Are you an image vendor or a hobbyist looking to distribute your own custom Raspberry Pi OS image through Raspberry Pi Imager? If yes, then this guide is for you. In this post, we’ll take a deep, technical look at how Raspberry Pi Imager discovers and lists operating system images, and how the repository JSON format works under the hood.

With the release of Raspberry Pi Imager 2.0, a number of improvements have been made to the user interface, the imaging process, and internal configuration handling (for more details, see the Raspberry Pi Imager 2.0 announcement post). One of the more interesting changes is the updated JSON schema used to define available OS images. This update is particularly relevant to the introduction of cloud-init support in Raspberry Pi OS, including a new cc_raspberry_pi module that enables configuration features like enabling SPI automatically.

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