates that submodule; it also increments the current build number. Once the commit it pushed, it makes a HTTP request to Jenkins (or any compatible CI server) to start a build.

Checking for changes and creating new commits is done through the GitHub API, so Leeroy can only work with repositories hosted at github.com or at GitHub Enterprise.

1. Clone the Leeroy repository.
2. Build the code.
3. Copy the Release build output to a folder on your server.
4. Edit Leeroy.exe.config in that folder and ensure the credentials and logging settings are correct.
5. Open an Administrative Command Prompt in that folder.
6. Run C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil.exe Leeroy.exe
7. Run sc start Leeroy to start the service.

Leeroy loads its configuration files from a GitHub repository (and automatically reloads them when the master branch in that repository is updated). The configuration files are stored in the following JSON format:

{
    "buildUrl": "http://SERVER/job/JENKINS-JOB-NAME/build",
    "buildUrls": [ optional array of URLs, if a commit should start
        multiple builds ],
    "repoUrl": "git@SERVER:Build/BUILDREPO.git",
    "branch": "master", /* or branch to build */
    "submoduleBranches": { optional hash, which maps submodule
        paths to the branch to track in that submodule; the default is to
        track the branch given by 'branch' above
    }
}