Embedded Linux Development Using Yocto Project Cookbook - Second Edition

How it works...

Once the recipe defines an installation script, the class for the specific package type will install it while following the packaging rules of the specific format.

For post-installation scripts, when running on the host, D is set to the destination directory, so the comparison test will fail. But D will be empty when running on the target.

Another common way to test whether a script is running on the device is:

if test -n "$D"; then 
  # Running on host 
else 
  # Running on target 
fi 

It is recommended to perform post-installation scripts on the host if possible, as we need to take into account that some root filesystems will be read-only and hence it would not be possible to perform some operations on the target.