# Over-The-Air Upgrade

The LAAs are kept up-to-date by the fleet management software as part of the
service.

In order to upgrade the LAA, Linaro is leveraging
[OSTree](https://ostreedev.github.io/ostree/) on top of a custom Yocto-based
OS.

## Features

By using OSTree, the LAA can provide OTA with:

* immune to power cuts during upgrade
* delta-upgrades
* secure boot
* automatic rollback on failures

## Process

When creating a new release, developers are pushing a tag to the
baklava-manifest repository with the right changelog.

[tuxsuite](https://docs.tuxsuite.com) is then leveraged to build the full Yocto
distribution. A gitlab job is then creating a new commit in the [LAA OStree
repository](https://ostree.lavacloud.io).

A new release and deployment are created into LMS with the right name and
changelog. Every targeted LAA will then automatically start to pull and deploy
the new release.

During the upgrade, the OLED displays the deployed version.