Exploring an image's contents

We have already seen how to use the build history feature to obtain a list of packages and files included in our image. In this recipe, we will explain how the root filesystem is built so that we are able to track its components.

Getting ready

When packages are built, they are classified inside the working directory of your project (tmp/work) according to their architecture. For example, on a wandboard-quad build, we find the following directories:

• all-poky-linux: This is used for architecture-independent packages
• cortexa9hf-vfp-neon-poky-linux-gnueabi: This is used for cortexa9, hard floating point packages
• wandboard_quad-poky-linux-gnueabi: This is used for machine-specific packages; in this case, wandboard-quad
• x86_64-linux: This is used for the packages that form the host sysroot

BitBake will build all the packages included in its dependency list inside its own directory.

How to do it...

To find the build directory for a given package, we can execute the following...