native-search-paths and shepherd services (help wanted)

[Jonathan Frederickson]

Hi - I'm working on a Guix service for Minetest, and I'm running into some 
issues. The Guix package for Minetest is divided into two variables: "minetest" 
and "minetest-data", with only the former being an installable package. The 
Minetest package uses native-search-paths to allow Minetest to find additional 
available games (MINETEST_SUBGAME_PATH), *including* minetest_game which is 
effectively the default.

This is all well and good when you're installing Minetest as a package and 
running it manually, but I'd like to do this with a Guix service instead. 
Problem is... the native-search-paths don't seem to affect the environment 
variables set when I run Minetest through Shepherd. I'm checking my env vars by 
running Minetest through strace in the shepherd service at the moment:

      (start #~(make-forkexec-constructor
                (list #$(file-append strace "/bin/strace") "-s1024" "-vfe" 
"trace=execve" #$(file-append package "/bin/minetest")
                      "--server" "testworld"
                      "--map-dir" #$map-dir)
                #:user "minetest"
                #:group "minetest"))

(I've attached my current services/games.scm for reference.)

Is there a way for me to use the native-search-paths from the installed 
Minetest package when starting it through Shepherd?

games.scm
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