MacStadium sponsors GNOME macOS CI infrastructure

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  • Post last modified:April 28, 2025
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Introduction:

GNOME GitLab now uses macOS runners from MacStadium for managing our macOS CI pipeline. This offers significant improvements in supporting the GNOME platform on macOS. In this blog, we’ll cover the event timeline of macOS CI in GNOME GitLab and the technical details of the new infrastructure setup from MacStadium.

Background:

Around mid 2023, the GNOME Infrastructure Team decided to retire the existing macOS CI runners for a handful of reasons as explained in this post by Emmanuele Bassi. They were x86_64 runners which were quite outdated technically, as they were replaced by better and faster Apple Silicon M series ARM SoCs (specifically Apple M1) from Nov 2020.

There was no macOS CI in GNOME GitLab since then. GNOME core projects like GTK, GLib and few apps still provided macOS support on a best effort basis: meaning development and testing would be done on user machines. Though this is far from perfect, this provided some basic macOS support for GNOME projects.

Infrastructure help from René:

René de Hesselle is a member of Inkscape’s Project Leadership Committee and an open source developer who specializes in building, packaging and porting applications to the macOS platform. Looking into the macOS CI issues GNOME projects were facing, René offered to help with the macOS effort in GNOME, which was greatly appreciated by GNOME developers.

René has been assisting core libraries like GLib, GTK and GNOME apps to build in macOS. To address the macOS CI limitation, René went a step further and provided a self hosted GitLab macOS CI runner. With assistance from the GNOME Infrastructure Team, the self hosted runner was made available to projects across GNOME. This proved to be really useful, as it increased the pace of development in macOS.

Scalability and Sustainability Issues:

Over time, as more projects switched to using the self hosted macOS CI runner, it was becoming evident that this solution would not be effective for the scale of GNOME and not sustainable in the long term. René opened this topic for discussion in this post.

It was quite evident that we needed an enterprise solution to offer scalable and sustainable macOS CI service. This is when MacStadium’s FOSS program was highlighted as a possible solution in GNOME Discourse.

MacStadium, FOSS and GNOME:

MacStadium is well known in the open source world for sponsoring developers of open source projects for the Apple platform, including macOS, iOS, tvOS, and watchOS.

The GNOME Team got in touch with MacStadium for sponsoring macOS CI runners under their FOSS program. Though the MacStadium FOSS program was not available as it was already at capacity, MacStadium was excited in partnering with GNOME. Special thanks to Lauren Cabana (Director, Marketing) from MacStadium for actively pursuing this effort and making this collaboration possible.

MacStadium Orka Cluster solution:

As part of this collaboration, MacStadium has offered the following infrastructure setup based on our requirements:

  • Orka (Orchestration with Kubernetes on Apple) Cluster.
  • Dedicated network with firewall and VPN.
  • 1 TB NAS storage.
  • 2 x Mac mini (M1, 8-core CPU, 10-core GPU, 16GB RAM, 1TB SSD).

This is a significant bump in hardware specs compared to the current solution, allowing us to run more builds simultaneously. But the biggest benefit is having access to a turnkey solution that provides ephemeral machines: build isolation is no longer a concern and restrictions on customizability can be lifted, making it possible to open macOS CI instance-wide on GNOME GitLab with minimal administrative oversight. This setup is located in MacStadium’s Dublin data center.

Thanks to MacStadium for sponsoring this infrastructure upgrade!

Thanks and Mentions:

  • Richard Littauer – for interfacing with MacStadium via calls / emails and active participation.
  • René de Hesselle – for actively taking part in all technical discussions.
  • Philip Withnall – for coordinating efforts within GNOME.
  • Bartłomiej Piotrowski – for setting up GNOME / MacStadium accounts.

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