Site specific config for Spack

Usually the machine name is available in an environment variable like $SYSTEMNAME, $HPC_SYSTEM or equivalent to load local base configuration. The environment base spack.yaml then includes all files in the specific folder:

spack:
  include:
  - site-config/$SYSTEMNAME

You can check the overlay is working by

spack env activate .
spack config blame config

Some system specific entries should be governed by the site-specific envrionment config.