Isabelle Gets a New Build Manager

Isabelle is a powerful tool used in the world of mathematics and computer science. It helps researchers and developers verify the correctness of proofs. To keep everything running smoothly, the Isabelle platform needed a build manager – a system that assembles various components so they work together without a hitch. You can think of it as a chef preparing a multi-course meal, making sure all the dishes come out at the right time and temperature.

#The Old Way: Jenkins Build Server

For a long time, Isabelle relied on Jenkins as its build manager. Jenkins is a popular tool for continuous integration, which means it helps automate the process of testing and building software. However, like a chef who can't find his favorite spatula, Jenkins had some shortcomings. It struggled to handle user-submitted builds effectively, which meant that it was slow and sometimes unreliable. Jobs would fail unexpectedly, and the whole system slowed down, making users pull their hair out in frustration.

#The Need for Change

With the increasing complexity of the Isabelle platform, sticking with Jenkins was like trying to drive a sports car with a flat tire. The community recognized that they needed a new approach. They wanted something that could handle the unique demands of Isabelle without the headaches caused by the aging Jenkins setup. So, they decided to develop a new build manager using Isabelle’s own programming environment.

#Introducing the New Isabelle Build Manager

The new Isabelle build manager is built entirely within the Isabelle/Scala programming environment. This was a big shift. Instead of relying on an outside tool, they created a system that understands the inner workings of Isabelle.

#The Build Manager Structure

Think of the new build manager as a well-coordinated team of workers in a factory. Each worker has a specific job to do:

1. Poller: This worker listens for updates. When something changes in the Isabelle repository or any extra components, this worker queues up tasks for the necessary jobs.

2. Timer: The timer sets tasks to run at specific times, like a baker setting a timer for a pie in the oven rather than every time someone walks into the bakery.

3. Runner: This worker makes sure to check which tasks are ready to go. If it finds a ready task, it starts that job. If a job takes too long and times out, the runner can interrupt it, just like a teacher who steps in if a student is taking too long to finish a test.

4. Web Server: Think of this as the manager that keeps everyone informed. It provides web pages that display the current state of builds and logs so users can see what’s happening.

#Running a Build

When it comes time to run a build, the process is more organized than ever. The build manager receives tasks that detail what needs to be built. Then, it does a little housekeeping by creating a self-contained copy of Isabelle and its required components. This is like setting up a clean workspace before starting any project.

The actual build runs in four simple steps:

1. The runner gathers everything needed for the build, like shopping for ingredients before cooking.
2. It creates the environment needed for the build and transfers everything into place, like getting the pots and pans ready.
3. The build is run remotely, monitored through a terminal, which allows users to see real-time updates, just like watching a cooking show where you can see everything happening live.
4. After completing the build, the results are recorded, and any necessary cleanup is done.

#Dynamic Web Presence

The new build manager features a user-friendly web interface. This is like having a control panel where you can see all your devices at a glance. Users can check the status of builds, see which ones are running, and even cancel them if needed.

By using static HTML and a little bit of JavaScript, the web server provides a smooth experience without requiring users to download complicated software.

#Submitting Builds

Users can submit their builds similarly to how you'd place an order at a restaurant. They just need to connect to the server via SSH, which is like calling the restaurant and giving your order. The system uses isabelle.Sync to ensure everything is up to date, and once the task is registered, users receive a private link to monitor their orders.

#System Configuration: A Simple Setup

The build manager requires minimal infrastructure. It's like setting up a small kitchen compared to a large restaurant kitchen. Each user has an individual setup with preferences that need configuration, but it’s nothing that requires a degree in rocket science.

#Running Builds in Parallel

The new system also allows for running multiple builds simultaneously. This is like having several chefs in the kitchen, each working on different dishes without getting in each other’s way. While one chef prepares a salad, another can be cooking a steak, allowing for a more efficient process.

#User Interface: Keeping It Simple

The user interface of the new build manager is designed for simplicity. It resembles the old Jenkins layout but provides an updated feel. Users can quickly glance at general statistics, see how many builds are currently running, and access build logs.

With just a few clicks, anyone can see the status of their builds, which sessions have completed, and if anything went wrong along the way. This simplicity is essential because it allows users to focus on their work instead of figuring out how to navigate the system.

#Conclusion: A Fresh Start

The new build manager represents a significant improvement over the old Jenkins system. It streamlines the build process, making it much easier for users to perform their tasks. As the platform continues to evolve, new features can be added to support even more capabilities.

In the future, the build manager aims to make research more reproducible and assist users in managing their data effectively. Scaling resources up and down dynamically could be on the horizon, allowing for optimal use of hardware while keeping the system running smoothly.

With the new build manager in place, the Isabelle community has taken a giant leap toward a more organized and efficient workflow. Who knew building could be so much fun?