= meta-updater
:toc: macro
:toc-title:
:devguide-docsroot: https://docs.ota.here.com/ota-client/latest/
:getstarted-docsroot: https://docs.ota.here.com/getstarted/dev/

Meta-updater is a link:https://www.yoctoproject.org/software-overview/layers/[Yocto layer] that enables over-the-air updates (OTA) with https://github.com/ostreedev/ostree[OSTree] and https://github.com/advancedtelematic/aktualizr[Aktualizr] -- the default client for link:https://www.here.com/products/automotive/ota-technology[HERE OTA Connect].

https://github.com/ostreedev/ostree[OSTree] is a tool for atomic full file system upgrades with rollback capability. OSTree has several advantages over traditional dual-bank systems, but the most important one is that it minimizes network bandwidth and data storage footprint by sharing files with the same contents across file system deployments.

https://github.com/advancedtelematic/aktualizr[Aktualizr] implements https://uptane.github.io/uptane-standard/uptane-standard.html[Uptane], supports device authentication and provisioning, and is integrated with OSTree. You can connect aktualizr to your own server solution or sign up for a free account at https://connect.ota.here.com/[HERE OTA Connect] to get started.

== Quickstart

If you don't already have a Yocto project that you want to add OTA to, you can use the xref:{getstarted-docsroot}get-started.html[HERE OTA Connect Quickstart] project to rapidly get up and running on a xref:{getstarted-docsroot}raspberry-pi.html[Raspberry Pi] or with xref:{getstarted-docsroot}qemuvirtualbox.html[QEMU]. It takes a standard https://www.yoctoproject.org/tools-resources/projects/poky[poky] distribution, and adds OTA and OSTree capabilities.

== Dependencies

In addition to the link:https://www.yoctoproject.org/docs/current/ref-manual/ref-manual.html#required-packages-for-the-build-host[standard Yocto dependencies], meta-updater generally requires a few additional dependencies, depending on your use case and target platform. To install these additional packages on Debian/Ubuntu, run this:

....
sudo apt install cpu-checker default-jre parted
....

To build for https://github.com/advancedtelematic/meta-updater-minnowboard[Minnowboard] with GRUB, you will also need to install https://github.com/tianocore/tianocore.github.io/wiki/OVMF[TianoCore's ovmf] package on your host system. On Debian/Ubuntu, you can do so with this command:

....
sudo apt install ovmf
....

[discrete]
== Table of Contents

The following documentation focuses on tasks that involve the meta-updater layer. If you want to get an idea of the overall developer workflow in OTA Connect, see the link:{devguide-docsroot}index.html[OTA Connect Developer Guide].

* xref:{devguide-docsroot}supported-boards.html[Supported boards]
+
Find out if your board is supported and learn about the minimum hardware requirements.
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* xref:{devguide-docsroot}build-agl.html[Build an Automotive Grade Linux image]
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Learn how to use this layer as part of AGL.
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* xref:{devguide-docsroot}add-ota-functonality-existing-yocto-project.html[Add OTA functionality to an existing Yocto project]
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Learn how to add this layer to your own Yocto project.
+
* xref:{devguide-docsroot}build-configuration.html[SOTA-related variables in local.conf]
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Learn how to configure OTA-related functionality when building images, including how to install custom versions of aktualizr.
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* xref:{devguide-docsroot}recommended-clientconfig.html[Recommended configuration]
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Learn how to optimize your build for development or production.
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* xref:{devguide-docsroot}client-provisioning-methods.html[Provisoning methods]
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Learn more about the methods for provisioning devices. For more detail, you may also want to read about how to xref:{devguide-docsroot}enable-device-cred-provisioning.html[enable device credential provisioning] or how to xref:{devguide-docsroot}simulate-device-cred-provtest.html[simulate it for testing].
+
* xref:{devguide-docsroot}meta-updater-usage.html[Advanced usage]
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Learn about the `garage-push` and `garage-sign` utilities, aktualizr configuration recipes, and service resource control.
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* xref:{devguide-docsroot}meta-updater-testing.html[Testing with oe-selftest and ptest]
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Learn how to use the `oe-selftest` framework for quality assurance and how to run the aktualizr test suite via ptest.
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* xref:{devguide-docsroot}troubleshooting.html[Troubleshooting]
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Get help on common problems.

== License

This code is licensed under the link:COPYING.MIT[MIT license], a copy of which can be found in this repository. All code is copyright HERE Europe B.V., 2016-2020.

We require that contributors accept the terms of Linux Foundation's link:https://developercertificate.org/[Developer Certificate of Origin]. Please see the https://github.com/advancedtelematic/aktualizr/blob/master/CONTRIBUTING.md[contribution instructions of aktualizr] for more information.