systemd-environment-d-generator, 30-systemd-environment-d-generator — Load variables specified by environment.d
    
/usr/lib/systemd/user-environment-generators/30-systemd-environment-d-generator
systemd-environment-d-generator is a
    systemd.environment-generator(7)
    that reads environment configuration specified by
    environment.d(5)
    configuration files and passes it to the
    systemd(1)
    user manager instance.