Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By : Alex Gonzalez
Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By: Alex Gonzalez

Overview of this book

The Yocto Project has become the de facto distribution build framework for reliable and robust embedded systems with a reduced time to market.You'll get started by working on a build system where you set up Yocto, create a build directory, and learn how to debug it. Then, you'll explore everything about the BSP layer, from creating a custom layer to debugging device tree issues. In addition to this, you’ll learn how to add a new software layer, packages, data, scripts, and configuration files to your system. You will then cover topics based on application development, such as using the Software Development Kit and how to use the Yocto project in various development environments. Toward the end, you will learn how to debug, trace, and profile a running system. This second edition has been updated to include new content based on the latest Yocto release.
Table of Contents (13 chapters)
Title Page
Packt Upsell

Installing package installation scripts

The supported package formats, .rpm, .ipk, and .deb, support the addition of installation scripts that can be run at different times during a package installation process. In this recipe, we will see how to install them.

Getting ready

There are different types of installation script:

  • Pre-installation scripts (pkg_preinst): These are called before the package is unpacked
  • Post-installation scripts (pkg_postinst): These are called after the package is unpacked, and dependencies will be configured
  • Pre-removal scripts (pkg_prerm): These are called with installed or at least partially installed packages
  • Post-removal scripts (pkg_postrm): These are called after the package's files have been removed or replaced

How to do it...

An example snippet showing the installation of a pre-installation script in a recipe is as follows:

pkg_preinst_${PN} () { 
    # Shell commands 

All installation scripts work in the same way, with the exception that post-installation scripts...